echo.c

8051 interrupt assemble code

#include <mcs51reg.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 main()
{
	uart_init();
	EA = 0;
	while(1) {
		char c;
		P1_0 ^= 1;
		c = getchar();
		P0 = c;
		putchar(c);
	}
}