外部中断和定时器中断问题

ycgxy1650601 · 发表于 2018-4-2 17:36:43

本帖最后由 ycgxy1650601 于 2018-4-2 20:29 编辑

单片机板：STM32F1精英版;
外部中断1：IO口为PC1;初始化程序为EXIT_Init();
定时器3：IO口为PB1;初始化程序为TIM3_PWM_Init();
问题描述：EXIT_Init() 和 TIM3_PWM_Init() 两个函数在程序中互为前后，结果不一样；
1.EXIT_Init() 在 TIM3_PWM_Init() 前面，外部中断和定时器中断都能实现；
2.EXIT_Init() 在 TIM3_PWM_Init() 后面，外部中断不能实现，定时器中断能实现；(更改抢占和响应优先级没有效果)
为什么会出现这种情况，有遇到的给点提示呗。

注意：代码见四楼

Electronic · 发表于 2018-4-2 17:36:44

你把时钟打开，另外就是需要注意就是结构体变量是否全部初始化，如果没有初始化有出现莫名奇妙的问题

哆啦A萌 · 发表于 2018-4-2 17:39:46

NO CODE SAY JB?

login_FAE · 发表于 2018-4-2 18:36:02

初始化代码帖出来看下

ycgxy1650601 · 发表于 2018-4-2 19:52:14

本帖最后由 ycgxy1650601 于 2018-4-3 09:17 编辑

login_FAE 发表于 2018-4-2 18:36
初始化代码帖出来看下

//PC1初始化(忘了贴出来了)
void GPIO_Init1(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_SetBits(GPIOC,GPIO_Pin_1);
}

void TIM3_IRQHandler()
{
      long temp;
      if(TIM_GetITStatus(TIM3,TIM_FLAG_Update)!=RESET)
      {
            ...省略
            TIM_ClearITPendingBit(TIM3,TIM_FLAG_Update);
      }
}

void TIM3_PWM_Init()
{
      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB  | RCC_APB2Periph_AFIO, ENABLE);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      GPIO_ResetBits(GPIOB,GPIO_Pin_0);

      TIM_TimeBaseStructure.TIM_Period = 11;
      TIM_TimeBaseStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

      TIM_UpdateRequestConfig(TIM3,TIM_UpdateSource_Regular);
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
      TIM_OCInitStructure.TIM_Pulse = 6;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
      TIM_OC4Init(TIM3, &TIM_OCInitStructure);

      TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
      TIM_ARRPreloadConfig(TIM3, ENABLE);
      TIM_ITConfig(TIM3, TIM_IT_Update ,ENABLE);

      NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

//       TIM_Cmd(TIM3, ENABLE);  //在其他函数中打开定时器
}

void EXIT_Init()
{
      EXTI_InitTypeDef EXTI_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

      GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource1);
      EXTI_InitStructure.EXTI_Line=EXTI_Line1;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
      EXTI_Init(&EXTI_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}

void EXTI1_IRQHandler(void)
{
      delay_ms(10);
      if(EXTI_GetITStatus(EXTI_Line1) != RESET)
            if(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_1)!=0)
            {
                     ...此处省略
            }
      EXTI_ClearITPendingBit(EXTI_Line1);
}

int main(void)
{
      SystemInit();
      delay_init();
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      LED_Init();
      GPIO_Init1();
      EXIT_Init();
      TIM3_PWM_Init();
//       EXIT_Init();
      Variable_Init();

      pwm_fun(200,600);
      while(1)
      {
            move(3200,200);
            dendai();
            delay_ms(300);
      }
}