STM32定时器及中断简单程序

//----------------------------main（）--------------------

//stm32f103c8t6有3个普通1个高级定时器

//每次进入中断服务程序间隔时间为

//((1+TIM_Prescaler )/72M)*(1+TIM_Period )=((1+7199)/72M)*(1+9999)=1秒

#include

#define D13_ON GPIO_ResetBits(GPIOC,GPIO_Pin_13)

#define D13_OFF GPIO_SetBits(GPIOC,GPIO_Pin_13)

void GPIO_Config(void);

void TIM2_Config(u16 arr,u16 psc);

void NVIC_Config(void);

//主函数

int main(void)

{

    GPIO_Config();

    //((1+arr )/72M)*(1+psc )=((1+1999)/72M)*(1+35999)=1秒

    TIM2_Config(1999,35999);

    NVIC_Config();

    while(1);

}

//初始化GPIO

void GPIO_Config(void)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);

    //PC13灯

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

    GPIO_Init(GPIOC,&GPIO_InitStructure);

    GPIO_ResetBits(GPIOC,GPIO_Pin_13); //关闭LED

}

//初始化TIM2定时器及中断

//每次进入中断服务程序间隔时间为

//((1+arr )/72M)*(1+psc )=((1+1999)/72M)*(1+35999)=1秒

void TIM2_Config(u16 arr,u16 psc)

{

    //定时器时间是1s

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

    //清除中断标志位

    TIM_ClearITPendingBit(TIM2,TIM_IT_Update);//TIM_ClearFlag(TIM2,TIM_FLAG_Update);//两者作用相同

    //自动装载的周期值0-0xffff，72M/36000=2000

    TIM_TimeBaseStructure.TIM_Period = arr;

    //时钟除数预分频值0-oxffff，下面是36000分频

    TIM_TimeBaseStructure.TIM_Prescaler = psc;

    ////普通和高级才有下面两行

    //时钟分割，暂时为0，高级应用才用

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    //计数模式，向上下，中央对齐123

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);

    //开启中断

    TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);

    //开启外设

    TIM_Cmd(TIM2,ENABLE);

}

//初始化中断向量控制器NVIC

void NVIC_Config(void)

{

    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

}

//--------------------stm32f10x_it.c------------------------

//中断函数中自己编写

void TIM2_IRQHandler(void)

{

    //判断TIM3更新中断是否发生

    if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)

    {

        //必须清楚标志位

    TIM_ClearITPendingBit(TIM2,TIM_IT_Update);

    //状态取反

    GPIO_WriteBit(GPIOC,GPIO_Pin_13,(BitAction)(!GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_13)));

    }

}