51单片机基于一个定时器实现多个软件定时器 -

#include "reg51.h"
//#include "STC89C5xRC.h"
sbit LED1=P1^0;
sbit LED2=P1^1;
sbit LED3=P1^2;
sbit LED4=P1^3;
unsigned char softTimer_8s_flag = 0; //8s定时器flag
#define NULL 0
#define SOFT_TIMER_MAX 4 //定时器个数
//定义定时器ID
#define ID_1S_LED_TASK 0
#define ID_2S_LED_TASK 1
#define ID_4S_LED_TASK 2
#define ID_8S_LED_TASK 3
typedef void (*pFun)(void); //callback 函数指针类型
typedef enum tmrMode {
MODE_ONE_SHOT = 0, //单次模式
MODE_PERIODIC, //周期模式
} tmrMode;
typedef enum tmrState {
SOFT_TIMER_STOPPED = 0, //停止
SOFT_TIMER_RUNNING, //运行
SOFT_TIMER_TIMEOUT, //超时
SOFT_TIMER_WAITING //等待
} tmrState;
typedef struct softTimer {
unsigned char state; //状态
unsigned char mode; //模式
unsigned int period; //定时周期
unsigned int count; //定时计数用
pFun callback; //定时器回调函数
} softTimer;
//定时器结构数组
softTimer softTimerList[SOFT_TIMER_MAX] = {0};
//设定定时器
void softTimer_Creat(unsigned char id,tmrMode mode,unsigned int interval,pFun cb)
{
softTimerList[id].mode = mode;
softTimerList[id].period = interval;
softTimerList[id].count = 0;
softTimerList[id].callback = cb;
softTimerList[id].state = SOFT_TIMER_STOPPED;
}
//打开定时器
void softTimer_Start(unsigned int id)
{
softTimerList[id].state = SOFT_TIMER_RUNNING;
}
//停止定时器
void softTimer_Stop(unsigned int id)
{
softTimerList[id].state = SOFT_TIMER_STOPPED;
}
//清除定时器状态（用于执行事件后手动清除定时器状态）
void softTimer_Clr(unsigned int id)
{
if(softTimerList[id].mode == MODE_ONE_SHOT){
softTimerList[id].state = SOFT_TIMER_STOPPED;
}else{
softTimerList[id].state = SOFT_TIMER_RUNNING;
}
}
//获取定时器状态
unsigned char softTimer_GetState(unsigned int id)
{
return softTimerList[id].state;
}
void softTimer_Update(void) //更新定时器状态，在硬件定时器中1ms调用一次
{
unsigned char id;
for(id = 0 ;id <= SOFT_TIMER_MAX ; id++ ){
switch (softTimerList[id].state){
case SOFT_TIMER_STOPPED:
break;
case SOFT_TIMER_RUNNING:
if(softTimerList[id].count < softTimerList[id].period){
softTimerList[id].count ++;
}else{
softTimerList[id].count = 0;
softTimerList[id].state = SOFT_TIMER_TIMEOUT;
softTimerList[id].callback();
}
break;
case SOFT_TIMER_TIMEOUT:
if(softTimerList[id].mode == MODE_ONE_SHOT) {
softTimerList[id].state = SOFT_TIMER_STOPPED;
} else {
softTimerList[id].count ++;
softTimerList[id].state = SOFT_TIMER_RUNNING;
}
break;
default: //state error
break;
}
}
}
void Timer0Init(void) //1毫秒@12.000MHz
{
TMOD = 0x00; //设置定时器模式
TL0 = 0xC0; //设置定时初值
TH0 = 0xE0; //设置定时初值
EA = 1;
ET0 = 1;
TR0 = 1;
}
void Interrupt() interrupt 1
{
TL0 = 0xC0; //重载定时初值
TH0 = 0xE0; //重载定时初值
softTimer_Update(); //1ms更新一次softTimer
}
void Delayms(unsigned int ms) //@12.000MHz
{
unsigned char i, j;
while(--ms) {
i = 2;
j = 239;
do {
while (--j);
} while (--i);
}
}
void softTimer_1s_cb(void)
{
LED1 = ~LED1;
}
void softTimer_2s_cb(void)
{
LED2 = ~LED2;
}
void softTimer_4s_cb(void)
{
LED3 = ~LED3;
}
void softTimer_8s_cb(void)
{
softTimer_8s_flag = 1;
}
void main() //主函数
{
LED1=0;LED2=0;LED3=0;LED4=0;
//配置相应定时器
softTimer_Creat(ID_1S_LED_TASK,MODE_PERIODIC,1000,softTimer_1s_cb);
softTimer_Creat(ID_2S_LED_TASK,MODE_PERIODIC,2000,softTimer_2s_cb);
softTimer_Creat(ID_4S_LED_TASK,MODE_ONE_SHOT,4000,softTimer_4s_cb);
softTimer_Creat(ID_8S_LED_TASK,MODE_PERIODIC,8000,softTimer_8s_cb);
//打开相应定时器
softTimer_Start(ID_1S_LED_TASK);
softTimer_Start(ID_2S_LED_TASK);
softTimer_Start(ID_4S_LED_TASK);
softTimer_Start(ID_8S_LED_TASK);
Timer0Init();//初始化定时器0
while(1) {
//尽量少用延时，如果事件处理耗时较长，应在main中执行
if(softTimer_8s_flag == 1)
{
LED4=~LED4;
Delayms(200);//模拟耗时事件
softTimer_8s_flag = 0;
}
}
}

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