stm32f103rc软件开发 (4) Timer定时器操作

stm32

keil

主函数如下，是一个简单的例子，定时切换IO口输出int main(void){   /* System Clocks Configuration */ RCC_Configuration(); /* Configure the GPIO ports */ GPIO_Configuration(); TIM_NVIC( ); TIM_Configuration(); TIM_Enable(); while(1) {    GPIO_SetBits(GPIOB, GPIO_Pin_12 ); //打开     DelaySec(1);    GPIO_ResetBits(GPIOB, GPIO_Pin_12); //关闭    DelaySec(1);}

RCC配置void RCC_Configuration(void){  /* Setup the microcontroller system. Initialize the Embedded Flash Interface,       initialize the PLL and update the SystemFrequency variable. */  SystemInit();      /* Enable GPIOx clock */  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB，ENABLE);  //用到B12做输出打开GPIOB  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);     //定时器中断}此处就是打开TIM2  和GPIOB的时钟

GPIO配置void GPIO_Configuration(void){  GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_12;     //LED GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure);}用GPIOB 12做LED灯的控制管脚

TIM的配置//定时为1秒，1秒溢出  void TIM_Configuration(void){TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;// /* 基础设置*/  72M除以7200分频后每10000次为1秒。TIM_TimeBaseStructure.TIM_Period = 10000-1; //计数值   TIM_TimeBaseStructure.TIM_Prescaler = 7200-1;     //预分频,此值+1为分频的除数TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;   //TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);/* TIM2 enable counter */    TIM_Cmd(TIM2, ENABLE);}void TIM_NVIC(void){ NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}void TIM_Enable(void){  /*预先清除所有中断位*/ TIM_ClearITPendingBit(TIM2,TIM_IT_Update);  /* 4个通道和溢出都配置中断*/ TIM_ITConfig(TIM2,TIM_IT_Update, ENABLE);}此处配置TIM2的各种模式。

定时函数的实现volatile  u32 sec = 0;   为全局变量void onesec(void){   if (TIM_GetITStatus(TIM2,TIM_IT_Update) != RESET)     {       TIM_ClearITPendingBit(TIM2,TIM_IT_Update);       sec++;    }}//定时的秒函数   count为传入的秒数void DelaySec(int count){    sec = 0;    while(count > sec);}

TIM 2 中断函数的实现   stm32f10x_it.c文件中void TIM2_IRQHandler(void){   onesec(); }