脉冲捕获，用TIM2_CH1可以，但是用TIM3_CH4就不行了。求助啊。。。。

ndzhzsdw · 发表于 2015-7-1 23:20:20

[mw_shl_code=c,true]这是TIM2_CH1的，完全可以用。[/mw_shl_code] [mw_shl_code=c,true]/** * @brief TIM2_CAP_Init * @param arr: This parameter must be a number between 0x0000 and 0xFFFF. * @param prescaler: This parameter can be a number between 0x0000 and 0xFFFF; * @retval None */ void TIM2_CAP_Init(u16 arr, u16 prescaler) { GPIO_InitTypeDef GPIO_InitStruct; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; TIM_ICInitTypeDef TIM_ICInitStruct; NVIC_InitTypeDef NVIC_InitStruct; // 开启TIM2和GPIOA的时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // PA0初始化 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPD; // 设置为下拉输入 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; GPIO_Init(GPIOA, &GPIO_InitStruct); // TIM2定时器初始化 TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Down; TIM_TimeBaseInitStruct.TIM_Period = arr; TIM_TimeBaseInitStruct.TIM_Prescaler = prescaler; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct); // TIM2_CH1输入捕获初始化 TIM_ICInitStruct.TIM_Channel = TIM_Channel_1; TIM_ICInitStruct.TIM_ICFilter = 0x00; // 不滤波 TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising; // 上升沿捕获 TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1; // 输入分频器不分频 TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI; // 映射到IC1 TIM_ICInit(TIM2, &TIM_ICInitStruct); // 中断分组初始化 NVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_Init(&NVIC_InitStruct); TIM_ITConfig(TIM2, TIM_IT_Update|TIM_IT_CC1, ENABLE); // 更新中断和CC1IE捕获中断 TIM_Cmd(TIM2, ENABLE); } //定时器5中断服务程序 void TIM2_IRQHandler(void) { if(TIM_GetFlagStatus(TIM2, TIM_FLAG_CC1) != RESET) // 边沿捕获触发标志触发 { pluse_cnt ++; } TIM_ClearFlag(TIM2, TIM_FLAG_CC1); // 清除状态标志 TIM_ClearITPendingBit(TIM2, TIM_IT_Update); // 清除中断标志位 } [/mw_shl_code]

这是TIM3_CH4，就不能使用了。

[mw_shl_code=c,true]/** * @brief TIM3_CAP_Init * @param arr: This parameter must be a number between 0x0000 and 0xFFFF. * @param prescaler: This parameter can be a number between 0x0000 and 0xFFFF; * @retval None */ void TIM3_CAP_Init(u16 arr, u16 prescaler) { GPIO_InitTypeDef GPIO_InitStruct; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; TIM_ICInitTypeDef TIM_ICInitStruct; NVIC_InitTypeDef NVIC_InitStruct; // 开启TIM3和GPIOB的时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // PB1初始化 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPD; // 设置为下拉输入 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1; GPIO_Init(GPIOB, &GPIO_InitStruct); // TIM3定时器初始化 TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Down; TIM_TimeBaseInitStruct.TIM_Period = arr; TIM_TimeBaseInitStruct.TIM_Prescaler = prescaler; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct); // TIM3_CH4输入捕获初始化 TIM_ICInitStruct.TIM_Channel = TIM_Channel_4; TIM_ICInitStruct.TIM_ICFilter = 0x00; // 不滤波 TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising; // 上升沿捕获 TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1; // 输入分频器不分频 TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI; // 映射到IC1 TIM_ICInit(TIM3, &TIM_ICInitStruct); // 中断分组初始化 NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_Init(&NVIC_InitStruct); TIM_ITConfig(TIM3, TIM_IT_Update|TIM_IT_CC4, ENABLE); // 更新中断和CC1IE捕获中断 TIM_Cmd(TIM3, ENABLE); } //定时器3中断服务程序 void TIM3_IRQHandler(void) { if(TIM_GetFlagStatus(TIM3, TIM_FLAG_CC4) != RESET) // 边沿捕获触发标志触发 { pluse_cnt ++; } TIM_ClearFlag(TIM3, TIM_FLAG_CC4); // 清除状态标志 TIM_ClearITPendingBit(TIM3, TIM_IT_Update); // 清除中断标志位 }[/mw_shl_code]

仿真查看TIM3的寄存器，有中断发生，但是CCR4通道一直为0，这很不正常啊，不知道怎么回事，请问有大虾指教一下吗，或者有没有遇到和我一样情况的？