[应用相关] STM32学习笔记：通用定时器基本定时功能

#include "stm32f10x_lib.h"



void RCC_cfg();



void TIMER_cfg();



void NVIC_cfg();



void GPIO_cfg();



int main()



{



RCC_cfg();



NVIC_cfg();



GPIO_cfg();



TIMER_cfg();



//开启定时器2



TIM_Cmd(TIM2,ENABLE);



while(1);



}



void RCC_cfg()



{



//SystemInt中已经定义位72MHz



//允许TIM2的时钟



RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);



//允许GPIO的时钟



RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);



}



void TIMER_cfg()



{



TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;



//重新将Timer设置为缺省值



TIM_DeInit(TIM2);



//采用内部时钟给TIM2提供时钟源



TIM_InternalClockConfig(TIM2);



//预分频系数为36000-1，这样计数器时钟为72MHz/36000 = 2kHz



TIM_TimeBaseStructure.TIM_Prescaler = 36000 - 1;



//设置时钟分割



TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;



//设置计数器模式为向上计数模式



TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;



//设置计数溢出大小，每计2000个数就产生一个更新事件



TIM_TimeBaseStructure.TIM_Period = 2000 - 1;



//将配置应用到TIM2中



TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);



//清除溢出中断标志



TIM_ClearFlag(TIM2, TIM_FLAG_Update);



//禁止ARR预装载缓冲器



TIM_ARRPreloadConfig(TIM2, DISABLE);



//开启TIM2的中断



TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);



}



void NVIC_cfg()



{



NVIC_InitTypeDef NVIC_InitStructure;



//选择中断分组1



NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);



//选择TIM2的中断通道



NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;



//抢占式中断优先级设置为0



NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;



//响应式中断优先级设置为0



NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;



//使能中断



NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;



NVIC_Init(&NVIC_InitStructure);



}



void GPIO_cfg()



{



GPIO_InitTypeDef GPIO_InitStructure;



GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //选择引脚5



GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //输出频率最大50MHz



GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //带上拉电阻输出



GPIO_Init(GPIOB,&GPIO_InitStructure);



}

void TIM2_IRQHandler(void)

{

u8 ReadValue;

//检测是否发生溢出更新事件

if(TIM_GetITStatus(TIM2,

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

{

//清除TIM2的中断待处理位

TIM_ClearITPendingBit(TIM2 , TIM_FLAG_Update);

//将PB.5管脚输出数值写入ReadValue

ReadValue = GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_5);

if(ReadValue == 0)

{

GPIO_SetBits(GPIOB,GPIO_Pin_5);

}

else

{

GPIO_ResetBits(GPIOB,GPIO_Pin_5);

}

}

}