stm32 TIM1 对T1CI脚进行外部脉冲计数，计数正确，进溢出中断时，计数值不对

lzh_321 · 发表于 2015-11-26 13:45:53

[mw_shl_code=c,true]void InitCoder(void) { GPIO_InitTypeDef GPIO_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // 使用定时器，计编码器个数 RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA| RCC_APB2Periph_AFIO, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); // PA8 T1C1 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); // TIM1 中断 NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); // TIM_TimeBaseStructure.TIM_Period = 0xffff; TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler = 0; // 不分频 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); // TIM_ETRClockMode2Config(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0); // 下降沿采样，不滤波 // TIM_ETRClockMode1Config(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted,0); // 下降沿采样，不滤波 TIM_TIxExternalClockConfig(TIM1, TIM_TIxExternalCLK1Source_TI1, TIM_ICPolarity_Rising, 0); TIM_ARRPreloadConfig(TIM1, ENABLE); TIM_ClearITPendingBit(TIM1, TIM_IT_Update); TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE); //开中断 } void TIM1_UP_IRQHandler(void) { if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) { mCODER.cntMux++; TIM_ClearITPendingBit(TIM1, TIM_IT_Update); } }[/mw_shl_code]

如上面代码所示，对T1C1进行外部脉冲计数，用TIM_GetCounter(TIM1)看，计数值是0~arr变化的，但是计数到arr时，不进入 [mw_shl_code=c,true]TIM1_UP_IRQHandler()溢出中断，后面继续计数才可以进入。麻烦看下代码，那里不对，非常感谢[/mw_shl_code]