TIM5捕获4个通道都没有值，怀疑没有进入中断

Question

用STM32F103ZET6的TIM8输出4路PWM，并用TIM5来捕获，现在现象是TIM8的4个寄存器已经配置了，但是捕获的值是0，怀疑没有进入中断，请大家帮看下，谢谢

TIM5初始的代码：

//20231128：尝试TIM5 4个通道一起初始化
void TIM5CapInit(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_ICInitTypeDef  TIM_ICInitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    //使能GPIOA时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //初始化定时器
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 0xFFFF-1;
    TIM_TimeBaseStructure.TIM_Prescaler = 72-1; //1us,总时间65ms
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    //printf("444 InitFan1OutletFGTIM5CapInit, line %d\r\n", __LINE__);
    TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);

    /* IC2,上升沿触发 TI2FP2 */
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_3 | TIM_Channel_4 | TIM_Channel_2 | TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0;
    TIM_PWMIConfig(TIM5, &TIM_ICInitStructure);
#if 0
    /* IC2, 下降沿触发，TI2FP1*/
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_IndirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0;
    TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
#endif

    TIM_SelectInputTrigger(TIM5, TIM_TS_TI2FP2);
    TIM_SelectSlaveMode(TIM5, TIM_SlaveMode_Reset);
    TIM_SelectMasterSlaveMode(TIM5,TIM_MasterSlaveMode_Enable);

    TIM_Cmd(TIM5, ENABLE);

    //使能CC捕获中断，主
    TIM_ITConfig(TIM5, TIM_IT_CC3, ENABLE);
    TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);
    TIM_ITConfig(TIM5, TIM_IT_CC1, ENABLE);
    TIM_ITConfig(TIM5, TIM_IT_CC2, ENABLE);

    //使能中断
    NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

中断代码如下：

void Timer5ISR(void)
{
    int ret;

    ret = TIM_GetFlagStatus(TIM5, TIM_FLAG_CC1);
    if (ret)
    {
        TIM_ClearITPendingBit(TIM5, TIM_IT_CC1);
        Tim5Ch1Isr();
    }

    ret = TIM_GetFlagStatus(TIM5, TIM_FLAG_CC2);
    if (ret)
    {
        TIM_ClearITPendingBit(TIM5, TIM_IT_CC2);
        Tim5Ch2Isr();
    }

    ret = TIM_GetFlagStatus(TIM5, TIM_FLAG_CC3);
    if (ret)
    {
        TIM_ClearITPendingBit(TIM5, TIM_IT_CC3);
        Tim5Ch3Isr();
    }

    ret = TIM_GetFlagStatus(TIM5, TIM_FLAG_CC4);
    if (ret)
    {
        TIM_ClearITPendingBit(TIM5, TIM_IT_CC4);
        Tim5Ch4Isr();
    }
}

void Tim5Ch1Isr(void)
{
    IC1Value = TIM_GetCapture1(TIM5);
    if (IC1Value != 0)
    {
        rotateSpeed = (30*1000000)/IC1Value;
    }
}

现在加打印，rotateSpeed的值还是0，没有获取过，

Answer 1

【以下回答由 GPT 生成】

#include "stm32f1xx.h"

void TIM5_IRQHandler(void){
    if (TIM5->SR & TIM_SR_UIF){
        // Timer overflow interrupt
        // handle overflow event here
        TIM5->SR &= ~TIM_SR_UIF; // Clear interrupt flag
    }

    if (TIM5->SR & TIM_SR_CC1IF){
        // Capture/Compare 1 interrupt
        // handle capture event here
        uint32_t capturedValue = TIM5->CCR1; // Get captured value
        TIM5->SR &= ~TIM_SR_CC1IF; // Clear interrupt flag
    }
}

void TIM5_Init(void){
    RCC->APB1ENR |= RCC_APB1ENR_TIM5EN; // Enable TIM5 clock

    TIM5->CR1 |= TIM_CR1_ARPE; // Enable auto-reload preload
    TIM5->CR1 |= TIM_CR1_URS; // Only overflow and update events generate interrupts
    TIM5->DIER |= TIM_DIER_UIE;   // Enable update interrupt

    TIM5->CCMR1 |= TIM_CCMR1_CC1S_0; // CC1 channel is configured as input, IC1 is mapped on TI1
    TIM5->CCER |= TIM_CCER_CC1E; // Capture/Compare 1 output enable
    TIM5->CCER |= TIM_CCER_CC1P; // Capture/compare 1 on the falling edge
    TIM5->CCMR1 |= TIM_CCMR1_IC1F; // Input capture 1 filter

    TIM5->CR1 |= TIM_CR1_CEN; // Enable timer
}

int main(){
    TIM5_Init();

    while(1){
        // Main program loop
    }
}

这是一个初步的TIM5初始化代码，具体问题需要进一步调试和排查。以下是一些可能导致捕获值为0的原因和解决方案：

1. 硬件连接问题：确保TIM5的输入引脚与相应的物理引脚连接正确。

2. 中断使能问题：在主程序中，确保中断向量表已正确配置，并且中断优先级设置正确。

3. NVIC配置问题：在TIM5_Init函数中添加以下代码，以使能TIM5的中断向量和优先级：

cpp NVIC_SetPriority(TIM5_IRQn, 0); // Set interrupt priority (adjust value if necessary) NVIC_EnableIRQ(TIM5_IRQn); // Enable TIM5 interrupt in NVIC

1. 其他配置问题：检查TIM5的其他配置，例如时钟源、预分频器、计数模式等，确保与要求一致。

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