setpulse.c

来自「一个基于STC89C52的单片机程序」· C语言 代码 · 共 51 行

#include "STC12C5410AD.h"
#include "type.h"

sbit Pulse_OP = P1^3;
#define TH0_RELOAD 0xFC
#define TL0_RELOAD 0x17
#define HIGH_INTERVAL 100
#define LOW_INTERVAL  1000 

/*****变量定义*******/
uint16_t current_count = 0;
uint16_t count[2]={HIGH_INTERVAL, LOW_INTERVAL};
uint16_t elec=0;

void timer0_init(void)
{
	TMOD=0x01;
	EA=1;
	ET0=1;
	Pulse_OP = 1;
}

void start_timer0(void)
{
	TH0=TH0_RELOAD;
	TL0=TL0_RELOAD;
	TR0=1;
}

void stop_timer0(void)
{
	TR0=0;
}

void timer0_isq(void) interrupt 1
{
	if(current_count >= count[elec])
	{
		current_count = 0;
		elec = (elec+1)%2;
		Pulse_OP = ~Pulse_OP;
	}
	else
	{
		current_count++;
	}
	start_timer0();
}