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Trying to transmit with interrupt in XC164CS

Hi everybody,
I am learning to program with MCUs and now i have got the SK-XC164 board.I am trying to transmit via ASC0 a message. This message has 6 equal bytes and I must do it with transmit interrupt. Has anyone a simple program to practise??. The message I would like to see the message through Hyperterminal on PC. Thanks to everyone.

Parents

0 Chris Wunderlich over 17 years ago in reply to Catcus Blip

Ok you have a problem to set the interrupt levels.

Anyway I stripped down some previous code to show a bare minimum if this helps you.

#include <xc164.h>
#include <intrins.h>

unsigned int  cnt;
unsigned int  txSendCount;
unsigned char *txTailptr;
unsigned char txBuf[] = {"Hello"};

/*****************************************************/
void main(void) {
  ASC0_CON =  0x0011;
  ASC0_BG  =  0x0011;

  ALTSEL0P3 |= 0x0400;       /* select alternate output function   */
  _bfld_(P3,0x0C00,0x0400);  /* P3.10 (Tx) and P3.11 (Rx) are used */
  _bfld_(DP3,0x0C00,0x0400); /* P3.10 (Tx) and P3.11 (Rx) are used */

  ASC0_TXFCON = 0x0100;  /* transmit FIFO is disabled  */

  ASC0_TBIC  = 0x0079;

  txSendCount = 0;
  txTailptr = &txBuf[0];

  ASC0_CON |= 0x8000; /* enable baud rate generator */

  PSW_IEN = 1;        /* globally enable interrupts */

  txSendCount = 5;    /* set the number of bytes to send */
  ASC0_TBIC_IR = 1;   /* send message */

  for(;;) {     /* run forever! */
    cnt++;
  };
}

/*****************************************************/
void ASC0_TxBufferIsr (void) interrupt (0x47U) {

  if (txSendCount > 0) {
    txSendCount--;
    ASC0_TBUF = *txTailptr++;
  }
}

Reply

0 Chris Wunderlich over 17 years ago in reply to Catcus Blip

Ok you have a problem to set the interrupt levels.

Anyway I stripped down some previous code to show a bare minimum if this helps you.

#include <xc164.h>
#include <intrins.h>

unsigned int  cnt;
unsigned int  txSendCount;
unsigned char *txTailptr;
unsigned char txBuf[] = {"Hello"};

/*****************************************************/
void main(void) {
  ASC0_CON =  0x0011;
  ASC0_BG  =  0x0011;

  ALTSEL0P3 |= 0x0400;       /* select alternate output function   */
  _bfld_(P3,0x0C00,0x0400);  /* P3.10 (Tx) and P3.11 (Rx) are used */
  _bfld_(DP3,0x0C00,0x0400); /* P3.10 (Tx) and P3.11 (Rx) are used */

  ASC0_TXFCON = 0x0100;  /* transmit FIFO is disabled  */

  ASC0_TBIC  = 0x0079;

  txSendCount = 0;
  txTailptr = &txBuf[0];

  ASC0_CON |= 0x8000; /* enable baud rate generator */

  PSW_IEN = 1;        /* globally enable interrupts */

  txSendCount = 5;    /* set the number of bytes to send */
  ASC0_TBIC_IR = 1;   /* send message */

  for(;;) {     /* run forever! */
    cnt++;
  };
}

/*****************************************************/
void ASC0_TxBufferIsr (void) interrupt (0x47U) {

  if (txSendCount > 0) {
    txSendCount--;
    ASC0_TBUF = *txTailptr++;
  }
}

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