hello.c

8051实现232串口控制的最简单程序,仅用于学习及熟悉232串口的基本控制

#include <REG52.H>                /* special function register declarations   */
                                  /* for the intended 8051 derivative         */

#include <stdio.h>                /* prototype declarations for I/O functions */

/*------------------------------------------------
The main C function.  Program execution starts
here after stack initialization.
------------------------------------------------*/
void delay(unsigned char i);

void main (void) {

#ifndef MONITOR51
    SCON  = 0x50;		        /* SCON: mode 1, 8-bit UART, enable rcvr      */
    TMOD |= 0x20;               /* TMOD: timer 1, mode 2, 8-bit reload        */
    TH1   = 0xfd;               /* TH1:  reload value for 9600 baud @ 11.0592MHz   */
    TR1   = 1;                  /* TR1:  timer 1 run                          */
    TI    = 1;                  /* TI:   set TI to send first char of UART    */
#endif

/*------------------------------------------------
Note that an embedded program never exits (because
there is no operating system to return to).  It
must loop and execute forever.
------------------------------------------------*/
  while (1) {
    P1 ^= 0x01;     		    /* Toggle P1.0 each time we print */
    printf ("Hello World\n");   /* Print "Hello World" */
	delay(10);
  }
}

void delay(unsigned char i)
{
	unsigned char j;
	for(i; i > 0; i--)
		for(j = 200; j > 0; j--);
}