sparrow-kit/SYSTEM/TimerBase/timer4.c

#include <stdlib.h>
#include "timer4.h"
#include "stdio.h"
#include "task.h"
#include "usart.h"

static u8 s_repeat_flag;
static time3_callback time_cb;
TIM_HandleTypeDef TIM3_Handler;      //定时器3
task *timer3_task;
void timer3_init(u16 time_set, u8 repeat_flag, time3_callback time3_cb)
{
	s_repeat_flag = repeat_flag;
	time_cb = time3_cb;
	__HAL_RCC_TIM3_CLK_ENABLE();
  HAL_NVIC_SetPriority(TIM3_IRQn,3,3);    
  HAL_NVIC_EnableIRQ(TIM3_IRQn);            
    
  TIM3_Handler.Instance=TIM3;                         
  TIM3_Handler.Init.Prescaler=35999;                  
  TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;    
  TIM3_Handler.Init.Period=2 * time_set - 1;                       
  TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
  HAL_TIM_Base_Init(&TIM3_Handler);
	timer3_stop();
}
void timer3_start(void)
{
    HAL_TIM_Base_Start_IT(&TIM3_Handler);
}

void timer3_stop(void)
{
    HAL_TIM_Base_Stop_IT(&TIM3_Handler);
}

void TIM3_IRQHandler(void)
{
    //Checks whether the TIM interrupt has occurred or not
	if(__HAL_TIM_GET_IT_SOURCE(&TIM3_Handler,TIM_IT_UPDATE)==SET)//溢出中断
    {
			task *timer3_task;
			timer3_task = new_task();
			timer3_task->handler = time_cb;
			timer3_task->pdata = NULL;
			add_task(timer3_task);
			if(0 == s_repeat_flag)
			{
				timer3_stop();
			}
			__HAL_TIM_SET_COUNTER(&TIM3_Handler,0);;    //清空定时器的CNT
			__HAL_TIM_SET_AUTORELOAD(&TIM3_Handler,1000);//恢复原来的设置
    }
		__HAL_TIM_CLEAR_IT(&TIM3_Handler, TIM_IT_UPDATE);//清除中断标志位
   
}