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ER400TRS USING PIC C PROGRAMMING

 
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ikeme



Joined: 23 Nov 2005
Posts: 2
Location: uk

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ER400TRS USING PIC C PROGRAMMING
PostPosted: Mon Nov 28, 2005 1:12 pm     Reply with quote
CAN SOMEONE HELP ME TO AMEND THIS CODE
ITS MET TO BE DOING
PIC C programme that will echo back every ASCII character received on the ER400TRS connected to the PICRadio PCB



#include <16F876.h>
//#device 16F876 ICD=TRUE
#use delay(clock=4000000)
#fuses XT,NOWDT, NOPROTECT, NOPUT, NOBROWNOUT
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, PARITY=N, ERRORS)


void main()
{
unsigned char c;

while(TRUE) // do forever
{
// host is ready
// receive byte
if(!(input(PIN_C4)))
{
c=getc();

output_high(PIN_C3);

putc(c);

delay_ms(1000); // send characters every 1 sec

output_high(PIN_C2);

delay_ms(1000); // send characters every 1 sec

}
}
}
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erefaaco
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 28, 2005 1:38 pm     Reply with quote
Add the NOLVP fuse. Without that fuse, your program could be locking up
and you might falsely think it's due to a coding problem. Example:

#fuses XT,NOWDT, NOPROTECT, NOPUT, NOBROWNOUT, NOLVP
asmallri



Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia

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PostPosted: Mon Nov 28, 2005 8:03 pm     Reply with quote
Code:
#fuses XT,NOWDT, NOPROTECT, NOPUT, NOBROWNOUT, NOLVP
#define XTAL_FREQ 4000000
#use delay(clock=XTAL_FREQ,RESTART_WDT)
#use rs232(baud=19200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors, restart_wdt)


   // Serial Ring Buffer and control registers
#define   CCRSize   64      // Command Construction Buffer size

   // Console Rx Ring Buffer control
byte   RxHeadC;      // Console Ring Buffer Head pointer
byte   RxTailC;      // Console Ring Buffer Tail pointer

   // allocate communications buffer memory
#define RxCQsize   64      // Console Rx buffer size
byte   RxBaseC[RxCQsize];   #locate Rx_BaseC = 0x0190   // Console Rx Buffer location


   // Tell compiler where to find serial control registers and bits for PIC16F87x
#byte   RCREG = 0x1A
#byte   RCSTA = 0x18
#define   OERR    1
#define   CREN   4


#int_RDA
void serial_isr()
   {
   // ; test for overrun error
   if (bit_test(RCSTA, OERR))
      {
      bit_clear(RCSTA, CREN);      // clear continous receive bit
      bit_set(RCSTA, CREN);      // set continous receive bit
      }

   RxBaseC[RxHeadC++]=getc();
   RxHeadC %= RxCQsize;
   }



char getc_QConsole()
///////////////////////////////////////////////////////////////////////////
//
// getc_QConsole
//
//   Routine to read (remove) a byte from the Console receive buffer
//
// On Entry:
//   Rx_TailC   points to next byte to be read from the logger receive buffer
//
// On Exit:
//   Rx_TailC   points to the next position in the buffer
//
//
// Calls:
//
///////////////////////////////////////////////////////////////////////////
   {
   Char RxChar;

   RxChar = RxBaseC[RxTailC++];
   RxTailC %= RxCQSize;
   return(RxChar);
   }




void main ()
   {
   int i;

   disable_interrupts(global);
//   setup_wdt(WDT_ON);
   restart_wdt();

   // initialise Console receive buffer pointers
   RxHeadC = 0;
   RxTailC = 0;

   // initialise the console receive USART status
   i = RCREG;
   i = RCREG;
   if (Bit_test(RCSTA,OERR))
      {
      // here on overrun error - need to reset the USART
      bit_clear(RCSTA,CREN);      // clear continous receive bit
      bit_set(RCSTA,CREN);      // set continous receive bit
      }

   // disable UART Rx interrupt
   clear_interrupt(INT_RDA);      // clear interrupt flag
   enable_interrupts(INT_RDA);      // enable the interrupt
   enable_interrupts(global);


   for (;;)
      {
      // host is ready
      // receive byte
      if(!(input(PIN_C4)))
         {
         if (RxHeadC != RxTailC)
            {
            c=getc_QConsole();
            output_high(PIN_C3);
            putc(c);
            delay_ms(1000); // send characters every 1 sec
            output_high(PIN_C2);
            delay_ms(1000); // send characters every 1 sec
            }
         }
      }
   }

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Regards, Andrew

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