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Communcation between PIC's using wireless RS232

 
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homfray



Joined: 19 Nov 2003
Posts: 45
Location: Oxford

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Communcation between PIC's using wireless RS232
PostPosted: Wed Aug 10, 2005 3:46 am     Reply with quote

http://www.ccsinfo.com/forum/viewtopic.php?t=23886

Transmitter Code:
Code:
// INCLUDE FILES
#include <18F8621.h>
#device *=16 ADC=8
#include <STRING.H>
#include <STDIO.H>
#include <STDLIB.H>
#define Fosc 40000000               
//-------------------------------------------------------------------------------------
// DEFINES
#define WireTX PIN_C6
#define WireRX PIN_C7
//-------------------------------------------------------------------------------------
// COMPILER DIRECTIVES and HARDWARE CONFIGURATION
#use delay(clock = Fosc)

#fuses EC_IO      // EC Oscillator with RA6 configured as DIO
#fuses NOOSCSEN   // Oscillator System Clock Switch Disabled
#fuses NODEBUG   // No Background Debugger
#fuses NOLVP      // Low Voltage ICSP Disabled
#fuses NOPROTECT   // No Code Protect
#fuses NOWDT      // No onboard watchdog
#fuses PUT         // Power Up Timer Enabled
#fuses BROWNOUT   // Brown Out Reset enabled

#use rs232(baud=9600, xmit=WireTX, rcv=WireRX, ERRORS, STREAM=Wireless) 
void main()
{
   while(1)
   {
      fprintf(Wireless, "%c", 0xBA); // LAM - something for the RX's USART to "lock onto"
      fprintf(Wireless, "%c", 0xBE); // LAM - something for the RX's USART to "lock onto"
      fprintf(Wireless, "%c", 0xFA); // LAM - something for the RX's USART to "lock onto"
      fprintf(Wireless, "%c", 0xCE); // LAM - something for the RX's USART to "lock onto"
      fprintf(Wireless,"Dave Nice\r"); // I'm going to get the RX code to look for "Dave " as the ID...
      // ...and "Rocks" as the command/data
      delay_ms(5000);
   }   
}


Reciever Code:
Code:
#include <18F8621.h>
#device *=16 ADC=8
#define Fosc 40000000 
#define WireTX PIN_C6
#define WireRX PIN_C7
#define ConsTX PIN_G1
#define ConsRX PIN_G2
#use delay(clock = Fosc,RESTART_WDT)
#fuses EC_IO, BROWNOUT, BORV20, PUT, STVREN, NOLVP
#use rs232(baud=9600, xmit=WireTX, rcv=WireRX, ERRORS, STREAM=Wireless) 
#use rs232(baud=9600, xmit=ConsTX, rcv=ConsRX, ERRORS, STREAM=Console)             //Setup RS232

#define RX_BUFFER_SIZE 80
#define TX_BUFFER_SIZE 80

int8 rx_wr_index = 0, tx_rd_index = 0, tx_wr_index = 0, tx_counter = 0, received = 0;
int8 lock_state = 0, rxd, i, valid_data_count;
unsigned int8 rx_buffer[RX_BUFFER_SIZE + 1], tx_buffer[TX_BUFFER_SIZE + 1];
int1 data_avail = FALSE, got_id = FALSE;

#int_RDA
void RDA_isr(void) {
   rx_buffer[rx_wr_index] = getc();
   rxd = rx_buffer[rx_wr_index]; // this just makes it easier typing-wise later on
   rx_wr_index++;
   if (rx_wr_index > RX_BUFFER_SIZE) {
      rx_wr_index = 0;
   }
   
   // now look for unique ID: "Dave "
   if (rxd == 'D' && lock_state == 0) {
      lock_state++;
   }
   else if (rxd == 'a' && lock_state == 1) {
      lock_state++;
   }
   else if (rxd == 'v' && lock_state == 2) {
      lock_state++;
   }
   else if (rxd == 'e' && lock_state == 3) {
      lock_state++;
   }
   else if (rxd == ' ' && lock_state == 4) { // got the entire string "Dave ", in that order
      lock_state = 0; // reset our "combination lock"
      got_id = TRUE;
      valid_data_count = 0xff; // get ready to count the number of data bytes - we know we have to expect 5 (Rocks)
      // also going to reset the buffer write index back to 0, so that I know where my valid data will be
      rx_wr_index = 0;
   }
   else { // we didn't receive "Dave ", so reset the lock back to the beginning
      lock_state = 0;
   }
   
   if (got_id && ++valid_data_count == 5) {
      data_avail = TRUE;
      got_id = FALSE;
   }
}

#int_TBE
void TBE_isr(void) {
   if (tx_counter != 0) {
      putc(tx_buffer[tx_rd_index]);
      if (++tx_rd_index > TX_BUFFER_SIZE) {
         tx_rd_index = 0;
      }
      tx_counter--;
      if (tx_counter == 0) {
         disable_interrupts(INT_TBE);
      }
   }
}

void bputc(int c) {
   int restart = 0;

   while (tx_counter > (TX_BUFFER_SIZE - 1));

   if (tx_counter == 0) {
      restart = 1;
   }
   tx_buffer[tx_wr_index++] = c;
   if (tx_wr_index > TX_BUFFER_SIZE) {
      tx_wr_index = 0;
   }
   tx_counter++;
   if (restart == 1) {
      enable_interrupts(INT_TBE);
   }
}

void main() {

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_psp(PSP_DISABLED);
   setup_spi(FALSE);
   setup_wdt(WDT_ON);
   setup_timer_0(RTCC_INTERNAL|RTCC_OFF|RTCC_8_bit);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   enable_interrupts(INT_RDA);
   //enable_interrupts(INT_TBE);
   enable_interrupts(global);

   set_tris_e(0);
   fprintf(Console,"working");
   while (TRUE) {
      restart_wdt();
      if (data_avail) {
         data_avail = FALSE;
         fprintf(Console,"\r\n\r\nData is now available\r\nData: ");
         for (i = 0; i < 5; i++) {
            fprintf(Console,"%c",rx_buffer[i]);
         }
      }
   }
}

_________________
Nice!!!
EE031



Joined: 26 May 2009
Posts: 1

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PostPosted: Tue May 26, 2009 11:32 am     Reply with quote

Thanks for the code!

I know this is an old thread but wanted to try my chances. I'm new to PIC programming, and want to try this code. I'd be soo happy if you also have a circuit diagram for this project, in order to connect the microchip compatible with this code. Thanks again.
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