本帖最后由 bsaver 于 2014-6-27 16:10 编辑
大家好，我使用TIM1重映射后 利用OC2在 PE.11 管脚输出PWM，使用 PE.3配置外部中断，发现对PE3输入标准的方波信号（由示波器测试信号输入，保证无干扰），PE3浮空输入 带10K上拉电阻，在中断里面做数据累加，无其他操作指令，发现上电1~2秒内中断次数就能上万，请问这是哪里的问题？源代码如下：
- void TIMx_PwmInit(void)
- {
- TIM_OCInitTypeDef TIM_OCInitStruct;
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- //TIM1 Periph clock enable
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //定时器1时钟使能，1分频，72M
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOE, &GPIO_InitStructure);
-
- /* TIM1 Full remapping pins */
- GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);
- TIM_DeInit(TIM1); //重新将Timer设置为缺省值
- TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
- TIM_TimeBaseStructure.TIM_Prescaler = (72 - 1); //psc 设置预分频数 72M/72 = 1000 KHz
- TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD; //设置自动装载寄存器 1000 KHz / (period + 1) = 每秒钟中断次数
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //=0x0000 设置时间分割值
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //选择向上计数
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
- /* Set the default configuration */
- TIM_OCStructInit(&TIM_OCInitStruct);
- TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM2; //PWM1模式
- TIM_OCInitStruct.TIM_Pulse = PWM1_PULSE; //
- TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; //信号输出到对应的输出引脚
- TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Set;
- TIM_OC2Init(TIM1, &TIM_OCInitStruct);
- TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
- TIM_ARRPreloadConfig(TIM1, ENABLE);
- TIM_CtrlPWMOutputs(TIM1, ENABLE); //使能PWM输出
- TIM_Cmd(TIM1, ENABLE); //使能定时器
- }
- void ExGPIO_Config(void)
- {
- EXTI_InitTypeDef EXTI_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- /* Enable GPIOE clock */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
-
- /* Configure PE.03 pin as input floating */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //GPIO_Mode_IN_FLOATING;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_Init(GPIOE, &GPIO_InitStructure);
-
- /* Enable AFIO clock */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
-
- /* Connect EXTI3 Line to PE.03 pin */
- EXTI_ClearITPendingBit(EXTI_Line3);
- GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource3);
- /* Configure EXTI3 line */
- EXTI_InitStructure.EXTI_Line = EXTI_Line3;
- EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
- EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //EXTI_Trigger_Rising_Falling
- EXTI_InitStructure.EXTI_LineCmd = ENABLE;
- EXTI_Init(&EXTI_InitStructure);
- /* Enable and set EXTI3 Interrupt to the lowest priority */
- NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] This function handles External line 3 interrupt request.
- * @param None
- * @retval None
- */
- void EXTI3_IRQHandler(void)
- {
- if(EXTI_GetITStatus(EXTI_Line3) != RESET)
- {
- if(numInterrupt) numInterrupt--;
- // numInterrupt--;
- /* Clear the EXTI line 3 pending bit */
- EXTI_ClearITPendingBit(EXTI_Line3);
- }
- }
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