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1. 67 Si Flash Magic NON PRODUCTION USE ONLY File ISP Options Tools Help LEE LA AAA Step 1 Communications LPC2378 Erase block 1 0007 000 0001 FFF Flash Bank el Erase block 2 Os002000 02002F FF Erase block 3 O04003000 04003FFF CUM Port CUM 7 Erase block 4 0x004000 0x004FFF Baud Fate 19200 Erase block 5 Ox005000 02005FFF ul Erase all Flazh Lode Ad Prot Interface None ISF lt None ISF lt Erase blocks used by Hex File Oscillator MHz 12 0 gt Step 3 Hex File Step 5 Start Gen block checksums Execute _ amp ctivate Flash Bank Technical on line articles about 8051 and XA programming WIA esacademy com Fag dacs To configure correctly make sure that the correct COM port is selected and that Baud Rate is correct The oscillator should be set to 12MHz which is what the boot loader selects for the default timing device 3 Select the correct Hex file The Hex file should be created once a build of the program is finished 4 Select the Start Button and the code should start downloading to the microcontroller 10 2 Keil IDE Emulator The Keil IDE is used for this project for software development and debugging The Keil IDE incorpor
2. 10 3 3 COM PORT and Batch File Configuration The createBatchFile function in the matlab code will create a batch file for the user Due to the fact that the compiler and arm tools may be located in a different location on one computer 72 than another the user must edit the function in order to user this to run the simulation This is done by locating the compiler on the computer This computer stores the compiler at C Keil ARM ARMCC bin This part of the function must be edited If no then the batch file will not compile the c program and the test will not run The drive will be found for the user but again the batch file must be located create a batch file function createBatchFile drive sprintf s rindDir cd drive batchFile fopen Graduate Project Data Loader Project Files Target 3 0 baL wrt I XGraduate Project Data Loader Project Files fprintf batchFile SET PATH C Keil ARM ARMCC bin C Windows system32 C Windows C Windows 5 fprintf batchFile SET CPU TYPE LPC2378 n fprintf batchFile SET CPU VENDOR NAP founded by Philips n fprintf batchFile SET UV2 TARGET Target 1 n fprintf batchFile SET CPU CLOCK 0x00B71B00 n fprintf batchFile C Feil ARM ARMCC bin ArmCc Via main i in fprintf batchFile C Keil ARM ARMCC bin ArmCC Via XXspi config i in fprintf batchFile C Keil ARM ARMCC bin ArmCC Via uart confi
3. AO BO BB sex 988 of 0 Note if the m file is not on the computer the GUI will not run The m file and all files associated with the system should be located somewhere on the Host Computer or you have the flash drive with the file 74 Information and Help Information will give software designer and Revision Info E cesse Help gives user option to open User s Manual Information Help CSUN Sat Electronic Power Supply and Sensor Emulator Update Plot Button updates Update Plot Mam Gu the design of the channel once the section has been created in Channel Select dropdown box will display the current design of that that channel COM port shows the com port connections between EPSSE Box and Host PC Setup Easy Config Box Channel 1 bl P New Section 0 Flash Port Directory ae e COM1 G Save Test Configuration Run Simulation Real Time Port Repeat COM1 Load Test Configuration View All A TT New Section Button starts a Run Simulation Button runs Save and Load Configuration section If continuous is a l new section in the design the simulation once all the buttons saves the current selected the test will channels are configured configuration or loads a continuously run if not the previously save configuration test will run for a number View All Button will produce a of durations set in the box
4. Figure 10 UpdatePlot_Callback 35 Figure 7 is just part of this callback but the rest of the switch is identical except for the return values and the handles which are created The Value of ChannelSelect will first be acquired and then based on that value the correct data will be plotted and saved to the correct handles For example if the Channel Select has a value of 1 indicating Channel 1 is selected once the Update Plot button is selected the nl and ul will be created and plotted The variable n1 is referring to the number of samples which will be taken if the duration is 2 seconds then the value of nl should be 10 2 due to a sample rate of 10Hz The function getDuration will grab data from all of the other GUI s Sine Wave Random and Slew if the data exist if not then this data is set to O If the data was not set to O then the function would not run and the sequence of operations would stop The variable ul is a vectored array of all the signals that are created Thus the reason for incrementing the New Section number returns n which is a length tserts the duraton of the plot function Duration getDuration appdata if isempty appdata Duration 0 else Duration appdata end Figure 11 getDuration Function 5 2 Sine Wave GUI Once the New Section push button is selected a question box will appear this box will prompt the user to select which type of wave form the user would like to design This is a
5. Table 1 Max Hours of Simulation per Channel 8 The max hours for each channel are shown in table 1 1 75 2 34 2 811 Sl 4 68 7 02 14 05 XTAL1 TMS TDI trace signals XTAL2 Vooev3 TRST TCK TDO RESET EXTIND DBGEN Vp a pi p 1PC2377178 SYSTEM o 32kB 512kB TEsT inDEBUGS Y FUNCTIONS iii SRAM FLASH INTERFACE E E 0 eS SET INTERNAL RC GPO INTERNAL 3 Nu OSCILLATOR joa PING CONTROLLERS wg ex 1 Ac E TOTAL T INTERRUPT MEMORY CONTROLLER CONTROLLER MASTER AHBTO SLAVE WITH PORT AHB BRIDGE PORT RAM AND DMA AHB TO APS BRIDGE I GP DMA CONTROLLER EINT3 to EINT pp pa EXTERNAL INTERRUPTS 2 GCAPD CAP1 nisi CAPTURE COMPARE 8 TIMERD TIMER 11 2 MATOVMATI MAT3 6 PUMA 2x PCAPI PD Pi 8 x ADD AID CONVERTER WATCHDOG TIMER SYSTEM CONTROL D Zamch74 Figure 2 NXP2378 Block Diagram 1 4 1 1 Serial Peripheral Interface SPI VREF Vosa Vas D 7 0 A 15 0 OE CSD C51 BLSD Veus 2xUSB DHUSB D 2 US6 CONNECT K 2 v USB UP LED K I23RX CLK I25TX CLK I25RX WS I25TX WS I25RX SDA I23TX SDA K SOCK SGKD MOSI MOSO MISO MIZO SSEL BELI SCK1 MOSIT MI501 EDSEL MCICLK MCIPWR MCICMD MCIDAT 3 0 TADO TXD2 TADS RXDO RXD2 RXDA TXD1 RXD1 DTR1 RTS1 DSR1 CTS1 DCDH RI RD1 RD2 TD TOZ SGLU SCL1 SCL2 SDAD SDA1
6. This step is repeated for the of Channels Data Sent back to Host PC over UART1 COM1 6 1 Startup Code Each time the microcontroller is reset the bootloader configures the NXP2378 for the In System Programming ISP or In Application Programming IAP For this project ISP is used and flash memory is programmed over the UARTO port This port is brought out on the board through the COMO port Once the bootloader program is finished the startup code is ran The startup code 1s a file that is included with the Keil IDE software The startup code file is LPC 2300 s This file can be used to setup the initial configuration of the NXP2378 The file is setup as to provide a configuration wizard which 42 allows the user to easily configure the NXP2378 The configuration wizard is a GUI like interface This file can be in C C or assembly Here is an example to illustrate UND Stack Size EQU 0x00000000 SVC Stack Size EQU Ox00000008 ABT Stack Size EQU 0x00000000 FIQ Stack Size EQU O22 00000000 IRQ Stack Size EQU 0x00000100 USR Stack Size EQU 0x00000400 Figure 16 Stack and Heap Configuration section in Startup file Expand Al Collapse All Help Show Grid Option V alue 7 Stack Configuration Stack Sizes in Bytes l Undefined Mode 00 sa Supervisor Mode 0x8 8 Abort Mode 0x0 Fast Interrupt Mode N Interrupt Mode 0x100 User System Mode 0x400 amp Heap Configuration Clock Setup E
7. SDA2 The SPI is a full duplex synchronous serial communication protocol Which means that data is sent out in sync with a clock and data can be sent to and from on the same bus As can be seen below the SCK is the master clock and depending on the configuration the data is clocked out on the rising or falling 8 edge of the SCK The Slave Select SSEL line is an active low line and must be asserted for the data to be received by the slave This serves as a sort of handshaking for the two devices 3 The SSEL line can be any signal which will can drive an output to be a low below 0 8V for CMOS and does not have to be the specific SSEL line designated in the memory mapped IO CPOL 0 CPHA 0 GPOL 0 CPHA 1 CPOL 1 CPHA 0 CPOL 1 CPHA 1 MISOMOS MSB 6 5 3 2 1 LSB Figure 3 SPI Protocol An SPI interface is configured using a master and a slave The master has the responsibility of providing the clock The SPI registers are memory mapped on the NXP2378 and communicate with the ARM7 microcontroller over the Advanced Peripheral Bus APB 4 1 1 1 Pin Description The SPI interface uses 4 pins for interfacing with the other device These pins are described in table 1 Serial Clock Clock sent out by the master if the NXP is configured as master SCK Input output orinput clock from device if NXP is configured as slave Slave Select The slave select line is a active low signal which is u
8. convert hex signal fprintf file 1n fprintf file Data Loader File n fprintf file char Signal d ch for i l length signal fprintf file 0Ox sis signal hex 1 1 signal hex i 2 end fprintf file in The function will call a function which is convert hex that will pass the variable signal and return the signal hex variable The purpose of this function is to convert the signal vector to a hex value which is what the DAC needs for a proper output Once the signal is returned the rest of the function creates a file and the signal array for each channel The control and code bits for each channel are hard coded 2411 converts the signal to a hex value 534 function signal hex convertHex signal 249 536 a quantizer ufixed 8 0 D N signal 256 5 25 38 Level 0 0343 539 N Level round N Level 540 Signal hex num2hex q N The convert hex function converts the value the value based on the transfer function of the AD7303 Equation 2 26 317 toggle button set if simulation will run continously 318 set the length 519 if get handles togglebuttonl Value 520 file fopen I Graduate Project Data Loader Signal Files define h w BT fprintf file define forever gag fprintf file 1n B3 fprintf file fdefine length d max lengths3 524 fclose file aAa else 926 file fopen I Graduate Project
9. handles n5 O sampleRate length 5 1000 sampleRate handles n6 O sampleRate length 6 1000 sampleRate handles n7 O sampleRate length T 1000 sampleRate handles n8 O sampleRate length amp 1000 sampleRate Figure 9 loadTestConfig Callback 5 1 7 Update Plot The Update Plot push button is located at the top left of the GUI 33 5 1 7 1 Function The Update Plot button will plot a matrix of u n on the y axis with n n on the x axis with n ranging from 1 to the number of channels The plot will depend on the selection of the Channel In programming language this is a switch statement with cases ranging from 1 to number of channels For Example if there are four channels then there are four different cases and the syntax in MATLAB is Switch variable Case 1 Implementation for variable 1 Case 2 Implementation for variable 2 Case 4 Implementation for variable 4 For this design the variable is Channel which is the value from the ChannelSelect handle This can be obtained from Channel get handles ChannelSelect Value This line of code uses the get function to grab a value in the handles structure Here handles is a structure of data for the call back The get function in MATLAB is similar to the get function using C in which the data is private and to access that data a function to get the data must be used This is a technique called 34 data hiding or data abstraction This is
10. Data Loader Signal FilesXderine h w 527 fprintf file define duration td n handles testDuration 52 8 G fprintf file define length d n max lengths a29 Eclose file tet Eh ioe end 531 932 build and download to Controller 5d Start LI Z 534 tmonitor the signals in real time 535 lrun Real Time Plot 936 The end of the code in this function will get the value of the togglebuttonl this is the continuous button The test will run until power is cut or there is some sort of fault The Total Test Input box will set the number of times through the set of signals The default is set to 1 Total Test 5 1 4 View AII View All is a push button which allows the user an option to observe all of the signals This can be of use when the user has created a signal but does not remember what the signal for a specific channel might be This can also give the user a representation of the signals once the design has been created 5 1 4 1 Function As stated in the introduction this feature simply plots all of the signals on one widget 27 5 1 4 2 Implementation To implement this code a simple subplot is created Executes on button press in ViewAll Zoshows a plot of all of the Channels which have been created function ViewAll_Callback hObject eventdata handles figure 1 subplot 4 2 1 plot handles n1 handles u1 title Channel 1 subplot 4 2 2 plot handles n2 handle
11. Emulator Once the emulator is up as you step through the code the SPI emulator will indicate the configuration of the SPI 69 1 PRR Ree RRR ERE EEE EERE EEE KK ERE RE RAEE RRA REE RE REE KK ERE 1 2 RE XK KK 2 Created by James Downs 3 Date 9 8 2013 a i E PEREA E ONERE SPI Serial Peripheral Interface cofiguration of the SPI interface 6 We E om E oA KKK EEE ERE ERE RE KKK KKK KK KK KK K K RE RE RE EEE EEE RE RE REE RE X xk x x od Control Register E o peviai ie SPIE Interrupt Enable AA SPCR 00820 LSBF LSB First B Date G MSTR Master g Ce REER RE RE EEE EEE RE RE KK KK K E Ek x x 4 R Bit Enable v M ter l 10 include lt LPC23xx H gt isha CRAT 10 4s E piTs 8 r CPHA Clock Phase 12 void SPI config OF Status Register 13 SPIF Data Transfer 14 PINSELO OxCO000050 WEOL Write Collision 15 PINSELO 0x00000033 SPSR 0 00 ROVR Read Overun 16 SOSPCR 0x0820 MODF Mode Fault 17 S0SPCCR 1 ABRT Slave Abort 18 e j Clock Counter 20 SPCCR 0 01 Master Clock 12000000 21 Slave Select SSEL Pin SPINT 0 00 SPI Interrupt Figure 38 SPI Configuration Emulator Validation As can be seen in figure 17 the SPI has been configured as the master with a master clock of 12MHz and an 8 bit write mode For a complete understanding of Keil IDE document xxx 70 10 3 EPSSE User s Manual The EPSSE is designed to emulate
12. Figure 33 Real Time Plot for Signal 1 60 8 Schematic 8 1 Simulator Box The simulator EPSSE simulator Box is a metal box that houses the electronics and the MCB2300 development board It was decided that the MCB2300 development board as opposed to designing a printed wiring board which contains the NXP2378 designed specifically for the purpose of this project would be a cheaper solution The MCB2300 provides more functionality than is needed but as stated before the design is cheaper and still serves the purpose DAC 7303 x 4 Decoder MCB 2300 Development Board Figure 34 Inside of Simulator Box Figure 30 shows the orientation and location of the development board and Electronics inside the EPSSE Simulator Box None of the electrical connections are shown and will be shown in the next section Both are mounted to the bottom of the box and the Electronics are mounted above the MCB2300 Development board by approximately and inch and a half 61 Power Start LED LED E C Front of EPSSE Simulator Box Real Time Data Signals and Ground Flash Programming Figure 35 EPSSE Simulator Box Front Panel The power connection is an open port and will not be sealed This is decided so that it can also serve as some ventilation for the components inside the box The temperature of the components is not anticipated to reach high temperatures so this is just a precaution The
13. O and Handshaking Rev 2 25 2013 http www ece uidaho edu ee classes ECE340 Lecture_Notes L20 LCDhandshaking pdf 4 MM74HC139 Data Sheet Fairchild Semiconductors Rev February 1999 5 MATLAB Creating Graphical User Interfaces The MathWorks Inc 3 Apple Hill Drive Natick MA 01760 2098 COPYRIGHT 2000 2013 by The MathWorks Inc 6 http en wikipedia org wiki Test_engineer 7 Reference to requirements specification for CSUNSatl Revision 1 1 8 MCB2300 v47 Schematic 02 20 2008 provide by Keil Tools by ARM ARM INC 4965 Preston Park Road Suite 650 Plano TX 75093 9 MAX563 Data Sheet MAXIM Integrated Products 120 Sab Gabriel Drive Sunnyvale CA 94086 66 Appendix 10 1 Downloading to Flash Memory The process to download to flash memory without using the batch file and the EPSSE GUI is outlines below 1 From the Keil IDE select the start flash magic icon File Edit View Project Flash Debug Peripherals Tools SVCS Window Oa HH amp 3 0 c e mm mm s S9 kj ES ue ES Target 1 I d Project A ES SPI config c 17 include lt math h gt iy Source Group 1 18 finclude lt stdio h gt ns LPC2300 s 19 include C XUsersVMJimmy E 20 finclude DART config c 1 Lp Ipc23wch Nu E 22 function protypes UU 23 void UART config void a ston 24 void sendData char signal AE Emmal ar d aT o Mundus dm adi IM m 2 The flash magic program will start
14. a feature that makes MATLAB so useful in that when this is created the Callback function automatically creates this structure and the get and set functions are built in to the library Once the case has been met then the implementation will clear the plot compute the sample rate and compute the signal The sample rate for this project was chosen to be 1KHz This should be more than enough to provide proper testing After the proper data has been created the data will be plotted saved and made available to the rest of the functions in the GUI The data is made available so that it may be plotted if a View All button is pressed or if the Channel Select is changed back to a channel that has already been designed 5 1 7 2 Implentation Switch Channel case 1 axes handles axesl cla sample rate 1 10 hMainGui getappdata 0 hMainGui Durationl getDuration getappdata hMainGui Duration 1 Duration getDuration getappdata hMainGui Duration 2 Durations getDuration getappdata hMainGui Duration 3 Duration getDuration getappdata hMainGui Duration 4 Duration Durationl Duration Durations Duration nl 0 sample rate Duration sample rate ul getappdata hMainGui Signal 1 getappdata hMainGui Signal 2 getappdata hMainGui Signal 3 getappdata hMainGui Signal 4 handles ul ul handles nl n1 guidata hObject handles plot handles nl handles ul
15. coded address which will cycle through the AD7303 s and the Enable line the decoder will only be enabled right before the serial data is being sent to the AD7303 device as advised in the AD7303 datasheet 2 The AD7303 architecture uses a shift register for the input control bits and data bits and an input register 16 DAC A BIAS DAC B BIAS O Yaun A 16 BIT SHIFT REGISTER C Neu B Figure 5 AD7303 Internal Logic 2 Figure 5 shows that the control bits will set the functionality of the device while the data bits flow dependent on the control bits DB15 MSB DEO LSB INT EXT X LDAC PDB PBA AB CRI CRO DB7 DB6 DBS DB DB DB2 DBI DBO A q AAA The input shift register contents indicate as stated before that the upper 8 bits are control bits and the lower 8 bits are data bits Bit 15 selects between internal or external reference For this project the internal reference is selected which is Vdd 2 Bit 14 is a don t care bit Bit 13 is a load DAC bit its purpose is to load the DAC registers for a synchronous update The PDB bit is a power down DAC B bit and PDA is a power down DAC A bit Neither are powered down during the simulation The A B bit is used to select between DAC A and DAC B and with CR1 and CRO really control how data is loaded into the DAC registers and how data 1s sent out of the device 17 Kad E GB G E E sc amp G a G a ceo sd U 0 0 l l l l x x to Both DAC regi
16. data The details of the Data Loader Software will be described in section 6 The EPSSE Main GUI is the first GUI which starts when the program is started This GUI provides the main screen for the user to design the simulation The design procedure is described in the User Manual section 9 3 Although different user s will configure different tests differently 20 CSUN Sat Electronic Power Supply and Sensor Emulator Update Plot Main GUI Setup Easy Config Box Channel 1 v New Section s Flash Port Directory COM3 Save Test Configuration Continous K Run Simulation Real Time Port Total Test COM6 Load Test Configuration View All Figure 6 EPSSE Main GUI 5 1 1 Channel Select The Channel Select is a dropdown menu which will select the current channel to display 5 1 1 1 Function Once a channel has been selected the display will display the current signal designed for that channel If the signal for that particular channel has not been designed the display will be empty 5 1 1 2 Implementation The following code creates the Channel Select Function Once the function is created the object string 1s set to display Channel 1 Channel 2 to Channel 8 This is implemented using the set function for that object Executes during object creation after setting all properties function ChannelSelect CreateFcn hObject eventdata handles 21 if ispc amp amp isequal g
17. ded esed oa ioa EE ao dod ie tuoi aede 17 te tre o EERSSE Mat CUL lt a 21 Fibu 7 Save CONT uration S 1 ii A a 30 Misure S save leste onne Callbacie ai deta sdadbenaeedaecaadadestauaddecandadeeaatattens 31 Proure 9 IoadTestC ontre CaM aC Eessen a da 33 Preure TO Update Plor Callback sra 35 Preure Tp set Duration Se Te sd 36 Pisu t Sine Maive Ou laa a N E De ud eom cL tu E DLE 37 Fisu 13s Sine Wave Example cia 38 Sr e 14 6 Siew Rate Eam ld 39 E1s re 15 Randolt Uk 40 Figure 16 Stack and Heap Configuration section in Startup file sese 43 Preure 17 CORDISUEQUOR Wiza deenen ls 43 Prune ES FOWO OO Qon ias deux sates cect at esuattutost tubus e onu ecoute cubre du SE eo LE USE o lua d 44 Fieure I9 SPI DUIS uino E vod rand EEE perdue EATE 45 Freure 20 S PI CODIIE TT 46 Fieure ZI sendoBits Blow Chart 22 tait acute as 48 Fieure 22 Send s DIS FUDCHOTG oisi dono ed ivo tues seul tas vase diste ea ibas N dicte D caer cue 48 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 35 Figure 36 Figure 37 Figure 38 UART configuration and functions HIG esse 49 send Data Function Flow Chatteris dE 50 Delay Function Prosta n dtr med eda te Dad eme cite com sa tme rectae ba deme sedeo edes 51 Mam Loop Flow Gri M 52 Mem Fone AA dd LE tele M LEM d 53 sendSienals Time Flow T uote ie teoeov aida 55 sen
18. ready overrun error parity error framing error break interrupt transmit holding register empty transmit empty and RX FIFO error Scratch Pad Register Readable and writable register Auto baud Control Register Used to control Auto Baud functions Fractional Divider Register Used to setup the baud rate Transmit Enable Register Enables a transmit of the FIFO data 12 RO WO RO WO RO R W OxE00 10000 OxE00 10000 OxE00 10000 DLAB 1 0xE0010004 DLAB 1 0xE0010004 DLAB 0 0xE0010008 0xE0010008 OxE00100C 0xE0010014 OxE001001C 0xE0010020 0xE0010028 0xE0010030 Table 4 UART 1 Configuration Registers 1 Notice that some registers are used for multiple purposes This should be a caveat for the programmer when configuring the UART 4 1 2 2 Baud Rate Calculation The baud rate is configured using equation 2 PCLK 1 2 DLM DLL Lp UART baudrate CLK 16 256 N N MulVal Equation 2 Baud rate Calculation 1 PCLK clock supplied to the UART DLM Divide bits upper DLL Divide bits lower AddV AL the numerator for a fractional divide value Mul Val the denominator for a fractional divide value 4 1 2 3 UART Pin Description RXD1 Input Serial Receive Data TXD1 Output Serial Transmit Data Table 5 UART Pins 1 4 1 3 Timer The NXP2378 contains four timers which can be used for different purposes For this project the Timer i
19. reset button will reset the NXP2378 and thus restart the test The start LED will indicate that the test has started the power LED indicates that power is supplied to the box The COM ports on the front of the box provide the flash programming and real time data 62 8 2 Electrical Connections EPSSE Simulator Box ARTE Pied DATA LOADER PWA Programmer Microcontroller UART1 Real Time Data Figure 36 Inter Connect Diagram DAC4 DAC3 DAC2 HOST PC DAC1 The electrical connections inside the box are indicated in figure 36 and tables 6 and 7 The MCB2300 development board will provide power and ground for the Electronics The Host PC will communicate to the EPSSE Simulator box over the two COM ports A DB15 Connector provides the signals out of the box PORT FUNCTION PORT LOAD Signal N A COMO Data COM Real Time Data USB Table 7 Host PC to Microcontroller 63 N l DECODER BITI Li i Gil P1 23 DATAIN SPIDATA IN PO 6 5 4 1 P1 20 CLOCK 7 4 9 DECODER 16 4 ENABLE ENABLE D id Table 8 Microcontroller to Electronics PWA 64 9 Conclusion To conclude the design was for a system to test that CSUNSatl main processor can meet the requirements step forth in the Requirements document 7 The goals are to give the user a user friendly GUI to configure the test
20. starting point The idea behind this is to give the user the ability to customize the test For example it may be desired to test the nominal case for a period of time and then for one minute or so go out of the nominal range For this reason three different types of waveforms can be selected as a starting point If a sine wave is selected then the Sine Wave GUI is opened 36 ID lt student Version Sine Wave 0 A r Sine Plot 2 1 i 1 0 8 0 6 0 4 I 0 0 2 0 4 0 6 0 8 1 Parameters Amplitude Frequency DC Duration Figure 12 Sine Wave GUI Observing figure 12 the Sine Wave GUI will open with a simple plot and parameters to customize the waveform The amplitude is half of the peak to peak value The frequency is in cycles per second the DC box provides a DC offset for the signal and the Duration is the duration of the signal in seconds To create the sine wave with a peak to peak amplitude of four a frequency of two and a DC offset of four for duration of one second Simply enter in the values 37 Sine Plot _ sss 8 5 4 2 0 l cal 1L Parameterg OOOO Amplitude Frequency DC Duration Z 4 1 Figure 13 Sine Wave Example As can be seen in figure 13 the plot is created and can be added
21. to the EPSSE GUI by selecting the Update Plot push button on the EPSSE GUI The sample rate for all signals is hard coded in the software to be 10Hz Once the signal is plotted the data array is sent to the EPSSE GUI by using the setappdata function in MATLAB 5 3 Slew GUI The same idea as the Sine Wave GUI is implemented in the Slew GUI As the name suggest this is a plot of a slew rate that can be set by the user simply by the y mx b Equation 4 Slew Rate Equation 38 M is the slope or slew rate of the signal in volts per second and b is the DC offset of the signal This can be seen from a formula of E Student Version Slew 0 7 0 8 0 9 Duration sec 1 Figure 14 Slew Rate Example As can be seen the signal starts at a 1 with a duration of 1 second and having a slope of 1 5 4 Random GUI As with the Sine Wave GUI and the Slew GUI the Random GUI is used to create a Random signal 39 0 1 0 2 Parameters Upper Limit Figure 15 Random GUI The upper limit is the upper limit on the randomness for example this Upper limit is 1 1 and the lower limit is 1 thus the values will range from 1 to 1 1 The duration is 1 second The random values are generated using a function which returns values that are Gaussian random distribution 40 6 Data Loader Software As stated in the Section 3 Overview once the design is configured in the GUI the software has to be downloaded to the microcontroller
22. 6 bits wide The first 8 bits are control bits while the last 8 bits are the data The SPI is configured first by setting the SPIO control register and setting the Clock counter register Of course the proper configuration of the pins using PINSELx registers should be set to configure the multiplexed pins on the NXP2378 The SPI is configured for 8 bits with no interrupts and set as the master The device will always act as the master for this project due to the fact that the AD7303 does not have the capability to write data back to the NXP2378 The clock counter is set to 6MHz The PCLK for the SPI is the set at 12MHz This is a clock rate of PCLK 8 which is under the required max clock rate of the AD7303 which is 30MHz It also fits the stipulation of a value of greater than 8 for a master Logic Analyzer Min Time Max Time Grid Zoom Min Max Update Screen Transition Jump to Signal Info Amplitude Save Os 19120225 01s i Out Al Auto Undo PT T T T Show Cyes E Cursor l 4 612386 s El zzh Pte ac r arm b la m L ente Anmshevor Figure 19 SPI Timing Firgure 19 shows that for a write to the 4 DACs twice each time a write occurs there is 16 bits of data written to each First the control bits and then the Data bits As can be seen the time is 10Hz or 0 1 seconds The MATLAB GUI calls for 10 samples per second This meets the design goal 3 The SPI protocol is set up in the SSPO peripheral on the NXP 237
23. 8 This peripheral can be set up as a SPI 4 wire SSI or microwire For this config file getters and setters are used and the SSPO or SSP1 defines are used to set this up Figure 18 shows the c file which contains the functions for setting and getting the SSP peripheral 45 29 void set55PControl int m SSPCRO int m 55PCR1 i 40 41 SSPOCRO m SSPCRO 42 SSPOCR1 m SSPCE1 13 44 Y 45 46 void send55PData int m Data t 47 46 SSPODR m Data 45 50 51 char getSsPStatus void L D2 33 return SSPO SER 54 29 56 27 2B m 60 61 62 63 64 65 66 67 68 69 70 void set5S5PClock char m Clock SSPOCPSR m Clock void SPIConfig fif defined S5P0 PINSEL3 OxOQOQO3CFOO0 set SS5PO PINS elif defined SSP1 PINSEL3 Ox0 fendit set55PControl OxQ0407 0x02 7 sert55PClock 2 Figure 20 SPI config c The send8bits function is used to send 8 bits of data two times consecutively First the MSB to bit 8 is sent as the control bits The SSP status register is polled to observe when the send data register is empty Polling was decided above using interrupts because in this situation an interrupt would take longer to service then to just poll the bit in the status register As can be seen in the code figure 22 there is no process of clearing the status bit this bit is self clearing 46 Start from sendSignalsForever or sendSignalsTime Set PO 4 Low Enable Deco
24. CALIFORNIA STATE UNIVERSITY NORTHRIDGE Electronic Power Supply and Sensor Emulator for the CSUNSatI A Project submitted in partial fulfillment of the requirements For the degree of Master of Science in Electrical Engineering By James Edward Downs II December 2013 The thesis of James Downs II is approved Dr Ichiro Hashimoto Date Professor James Flynn Date Dr Sharlene Katz Chair Date California State University Northridge List of Contents CALIFORNIA STATE UNIVERSITY NORTHRIDGE eere nennen nnne nnn i The thesis orJames DOWns Ilis approved iia aaa iia ii IPAS EOD Contents cete RID eI NC DIEM EM MIN INI ME MEME iii EG EI A A LIA UE V DSS Oy TADI atlas vii Listof Egua tiger viii Parody Lo TTT 1 PAM s Te INO TITO HHH 2 SX CL VIC iue 3 EMO e o e as em ET 6 A LINA 23758 MICKOCOMIFONGE ata od 6 A E s TH Peripheral Intertace Slate puias 8 A nase do sid Dalee s ema ia halen asa cca iol 9 4 LT1 2 COMM CULATION Ie OIS CRS conceit O AA A 10 A INCUN RR O 11 41 2 1 UARTT Configuration RE L i 11 4 12 2 Daud Rate ACU At OM a 13 ALS UART Pin Ea A15 odis oii t peo audi o di o id dau ae adu dou dud ei acu utes 13 AS VAMC i sae sessed c R 13 AL MAX 305 UART Controller lO 15 2 32 104 R T 15 AA Dieitalto A alos Converted AA A AAA 15 MATLAB OU ld 19 IEPS TTT 20 R Re A EN 21 S I I A ween aa ee aie uta ea in LO D cup aaa 21 ILE A Y 21 MANE E O ads 22 2 122 b Sre iot EEE a p
25. ERO da eta pb tiec lebat ee veered vases A EE 22 1 22 Implementado GS o eio ne Atul ot ios lene o a 22 O A Eis edhadmcu a femi ise ea 24 SM NS CUERO Co Omm 24 3 1 5 2 IipletientattOD eb eoe deb edem eb stb eheu Terr cue ase ien err cute 25 AME Dui cmt oo xS 27 5 1 4 TOC UOTE red 27 21 222 Ir plementabl D 565 eoe dto Ae poe An esM EE i IE 28 3415 Daves COMM SUTAUION ricino ica licita sselantu dis 29 SAA UN 30 A 30 O load CONO A 31 E e O a 32 2541 6 2 MPAA airlines 32 NI AA mcd Matta dod Asal le oe Ale al eto 33 STA EA A EWC ION HT 34 liz Ee ET Ta eta 35 LM Wave CIDT e ance dh RI ila E ca an is 36 xs Re t E O E T M RE E 38 R a Te E ER o dcm dudo Utd ds SEP 39 6 Data 0a umet IR Luc TL 41 SCAU pei m M 42 OC SPECODHPURICOD dedu entend o 44 0 5 ART Contrata AAA 48 OA Delay UNCON codes det dE dM MM MN eo eI 50 SPIRI TEES e a e NS 51 TIVDS TAB IR Ga time POL secreted a pad EE baideli bodie dieto pat Eti dato adit or fo Fat Ore d dat tese intu ids 58 HO CAMA AC 61 S RRIT DOX cipue outer adtet tM porca eed rite atento eae 61 3 2 blectticab C OMNC CONS sad 63 D CONC IS POM Nee 65 Refrenda A o 66 APPEAR 67 List of Figures Pieure I System Block K s io tectae eee diente sbvetat aine less E E A 5 Lieutre 2 NXP2579 Block Diagram lA 8 ISTR SPDPEOIOEOl T 9 Figure 4 5 Channel DAC contreuratiOn 2 T 16 LEioute 25 AD7505 Internal Lor Vat
26. MAM Setup E External Memory Controller Setup EMC G Figure 17 Configuration Wizard 43 Looking at figure 16 and figure 17 the highlighted box code corresponds to the configuration wizard in figure 17 Any change in the configuration will change the assembly code This is very useful for initially configuring such peripherals on startup like Clock Setup for the PLL If the reset button on the EPSSE Simulator box is pressed the microcontroller will reset and the simulation will start over from the beginning Observe the start LED to indicate the beginning of the simulation The delay for start of simulation is hardcoded at a delay of 5 seconds The startup code for the EPSSE Data Loader will be used to set the timing for the PCLK CCLK and power enable for peripherals The PCLK and CCLK are used to clock the peripherals on the NXP2378 6 2 SPI Configuration The Serial Peripheral Interface SPI is a communication protocol which will be used in this project to interface with the Digital to Analog Converter DAC The SPI will send data that was computed in the EPSSE GUI Compute Data in HEX Save file which contains an array of HEX data Send the Data over SPI to the DAC Figure 18 Flow of Data 44 As can be seen in figure 18 the SPI is responsible for transferring data to a device that can send out a voltage According to the AD7303 DAC data sheet data is clocked in to a shift register which is 1
27. a quick hit of the run simulation button will run the test for the user starts the download of the program to the uP function start loc findDir loc sprintf sGraduate Project Data Loader Project Files loc bat E sprintf tsGraduate Project Data Loader Project Files Target_ 3 0 bat loc cd loc2 that sprintf E XXGraduate Project Data Loader Project FilesXXTargetl bat 38 dos batj if s 0 msqgbox sprintf Download Successful Program is Running else msgbox sprintf Download Unsuccessful 73 10 3 4 Software Configuration 1 Open MATLAB on the Host Computer 2 Open the EPSSE GUI by entering run EPSSE in the command line in the MATLAB command window This can also be done by opening the EPSSE m file and clicking on the run button Student Version MATLAB 7 12 0 R2011a File Edit Debug Desktop Window Help r a E EN ge e Q m Ey o Current rm DAMyData Documents Documents Schoo CSUN Graduate Project MatlabXEPS Shortcuts Z Howto Add What s New Current Folder w O a x Student Version Command Window OO ax Li EPSSE Y P y W W New to MATLAB Watch this Video see Demos or read Getting Started x as a EDU gt gt run EPSSE EPSSE fig fg EDU gt gt Random fig fe Random m Real Time Plot fig fe Real_Time_Plot m e Sine Wave fig fe Sine_Wave m Slew fig fe Slew m Debug Desktop Window Help B A eo fI
28. abelColor ylabel Parent axesHandle4 5ignal Color labelColor title Parent axesHandle4j Channel 3 Color labelColor while isequal count loop voltagel count fread board 1 uint8 256 5 25 voltage count fread board 1 uint8 256 5 25 voltages count fread board 1 uint8 256 5 25 voltage count L fread board 1 uint8 256 5 25 voltages count fread board 1 uint8 256 5 25 voltage6 count fread board 1 uint8 256 5 25 voltage count fread board 1 uint8 256 5 25 voltages count L fread board 1 uint8 256 5 25 time count count set plotHandlel Y Data voltagel XData time set channel 1 Visible on datetick x 55 FFF set plotHandle Y Data voltage AData time set channel 2 Visible on datetick x 55 FFF The while loop will update the values for all the plots and then plot each in the appropriate figure The loop variable is set from passing the duration computed in the EPSSE MATLAB GUI This variable will be the duration of the longest signal 59 CSUN Sat Electronic Power Supply and Sensor Emulator Update Plot Main GUI Easy Config Box New Section guum Port Directory IA Continous COM3 Save Test Configuration Real Time Port Total Test COM3 Load Test Configuration View All Figure 32 Signal 1 Design plot in Main GUI
29. ate eight different sensors or eight different voltages or a combination of both Therefore to start a brief introduction as to what a sensor is or how to measure a physical characteristic is important A sensor is a transducer meaning a physical phenomenon is measured such as pressure temperature etc and converted into an electrical signal voltage or current This electrical signal will change based on a change in the physical phenomenon After the voltage is sampled and conditioned this voltage will indicate a measurement It is the duty of the electronic system to be able to condition sample and compute the measurement To validate any electronic design ensure it meets requirements a test system is built This is most likely part of the design process The idea behind test equipment is to simulate a voltage or current in order to validate the electronic system is working To validate this many elaborate test systems and stations have been developed and implemented The broadness of test system and cost of the test system is usually dependent on the requirements for the testing the system These requirements are usually stipulated by the customer The design of the test equipment is usually designed in parallel The need for test equipment has become so customary that a specific type of engineer Test engineer is one of the most sought out engineers in the field today This specialized Engineer is responsible for testing and validatin
30. ates an emulator in the IDE This is very useful in debugging code as will be demonstrated in the following example In this example the emulator is used to validate the SPI configuration by stepping through the main code 68 To start the build must be clean of errors and the debug mode must be selected Then from the tool bar select peripherals A drop down menu gives you the option to select any of the peripherals for this demonstration the SPI was selected Now as in figure 16 1 2 Created by James Downs 3 Date 9 8 2013 i h wk m o lad ig is E Db ec SPI Serial Peripheral Interface 2 cofiguration of the SPI interface E eee eee ee ee eee RAEE RARE EE RE RE RAEE E REE RE RRE EE ERE RE RAEE ERE ee Control Register SPIE int Enable jaj e l erupt En T Revisions NC SPCR i0000 LSBF LSB First E Date MSTR Master a EXEEREERERE Ck Ck oko KAAKA E E E E CE ECKE K K K RE K K EE EEE EEE EEE EEE K K K K K K E EO K A FP Bit Enable E E Master l 10 include LPC23xx H 16 gt O CPOLI dand EM im BITS 16 CPHA Clock Phase 12 void SPI config t 13 SPIF Data Transfer 3514 PINSELO 0xC0000050 WCOL Write Collision 15 PINSELO 0200000033 PSA ROVR Read Ovemun 16 SOSPCR 0x0820 MODF Mode Fault 17 SOSPCCR 1 ABRT Slave Abort 18 18 20 a Master Clock 46875 21 Slave Select FP SSEL Pin SPINT 0 00 SPI Interrupt Figure 37 SPI
31. ay 54 Figure 28 sendSignalsTime Flow Chart 131 sendS5ignalTime 132 time for the signal to run 133 void sendSignalsTime int time 134 i 135 int i 136 unsigned char signal 137 int end time 0 138 135 while end time time 140 i 141 for 1i 071 lt length i 142 i 143 144 Signal Signal 1 i 145 send Bits 3 signal 0 146 147 Signal Signal 2 i 148 send Bits 3 signal 1 149 150 Signal Signal 3 i 151 send8Bits 3 5ignal 2 152 153 Signal Signal 4 i 154 send8Bits 3 signal 3 155 156 Signal Signal S i 157 s3send8Bits 7 5ignal 0 158 158 Signal Signal 6 i 160 send8Bits 7 5ignal 1 161 162 Signal Signal 7 i 163 send Bits 7 signal 2 164 165 Signal Signal 8 i 166 send8Bits 7 signal 3 167 delay 100000 168 rend for 169 end _time 170 end while Figure 29 sendSignalsTime function 55 The sendSignalsForever function will run an endless loop Start Yes vlt No Send8bits Delay X8 Figure 30 sendSignalsForever Flow Chart 56 89 s0 51 92 93 g4 93 96 oT a8 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 3 2 4 23 26 2T 28 29 30 send5ignalForever Variables none void sendSignalsForever void i int i unsigned char signal while 1 for 1 0 i1 lt length i signal Signal 1l i send8Bits 0x03 signa
32. conjunction with the Save Configuration push button The user can load previously saved files once this button is pressed and use those previous configurations to quickly set up the test thus reducing the time to gather more important data 5 1 6 2 Implementation The loadTestConfig callback function will open a prompt with the uigetfile MATLAB function The file will be opened with read only permission A for loop is set up to set the length of each file by reading the first unsigned integer value The fseek function will go to the location of the first value and then fread will read all of the values and store each in an array signified by u I 32 t Executes on button press in loadTestConfig t Loads a dat file into the design function loadTestConfig Callback hObject eventdata handles sampleRate 1 1000 fileName uigetfile file fopen sprintf fileName r for i 1 6 length i fread file 1 uint32 fseek file sum 4 4 i bof u i fread file length 1 Single sum sumt length i end handles ul u 1 handles uz u 2 handles u3 u 3 handles u4 u 4 handles u5 u 5 handles u6 u 6 handles u7 u T7 handles u8 u 8 handles ni O sampleRate length 1 1000 sampleRate handles nz O sampleRate length 2 1000 sampleRate handles n3 O sampleRate length 3 1000 sampleRate handles n4 O sampleRate length 4 1000 sampleRate
33. crsz 4 4 scrsz 3 2 scrsz 4 4 secfrtopleft 1 scrsz 4 2 scrsz 4 4 scrsz 3 2 scrsz 4 4 thrfrtopleft 1 scrsz 4 3 scrsz 4 4 scrsz 3 2 scrsz 4 4 botleft 1 scrsz 4 4 scrsz 4 4 scrsz 3 2 scrsz 4 4 toprigth scrsz 4 scrsz 4 4 secfrtopright scrsz 4 2 scrsz 4 43 thrfrtopright scrsz 4 3 scrsz 4 4 botright scrsz 4 4 scrsz 4 4 wholeScrn 1 1 1 1 First all instruments are found and deleted as to not have any conflicts Then the serial port is opened all of the properties are set The COM port should be set according to the proper location The screen size is used to set the location of all of the plots as to make the code portable Each figure is configured to be aesthetically pleasing to the user AII labels and titles are also set This is somewhat of an initialization 58 26 25 30 31 32 33 a4 35 36 37 38 39 40 41 42 43 Saet up the figures channel 4 figure NumberTitle off Name Channel 4 Color 0 0 Visible orfrrf Position botlefr MenuBar none axesHandle4 axes Parent channel 4 YGrid on YColor 0 9275 0 9275 0 9275 EGrid on XColor 1 1 1 Color 0 0 0 hold on plotHandle4 plot axesHandle4 time voltage Marker LineWidth 1 Color 0 1 Oj xlim axesHandle24 min time max time 0 001 labelColor 1 1 0 xlabel Parent axesHandle4j Time Color l
34. d as to offer the user the most user friendly means of configuring a test or simulation 2 The values calculated and stored are meant to output values thru the electronics which would range from U to 5 25 volts 3 The values would be output at a rate of 10Hz or 1 sample every millisecond This is faster than the required sample rate 7 The max slew rate now set at 5 25V mSec 4 The test or simulation would be able to last long enough to test the ability of the processor to endure power loss during eclipse or loss of sunlight for some reason When the EPSSE is being utilized to test the CSUNSat1 the system configuration is that of figure The system consists of two major hardware components 1 A Personal Computer and 2 The EPSSE Simulator Box Inside the EPSSE box is all of the electronics hardware and interconnections The Host PC is where the user will configure the test simulation while the EPSSE Simulator Box contains the electronics needed to implement the simulation EPSSE Simulator Box AD7303 2 Channel DAC IC 74HC139 2 to 4 MCB2300 Decoder AD7303 2 Channel Development DAC IC Board NXP2378 Neues microcontroller pipes and COM Ports AD7303 Electronics 2 Channel DAC IC CSUNSat uController Figure 1 System Block Diagram 4 Electronics The Electronics is composed of a microcontroller NXP2378 contained on the MCB2300 development board A digital to analog converter DAC a decod
35. der OPINO codeBits amp 0x3 Set code bits with mask NO Check again Until Is the dat register is sthe data Eo gone from ns amp transmit Ox1 0 register Yes Send the control bits for the DAC sendSSP Data Refer to control section 4 4 figure 6 No Check again Until Isthe dat register is s the data gone from getSSPStatus amp empty transmit 0x1 0 register Yes h Pos dm S sendSSPData the DAC signall Send the data to the sendData signal UART Exit back to sendSignalsTime or endSignalsForever 47 TO 71 12 Ta T4 15 76 TT 78 TS 20 al a2 83 G4 25 36 87 as Figure 21 send8Bits Flow Chart fsend8Bits control bits and data bits for AD7303 code bits for the decoder void send8Bits unsigned char control unsigned char signal char code bits 1 IOCLRO 0x8 IOPINO code bits 0x3 assert sync ef while gertS5PStatus amp 0x01 0 L wait for the flag y H send5S5PData control write control data y while get55PStatus amp 0x01 0 4 wait for SPIF y H sendSSPData signal write the signal ef sendData signal Figure 22 Send 8 bits function 6 3 UART Configuration To plot real time data the UART1 is used to interface with the host PC The data sent out will be serial and sent out through the COM1 port The UART is configured to set 8 bits of data at a baud rate of 11584 The signal that is sent out of t
36. dicates that the SPI read buffer contains data that has not been read by the processor and new data has already arrived A write collision will indicate that a write to the SPI data register was done before 10 the data has been sent If the device is set as a master and the SSEL line goes low and is set as an SSEL line then a mode fault will occur stating that the device is configured as a master but another device is treating it as a slave SPI transfer complete will indicate that an SPI transfer has been completed This bit is used to check when new data should be inserted into the SPI data register The SPI Data register is a 16 bit register which contains transmit or receive data The upper 8 bits are the MSB s and the lower 8 bits are the LSB s Ifthe SPI is configured to send only 8 bits the lower 8 bits will contain the data sent The SPI Clock register controls the frequency of the master clock SCK and thus controls the frequency which data is sent out or received In the Master mode this must be an even number greater or equal to 8 This register along with the PCLK register will control the rate at which data is sent or received The SPI interrupt register can be used to generate an interrupt when a SPI transfer is complete or there is a mode fault Please refer to section 6 2 for the configuration for this project and the code which implements the configuration 4 1 2 UART The NXP2378 contains four UART interface
37. doienalsT re TUNIC HOD aid 55 send SienalsPoreyer Plow CAFE sese sese 56 send SienalsPorever FUNGON nicol 57 Signal T Dessen plot a Man GU cicatrices 60 Real Time Plot tor tonal lidia Resin bo s Ruedas 60 ERESSE Simulator Box FrontPadnelzu odds aid cialis ads stetur tet deud 62 Inter C onec E diciendo hoses tenir ieu 63 SPLEmulatot cne n uadit te a n auditu uter alta uM edit eee ae 69 SPI Configuration Emulator Validation see 70 vi List of Tables Table E SPLPinsDesen pao lla ded tp a Dade ee xo Pede fut spo oven 10 Table 2 SPI Resistors la aa 10 Table 3 UART 1 Configuration Registers liada ia 13 Table d UART PIS DE ntu ture hou i tunc hares RD ct RM DU AME RU McRae Ac ADEL 13 Table So Tuner Resisters EL si eub Ces UE e de Mose e QUEE 14 Table 7 Host PC to MICtOCODUDIIEE aaa 63 Tables Microcontroller to Electronics PWA au ipid iieri dada 64 vil List of Equations Equation d Baud tate Caleulauom lla dd oi Equati n 2 AD7303 Transter FUNCION aid A do Equation 3 Slew Rate Equation viii ABSTRACT Design of an Electronic Power Supply and Sensor Emulator for the CSUNSatI By James Edward Downs II Master of Science in Electrical Engineering A Cubesat is a miniature satellite which is launched into Low Earth Orbit and has become quite popular amongst hobbyist and institutions The size of the satellites and the complexity of the system as a whole make the projects very educational for students or any others
38. e signal files that are for the Data Loader software These are h files and are includes which contain information about the signals timing duration and parameters Second is to start the build process and download of the software into the microcontroller This will be done by starting a batch file which is 24 created and stored in the file system This file should not be modified Third is to start the real time plot in MATLAB which will plot the data in real time as the signals are being sent out to the electronics the signals are also being brought into the Host PC by way of UART which is sampled and plotted 5 1 3 2 Implementation 433 Executes on button press in RunSimulation 434 function RunSimulation Callback hObject eventdata handles 435 find longest signal 436 tpad zeros onto other signals 437 lengths length handles ul length handles u2 length handles u3 438 length handles u4 length handles u5 length handles u5 439 length handles u7 length handles u 440 441 handles ul handles ul zeros 1 max lengths length handles ul 442 handles u2 handles u2 zeros 1 max lengths length handles u2 443 handles u3 handles u3 zeros 1 max lengths length handles u3 did handles u4 handles u4 zeros 1 max lengths length handles u4 445 handles u5 handles u5 zeros 1 max lengths length handles us 445 handles u6 handl
39. ed guide figure 8 to design the GUI visually To implement a function simply drag and drop from the options on the left and then resize and position as desired Each time a widget pushbutton text box plot etc is created a callback function is created in an m file This m file can be edited to implement the functions and task which you would like the GUI to accomplish Once the design is finished then select the play button and the m file is created The GUI can be updated as desired by opening the fig file or editing the m file For a more complete tutorial on MATLAB guide and GUI design please refer to 5 19 ry untitled fig File Edit View Layout Tools Help OSe seO 4B Ed E IP Push Button acm Slider Radio Button TAT Static Text El Pop up Menu Toggle Button Emm 5 Button Group EX ActiveX Control Tag figurel Current Point 55 411 Position 520 380 560 420 Figure 7 MATLAB guide Blank figure 5 1 EPSSE The EPSSE GUI is responsible for creating the values that will be loaded into the NXP2378 microcontroller memory More specifically the values that will represent the voltages These are hex values ranging from 0 OV to 0x255 2Vref or Vdd As stated the GUI was designed in MATLAB and the goal of the software 1s to provide the user the ability to set up a test or simulation without exiting the GUI The Data Loader Software will serve the purpose of configuring the NXP2378 and sending the
40. er 4 AD7303 Analog Devices serial communication DAC s The microcontroller is an NXP2378 which utilizes the ARM7 architecture The MCB 2300 Development board contains various electronics 8 for programming the NXP2378 and for communicating with other devices Two COM ports have a UART communications protocol One of these ports can be used with a serial to USB cable to program the NXP2378 The MCB2300 board contains an IC MAX563 UART to serial converter IC 9 4 1 NXP 2378 Microcontroller The NXP2378 is an ARM7TDMI S microcontroller The NXP2378 contains several peripherals figure 2 but this paper will only cover in detail the peripherals and functions which are used Refer to the UM10211 NXP23xx User s Manual for all peripherals and configuration All peripherals are configured by setting bits in memory mapped registers Each memory location contains one byte The NXP2378 has memory allocation for flash programming of 512KB This accounts for 512KB of memory for the program and the data which makes up the signals sent to the electronics This was considered when deciding on the rate the values are sent to the CSUNSatl main processor Each value can be set at 8 bits but this will allow 512KB Program memory for the values The hex file is 6KB this leaves 506KB for the values That is 506 000 locations 506 000 60 seconds 60 minutes hours 8 channels 10 samples per second Equation 1 Equation for Allocation of memory
41. es u zeros 1 max lengths length handles u6 447 handles u7 handles u7 zeros 1 max lengths length handles u7 448 handles u8 handles u8 zeros 1 max lengths length handles u8 449 450 make the file 451 channel 1 ICl channel A code 00 1C1 control Ox3 channel A 452 file fopen I XGraduate Project Data Loader Signal Files signal l c W ani make file 1 file handles ul 454 felose file 455 When the code is run on the electronics it is important to set how long the simulation will run The length should be set to the longest signal created For example if a sine wave is created on channel that is 10 seconds and a random signal is created on channel 2 which is 5 seconds then the simulation should run for 10 seconds and then repeat or end This is the purpose of lines 437 to 448 The lengths of each signal will be put in a vector and then the max length will be put in a vector and then the max of that vector will be used to pad the other signals with zeros Then the code will first open a file and name that file Note this should be in the same location as the included c file in the Data Loader Software This is done for all channels The function make_file is used to make a c file with an array of values These values are the values that will be sent out on the serial data line to the DAC IC s 25 function make file ch file code control signal Signal hex
42. et hObject BackgroundColor get 0 defaultUicontrolBackgroundColor set hObject BackgroundColor white end set hObject String Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 5 1 2 New Section The New Section button is located to the right of the Channel Select dropdown menu and is a push button 5 1 2 1 Function The function of the New Section button is to call a dialog message this dialog message will prompt the user to choose what type Sine Wave Random Slew of new signal the next section or first section will be Once the button is pressed it will also increment the New Section number EY Student Version choice E 28 What type of Signal Sine Wave Slew 5 1 2 2 Implementation The NewSection Callback opens a question dialog and prompts the user to select A function was designed to set NewSection implementing a switch statement Depending on the statement selected a specific GUI will start which will give the user the options to select the parameters The NewSection data 22 is then set as an object to pass to the GUI which will be opened This is done with the setappdata MATLAB function Executes on button press in NewSection Jeopens dialog box and updates section number function NewSection_Callback hObject eventdata handles NewSection handles NewSection chioce questdlg What type of Signal cho
43. g i in fprintf batchFile C Feil ARM ARMCC bin ArmAsm Via lpe2300 igp in fprintf batchFile C Keil ARM ARMCC bin ArmCC Via sigqnal printf batchFile C Feil ARM ARMCC bin Armcc Via signal fprintf batchFile C Feil ARM ARMCC bin ArmCc Via gignal fprintf batchFile C Feil ARM ARMCC bin ArmCC Via signal printf batchFile C Feil ARM ARMCC bin ArmCc Via signal fprintf batchFile C Keil ARM ARMCC bin ArmCc Via XXsignal E FI un L S m FI An L Tin U 1 de 3 4 min qn ES Ts ie gj nm i un L fprintf batchFile C Keil ARM ARMCC bin ArmCc Via signal 7 Xn fprintf batchFile C Keil ARM ARMCC bin ArmCC Via signal 8 Vin fprintf batchFile C XXKeilXMARMXVXARMCCXXMbinXVArmLink Via Data Loader Rev A 1np in fprintf batchFile C Keil ARM ARMCC bin fromelf exe Data_ Loader Rev A axt i32combined outr fprintf batchFile FM f 3sGraduate Project Data Loader Project Files flagshemds txt drive Another method would be to build the data_loader project file and create a batch file edit that batch file to run the flashcmds txt by adding FM correct path Then in the start function edit it so that bat is that file and location It will save much more time to initially set up the createBatchFile and therefore
44. g electronic components and designs 6 Test equipment software and companies are now some of the biggest employers of young engineers and LABVIEW a common test equipment software and hardware company equipment of some sort is in almost every engineering company s lab or office 3 Overview The requirements for the EPSSE are derived from the Requirements for CSUNSatl Revision 1 1 The JPL experiment section 3 2 10 requires that the CSUNSatl main processor shall use temperature current or voltage data from the experiment to control the timings connections charging magnitudes and discharging magnitudes of the experiment Section 3 2 11 states the main processor shall protect the space craft from experiment faults The main processor shall sample the voltages as a rate of 1Hz which may vary between 0 5V 0 1V There will be six voltages The EPSSE is a device which is composed of electronics for creating voltage and current simulation a GUI which allows the user to configure the desired simulation and the software which serves the purpose of loading the electronics with the files configured in the GUI The EPSSE simulator box will provide eight channels or signals and thus the GUI will involve configuring these 8 channels The EPSSE GUI was designed to test the CSUNSat1 s ability to meet the requirements in the Requirements for CSUNSatl Revision 1 1 document The four design goals are as follows 1 The EPSSE GUI is designe
45. gle fwrite saveFile length handles u4 uint32 fwrite saveFile handles ud single Iwrite saveFile length handles u5 uint32 fwrite saveFile handles u5 single fwrite saveFile length handles u6 uint32 fwrite saveFile handles u o single Iwrite saveFile length handles u7 uint32 fwrite saveFile handles uT7T single fwrite saveFile length handles u8 uint32 fwrite saveFile handles u8 single fclose saveFile Figure 8 saveTestConfig Callback 5 1 6 Load Configuration The Load Configuration push button will prompt the user to load a dat file which was created before and saved 31 f Select File to Open Lookin L EPSSE ef Ed T Recent Flaces Name T EPSSE EPSSE E getAvailableComPort E portTest Random Random Real Time Plot T Real Time Plot realPlot Sine Wave Sine_Wave E Slew E Slew Date modified 10 31 2013 3 38 AM 11 5 2013 7 57 PM 10 31 2013 3 05 AM 11 3 2013 7 50 PM 9 24 2013 9 30 PM 10 22 2013 12 58 9 28 2013 4 41 PM 11 1 2013 1 17 AM 11 5 2013 7 37 PM 9 28 2013 2 42 PM 10 22 2013 12 58 9 2 2013 10 36 PM 10 22 2013 12 58 Type MATLAB Figure MATLAB Code MATLAB Code MATLAB Code MATLAB Figure MATLAB Code MATLAB Figure MATLAB Code MATLAB Code MATLAB Figure MATLAB Code MATLAB Figure MATLAB Code File name Files of type Al MATLAB files 5 1 6 1 Function This is used in
46. gure 7 Save Configuration Prompt The file should be saved as a dat file 5 1 5 1 Function The function of this push button is to give the user a way to configure a test without designing all of the signals again if for some reason the test has been aborted or some other issue arises 5 1 5 2 Implementation To implement this function the MATLAB functions uiputfile fwrite fopen and fclose are used Uiputfile is a function that will open the user input prompt for the user to save the file and in a specific location The fwrite function writes data to a dat or bin file dependent upon the user Fopen and fclose functions simpliy open and close documents in the Host PC fopen is used to open the file with writer permission only This is done so that no data is somehow read from the file The fwrite in this case first will write the length of the signal to the file as an unsigned integer uint32 and then write the rest of the data as a 64 bit floating point number single 30 t Executes on button press in saveTestConfig t saves design to FileName function saveTestConfig Callback hObject eventdata handles FileName PathName uiputfile saveFile fopen FileName w fwrite saveFile length handles ul uint32 fwrite saveFile handles ul single fwrite saveFile length handles u2 uint32 fwrite saveFile handles u2 single fwrite saveFile length handles u3 uint32 fwrite saveFile handles u3 sin
47. he SPI is the same that is sent to the UART Transmit holding register This will be the data captured by the host PC 48 17 lH void UARTConfigi t 18 19 PINSELO Ox1 lt lt 30 20 PINSEL1 Oxi 21 ULLCR 0x80 22 UlDLL Ox4 23 UlDLM OF 24 UlLCR OxBB 25 UlFCR 37 26 UlFDR 0x85 27 UITER 0x80 28 UlLCR Ox B 2 30 31 32 char getUARTStatus 33 return UIlLSE 31 39 236 void sendData unsigned char signal 37 38 while qetUARTStatus amp m THRE 1 au Z 40 41 UITER 0x00 42 UIlTHE signal 43 UITER 0x80 44 45 46 Figure 23 UART configuration and functions file The file simply sets the proper pins on the microcontroller then sets the baud rate according to the baud rate calculation given in section 4 4 2 2 and has a function that will poll the Line Status Register bits for transmission and then set the value that is passed in the function The Transmit bit is set low before entering the data in the Transmit holding register and this will how the data from being transferred to the Transmit shift register 49 Start from send8Bits Is the transmit FIFO empty getUARTStatus If THRE bit is set THRE mask 02 in LSR then empty Send the data to the transmit U1THR signal FIFO Exit back to send8Bits Figure 24 sendData Function Flow Chart 6 4 Delay Function The delay function is used to set the output rate of the signal To
48. ice Sine Wave Slew Random Random NewSection setNewSection chioce NewSection handles NewSection NewSection set handles SectionNumber String NewSection guidata hObject handles make data avaiable for Section Plot GUI hMainGui getappdata 0 hMainGu1 setappdata hMainGui NewSection NewSection JosetNewSection set the new section GUI based on the user input if a new plot is created then increment NewSection Number else keep it the same function NewSection setNewSection x NewSection switch x case Sine Wave 23 run Sine Wave NewSection NewSection 1 case Slew run Slew NewSection NewSection 1 case Random run Random NewSection NewSection 1 otherwise NewSection NewSection end In MATLAB the Switch or Case statement syntax is different from C an Otherwise is used to set the default condition As can be seen if the user selects any of the options then the NewSection variable will be updated if not then the default condition is to leave the variable as it was before This is important because the variable NewSection is used to pass arguments back and forth between the GUT s 5 1 3 Run Simulation The Run Simulation is a push button which should be used once the final signal for all channels has been created 5 1 3 1 Function The function of Run Simulation is to do run three main tasks The first is to create or update all of th
49. in order to run the test The software that sets up all of the peripherals and imports the files and values has the project name Data_Loader The software s main function is to import the values which configure the test hence the name Data_Loader The software is written in the C programming language with a function based approach The software is written so that a continuous flow of data is sent out to the Electronics and sent back to the Host PC for real time data plotting The flow diagram below indicates the flow of data during a simulation As can be seen once the data is stored on the microcontroller in program memory non volatile then the data is sent out to the electronics then sent back to the Host PC this will repeat for the number of channels The that loop will repeat for the duration set in the EPSSE GUI or run forever if that is set in the EPSSE GUI This is controlled using ifdef directives in the software Special consideration was taken so that the data would be sent out abiding by the timing which is set in the MATLAB GUI Another word the actual signals voltage levels and timing should match what was designed in the GUI 41 Data is configured in Matlab Data Stored Locally on Host PC in respective Files Signal_N for N 1 to Hof Chamels Data Sent to the NXP23 78 over UARTO COMO Data Sent out on SPI Bus to Electronics Board This step is repeated for the Duration of the test setin EPSSE GUI
50. l 0 Signal Signal 2 i send8Bits 0x3 signal 1 Signal Signal 3 i send8Bits 0x3 signal 2 Signal Signal 4 i send8Bits 0x3 signal 3 Signal Signal 5 i send8Bits 0x7 signal 0 Signal Signal 6 i send8Bits 0x7 signal 1 Signal Signal 7 i send8Bits 0x7 signal 2 Signal Signal 8 i send8Bits 7 signal 3 delay 100000 l end for fend while t end function Figure 31 sendSignalsForever Function 57 7 MATLAB Real time Plot The MATLAB real time plot is a real time plot of the simulation data which is sent to the CSUNSAatl main processor This is done over a serial to USB connection from the EPSSE simulator box to the Host PC The NXP2378 utilizes the UART1 communications terminal to send data to the Host PC The script is a based on the real time data plot from a serial port by Moidu Thavot The script first sets up eight plots which will fill the screen These plots are then updated every 100 milliseconds Which is the rate of output of the DAC IC s These values are then converted back and plotted delete instrfindall board serial COMS baudrate 115834 parity odd InputBurfer 8 fopen board tset the time interval to grab data timestep 0 1 tset the number of times to grab data 3 loop 50 voltage 0 voltage O time clock time clock scersz get 0 Screen5Size tlocations topleft 1 scrsz 4 s
51. pture event occurs CR1 Capture Register 1 RO EMR External match registers Controls the external R W match pins CTCR Count Control Register Selection between timer or R W counter operation Table 6 Timer Registers 1 The timer does have pins for external match and capture functions but due to the fact that the timer is being used as a delay the pins are not configured and thus not used 14 4 2 MAX 563 UART Controller In order for the NXP2378 to communicate through UART a UART controller is needed The MAXS53 contains 2 RS 232 drivers and 2 RS 232 receivers This makes it ideal for the two UART ports which will be used 1 for the programmer and 1 for the UART real time data sent to the host PC This UART controller is present on the MCB2370 development board 4 3 2 to 4 Decoder A simple 2 to 4 decoder is used as a chip select for the four different DAC IC s This will create 8 channels The decoder is a 74HC139 2 to 4 decoder 4 This decoder is an active low output So a 0000 will set the 1 output low and all others high a 0001 will set the 2 output low and all others high This decoder is used as the select line SSEL for the four DAC s which is an active low enable Therefore to enable the DACI a 0000 is sent to the decoder through GPIO pins on the NXP2378 Along with this and the two channels on the DAC s it provides five channels 4 4 Digital to Analog Converter For this project a DAC IC is used to send out
52. r Limit and Lower Limit will set the upper and lower bounds of randomness the Duration will as in all of the plots set the duration of this section The randomness is a Gaussian random value between the upper and lower limit 75 b the sine wave GUI provides inputs for amplitude frequency DC level and duration The equation is set as Amplitude sin 2 pi frequency DC level 76 c the slew plot equation is mx b 77 DS 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 Parameters Upper Limit Lower Limit Duralion sec 4 1 1 1 This signal 1s a random signal which has values ranging from 1 to 1 1 for a duration of 1 second Once the signal is created the user can update the main GUI plot by selecting the update plot button As can be seen the plot is now updated with the signal To add another signal stay on the same channel and select the New Section button again A new question box will appear again and the user can select the type of signal desired Now repeat the step 6 and choose the parameters for this signal Each time a new section is selected that section will be concatenated onto the previous There 1s no limit to the amount of new sections This allows the user the ability to configure many combinations a specific signal profiles as desired 78 CSUN Sat Electronic Power Supply and Sensor Emulator Main GUI man M er cece i p Port Directory Da Contino
53. r designing a GUI based test system is due to the recent popularity of visually based test equipment and the idea of carrying out long exhaustive test on a system that may take much longer to configure than to actually run the test The GUI was designed in MATLAB and the electronics involve a microcontroller a digital to analog converter and miscellaneous components The end product is essentially a programmable arbitrary waveform generator 1 Introduction This report is a description of the Electronic Power Supply and Sensor Emulator EPSSE test system designed to test the CSUNSat1 functionality The report will give a background of test equipment which will be followed by an in depth description of the EPSSE Then followed by a tutorial on how to use the EPSSE This report can serve as a user s manual or design report Traditionally test equipment is made per the design The purpose of any test equipment is to test the functionality of the design The main functions of the CSUNSAatl is to a survive in low earth orbit LEO b monitor the voltage and current levels of the payload and c transfer that information down to mission control CSUN campus The EPSSE will test the CSUNSat1 s capability to measure the voltage and current levels of the payload Before moving on it should be stated that when referring to a GUI action Select left mouse click of push button 2 Background This test system will have the capability to simul
54. r the other dependent on the selection during the design There is a delay for the LED to signal the beginning of the Test This LED will be present and labeled on the outside of the EPSSE Simulator box 51 Start Initialize the clock memory and Periphials Delay for 5 seconds Turn on Run LED Configure the SPI Configure the UART Run continuous Test Ye sendSignalForever No sendSignalsTime Figure 26 Main Loop Flow Chart 52 38 main 40 Flt 41 startDelay duration 42 IODIRO 0Ox1FF 43 IOCLRO 0x8 amp amp OXF 44 55PContfig 45 DARTConfig 46 4ifdeft forever 47 sendSignalsForever 48 Ffelse 9 sendS5ignalsTime duration 50 endif 51 52 Figure 27 Main Function The main function calls functions which are included in the file Once of those is the sendSignalsForever and the other is sendSignalsTime The sendSignalsTime function is ran in the program if the user has not checked the Continuous Radio Button in the EPSSE MATLAB GUI The duration is the variable that is passed to the function and is set as a default of 1 Length is set in the EPSSE MATLAB GUI as the max of all of the signal vectors thus the inner loop of the program will cycle until the last value of the longest signal configured in the EPSSE MATLAB GUI 53 Endtime 0 Endtime time Ye Turn off Run LED Enditme endtime 1 No Send8bits X8 Del
55. reen by holding down the number on the keyboard Once the number key is released the view all plot will be displayed as it was before The user can choose to save the test configuration The configuration should be saved as a dat file which can be stored in the user s desired location If the user has previously saved a configuration then the load configuration button will allow the user to load the dat file Once all of the channels have been configured then the user should decide if the test will run for a set duration of time or if the test should run continuously This is done simply by selecting the continuous push button If the continuous push button is not selected then the test will run for the duration of the longest signal profile In the repeat box the user can set the amount of times to repeat The real time plot radio button will give the user the option to run a real time plot of the signals as they are being sent out of the EPSSE box Once all of the test configurations are finished to start the test select the Run Simulation button and the test should begin A pop up box should appear indicating all of the files have been created successfully and that the program is now running The real time plot will appear on the screen if the user selected the real time plot radio button 81 The Signal Files have been Created Succestully 82
56. s One of the UART interfaces is needed for download of application code if JTAG is not used Refer to section 9 1 for instructions of application code download UARTI will be utilized in this project for sending real time data to the Host PC The host PC will contain a program which will plot in real time the data being sent to the CSUNSatl processor This will provide the user the ability to validate and observe the response the CSUNSatl will have to the simulation 4 1 2 1 UART 1 Configuration Registers The NXP2378 contains fourteen registers for each of the four UART interfaces The UARTI registers which are used for this project are described in table 3 11 RBR THR DLL DLM TER IIR FCR LCR LSR SCR ACR FDR TER Receiver Buffer Register Contains 8 bits of data Transmit Holding Register Contains 8 bits of write data Divisor Latch 8 Least significant bits of divisor latch Used to divide the PCLK for setting the desired Baud Rate See Section 4 1 2 3 Setting Baud Rate Divisor Latch 8 most significant bits of divisor latch Interrupt Enable Register Enables the Auto Baud time out interrupt Interrupt ID Register FIFO Control Register Reset the RX or RX FIFO and enable FIFO Line Control Register Used to configure the word length select 1 or 2 stop bits enable parity select parity type break control and divisor latch bit access Line Status Register Indicates a Receiver data
57. s u2 title Channel 2 subplot 4 2 3 plot handles n3 handles u3 title Channel 35 subplot 4 2 4 plot handles n4 handles u4 title Channel 4 subplot 4 2 5 plot handles n5 handles u5 title Channel 55 28 subplot 4 2 6 plot handles n6 handles u6 title Channel 67 subplot 4 2 7 plot handles n7 handles u7 title Channel 7 subplot 4 2 8 plot handles n8 handles u8 title Channel 8 5 1 5 Save Configuration The save configuration is a button that will save the current test configuration Once the button is selected then a pop up will prompt the user to save the file and in the desired location Save in EPSSE E ey E Ti 2 a Recent Places Desktop J EPSSE EPSSE ra getAvailableComPort portTest Random Random Real Time Plot Real Time Plot realPlot E Sine Wave Sine Wave J Slew Slew File name config 1 dat an MATLAB files Save as type Date modified 10 31 2013 3 38 AM 11 5 2013 5 33 PM 10 31 2013 3 05 AM 11 3 2013 7 50 PM 9 24 2013 9 30 PM 10 22 2013 12 58 9 28 2013 4 41 PM 11 1 2013 1 17 AM 11 5 2013 7 37 PM 9 28 2013 2 42 PM 10 22 2013 12 58 9 2 2013 10 36 PM 10 22 2013 12 58 29 Type MATLAB Figure MATLAB Code MATLAB Code MATLAB Code MATLAB Figure MATLAB Code MATLAB Figure MATLAB Code MATLAB Code MATLAB Figure MATLAB Code MATLAB Figure MATLAB Code Y Fi
58. s utilized to implement a delay The timer can be configured using the memory mapped registers outlined in Table 5 The Timer is a 32 bit counter and each of the four match registers per timer can be configured to cause an interrupt The timer also contains external match registers which can be enabled to 13 set low set high or toggle upon a match condition Please refer to section 6 4 for the application code which implements a delay for this project Name Descriptoin Access IR Interrupt Register Using the VIC a write to the R W will clear the interrupt flag This register can also be read if polling is being used TCR Timer Counter Register The TCR is used to control R W the timer functions TC Timer Counter 32 bit register which increments R W every PR 1 cycle of the PCLK PR Prescale Register When the PC is equal to this R W value the TC is incremented and the PC is reset PC The Prescale Counter is a 32 bit value which R W increments on the PCLK MCR Match Control Register Used to control if an R W interrupt is generated when the TC matches a MR MRO Match Register O Stores value which the TC will R W match and genrate and interrupt reseet TC stop Timer or do nothing MR1 Match Register 1 R W MR2 Match Register 2 R W MR3 Match Register 3 R W CCR Capture Control Register Controls which edges of R W the capture inputs are used to load the capture registers CRO Capture Register 0 Loaded with the value of TC RO when a ca
59. sed to SSEL Input select a device for communication Master In Slave Out If NXP is configured as master then this is the input MISO Input Output from the slave device If the NXP is aslave this is the oupt Master Out Slave In If NXP is configred as master this is the output MOSI Input Output if NXP is aslave this is the input Table 2 SPI Pin Description 1 Note here that the SSEL line is an input and this is because if the device is set as a slave this line will be an input As stated before if this line is an output then it can be used as a SSEL line but does not have to be set to that in the PINSELx register 4 1 1 2 Configuration Registers The NXP2378 has five configuration registers table 2 SSPxCRO SSP control registerO R W Ox EQO68000 SSpxCR1 SSP control register 1 R W Ox E0068004 SSPXSR SSP Status register RO Ox E0068008 SSPXDR SSP Data Register R W OxEOO6800C SSPxCPSR SSP Clock counter register R W 0xE0068010 Table 3 SPI Registers 1 The SPI control registers configures the operation of the SPI The SPI can be configured to send anywhere from 8 bits in a single write up to 16 bits The clock phase and polarity can be set to determine the relationship between the data being sent out and the clock The SPI can send LSB first or MSB first and interrupts can be enabled with the control register as well The Status Register is used to check the status of the transmission of receive operations A read overrun in
60. send the data at the correct voltage levels at a rate which the main processor should be able to sample the data This was accomplished using MATLAB to design a user friendly GUI Writing software which would send values to the electronics at a rate as to meet the sample rate the CSUNSatl main processor will sample data Implementing an electronics design to output the correct voltage to test the limits of the CSUNSAatl main processor Designing the system memory to store enough values to run a test duration which would test the limits of the CSUNSatl main processor The results show that the EPSSE can output voltages between OV to 5 25V The rate the values change is 10Hz The total duration per channel used is stated in table 1 The GUI was designed for the user to save and load configurations therefore cutting down on setup time Designed to give the user the option to create a combination of signals to perform many different test The EPSSE GUI gives the user the ability to monitor the data in real time to track any time at which an anomaly occurs and the user can view all of the simulation plots at once In conclusion the EPSSE GUI was designed with the user in mind 65 References 1 UM10211 NXP2378 USER s MANUAL REV 4 1 September 5 2012 Copyright NXP B V 2012 2 AD7303 Data Analog Devices Sheet One Technology Way P O Box 9106 Norwood MA 02062 9106 U S A Fax 617 326 8703 Analog Devices Inc 199 3 Processor I
61. set up a delay the Timer on the NXP2378 is used This delay function takes an integer variable and creates a delay which is the value of that integer The delay function simply configures the Timer O registers and runs a while loop until the Timer O interrupt flag is not set then clears the flag and resets the Timer 50 fee eK ERE KEKE KEKE KK KKK KKK KN KK KKK NK NK KN K XK KKK K KKK KKK KKK RE RE RE KKK NK KX Function delay variables time sets the delay time in uSec LRAZAZAZZZLLLLLZZLLLLLZZLZLLIZZZLZLZLZLZZLLZLLLLLZZLZLZZLLZZZLLZZZZLZZIZZLIZLZZLZZILLLZZLLLLLLS void delay int time i TOTCR 0x2 reset the IC y TOPR Ox0B prescale register f TOPC 0x00 Prescale counter TOMRO time F matchO register f TOMCR 0x03 gt control register int reset stop y TOTCR 0x1 enable the IC while TOIR 0 f TOIR Oxi TOTCR 0x03 Figure 25 Delay Function C Program 6 5 Main The main function is used to configure all of the peripherals and use the functions to send data to the DAC The SPI and UART are configured and then a function to send the data out is ran This function will send the data to the DAC for the duration of the simulation The simulation can be ran for the duration of the signal designed in the EPSSE GUI or can run continuously until the reset button is pressed or the power is disconnected Line 59 through 63 implement an ifdef else endif which will run one o
62. sters loaded from shift register Update DAC A input register from shift register Update DAC B input register from shift register Update DAC A DAC register from input register Update DAC B DAC register from input register Update DAC A DAC register from shift register Update DAC B DAC register from shift register Load DAC A input register from shift register and update both DAC A and DAC B DAC registers Load DAC B input register from shift register and update both DAC A and DAC B DAC registers outputs Figure 6 AD7303 Truth Table 2 As can be seen in figure 6there are a number of combinations For this project if DAC A is to be used then the Control bits are set to 0x3 which will set DAC A DAC register to be updated from the shift register and then the data will be sent out immediately For DAC B 0x7 will do the same and thus is what is configured in the software 18 5 MATLAB GUI The GUI for this project was designed in MATLAB This is due to a couple of reasons none taking precedence over the other 1 MATLAB is a familiar tool for most of the current Electrical Engineering students If this project is to be modified at any time in the future the tools would be available 2 MATLAB tools for creating a GUI are intuitive and the built in functions included in the library allow less of a learning curve 3 MATLAB s popularity is the reason for a bevy of information and tutorials MATLAB uses what is call
63. subplot of all of the channels 0 D eee e i Bc 3 The MATLAB GUI shown above should open The COM Port box in the upper right hand corner will indicate which com ports the flash port and the real time port are connected to From the Main GUI the user can view each channel one by one by flipping through the channel select dropdown box To configure a simulation the first thing to decide is which channel to configure For example if the user has connected channel to a port on the CubeSat main processor then channel can be configured by the following steps 4 To start the design of the test select the New Section button This will open a new question box which will prompt the user to select a type signal What tupe of Signal Sine Wave 5 Depending on the selection a new GUI will open all of the GUI s have similarities a plot but differ in the input parameters Note All signals are digital and thus produce a digital signal at a rate of one value per millisecond All signal parameters are initially set to O All signals must be set between 0 and 5 30 to comply with the Vref supplied to the DAC If any of the signals are set outside this area an error message will appear and the signal will not be plotted or created 74 Se eee a B R Pat A a Ee ULLA 9 3 Ob BH E Far m wc EEE To lH E ii C 1 Rae Aut F T T e Be 6 Next choose the parameters for the signal a for the Random Plot the Uppe
64. the power supply and the sensors for the CSUNSat1 Cubesat This user s manual will serve as a guide for a Providing the connection instructions b 10 3 1 Hardware Items The following items are needed and should be used for the connection and use of the EPSSE 1 EPSSE Simulator Box TBD Figure 1 EPSSE Simulator Box 2 2 Serial to USB cables 1 for flash programming and 1 for UART real time data 3 Wall power plug or computer power cord with DC power input plug 4 Personal Computer Workstation or any type of Computer 71 5 Flash drive with software of software files located on the computer 10 3 2 Hardware Configuration To set up a test or simulation follow these steps 1 First of all the connections between the EPSSE simulator box and the Host computer must be made As well as the connection to the CSUNSatl processor 2 First connect the USB to serial cable into the front of the EPSSE simulator box The connection is a DB9 connector which is labeled Flash Program and USB to computer 3 Next connect the USB to serial cable into the front of the EPSSE simulator box the connection 1s a DB9 connector labeled Real Time Data Serial Side to box and USB to computer 4 Connect the power cord to the EPSSE simulator box 5 Connect all cables to USB ports on the computer 6 Ifdone correctly the Power LED on the box should be lit and the COM port on the Computer should recognize the EPSSE simulator box
65. us COM3 Save Test Configuration Real Time Port Total Test COM6 Load Test Configuration View All Notice the New Section edit text box has now incremented This will indicate how many signal sections are in work for this channel 9 Once all of the sections are finished the next channel can be set up This is done by selecting the Channel in the Channel Select drop down box 79 CSUN Sat Electronic Power Supply and Sensor Emulator Main GUI man M er cece p Port Directory dd cd Continous COM3 Save Test Configuration Run Simulation Real Time Port Total Test COM6 Load Test Configuration View All Notice the New Section box has been reset to 0 If for any reason you need to look at any of the channel profiles simply select 1t from the dropdown menu and the signal will be displayed on the Main GUI plot again Also if at any time the user would like to view all of the signals then select the View All push button 80 10 11 12 13 14 Channel 1 Channel 2 0 0 1 0 2 0 3 04 05 0 6 07 Channel 3 Channel 4 1 0 8 0 6 0 4 0 2 0 0 2 0 4 0 6 0 8 1 y 0 8 0 6 0 4 0 2 0 02 04 Channel 5 Channel 6 1 T T T L AA T T T T 1 T T T U W T T A 0 8 0 6 0 4 0 2 0 0 2 04 0 6 0 8 1 E 0 8 0 6 0 4 0 2 0 0 2 0 4 Channel 7 Channel 8 Each channel will be shown as above The user can explode a subplot to take up the whole sc
66. voltages which can then be interpreted by the CSUNSAatl main processor These voltages as stated in the overview section represent the data the microcontroller would be receiving during its mission duration The DAC IC is an Analog Devices AD7303 2 This is a 2 channel DAC which is a full scale DAC which is capable of communication through SPI protocol The shift register is 16 bits wide which are used to configure and set the output of each channel The transfer function of the DAC 1s as follows Vout 2 Vref out ref Ez Equation 3 AD7303 Transfer Function Where N is an eight bit hex value For example If Vref is set to Vdd 2 selected as internal reference 15 Vout 2 2 5 7 5 2 2 5 With 5V for Vdd the max output is 5V The AD7303 datasheet sets the max Vdd as 5 5V Which will indicate that the max output of the AD7303 is 5 5V For this project four AD7303 s will be utilized to set up an eight channel configuration The reference voltage will be selected as the internal reference and thus Vdd will be set to provide the CSUNSatl main processor with the required voltage range stipulated in the requirements document The Vdd will be supplied from the NXP2378 and will be 5 25 volts This will provide the ability to output the voltage range specified in the initial design goals 2 Figure 4 8 Channel DAC configuration 2 As can be seen the SCLK and Data lines will all be the same the only difference is the
67. who wish to further their knowledge in engineering The CSUNSAatl is a Cubesat project taken on by California State University Northridge CSUN in collaboration with Jet Propulsion Laboratories JPL The Electronic Power Supply and Sensor Emulator EPSSE serves the purpose of testing the CSUNSatI system during the development stages For example testing what would happen if for some reason the CubeSat processor loses power for an amount of time or the temperature rises to a certain limit how would the software be able to handle this problem and what would be the result To test the CSUNSAatl the voltage or current levels of a temperature or power supply must be simulated Testing of electronic systems has in the past been accomplished using traditional tools like function generators To test the CSUNSatl a system has to be designed in order to simulate more than one signal and should be easily configured by the user The EPSSE is a Graphical User s Interface GUI designed in software and electronics which serve the purpose of realizing the user s test profile created in the GUI The goal is to design a GUI which gives the user an easy method of configuring a test while offering the capability to fully test the CSUNSatl microcontroller s software The CSUNSatl microcontroller software will be responsible for monitoring the currents and voltages of the power supply various sensors and the batteries under test The reason fo

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