Help me figure out this rs232 and c18 example (Proteus).

[asic1984]

hi

i tried this example in proteus but it didnot work ,where is the problem

#include <p18f452.h>
#include <usart.h>

/* Set configuration bits for use with ICD2 / PICDEM2 PLUS Demo Board:
 *  - set HS oscillator
 *  - disable watchdog timer
 *  - disable low voltage programming
 *  - enable background debugging
 */
#pragma config OSC = HS
#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config DEBUG = ON

void rx_handler (void);

#define BUF_SIZE 25




#pragma code rx_interrupt = 0x8
void rx_int (void)
{
  _asm goto rx_handler _endasm
}
#pragma code

#pragma interrupt rx_handler
void rx_handler (void)
{
  unsigned char c;

  /* Get the character received from the USART */
  c = ReadUSART();
  if (c >= '0' && c <= '9')
    {
     // c -= '0';
      /* Display value received on LEDs */
      PORTB = c;

      /*
       * Display the string located at the array offset
       * of the character received
       */
      putsUSART (c);
      PORTB = c;
    }
    else
    {
      /*
       * Invalid character received from USART.
       * Display error string.
       */
      putsUSART (c);

      /* Display value received on LEDs */
      PORTB = c;
    }

    /* Clear the interrupt flag */
    PIR1bits.RCIF = 0;
}

void main (void)
{
  /* Configure all PORTB pins for output */
  TRISB = 0;

  /* Open the USART configured as 8N1, 2400 baud, in polled mode */
  OpenUSART (USART_TX_INT_OFF &
             USART_RX_INT_ON &
             USART_ASYNCH_MODE &
             USART_EIGHT_BIT &
             USART_CONT_RX &
             USART_BRGH_LOW, 31);

  /* Display a prompt to the USART */
  putrsUSART ((const far rom char *)"\n\rEnter a digit 0-9!\n\r");

  /* Enable interrupt priority */
  RCONbits.IPEN = 1;

  /* Make receive interrupt high priority */
  IPR1bits.RCIP = 1;

  /* Enable all high priority interrupts */
  INTCONbits.GIEH = 1;

  /* Loop forever */
  while (1)
    ;
}

thanks for help

 

[AlundrA]

usart c18

I think the problem is crystal freq. you should set it to 5Mhz (it's because the code is written for picdem2 plus demo board i think)

As you see its working and showing '6' at the terminals rb0-rb3 (0110)

Don't forget to set virtual terminal's baud rate to 2400

Ps:i agree with your avatars message