AN1924 Application Note
Contents
1. Mode Byte Name Description B3 Mask Key Presses Displays all key presses as asterisks on LCD B4 Auto Backlight Turns backlight On with any key press then turns backlight Off 4 seconds after last key press B7 Delayed Response Provides a 3 0ms delay in response to a command Required for interfacing with BS2 Table A 3 LCD Control Codes Conirol Total Bytes Needed Return Code Function Command_Data Data Ctrl A Cursor Home 1 Byte 0x01 None Ctrl B Set Adjust Backlight Brightness 2 Bytes 0x02 0 255 None Ctrl C Set Adjust Contrast 2 Bytes 0x03 0 255 None Ctrl D Hide Cursor 1 Byte 0x04 None Ctrl E Underline Cursor 1 Byte 0x05 None Ctrl F Block Cursor 1 Byte 0x06 None Ctrl G Sound Bell Buzzer 1 Byte 0x07 None Ctrl H Backspace 1 Byte 0x08 None Ctrl l Horizontal Tab 1 Byte 0x09 None Ctrl J Line Feed 1 Byte 0x0a None Ctrl K Reverse Line Feed 1 Byte 0x0b None Ctrl L Form Feed Clear Screen 1 Byte 0x0c None Ctrl M Carriage Return 1 Byte 0x0d None Ctrl N Backlight On 1 Byte 0x0e None Ctrl O Backlight Off 1 Byte 0x0f None Ctrl P Set Cursor Position 2 Bytes 0x10 0 79 None Ctrl Q Clear Column 1 Bytes 0x11 None Ctrl R Set Relays 2 Bytes 0x12 0 255 None Ctrl S Define Custom Character 10 Bytes 0x13 0 7 8 Bytes None Ctrl T Download Keypad Tags 17 Bytes 0x14 16 New keys None Interfacing LCDs and Porting Code For More Information On This Product2. Wordl6 dg aies static Word32 sum static Word32 Vcount static Word32 BaroPress BAdj SpiParams bSetAsMaster 1 SPIO is set as master SpiParams pSlaveSelect NULL GPIO Pin 5 used for SS SpiParams pSlaveDeselect NULL SpiParams TransmissionSize 16 Size of transmission Open SPIO port SerialMaster NAME open BSP_DEVICE SPI_0O 0 amp SpiParams Open SCI for LCD and keypad devices SciConfig SciCntl SCI_CNTL_WORD_ 8BIT SCI_CNTL_PARITY_NONE SCI_CNTL_TX_ SciConfig SciHiBit SCI_HTBIT_0s SciConfig BaudRate Interfacing LCDs and Porting Code INVERTED SCI_BAUD_19200 A MOTOROLA For More Information On This Product Go to www freescale com A MOTOROLA Freescale Semiconductor Inc Converting SDK Based Code SciFD open BSP_DEVICE_NAME_SCI_1 0 amp SciConfig loctl SciFD SCI_DATAFORMAT_EIGHTBITCHARS NULL Set bit clock rate ioctl SerialMaster SPI_BAUDRATE_DIVIDER_32 NULL SS can be left low between successive SPI bytes ioctl SerialMaster SPI_CLOCK_PHASE_NOTSET NULL TLC2543 is commanded to use analog input 8 Output data length 16 bits Output data format MSB first unsigned integer ADcmd TLC2543_port_8 TLC2543_data_16 TLC2543_MSB_ first TLC2543_ Unipolar Display demo title
3. Go to www freescale com A MOTOROLA ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 ARCHES EF ELSE CENRUREOETER Sn 2005 etMedia s Serial LCD ARCH Viable A 3 p LED ControkGades ipUCTOR INC 2005 Control Total Bytes Needed Return Code Function Command_Data Data Ctrl U Set Baud Rate 2 Bytes 0x15 0 6 None Ctrl V Read ADC Inputs 2 Bytes 0x16 1 8 2 Bytes Ctrl W Change Bell Buzzer Frequency 2 Bytes 0x17 0 255 None Ctrl X Set Keypad Modes 2 Bytes 0x18 0 255 None Ctrl Y Read Keypad Input as Port 1 Byte 0x19 1 Byte Ctrl Z Get LCD EEPROM Settings 1 Byte 0x20 20 Bytes None Display Custom Character 1 Byte 0x80 None AX MOTOROLA Interfacing LCDs and Porting Code 19 For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcikveeseale Semiconductor Inc 2005 ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 OnCE is a registered trademark of Motorola Inc Motorola reserves the right to make changes without further notice to any products herein Motorola makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Motorola assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation consequential or incidental damages Typical
4. parameters which may be provided in Motorola data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts Motorola does not convey any license under its patent rights nor the rights of others Motorola products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur Should Buyer purchase or use Motorola products for any such unintended or unauthorized application Buyer shall indemnify and hold Motorola and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part Motorola and are registered trademarks of Motorola Inc Motorola Inc is an Equal Opportunity Affirmative Action Employer How to reach us USA EUROPE Locations Not Listed Motorola Literature Distribution P O Box 540
5. Jumper JPA must be soldered closed However the throughput of the LCD s SPI port is very slow Fox max 8 kHz and SPI ports on the DSP56F80x family are incapable of such slow speed without extraordinary manipulation of the DSP chip s clocking rate Therefore interface as an RS 232 device is recommended These are the features of the 634 e RS 232 interface 1200 2400 4800 and 9600 Baud e DB9 connector provided for a simple RS 232 hookup e Available with bright even software adjustable LED backlighting or in a low power reflective model e Available as either 20x4 Model 634 or 16x2 Model 632 display e Software controlled contrast e Gapless horizontal contrast e Software controlled terminal style automatic scrolling and line wrapping e Unique Scrolling Marquees feature continuously scrolls a message across the display without host intervention e Low speed SPI and Inverted TTL RS 232 for embedded application e Buffered communication e Low power Non backlight operation will self power from the DTR and RTS lines of most serial ports A microcontroller is built into the LCD s support and a ROM stores the necessary code for its operation Further information is available from Crystalfontz s web site www crystalfontz com Figure 3 shows the 634 s display on power up Figure 3 Crystalfontz s 634 Intelligent Serial LCD Module Display 3 2 NetMedia s LCD Serial LCD Module NetMedi
6. com Adjust LCD s Backlight level Adjust LCD s Display contrast UWord16 NewScr 2 12 0 Clear Screen on LCD UWord16 BackLightOn 2 14 0 Turn on LCD s Backlight UWord16 LightLevel 2 2 70 Set back light level here set to 70 UWord16 DispContrast 2 3 100 Set display contrast here set to 100 UWord16 DispKeypad 2 24 1 beep with each key press A MOTOROLA ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 onverting SDK Based Code ARCHES EF AEESERN GENRE RBOET RSC 2005 write SciFD bstriARCHiVED BS AR ESCALE SEMICONDUCTOR INC 2005 read SciFD ginput 1 Display some numbers on display write SciFD NewScr 1 strepy bstring Input at key 0000 to exit n write SciFD bstring strlen bstring strcepy bstring Hit key to start strcat bstring LF write SciFD bstring strlen bstring write SciFD NewScr 1 The following loop polls keypad input until 0000 is input Keypad entries are displayed on both LCD and in IDE s text window while true read SciFD amp inputarray ii 1 if inputarray ii CR 0 inputarray ii 0 sprintf bstring Input s n inputarray write SciFD bstring strlen bstring ii 0 else write SciFD amp inputarray ii 1 Litt if stremp inputarray 0000 0 break write SciFD NewScr 1 strcpy bstring Do
7. in millibars the following expression uses 32 bit arithmetic and 10 bit left on all coefficients equation scaled for millibars anda 12 bit ADC is P 0 271267 Vcount 105 56 Equation taken from MPX4115A Tech Data sheet BaroPress 278 Vcount 108093 gt gt 10 BaroPress BAdj PosCursor 1 42 Set Cursor position in LCD write SciFD PosCursor 2 Send result to LCD sprintf astring P ld mbars BaroPress j write SciFD astring strlen astring close SerialMaster This procedure is called when it is determined that the user desires to enter a correction term to the barometric pressure measurement to compensate fo the altitude above sea level of the sensor It is expected that the user will provide the pressure adjustment in millibars void BaroAdj int SciFD Word32 padj 14 char astring Baro Height Adj n char bstring Enter mb char iarray 8 int icount temp i tenpow write SciFD NewScr 1 PosCursor 1 22 write SciFD PosCursor 2 write SciFD astring strlen astring PosCursor 1 42 write SciFD PosCursor 2 write SciFD bstring strlen bstring icount 0 while true read SciFD amp iarray icount 1 Interfacing LCDs and Porting Code O MOTOROLA For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcikveeseale Semi
8. 16 temp Set up parameter for SCI port 8 bit no parity TX_inverted SciConfig SciCntl SCI_CNTL_WORD_8BIT SCI_CNTL_PARITY_NONE SCI_CNTL_TX_INVERTED SCI_HIBIT_0 SCI_BAUD_9600 Set Baud rate to 9600 SciConfig SciHiBit SciConfig BaudRate Open SCI Serial Device SciFD open BSP_DEVICE_NAME_SCI_1 1 amp SciConfig Configure SCI1 to work with eight bit characters loctl SciFD SCI_DATAFORMAT_EIGHTBITCHARS NULL write SciFD NewScr 1 Wipe clean LCD s Display Start for ever loop for write SciFD NewScr 1 Wipe clean LCD s Display write SciFD aastring strlen aastring Write Demo title write SciFD bstring strlen bstring Interfacing LCDs and Porting Code A MOTOROLA For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcifveeseale Semiconductor Inc 2005 Interfacing the LCDs to the DSP56F805 Display some ARBHIVED S AREFSCALE SEMICONDUCTOR INC 2005 nanosleep amp FiveSeconds NULL Wait five seconds write SciFD NewScr 1 Wipe clean LCD s Display for I 0 I lt 29 I Write some numbers to LCD sprintf astring Sd I write SciFD astring strlen astring nanosleep amp FiveSeconds NULL Wait five seconds write SciFD NewScr 1 Wipe clean LCD s Displ
9. 5 Denver Colorado 80217 1 303 675 2140 or 1 800 441 2447 JAPAN Motorola Japan Ltd SPS Technical Information Center 3 20 1 Minami Azabu Minato ku Tokyo 106 8573 Japan 81 3 3440 3569 ASIA PACIFIC Motorola Semiconductors H K Ltd Silicon Harbour Centre 2 Dai King Street Tai Po Industrial Estate Tao Po N T Hong Kong 852 26668334 Technical Information Center 1 800 521 6274 HOME PAGE http motorola com semiconductors dsp MOTOROLA HOME PAGE hittp motorola com semiconductors AA MOTOROLA AN1924 D For More Information On This Product Go to www freescale com
10. Freescale Semiconductor Inc MOTOROLA Order by AN1924 D Semiconductor Application Note Motorola Order Number Rev 0 4 2001 Interfacing Serial LCDs to Contents a DSP56F805 s SCI and A ee i Porting Code Using the EE A gt Embedded SDK 3 Descriptions of the Intelligent LCD Modules cccccceeeeeeee 3 Joseph R Pasek 3 1 Crystalfontz s 634 Intelligent Serial LCD Module 000065 4 3 2 NetMedia s LCD Serial LCD Modules nanninannan na 5 S l Introduction a 4 Interfacing the LCDs to the DSPS6F805 ceeeeeeeeceeeeeeeees 5 4 1 Connecting the 634 LCD to the This application follows an earlier application note Some General DSP568xx Interface Examples using the Embedded SDK AN1921 D that focused on interfacing DSPS56P805 ccsssssssssssssssssssssssssssenee 5 the DSP56824 with an LCD keypad and an SPI based 4 2 Software for the 634 LCD and the device an 11 channel 12 bit A D converter TLC2543 That DSP56F805 ccccscsssessesecesetseeceversens 6 note described interfacing via the SPI port either directly or 4 3 Connecting the LCD to the with the MAX3100 chip that converts SPI signals to a DDS PSG ESOS innean 7 4 4 Software for the LCD and the m compatible RS 232 format r DSPSGF805 ieissar 8 H This note will show the relative ease of interfacing either NetMedia s LCD including a keypad or Crystalfontz s 634 5 Converting SDK Based Code 10 In
11. PEESERMGENRURBBETERGN c 2005 tMedia s Serial LCD A 3 Power Input ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 The power input section consists of four through holes Solder pads The two holes marked GND are grounds The hole marked 5 5V to 15V is tied to the onboard regulator of the LCD module The hole marked 5V ties to the 5V bus and is used to bypass the LCD s onboard regulator when a regulated 5V source is supplied A 4 ADC Inputs The eight ADC inputs are labeled 1 8 By default all ADC inputs are set to read voltage in the 0 to 5V range A 5 Relay Driver Outputs There are nine Relay Driver connections Labeled on the underside of the board as R1 8 and RLY_VDC The connections labeled R1 8 are the relay driver chip outputs the RLY VDC connection provides access to the ULN2803A driver chip s internal back EMF protection diodes A 6 Matrix KeyPad Input The keypad input connections visible in Figure A 1 are the upper most eight of the 8x2 header connection The lower eight of the 8x2 header connection which are not visible in Figure A 1 are used by the factory for programming and should be left unconnected A 7 Interfacing the LCD The LCD can be controlled using any computer or microprocessor supporting 1200 57600 baud data rates with an 8 N 1 data format 8 data bits No parity 1 stop bit A 8 Keypad Interface The keypad interface supports matrix keypads up to 4x4 in size 16 keys Instead o
12. a s intelligent LCD was featured in the application note General DSP568xx Interface Examples Using the Embedded SDK AN1921 D The LCD comes with a 20x4 display and a built in port capable of supporting a keypad up to 4x4 in size It supports an RS 232 interface that can work at either normal or TTL voltage levels 4 Interfacing LCDs and Porting Code O MOTOROLA For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcikveeseale Semiconductor Inc 2005 Interfacing the LCDs to the DSP56F805 Among the features of AREAMED BY FREESCALE SEMICONDUCTOR INC 2005 e Serial I O RS 232 or Inverted TTL 2400 to 57600 Baud 8 N 1 e Keypad input 4x4 matrix type e Power requirements 5V to 15V DC at 9mA 200mA maximum with the backlight on e LCD type 4x20 Supertwist e Analog to Digital Converters a bank of 10 with 10 bit resolution e Relay Drivers e FlashROM Although the LCD may offer more than needed for this effort other applications may require some of its features The LCD has its own microcontroller and software in ROM to implement its features An example of its display is shown in Figure 4 r TTT TIT Figure 4 Example of NetMedia s LCD display See Appendix A for additional details about the LCD 4 Interfacing the LCDs to the DSP56F805 This section explains how to connect each LCD to the DSP56F805 device and contains code examples demonstrating the
13. ay temp A for I 0 I lt 26 I Write capital letters to LCD sprintf astring Sc temptt write SciFD astring strlen astring temp a for I 0 I lt 26 I Write small letters to LCD sprintf astring Sc temptt write SciFD astring strlen astring nanosleep amp FiveSeconds NULL Wait five seconds 4 3 Connecting the LCD to the DSP56F805 In AN1921 D the LCD device was interfaced to one of the DSP56824 s SPI ports using the Maxim MAX3100 UART chip s bi directional capability to convert data conveyed by an SPI port to an RS 232 format However the DSP56F80x s SCI port can be connected directly to an RS 232 device using the TTL voltage option compatible with NetMedia s LCD making additional hardware unnecessary The LCD has a much faster processor and the ability to support baud rates up to 57600 It also provides support for a 4x4 matrix keypad which allos user input resulting in two way communication between the LCD and the DSP56F805 4 4 Software for the LCD and the DSP56F805 The software is written in C and makes full use of the SCI support provided in the Embedded SDK Code Example 2 demonstrates the interface between the DSP56F805 and NetMedia s LCD serial display AX MOTOROLA Interfacing LCDs and Porting Code 7 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc Interfacing the LCD
14. conductor Inc 2005 Conclusions ARCHIVED BY FREESCALE SEWHEONDUCTOR INC Aude iarray icount gt iarray icount lt write SciFD amp iarray icount 1 icount iarray icount 0 sscanf iarray Sd amp temp padj Word32 temp 6 Conclusions This application note was written to describe the interface capabilities of the Motorola DSP56F80x It has shown that by using the higher order C language and the facilities provided by the Embedded SDK a user can easily interface a serial based intelligent LCD with a built in keypad support to the processor s SCI port without additional hardware The code examples demonstrated that with one brand of LCD serial module bi directional communication was established and maintained effectively 7 A MOTOROLA and reliably Additionally the software program IntFaceBaro c generated for the DSP56824 in Application Note AN1921 D was converted quickly and efficiently to operate the serial LCD and keypad and an SPI based analog to digital converter was interfaced to an absolute atmospheric pressure sensor from a DSP56F805 Most of the code remained the same changes were required only to the code that controlled the SCI and SPI ports me Le References Some General DSP568xx Interface Examples using the Embedded SDK AN1921 D DSP5680x User s Manual DSP56F801 7UM D DSP56F805 Evaluation Module Hardware User s Manual DSP56F805EVMUM D Embedded SDK So
15. d SDK are shown in Code Example 6 Interfacing LCDs and Porting Code O MOTOROLA For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 ARCHES EF MEESERN GENRE RBOET ERAN c 2005 onverting SDK Based Code Code Example 5 Original SDKi Goede for DSP56824 s SRIO RortoNDUCTOR INC 2005 SpiParams bSetAsMaster 1 SPIO is set as master Open SPIO port SerialMaster open BSP_DEVICE_NAME _SPI_0 0 amp SpiParams Set bit clock rate ioctl SerialMaster SPI_PHI_DIVIDER_32 NULL Set Data format for 16 bit ioctl SerialMaster SPI_DATAFORMAT RAW NULL SS can be left low between successive SPI bytes ioctl SerialMaster SPI_CLK_PHASE_SS_CLEAR NULL Code Example 6 DSP56824 Adapted to DSP56F805 s SPI SpiParams bSetAsMaster 1 SPIO is set as master SpiParams pSlaveSelect NULL GPIO Pin 5 used for SS SpiParams pSlaveDeselect NULL SpiParams TransmissionSize 16 Size of transmission Open SPIO port SerialMaster open BSP_DEVICE_NAME_SPI_0 0 amp SpiParams Set bit clock rate ioctl SerialMaster SPI_BAUDRATE_DIVIDER_32 NULL SS can be left low between successive SPI bytes ioctl SerialMaster SPI_CLOCK_PHASE_NOTSET NULL The code modification in Code Example 6 permi
16. e Example 3 is converted to the DSP56F805 s SCI interface in Code Example 4 These lines of code replace the references to the DSP56824 s serial support with support for the DSP56F805 s Serial Communication Interface s SCI port allowing communication with NetMedia s LCD serial device and attached keypad Code Example 4 Conversion of Code 10 Open SCI for LCD and keypad devices SciConfig SciCntl SCI_CNTL_WORD_8BIT SCI_CNTL_PARITY_NONE SCI_CNTL_TX_INVERTED SciConfig SciHiBit SCI_HIBIT_0O SciConfig BaudRate SCI_BAUD_19200 SciFD open BSP_DEVICE_NAME_SCI_1 0 amp SciConfig ioctl SciFD SCI_DATAFORMAT_EIGHTBITCHARS NULL Once the changes in Code Example 4 are made and all references to the variable Uart are converted to SciFD in the code bi directional processing between the LCD and the keypad becomes possible using the DSP56F805 s SCI port The prototype board described in AN1921 D with TPs TLC2543 and Motorola s MPX4115A absolute atmospheric pressure sensor is attached to the DSP56F805 s SPIO port J19 The EVM board s SPIO port provides the expected MISO MOSO SCLK and GND signals The DSP56824 IntFaceBaro c shown in Code Example 5 must be modified slightly to enable the GPIO s Pin 5 J28 to perform the SS signal function for the TLC2543 ADC chip The necessary changes to adapt to the DSP56F805 s SPI using the Embedde
17. f predefining the keypad s key serial data format as 0 through 15 each of the keypad s keys is serially represented by a user definable byte value This user definable value or Tag is stored within the LCD EEPROM as a 0 15 byte array Each byte of the array corresponds to a key on the keypad i e key 0 corresponds to byte 0 of the array When a key is pressed the stored byte representation for that key number is sent serially A 9 Keypad Options Various keypad options are supported by six user definable options or modes These modes are set by sending CTRL X followed by the user s command byte containing the desired modes As shown in Table A 2 placing a 1 in any one of the bits turns its corresponding option On and a 0 turns it Off Table A 2 LCD Keypad Options Table Mode Byte Name Description BO Key Beeps Beep buzzer during each key press B1 Key Press Format Sends one byte for key down and one for key up B2 LCD Echo Echoes key press data ASCII representation to LCD display AX MOTOROLA Interfacing LCDs and Porting Code 17 For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 A NetMedia s Serial LCD ARdIableA 2 y LGDsKeypad Options de ale Semiconductor inGyc 2005 WOUCTOR INC 2005
18. ftware Development Kit Programmer s Guide SDK122 D Interfacing LCDs and Porting Code 15 For More Information On This Product Go to www freescale com arcikveeseale Semiconductor Ines 2005 NetMedia s Serial LCD Appendix AarctNetMedizscSeriaMe Dyer0r INC 2005 The Serial LCD is a 4x20 LCD display with a built in bi directional serial interface The unit is controlled using standard RS 232 serial signals from a host computer or microcontroller The LCD supports these serial data rates 1200 2400 4800 9600 19200 38400 and 57600 baud A 1 Pin Definitions Figure A 1 shows a top down view of the LCD in this view the LCD display module has been removed The pin definitions are identified A 2 Serial I O ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 a a in ii nn ADC Inputs ma P A input Outputs Figure A 1 LCD Pin Definitions The serial I O header is made up of five connections Table A 1 defines the pins Table A 1 Serial I O Pin Definitions Pin Description TX serial output Top serial I O pin in Figure A 1 RX serial input Next pin down Not connected GND connected to host computer uc serial ground A 5V courtesy connection maximum 20mA 16 Interfacing LCDs and Porting Code For More Information On This Product Go to www freescale com A MOTOROLA ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 ARCHES EF
19. interface 4 1 Connecting the 634 LCD to the DSP56F805 The Crystalfontz 634 Intelligent Serial LCD module comes equipped with a male DB9 connector port The lines on the female side are connected in null modem fashion to the three pins of the EVM board s J17 header i e EVM_TXD is connected to LCD_RXD 4 2 Software for the 634 LCD and the DSP56F805 Metrowerks CodeWarrior an Embedded DSP C compiler for the DSP568xx was used to write compile and execute the code to control the 634 LCD Code Example 1 demonstrates the interface between DSP56F805 and the 634 LCD device AX MOTOROLA Interfacing LCDs and Porting Code 5 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc Interfacing the LCDs to the DSP56F805 Code Example 1 LCD634_sci_test c LCD634_sci_test c program tests the interface between a DSP 56805 using its SCI port and a LCD Crystalfontz 634 Intelligent serial display March 1 2001 include port h include io h include bsp h include fcntl h include sci h include stdio h include assert h include string h include timer h int main UWord16 I int SciFD sci_sConfig SciConfig struct timespec FiveSeconds 5 0 char aastring DSP56F805 SCI Wye char bstring J LCD 634 Disp Test char input inputarray 8 UWord16 NewScr 2 12 0 Clear Screen on LCD char astring 20 UWord
20. ne write SciFD bstring strlen bstring close SciFD 5 Converting SDK Based Code In AN1921 D an application was developed that employed a serial LCD keypad and analog to digital converter ADC attached to the SPI ports of the DSP56824 This section will describe the code modifications required to convert that application to work on the DSP56F805 AX MOTOROLA Interfacing LCDs and Porting Code 9 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc Converting SDK Based Code First the SDK serial support native to the DSP56824 is not available or needed in the DSP56F805 environment As shown previously NetMedia s LCD serial device and its associated keypad work very well with the DSP56F805 s SCI port The serial related DSP56824 s IntFaceBaro c is shown in Code Example 3 which details setup of the interface to the LCD and keypad using the DSP56824 s SDK serial library Code Example 3 Establishment of Interface Open Serial Port via SPI1 and EVM UART Uart open BSP_DEVICE_NAME_SERIAL_0 0 NewUartState MAX31 AX31 AX31 AX31 AX31 AX31 AX31 O_FIFO_DISABLE O_INT_ENABLE_DATA O_IR_DISABLE O_STOPBIT_1 O_PARITY_NONE O_WORD_8BIT 0_BAUD_9600 G O G G O G SS ioctl Uart SERIAL_DEVICE_RESET amp NewUartState The IntFaceBaro c code from Cod
21. ocessor Figure 1 shows the EVM card and the external interfaces to the two available SCI modules found on the DSP56F805 Figure 2 provides a closer view centered on the DSP s SCII interface the EVM board s J17 header The intelligent LCDs will be connected to the SCI1 port Interfacing LCDs and Porting Code A MOTOROLA For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcifveeseale Semiconductor Inc 2005 Descriptions of the Intelligent LCD Modules ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 GLA DSPS6F 805EVM L i A E mikslilahihaiahanail Figure 2 The J17 Header SCI1 Port on the DSP56F805 EVM Board 3 Descriptions of the Intelligent LCD Modules Specifications of the two intelligent serial LCD devices which will be interfaced to the DSP56F805 s SCI port are contained in this section AX MOTOROLA Interfacing LCDs and Porting Code 3 For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcikveescale Semiconductor Ines 2005 Descriptions of the Intelligent LCD Modules 3 1 Crystalfontz s 634InteHigent Seriak ECD Module viiCONDUCTOR INC 2005 This LCD module has attracted attention for its capability of interfacing as either an RS 232 device or as an SPI device As it comes from the factory it is set up for 9600 Baud RS 232 operation To use it as an SPI device the
22. on LCD write SciFD NewScr 1 write SciFD TitleStringl strlen TitleStringl write SciFD TitleString2 strlen TitleString2 determine if there are any keypad entries PosCursor 1 42 Set Cursor position in LCD write SciFD PosCursor 2 write SciFD Adj for site alt n 18 ii 0 read SciFD amp inputarray ii 1 If A key on keypad is pressed get input adjustment to barometric pressure measurement if strcmp inputarray A 0 BaroAdj SciFD amp BAdj Call BaroAdj to get adj value write SciFD NewScr 1 write SciFD TitleStringl strlen TitleStringl write SciFD TitleString2 strlen TitleString2 send command word to TLC2543 write SerialMaster amp ADcmd sizeof UWord16 read input from TLC2543 read SerialMaster UWordl6 amp Datain sizeof UWord16 12 bit result is in upper part of 16 bit word Datain Datain gt gt 4 Interfacing LCDs and Porting Code 13 For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcihveeseale Semiconductor Ines 2005 Converting SDK Based Code ARCHIVED BY FREES CALE SEMICONDUCTOR INC 2005 nanosl amp OneMillisecond NULL DataStore i Datain sum Datain accumulate measurements for batch averaging Vcount sum gt gt 6 Compute Barometric pressure
23. ons of a microprocessor Additionally the DSP56F80x family of processors offers Systems On a Chip SOC technology and as shown in Table 1 has a number of on chip capabilities to accommodate measurements and interfacing to various devices Table 1 Peripheral Device Interfaces Found on the DSP56F80x Processors SOC Devices Description Availability Motorola Scalable Communication Controller implementing DSP56F803 Controller Area Network CAN 2 0 A B DSP56F805 MSCAN DSP56F807 MUXed input 12 bit Dual 4 input 12 bit ADC DSP56F801 Analog to Digital DSP56F803 Converters ADC DSP56F805 DSP56F807 Quadrature Decoders Used to determine orientation of a motor DSP56F801 shaft DSP56F803 DSP56F805 DSP56F807 Pulse Width Modulator A modulation technique employed to DSP56F801 PWM Module control various kinds of electric motors DSP56F803 DSP56F805 DSP56F807 Serial Communication This interface allows asynchronous DSP56F801 Interface SCI Module serial communications with peripheral DSP56F803 devices and MCUs A TTL RS 232 DSP56F805 interface DSP56F807 Serial Peripheral Interface This allows full duplex synchronous DSP56F801 SPI Module serial communication between the DSP DSP56F803 and peripheral devices DSP56F805 DSP56F807 The interface techniques explained here will work equally well with any member of the DSP56F80x group of processors this application was developed for the DSP56F805 pr
24. s to the DSP56F805 Code Example 2 LCDplus_sci_test c to a DSP56F805 SCI NewMedia s Serial LCD and keypad LCDplus_sci_test c interfac serial port LCD program tests th include port h include io h include bsp h include fcntl h include sci h include stdio h include assert h include string h int main UWord16 I int SciFD sci_sConfig SciConfig static char aastring DSP56F805 LCDplus et static char bstring and Keypad test m ys int sum char input inputarray 8 static char astring 40 char LF 10 0 CR E LCD Line Feed and CR UWord16 Ly UWord16 BS 8 0 LCD backspace Open SCI Serial Device SCI_CNTL_WORD_8BIT SCI_CNTL_PARITY_NONE SCI_CNTL_TX_INVERTED SCI_HIBIT_0 SCI_BAUD_19200 SciConfig SciCntl SciConfig SciHiBit SciConfig BaudRate SciFD open BSP_DEVICE_NAME_SCI_1 1 amp SciConfig ioctl SciFD SCI_DATAFORMAT_EIGHTBITCHARS NULL write SciFD BackLightOn 2 Zi write SciFD LightLevel 2 write SciFD DispContrast 2 write SciFD NewScr 1 Turn on LCD s Backlight Wipe clean LCD s Display Setup keypad write SciFD DispKeypad 2 write SciFD aastring strlen aastring 8 Interfacing LCDs and Porting Code For More Information On This Product Go to www freescale
25. telligent Serial Display to the Serial Communication TT Interface SCI port of a DSP56F805 The demonstration 6 Conclusions 15 Oc code will be written in C and will use Motorola s Embedded w SDK libraries 7 References 15 The SCI is a three line interface consisting of a transmit line Appendix A NetMedia s Serial TXD a receive line RXD and a ground line GND The DO giana E 16 interface allows for asynchronous communication with peripheral devices and other MCUs The protocol is very similar to an RS 232 based interface except that the voltage range is that of TTL 6 O fe This note will also show the modifications required to convert the program for the DSP56824 featured in Application Note AN1921 D to the DSP56F805 using the Embedded SDK The modifications are relatively minor and made only to the respective processor s SDK supported interface code D E O A ze 2 m D 2 AA MOTOROLA Motorola Inc 2001 For More Information On This Product Go to www freescale com ARCHIVED BY FREESCALE SEMICONDUCTOR INC 2005 arcikveeseale Semiconductor Inc 2005 Interface Description 2 Interface DeastivpeienFREESCALE SEMICONDUCTOR INC 2005 Motorola s DSPS56F80x processors are DSP MCU hybrids which not only have the expected capabilities of a DSP but also the features that allow the processor to perform the functi
26. ts the DSP56F805 s SPI port to interface with the TLC2543 ADC chip The complete details of code ported from the DSP56824 to the DSP56F805 environment using the Embedded SDK are shown in Code Example 7 Code Example 7 IntFaceBaro c for the DSP56F805 Environment IntFaceBaro c Procedure used to interface to TLC2543 12 bit analog to digital converter with serial control and 11 analog inputs The DSP56F805 SPIO port is employed The software is developed for the DSP56F805 EVM environment Interface to NetMedia LCD serial display device and keypad is also included March 1 2001 A MOTOROLA Interfacing LCDs and Porting Code 11 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc Converting SDK Based Code include io h include fcntl h include bsp h include spi h include stdio h include sci h include string h include port h include timer h include types h include math h include lcd h include TLC2543 h Prototype of procedure void BaroAdj int Word32 void main void static spi_sParams SpiParams int SciFD static sci_sConfig SciConfig char TitleStringl DSP Interface Demo char TitleString2 Barometric Meas n char astring 20 static char inputarray 8 struct timespec OneMillisecond 0 1000000 int SerialMaster static UWordl6 ADcmd static UWordl6 Datain DataStore 70
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