hello.c

8051 interrupt assemble code

#include <mcs51reg.h>
#include <stdio.h>
#include "util.h"

void uart_init(void)
{
	SCON = 0x50;
	HIGH_NIBBLE_SET(TMOD, 2);
	TH1 = 253;
	PCON |= 0x80;
	ES = 0;
	TR1 = 1;
}

void putchar(char c)
{
	TI = 0;
	SBUF = c;
	while(!TI)
		;
}

char getchar(void)
{
	RI = 0;
	while(!RI)
		;
	return SBUF;
}

void delay(void)
{
	int i;
	for(i=0;i<30000;i++)
		;
}

void main()
{
	IE = 0;
	P0 = P1 = 0xff;
	uart_init();
	while(1) {
		printf("hello world p2 = %d p3 = %d\r\n",P2,P3);
		P1 = P2;
		P1_0 ^= 1;
		P0_0 ^= 1;
		delay();
	}
}