本来是PC6是外部来的一个脉冲信号，PC7想输出个相位相反的信号。
想着把PC6设为上升/下降沿中断，然后在中断里判断PC6的状态，以此决定PC7输出是高或低。
结果PC7引脚始终是低电平。已排除PC7引脚配置错误的可能，用定时器中断使PC7一秒反转一次，波形是正常的。
然后就改PC6为上升沿中断，中断里将PC7反转一次。结果PC7仍未低电平。
求坛友看看PC6的配置程序和中断程序，是否有问题？
PC6配置程序：
- void PC6_ExintConfig(void)
- {
- EXTI_InitTypeDef EXTI_InitStructure;
- GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource6);
- EXTI_InitStructure.EXTI_Line = EXTI_Line6;
- EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
- EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
- EXTI_InitStructure.EXTI_LineCmd = ENABLE;
- EXTI_Init(&EXTI_InitStructure);
- }
- oid NVIC_Configuration(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
-
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
- NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
- NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- void EXTI9_5_IRQHandler(void)
- {
- if(EXTI_GetITStatus(EXTI_Line6) != RESET)
- {
- GPIOC->ODR ^= GPIO_Pin_7;
- GPIOA->ODR ^= GPIO_Pin_1;
- EXTI_ClearITPendingBit(EXTI_Line6);
- }
- }
- void GPIO_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 |GPIO_Pin_2;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
-
- PC6_ExintConfig();
- }
| 
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