stm32定时器中断问题

Bolten · 发表于2014-10-22 09:42

stm32定时器中断问题 [复制链接]

本帖最后由 Bolten 于 2014-10-22 09:55 编辑

我用串口调试程序，想做精准1sLED亮灭，可以进串口中断，进不去定时器中断，急求！！！各位大师求指点
void BSP_Init (void)
{
      RCC_Configuration();
      GPIO_Configuration();
      EXTI_Configuration();
      NVIC_Configuration();
      USART1_Configuration();
  TIM2_Configuration();
}

void RCC_Configuration(void)
{
      SystemInit();
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA| RCC_AHB1Periph_GPIOB| RCC_AHB1Periph_GPIOC
                                                      , ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1| RCC_APB2Periph_TIM1| RCC_APB2Periph_TIM8|
                                                   RCC_APB2Periph_TIM9|RCC_APB2Periph_SYSCFG, ENABLE);
      RCC_APB1PeriphClockCmd(  RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3 | RCC_APB1Periph_TIM4
                           |RCC_APB1Periph_TIM5, ENABLE);

}
void GPIO_Configuration(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
      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_NOPULL;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

}

void USART1_Configuration(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOA,&GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
      GPIO_Init(GPIOA,&GPIO_InitStructure);

  USART_InitStructure.USART_BaudRate=115200;
  USART_InitStructure.USART_Parity=USART_Parity_No;
  USART_InitStructure.USART_WordLength=USART_WordLength_8b;
  USART_InitStructure.USART_StopBits=USART_StopBits_1;
  USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
  USART_Init(USART1, &USART_InitStructure);
      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
      USART_Cmd(USART1, ENABLE);
}

void TIM2_Configuration(void)
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

      TIM_TimeBaseStructure.TIM_Period =2000;
      TIM_TimeBaseStructure.TIM_Prescaler = (42000-1);
      TIM_TimeBaseStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

      TIM_ClearFlag(TIM2,TIM_FLAG_Update);
      TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
      TIM_Cmd(TIM2, ENABLE);
}

void NVIC_Configuration(void)
{
  NVIC_InitTypeDef       NVIC_InitStructure;
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

      NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

}
void USART1_IRQHandler(void)
{
      if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET);
            USART_ClearFlag(USART1, USART_FLAG_RXNE);

}
void TIM2_IRQHandler(void)
{

      if(TIM_GetITStatus(TIM2,TIM_IT_Update)!= RESET)    //判断中断发生与否
               {
                     USART_OUT(USART1," AAAAA\r\n");
                     GPIO_ToggleBits(GPIOB,GPIO_Pin_12);
                     TIM_ClearITPendingBit(TIM2,TIM_FLAG_Update);
               }
}

int  main(void)                                                                      //主函数
{
      BSP_Init();
            SCB->VTOR = FLASH_BASE | 0x20000;

USART_OUT(USART1," *************\r\n");
            USART_OUT(USART1, "******************\r\n");
            GPIO_ResetBits(GPIOB,GPIO_Pin_12);

return  0;
}

huo_hu · 发表于2014-10-22 13:12

看程序的感受都是一样的.

Bolten · 发表于2014-10-22 13:17

huo_hu 发表于 2014-10-22 13:12
看程序的感受都是一样的.

我的哪里有问题，求指导

EETUX · 发表于2014-10-22 13:51

其中可能的问题之一是楼主的main函数很快得就返回了.

caojuxian1212 · 发表于2014-10-22 15:07

既然是定时中断你的主函数要停下来等这个中断到来，增加一个while循环

huo_hu · 发表于2014-10-22 17:54

TIM_TimeBaseStructure.TIM_Prescaler = (42000-1);
这个数太大了吧,你cnt有没有走?

laidaihua · 发表于2014-10-24 15:42

第一个问题：
main()函数中没有while(1);

第二个问题：
TIM2的Prescaler值设置错误，不能大于255。。

stm32定时器中断问题 [复制链接]

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