uart2.c

来自「手把手教你单片机」· C语言 代码 · 共 40 行

#include <reg52.h>
typedef   unsigned char  uint8;
typedef   unsigned int   uint16;

uint8 num = 0;

void UART_init(void)
{
	SCON = 0x50;
	TMOD = 0x20;
	TH1  = 0xFD;
	TL1  = 0xFD;
	TR1  = 1;
	ES   = 1;
	EA   = 1;
}
main()
{
	UART_init();
	while(1);
}

void interrupt_uart() interrupt 4
{
	if(TI)
	{
		TI = 0;
		REN = 1;
	}
	if(RI)
	{
		RI = 0;
		num = SBUF;
		num++;
		SBUF = num;
		REN  = 0;
	}
}