定时器TIM，pwm

一、定时器

1. 定义

设置等待时间，到达后则执行指定操作的硬件。

2. STM32F407的定时器有以下特征

具有基本的定时功能，也有PWM输出（灯光控制、电机的转速）、脉冲捕获功能（红外捕捉）。

2个高级控制定时器、10个通用定时器和2个基本定时器

高级控制定时器（TIM1和TIM8）

　　具有16位定时器功能，也具有PWM输出高级控制功能

通用定时器（TIM2到TIM5）

　　具有16位定时功能，也具有PWM输出控制功能

通用定时器（TIM9到TIM14）

　　具有16位定时功能，也具有PWM输出控制功能

基本定时器（TIM6和TIM7）

　　具有16位定时功能

二、定时器初始化

1. 选择时钟源，并初始化定时器分频值与定时时间

/* TIM3 clock enable ，定时器3时钟使能*/

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

/* Time base configuration ，定时器基本配置*/

TIM_TimeBaseStructure.TIM_Period = (/)-;                           //定时时间的设置[非常重要],中断频率为1000Hz，也就是定时时间为1ms

TIM_TimeBaseStructure.TIM_Prescaler = 8400-1;                             //预分频值

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;              //时钟分频，也称之为二次分频,当前是1分频，说白了不分频，不降低频率

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;        //向上计数的方法

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);                               //初始化

涉及部分寄存器参考如下

1. 中断的配置

/* TIM Interrupts enable,使能定时器3更新中断事件，也代表说定时已经到达的事件 */

TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

/* TIM3 enable counter，使能定时器3工作 */

TIM_Cmd(TIM3, ENABLE);

2. 中断服务函数的编写

void TIM3_IRQHandler(void)

{

         static uint32_t cnt=;

         //是否已经有更新中断事件

         if (TIM_GetITStatus(TIM3, TIM_IT_Update) == SET)

         {

                   //添加用户代码

                   cnt++;

                   if(cnt>=)

                   {

                            cnt =;

                            PFout()^=;

                   }

                   //清空标志位，告诉CPU我已经完成中断处理

                   TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

         }

}

TIM3

#include <stdio.h>

#include "stm32f4xx.h"

#include "sys.h"

GPIO_InitTypeDef            GPIO_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

NVIC_InitTypeDef         NVIC_InitStructure;

void tim3_init(void)

{

    /* TIM3 clock enable ，定时器3时钟使能*/

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    /* Enable the TIM3 gloabal Interrupt ，使能定时器3全局中断*/

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    /* Time base configuration ，定时器基本配置*/

    TIM_TimeBaseStructure.TIM_Period = (/)-;            //定时时间的设置[非常重要],中断频率为1000Hz，也就是定时时间为1ms

    TIM_TimeBaseStructure.TIM_Prescaler = -;                //预分频值

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;        //时钟分频，也称之为二次分频,当前是1分频，说白了不分频，不降低频率

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;    //向上计数的方法

    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);                //初始化

    /* TIM Interrupts enable,使能定时器3更新中断事件，也代表说定时已经到达的事件 */

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

    /* TIM3 enable counter，使能定时器3工作 */

    TIM_Cmd(TIM3, ENABLE);

}

int main(void)

{

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);

    /* 配置PF9引脚为输出模式 */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;                    //第9根引脚

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;                //设置输出模式

    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;                //推挽模式，增加驱动电流

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;            //设置IO的速度为100MHz，频率越高性能越好，频率越低，功耗越低

    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;            //不需要上拉电阻

    GPIO_Init(GPIOF, &GPIO_InitStructure);

    PFout()=;

    //定时器3初始化

    tim3_init();

    while()

    {

    }

}

void TIM3_IRQHandler(void)

{

    static uint32_t cnt=;

    //是否已经有更新中断事件

    if (TIM_GetITStatus(TIM3, TIM_IT_Update) == SET)

    {

        //添加用户代码

        cnt++;

        if(cnt>=)

        {

            cnt =;

            PFout()^=;

        }

        //清空标志位，告诉CPU我已经完成中断处理

        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

    }

}

tim1238_irq

#include "stm32f4xx.h"

#include "stdio.h"

#include "bitband.h"

GPIO_InitTypeDef GPIO_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

NVIC_InitTypeDef NVIC_InitStructure;

void tim1_init(void)

{

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_TIM10_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    //定时时间为100ms  168000000/16800=10000Hz

    TIM_TimeBaseStructure.TIM_Period = (/)-;

    TIM_TimeBaseStructure.TIM_Prescaler = -;

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM1, ENABLE);

}

void tim2_init(void)

{

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    //定时时间为200ms 84000000/84000=10000Hz

    TIM_TimeBaseStructure.TIM_Period = (/)-;

    TIM_TimeBaseStructure.TIM_Prescaler = -;

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM2, ENABLE);

}

void tim3_init(void)

{

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    //定时时间为500ms 84000000/84000=10000Hz

    TIM_TimeBaseStructure.TIM_Period = (/)-;

    TIM_TimeBaseStructure.TIM_Prescaler = -;

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM3, ENABLE);

}

void tim8_init(void)

{

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM8_UP_TIM13_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    //定时时间为2秒  168000000/168000=10000Hz

    TIM_TimeBaseStructure.TIM_Period = (*)-;

    TIM_TimeBaseStructure.TIM_Prescaler = -;

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM8, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM8, ENABLE);

}

int main(void)

{

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF | RCC_AHB1Periph_GPIOE, ENABLE);

    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9|GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;

    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

    GPIO_Init(GPIOF, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_13|GPIO_Pin_14;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;

    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

    GPIO_Init(GPIOE, &GPIO_InitStructure);

    PFout() = ;

    PFout() = ;

    PEout() = ;

    PEout() = ;

    tim1_init();

    tim2_init();

    tim3_init();

    tim8_init();

    while()

    {    

    }

}

void TIM1_UP_TIM10_IRQHandler(void)

{

    if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)

    {

        PFout() ^= ;

        TIM_ClearITPendingBit(TIM1, TIM_IT_Update);

    }

}

void TIM2_IRQHandler(void)

{

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

    {

        PFout() ^= ;

        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

    }

}

void TIM3_IRQHandler(void)

{

    if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)

    {

        PEout() ^= ;

        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

    }

}

void TIM8_UP_TIM13_IRQHandler(void)

{

    if (TIM_GetITStatus(TIM8, TIM_IT_Update) != RESET)

    {

        PEout() ^= ;

        TIM_ClearITPendingBit(TIM8, TIM_IT_Update);

    }

}

巴特西