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Serial communication in C

Pavel Palivec

The serial communication with my self-made 8031 board works in assembler (beneath) but it does not work properly with C code doing the same. Anyone to know what the problem may be? Thanks

NAME SAMPLE

DS 10H

CSEG AT 0A100h


START: MOV SP,#50

; Oscillator frequency = 11.059 MHz
MOV TMOD,#00100000B ;C/T = 0, Mode = 2
MOV TH1,#0FDH
SETB TR1
MOV SCON,#01010010B

MOV A, #"a"
REPEAT:
JNB TI,$
CLR TI
MOV SBUF,A
SJMP REPEAT

END

Parents
  • 0 in reply to Andy Neil 

    #pragma iv(0xA000)
#include "reg51.h"
#include <stdio.h>

void main (void){
  TMOD = 0x20;
  TH1 = 0xFD;
  TR1 = 1;
  SCON = 0x52;
  //printf("a");
}

    This is my C code.
    The board sends 06h 02h 01h 05h 0BFh 0CAh 04h 05h even without calling the printf function.
    "Hello word" works the same way. When usig simulator, everything is ok.

Reply
  • 0 in reply to Andy Neil 

    #pragma iv(0xA000)
#include "reg51.h"
#include <stdio.h>

void main (void){
  TMOD = 0x20;
  TH1 = 0xFD;
  TR1 = 1;
  SCON = 0x52;
  //printf("a");
}

    This is my C code.
    The board sends 06h 02h 01h 05h 0BFh 0CAh 04h 05h even without calling the printf function.
    "Hello word" works the same way. When usig simulator, everything is ok.

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