单片机定时器T0被四次调用，控制led灯 -

#include<reg52.h> //头文件
#define MY_TIMER_MAX (4) //最多四个定时器
#define NULL (0)
typedef void (*pFun)(void); //callback 函数指针类型
typedef struct myTimer
{
char on; //开关
char is_period; //是否周期循环
unsigned short int time_out; //定时时间，单位ms
unsigned short int count; //定时计数用
}
MY_TIMER;
pFun callback[MY_TIMER_MAX] = {NULL}; //定时器回调函数数组
MY_TIMER myTimerList[MY_TIMER_MAX] = {0}; //定时器结构数组
int gMyTimerMessage[MY_TIMER_MAX] = {0}; //定时器消息数组
sbit LED1=P1^0;
sbit LED2=P1^1;
sbit LED3=P1^2;
sbit LED4=P1^3;
#define ALL_ON {LED1=0;LED2=0;LED3=0;LED4=0;} //灯全开
//创建定时器，简化版本。
int CreatTimer(int index,unsigned short int time_out,char is_period,pFun callbackFun)
{
if(index >= MY_TIMER_MAX) return -1;
myTimerList[index].on = 1;
myTimerList[index].is_period = is_period;
myTimerList[index].time_out = time_out;
myTimerList[index].count = 0;
callback[index] = callbackFun;
return index;
}
//四个LED控制函数，on初始是0，第一次调用on变为1，是关灯。
void led_1_ctrl(void)
{
static char on = 0;
on = !on;
LED1 = on;
}
void led_2_ctrl(void)
{
static char on = 0;
on = !on;
LED2 = on;
}
void led_3_ctrl(void)
{
static char on = 0;
on = !on;
LED3 = on;
}
void led_4_ctrl(void)
{
static char on = 0;
on = !on;
LED4 = on;
}
void Init_Timer0(void) //初始化定时器0
{
TMOD=0x01; //定时器0，使用模式1，16位定时器
TH0=(65536-1000)/256; //给定初值
TL0=(65536-1000)%256;
EA=1; //打开总中断
ET0=1; //打开定时器中断
TR0=1; //开定时器
}
void main() //主函数
{
unsigned int i;
ALL_ON;
CreatTimer(0,250,1,led_1_ctrl);
CreatTimer(1,500,1,led_2_ctrl);
CreatTimer(2,1000,1,led_3_ctrl);
CreatTimer(3,2000,1,led_4_ctrl);
Init_Timer0();//初始化定时器0
while(1)
{
for(i = 0; i<MY_TIMER_MAX; ++i)
{
if(gMyTimerMessage[i]) //定时器消息来到，启动。
{
gMyTimerMessage[i] = 0; //消息清除
if(callback[i] != NULL)
{
(*callback[i])(); //调用回调函数
}
}
}
}
}
//定时器中断函数，1ms 定时。
void Timer0_isr(void) interrupt 1
{
unsigned int i = 0;
TH0=(65536-1000)/256;//重新赋值 1ms
TL0=(65536-1000)%256;
EA = 0;
for(i = 0; i<MY_TIMER_MAX; ++i)
{
if(myTimerList[i].on)
{
++(myTimerList[i].count); //计数
if(myTimerList[i].count >= myTimerList[i].time_out) //定时到
{
gMyTimerMessage[i] = 1; //发消息
if(myTimerList[i].is_period) //是否周期循环
{
myTimerList[i].count = 0; //计数重置
}
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