RL78/G12 Visible Light Beacon Transmission Program
Contents
1. CHECK _FRAME OUTPUT_4PPM v v AA tx_buff_ptr 0 4 PPM encoding tx_buff_ptr Vv The LED state information whether to be switched on or off is acquired from slot_pattern slot_pattern slot_pattern jas transmission is No loop 0 0b111000000000 4 PPM encoded data of all frames been p ompleted aa Eine Yes ave all slot No me D OUTPUT_4PPM OUTPUT_4PPM frame send t been output Y Yes next_state next_state next_state next_state state next_state SET_FRAME CHECK_FRAME SET_PREAMBLE SET_FRAME Figure 6 4 Updating of LED State Information On or Off 7 Sample Program The sample program is available on the Renesas Electronics Website 8 Documents for Reference RL78 G12 User s Manual Hardware R01UH0200E RL78 Family User s Manual Software RO1US0015E The latest versions of the documents are available on the Renesas Electronics Website Technical Updates Technical Brochures The latest versions of the documents are available on the Renesas Electronics Website Website and Support Renesas Electronics Website http www renesas com index jsp Inquiries http www renesas com contact R20AN0321EJ0100 Rev 1 00 Aug 06 2014 2tENESAS 12 RL78 G12 Visible Light Beacon Transmission Program Date Description Page Summary Aug 06 2014 _ Fi2. 06 2014 RL78 G12 Visible Light Beacon Transmission Program 5 3 Description of the Components Table 0 1 List of Components to be Used Name Manufacturer Type Number Button battery holder COMFORTABLE ELECTRONIC CH74 2032LF SW2 for power source SWITRONIC S12D01G4 Super bright LED Avago Technologies HLMP EL1A Z1KDV Fixed resistor of 62 Q 5 4 Circuit Diagram The circuit diagram implemented on the universal RL78 G12 target board is shown below i 2 haa C4 5 6 7 4 3 i a Ls Dy y i T um g I HLMP ELLA 21K DY SWE CNL 551200164 Q8 A5F10264 TB Let 4 3 os BHi T CHT4 2032LF 6 E 10 ENZ QS ASF10264 TE Figure 5 2 Circuit Diagram R20AN0321EJ0100 Rev 1 00 a2 AS 5 Aug 06 2014 XENES RL78 G12 Visible Light Beacon Transmission Program 6 Description of the Software 6 1 Outline of the Software Processing The sample program covered in this application note switches the transmitted ID DATA field in response to SW1 being pressed It also uses an interval timer interrupt that is generated every 104 usec to turn the LED on and off with timing in accord with the standard for visible light communications Figure 6 1 is a schematic view of the system Switch bounce VLC modulation block SW elimination block HW RL78 G12 Figure 6 1 Schematic View of the System 6 2 List of Option Byte Settings Table 6 1 summarizes the settings of the op
3. This function calls the initialization function of the hardware and its main loop handles elimination of switch bounce It also sets a flag to indicate the ID DATA field currently being transmitted and switches the indicator LEDs on detection of the falling edge of SW1 None None Function Name CPU Init Synopsis Declaration Explanation Arguments Return value Initializes the clock pulse generator void CPU_Init void This function sets the clock operating mode to the X1 oscillation mode sets the high speed system clock fmx as the system clock enables operation of the X1 oscillation circuit and disables the high speed on chip oscillator clock None None Function Name TIMER Init Synopsis Declaration Explanation Arguments Return value Initializes the timers void TIMER_Init void This function activates the timer array unit to measure intervals of 104 15 us and 10 ms None None Function Name PORT Init Synopsis Declaration Explanation Arguments Return value Sets port pins void PORT_Init void This function makes the port register Px port mode register PMx port mode control register PMCx pull up resistor option register PUx port input mode register PIMx port output mode register POMx and A D port configuration register ADPC settings for the respective pins None None Function Name VLC Timer Aug 06 2014 Synopsis Handler for timer interrupts 104 usec Declarati
4. completed In a similar way the states of pins in a product that is reset by an on chip power on reset function are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified 3 Prohibition of Access to Reserved Addresses Access to reserved addresses is prohibited The reserved addresses are provided for the possible future expansion of functions Do not access these addresses the correct operation of LSI is not guaranteed if they are accessed 4 Clock Signals After applying a reset only release the reset line after the operating clock signal has become stable When switching the clock signal during program execution wait until the target clock signal has stabilized When the clock signal is generated with an external resonator or from an external oscillator during a reset ensure that the reset line is only released after full stabilization of the clock signal Moreover when switching to a clock signal produced with an external resonator or by an external oscillator while program execution is in progress wait until the target clock signal is stable 5 Differences between Products Before changing from one product to another i e to a product with a different part number confirm that the change will not lead to problems The characteristics of an MPU or MCU in the same group but having a different part number may differ in terms of the internal memory
5. 26A TB manufactured by Renesas Electronics Cooperation with a button battery holder switch and super bright LED added to the universal version of the target board Figure 5 1 is the hardware configuration of the simple transmitter board 5 1 List of Pins to be Used SW1 for switching the ID DATA Figure 5 1 RL78 G12 Simple Transmitter Table 5 1 Pins to be Used and their Functions Pin Name Input Output Description P10 Output Control pin for the LED used in visible light communications P13 Output Control pin for an indicator LED LED1 P14 Output Control pin for an indicator LED LED2 X1 Input Pin for connection to the 20 MHz resonator X2 Input Pin for connection to the 20 MHz resonator P137 Input Input for SW1 used to switch the ID DATA field 5 2 Operation Procedure 5 2 1 Connection to Power Source Setting the CR 2032 and turning on the power switch enables the visible light beacon system to transmit the signals through the super bright LED 5 2 2 Switching of IDs Pressing SW1 enables switching of the transmitted ID DATA field Table 5 2 Transmitted ID DATA Values Number of Times SW1 is Pressed F Type IDs LED1 LED2 0 0 Renesas Renesas On On 1 0 0356853N1393715E Off On 2 0 ABCDEFGHIJKLMNOP On Off 3 0 VisibleLightComm Off Off Further pressing of the switch causes the sequence to be repeated R20AN0321EJ0100 Rev 1 00 ztENESAS 4 Aug
6. ARARE 10 6 7 1 Timer Interrupt Function sssussssensennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannnnnnnnnnnnn nnmnnn nna 11 6 7 2 Function to Update the LED State Information Whether to be Switched On or Offl essssssseeeees 12 Te Sample Program sesveicercssenssicicsccecctes cvsewevend exstwdeeeneeadeceeeancbvediv i dewee neues sa vee Sare Novaa NAVV CANKAN CNE a EENEN T Suvenir HNES 12 8 D ments f r ReterenCe vieic occiscscc eset ceed cies ceadeedh cocestedecccetcecceuacuaicenuaseedaac cuecdegiscsseccsuveuiedsssseccueseepeeteccepeersecsecnecess 12 R20AN0321EJ0100 Rev 1 00 2tENESAS 1 Aug 06 2014 RL78 G12 Visible Light Beacon Transmission Program 1 Specification The sample program covered in this application note can be used to control turning an LED on and off to transmit signals in a visible light beacon system compliant with the JEITA CP 1223 standard The data being transmitted can be switched by pressing a button on the target board http www renesas com products tools introductory evaluation tools cpu_board gb r5f1026a_tb index jsp 2 Operation Check Conditions The sample code described in this application note has been checked under the conditions listed in the table below Table 2 1 Operation Check Conditions Item Description Microcontroller used RL78 G12 R5F1026A Operating frequency Main clock OSC1 20 MHz Operating voltag
7. capacity layout pattern and other factors which can affect the ranges of electrical characteristics such as characteristic values operating margins immunity to noise and amount of radiated noise When changing to a product with a different part number implement a system evaluation test for the given product Notice 1 Descriptions of circuits software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples You are fully responsible for the incorporation of these circuits software and information in the design of your equipment Renesas Electronics assumes no responsibility for any losses incurred by you or third parties arising from the use of these circuits software or information 2 Renesas Electronics has used reasonable care in preparing the information included in this document but Renesas Electronics does not warrant that such information is error free Renesas Electronics assumes no liability whatsoever for any damages incurred by you resulting from errors in or omissions from the information included herein 3 Renesas Electronics does not assume any liability for infringement of patents copyrights or other intellectual property rights of third parties by or arising from the use of Renesas Electronics products or technical information described in this document No license express implied or otherwise is granted hereby under any pat
8. d i icsiei cists ssc E tee E EAA ERARE EEE E A 4 5 2 Operation Proced ra aan aaa ctu aeaaea aa aaa a a an Ma eean aa ea eaaa 4 5 2 1 Connection to Power SOUrCe s sssnsssasnsnsnnnsnannnnnnannnannnnnnnnnnnnnnannnnnnnnnnannnnnnnannnnannnsnnnanaasnnnnannnannnnnnannnaannnanaannann 4 5 2 2 Switching Of DS asics oc dasci cases stecntedecdaetegcced va bceccees eget eutenctesue enue xvoeeecteei estes sucanesedeccans AA RE ONNE SHVANN SSE Sa rE oE ENPAS 4 5 3 Description of the COMpOnentsS ssssssssssuunsunnnnunnuunnunnnuunnnnnnnnnnnuunnunnnunnnunnnnnnnnnnnuunnnunnnnnnnnnnnn nnmnnn nnmnnn 5 5 4 Circuit Diagrami sisina auan aeaa aeiaai ae Sect ce ace ect aapa aana aaa a aa aa aa aaa aaa aa aaea aa aaan 5 6 Description of the Software jiccccsicdcsicccsteccccaccsciccsceccsecscccteessctescteesceceseenssadeesacessaeeeseacescadescues stecsdde ecscessonezenicescuesssendecers 6 6 1 Outline of the Software ProCeSSinG s cseccceseeesseeseseeneneeeeeeeeeeseaeensneeeeeeeescaesaaeeeenseaesseesaseeeenseeeees 6 6 2 List of Option Byte Settings cccsecceseeeseeeeeeeeesneseneeeeneneeeeaeeeeseeeeneeeeseaesesaeesaseeeeeeeeesseaesneeeenseeeneas 6 Bid Listoi Funcions carena EA EAA A EAA AAAA AA AA 6 6 4 FUMCION Specificatii Suisiana uaina aada aaea aa a uaaa aada aaia aaa aaa a aa aaiae aada an 7 65 List Of Constants sser Aa OEE SAN a 9 66 Ist Of Variable S ssis E AEE AE 9 6 7 FIOWCH AMS oo caon anana ana AARAA AARAA EHARA AARAA ARAN AREARE RAAR a
9. e 3 0 V Operation is possible within the range of voltage from 2 7 V to 3 0 V Integrated development CubeSuite V2 00 00 environment CubeSuite C compiler CubeSuite CA78KO 4 00 00 09 Integrated development e2studio V3 0 0 22 environment e2studio C compiler e2studio KPIT GNURL78 ELF Toolchain V14 01 Integrated development IAR Embedded Workbench for Renesas RL78 V1 40 1 environment IAR C compiler IAR IAR C C Compiler for Renesas RL78 V1 40 3 System Overview The system consists of a transmitter subsequently referred to as the simple RL78 G12 transmitter using the RL78 G12 target board QB R5F1026A TB a visible light beacon system reception module separately sold and a PC The sample program covered in this application note handles the sending of visible light beacon signals from the simple RL78 G12 transmitter and the received signals can be checked through a GUI on the PC Visible light beacon system reception module VL 100 USB 3R manufactured by NAITO DENSEI MACHIDA MFG CO LTD Simple RL78 G12 transmitter Figure 3 1 System Overview R20AN0321EJ0100 Rev 1 00 a2 AS 2 Aug 06 2014 XENES RL78 G12 Visible Light Beacon Transmission Program 4 Characteristics of the Visible Light Beacon System This section describes the format used in the visible light communications For details see the specifications of the visible light beacon system as defined in Japan Electronics and Information Technology Indu
10. eUpdate void This function updates the LED state information i e determines whether it is to be switched on or off in accordance with the frame being transmitted None 0 In the midst of frame transmission 1 At the end of the frame Function Name VLC _Encode4ppm Synopsis Declaration Explanation Arguments Return value Handles 4 PPM encoding unsigned short VLC_Encode4ppm unsigned char data This function converts 8 bit data to 4 PPM data taking up 16 slots 8 bit data 16 slots of 4 PPM data Function Name VLC_GetCrce Aug 06 2014 Synopsis Generates CRC code Declaration unsigned short VLC_GetCrc unsigned char buff int size Explanation This function generates the CRC code Arguments buff Address where the buffer for storing the CRC code starts Size Buffer size Return value CRC code R20AN0321EJ0100 Rev 1 00 RENESAS 8 RL78 G12 Visible Light Beacon Transmission Program 6 5 List of Constants Constant Setting Description vic_payload 4 16 Renesas Renesas ID DATA fields for transmission 0356853N1393715E ABCDEFGHIJKLMNOP VisibleLightComm led_table 4 2 LED_ON LED_ON Information on the states of the indicator LEDs LED_OFF LED_ON sequence of whether they are to be on or off LED_ON LED_OFF LED_OFF LED_OFF crc16_table 256 See the source code Table information for generating CRC16 XTX EX HH bitrev_table 256 See the source code Table for acqui
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16. on void VLC_Timer void Explanation This function is the handler for the 104 us interval interrupts and determines whether the LED for visible light transmission is to be turned on or off or to be left in its current state as each 104 us interval elapses When the ID DATA field is to be switched in response to SW1 being pressed the frame updating function VLC_InitFrame is also called from within the interrupt handler Arguments None Return value None R20AN0321EJ0100 Rev 1 00 stENESAS 7 RL78 G12 Visible Light Beacon Transmission Program Function Name VLC InitFrame Synopsis Declaration Explanation Arguments Return value Generates the visible light frame for transmission void VLC_InitFrame unsigned char frame_type unsigned char payload This function generates the visible light frame for transmission in an internal buffer frame_type Frame type Payload 16 byte ID data None Function Name VLC GetPulse Synopsis Declaration Explanation Arguments Return value Acquires information on the state of the LED i e whether it is on or off unsigned char VLC_GetPulse void This function acquires information on the state of the LED i e whether it is on or off None 0 LED is on 1 LED is off Function Name VLC PulseUpdate Synopsis Declaration Explanation Arguments Return value Updates the LED state information i e determines whether it is to be switched on or off unsigned char VLC_Puls
17. ring 1 byte of bit inverted data vic_4ppm_table 4 Ox08U 0x02U 0x04U 0x01U Table of 4 PPM slot level sequences 6 6 List of Variables Table 6 2 lists the global variables that are used in this sample program Table 6 2 Global Variables Type Variable Name Contents Function Used chattering chat SW information from sampling three times at 10 ms main intervals unsigned char id_change Flag to indicate timing of ID DATA switching main VLC_Timer unsigned char id_sel Index of ID DATA field currently being transmitted main 0 to 3 VLC_Timer unsigned char sw1 SW1 information after bounce is eliminated main unsigned char tx_buff Frame of data for visible light transmission VLC_InitFrame VLC_PulseUpdate unsigned char tx_buff_ptr Index information on the buffer holding the frame of VLC_PulseUpdate data for visible light transmission int state Current internal state VLC_PulseUpdate int next_state Next internal state to be entered VLC_PulseUpdate unsigned short slot_pattern Slot data for 4 PPM symbols VLC_PulseUpdate unsigned short slot_num The number of slots that have been updated VLC_PulseUpdate unsigned char vic_pulse Information on the state of the LED i e whether it is VLC_GetPulse on or off VLC_PulseUpdate Aug 06 2014 RL78 G12 Visible Light Beacon Transmission Program 6 7 Flowcharts Figure 6 2 shows the flow of the main routine of the sample program DI Set
18. rst edition issued All trademarks and registered trademarks are the property of their respective owners A 1 General Precautions in the Handling of MPU MCU Products The following usage notes are applicable to all MPU MCU products from Renesas For detailed usage notes on the products covered by this document refer to the relevant sections of the document as well as any technical updates that have been issued for the products 1 Handling of Unused Pins Handle unused pins in accordance with the directions given under Handling of Unused Pins in the manual The input pins of CMOS products are generally in the high impedance state In operation with an unused pin in the open circuit state extra electromagnetic noise is induced in the vicinity of LSI an associated shoot through current flows internally and malfunctions occur due to the false recognition of the pin state as an input signal become possible Unused pins should be handled as described under Handling of Unused Pins in the manual 2 Processing at Power on The state of the product is undefined at the moment when power is supplied The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined at the moment when power is supplied In a finished product where the reset signal is applied to the external reset pin the states of pins are not guaranteed from the moment when power is supplied until the reset process is
19. stries Association JEITA standard CP 1223 Data rate 4 8 Kb s Method of transmission 4PPM inverted 4 slot pulse position modulation eee eee YP Pee ieee let aleiele Bright I I I I I I i i i Preamble PRE aa y x Each slot takes up 0 104 ms i e slots are sent at 9 6 kHz Frame configuration Dark SOF Payload EOF Start of Frame End of Frame PRE F TYPE ID DATA CRC 16 6 bits 8 bits 128 bits 16 bits 4 1 Preamble PRE The PRE field defines the starting position of a frame and is not 4 PPM encoded It consists of three ones followed by nine zeros 12 slot symbol 111 000 000 000 4 2 Frame Type F TYPE The frame type field holds an 8 bit code that indicates the type of payload The value is 0x00 in the sample program since this indicates a payload for use in testing and development 4 3 ID DATA The length of the ID DATA field is 128 bits and may be used to hold an ID code and data or any desired data 4 4 CRC Field The CRC field is 16 bits long and is used on the receiving side to determine whether reception of the frame was successful The CRC field holds the result calculated by the following generating polynomial KEKE R20AN0321EJ0100 Rev 1 00 a2 AS 3 Aug 06 2014 XENES RL78 G12 Visible Light Beacon Transmission Program 5 Description of the Transmitter Board The simple RL78 G12 transmitter mainly consists of an RL78 G12 target board QB R5F10
20. the CPU clock Set the pins Set the timer Initial registration of the ID DATA field for visible light transmission as the flag for the 10 ms timer been set R20AN0321EJ0100 Rev 1 00 Aug 06 2014 Elimination of bounce as the rising edge been detected Ne Updating of the ID DATA number The flag to indicate switching of the ID DATA is set The indicator LEDs are switched on or off Figure 6 2 Flow of Main 2tENESAS 10 RL78 G12 Visible Light Beacon Transmission Program 6 7 1 Timer Interrupt Function Figure 6 3 shows the flow of the timer interrupt function VLC_Timer Acquire information on the LED state on or off Update the LED state information whether to be switched on or off Yes End of frame No Has the flag to indicate switching of the ID DATA field been set Yes The ID DATA field for visible light transmission is changed RETI Figure 0 1 Timer Interrupt Function R20AN0321EJ0100 Rev 1 00 a2 AS 11 Aug 06 2014 XENES RL78 G12 Visible Light Beacon Transmission Program 6 7 2 Function to Update the LED State Information Whether to be Switched On or Off Figure 6 4 shows the flow of processing by the function to update the LED state information i e whether it is to be switched on or off VLC_PulseUpdate loop 1 frame_end 0 4 Loop 10 No Return frame_end Yes SET_PREAMBLE SET_FRAME
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22. tion bytes Table 6 1 Option Byte Settings Address Value Description 000COH 010COH 11100000B Disables the watchdog timer counting stops after release from the reset state 000C1H 010C1H_ 10000001B LVD OFF 000C2H 010C2H_ 11100000B HS mode HOCO 24 MHz 000C3H 010C3H 10000100B Enables the on chip debugger 6 3 List of Functions R20AN0321EJ0100 Rev 1 00 Function Name Outline File Name main Eliminates switch bounce in the signal from SW1 main c CPU_Init Initializes the clock pulse generator main c TIMER_Init Initializes the timers main c PORT Init Sets port pins main c VLC_Timer Handler for timer interrupts 104 usec main c VLC_InitFrame Generates the visible light frame for transmission vic c VLC_GetPulse Acquires information on the state of the LED i e whether it is on or off vic c VLC_PulseUpdate Updates the LED state information i e determines whether it is to be vic c switched on or off VLC_Encode4ppm Handles 4 PPM encoding vic c VLC_GetCre Generates CRC code vic c Aug 06 2014 2tENESAS RL78 G12 Visible Light Beacon Transmission Program 6 4 Function Specifications This section describes the specifications for the functions that are used in the sample program Function Name main Synopsis Declaration Explanation Arguments Return value Eliminates switch bounce in the signal from SW1 void main void
23. xt Application Note lt ENESAS RL78 G12 Visible Light Beacon Transmission Program R20AN0321EJ0100 Rev 1 00 Development Environments CubeSuite IAR and e2studio Augen e014 Introduction This application note explains the sample program for using the RL78 G12 to control transmission through a visible light communications beacon system The visible light beacon system is compliant with the JEITA CP 1223 standard Target Device RL78 G12 Contents ML ASPOCHICAU OM e E ETT TT E eave des esecaale ccc E E T 2 2 Operation Check Condition ici cscicccvcesssensetedectiecnc testes secetecnascnuuesd ctuecuesscvessdeesticeseucvnandechuelsecessaeeetiendaueveenescabiencaes 2 Be SYSUCM OVErView EE E leeds clas at cass ck cscc A eg cates nec edeg Sosa cag eaten caus seceuctedectaytedsdstectdeasiesuessousyucsenvenessaageenen 2 4 Characteristics of the Visible Light Beacon System ccssecceseesseeeseeeeeseeeeeeeenseeenseaeneeeeeseasseeeeaeeasaseeseseeeeeeeeseeeeeas 3 4 1 Preamble PRE A A EE AAAA EEA AAAA 3 4 2 Frame Type F TYPE an e aaea aaea aa eaea aaae aaa aaa aa aA eaaa aa aea SE aas Paaa 3 A3 IDDA TA eE AEEA AAEE EEE 3 AA CRC Field veicicccsetetscciveseeetevicacer E a ten dere desteucv vd ieavelvsscue tienen eaerdteestaues 3 5 Description of the Transmitter Board c ccceesseeeeeseeeeeeeeeeeeeeseeeeesseeeesaseeeeeeaseneseseseeseaseeeeeeaseeesesseeeeaseeeeeenseeeeaneeeeey 4 5 1 Listot Pins to be USe
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