调stm32 的输入捕获求助

yinyongqoin · 发表于 2015-9-14 11:26:05

调stm32 的输入捕获，一直不行，中断有问题，删除定时器中断，就没问题。没删除配置完中断就会死机；
代码如下：

[mw_shl_code=c,true]TIM_ICInitTypeDef TIM2_ICInitStructure; void PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); GPIO_PinRemapConfig(GPIO_FullRemap_TIM2,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_ResetBits(GPIOB,GPIO_Pin_11); TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler = psc; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); TIM2_ICInitStructure.TIM_Channel = TIM_Channel_4; TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 TIM_ICInit(TIM2, &TIM2_ICInitStructure); NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); TIM_ITConfig(TIM2, TIM_IT_Update | TIM_IT_CC4, ENABLE); TIM_Cmd(TIM2, ENABLE); } void TIM2_IRQHandler(void) { if((TIM2CH1_CAPTURE_STA&0X80)==0) { if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) { if(TIM2CH1_CAPTURE_STA&0X40) { if((TIM2CH1_CAPTURE_STA&0X3F) == 0X3F){ TIM2CH1_CAPTURE_STA |= 0X80; TIM2CH1_CAPTURE_VAL = 0XFFFF; } else TIM2CH1_CAPTURE_STA++; } } if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET) { if(TIM2CH1_CAPTURE_STA&0X40) { TIM2CH1_CAPTURE_STA |= 0X80; TIM2CH1_CAPTURE_VAL = TIM_GetCapture4(TIM2); TIM_OC4PolarityConfig(TIM2,TIM_ICPolarity_Rising); } else { TIM2CH1_CAPTURE_STA = 0; TIM2CH1_CAPTURE_VAL = 0; TIM_SetCounter(TIM2,0); TIM2CH1_CAPTURE_STA |= 0X40; TIM_OC4PolarityConfig(TIM2,TIM_ICPolarity_Falling); } } } TIM_ClearITPendingBit(TIM2, TIM_IT_CC4|TIM_IT_Update); }[/mw_shl_code]

c8t6 的MCU，按键是PB11，用tim2的复用通道4，刚好对应PB11。是不是输入捕获不可以用复用ＩＯ口啊？