easydemo_2342S/app/myTim.c

#include "myTim.h"
#include "stm32f10x_tim.h"

TIM_CALLBACK timCallBack;

//通用定时器3中断初始化
//这里时钟选择为APB1的2倍，而APB1为36M
//arr：自动重装值。
//psc：时钟预分频数
//这里使用的是定时器3!
void myTim3_init(uint32_t period_us, TIM_CALLBACK cb)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能
    //中断优先级NVIC设置
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级3级
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
    NVIC_Init(&NVIC_InitStructure);  //初始化NVIC寄存器
        
    //定时器TIM3初始化
    TIM_TimeBaseStructure.TIM_Period = period_us; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值  
    TIM_TimeBaseStructure.TIM_Prescaler = (72 - 1); //系统主时钟72MHz，TIM_ClockDivision = TIM_CKD_DIV1
                                                    //此处再72分频得到1MHz的计数时钟（即1MHz = 1us周期）
                                                    //需要多少微妙的周期，只需通过TIM_Period赋值既可得到相应
                                                    //的周期定时器
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位
 
    TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断

    TIM_Cmd(TIM3, ENABLE);  //使能TIMx 
    timCallBack = cb;         
}
// void TIM3_IRQHandler(void)   //TIM3中断
// {
//     if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //检查TIM3更新中断发生与否
//     {    
//         TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx更新中断标志 
//         if(timCallBack)
//         {
//             timCallBack();
//         }
//     }
// }
void myTim1_init(uint32_t period_us, TIM_CALLBACK cb)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //时钟使能
    //中断优先级NVIC设置
    NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;  //TIM3中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级3级
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
    NVIC_Init(&NVIC_InitStructure);  //初始化NVIC寄存器
        
    //定时器TIM3初始化
    TIM_TimeBaseStructure.TIM_Period = period_us; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值  
    TIM_TimeBaseStructure.TIM_Prescaler = (72 - 1); //系统主时钟72MHz，TIM_ClockDivision = TIM_CKD_DIV1
                                                    //此处再72分频得到1MHz的计数时钟（即1MHz = 1us周期）
                                                    //需要多少微妙的周期，只需通过TIM_Period赋值既可得到相应
                                                    //的周期定时器
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位
 
    TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE ); //使能指定的TIM3中断,允许更新中断

    TIM_Cmd(TIM1, ENABLE);  //使能TIMx    
    timCallBack = cb;                 
}
void TIM1_UP_IRQHandler(void)   //TIM1中断
{
    if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)  //检查TIM3更新中断发生与否
    {   
        TIM_ClearITPendingBit(TIM1, TIM_IT_Update  );  //清除TIMx更新中断标志 
        if(timCallBack)
        {
            timCallBack();
        }
    }
}