TIM3捕获配置时，只要一NVIC_Init使能中断就卡死，咨询下大家

只看该作者 · 2023-12-1 15:15

STM32F103ZET6板子，想用TIM3_CH2来捕获TIM8 CH3输出的pwm，为此将pwm TIM8_CH3输出的管脚PC8 和 TIM3_CH2管脚PA7 连起来后，发现程序执行不下去了（不连起来就能执行）。卡死了好像。请帮看下可能原因。

做过的尝试：
1、自己把TIM3 CH2的优先级改成最高（抢占优先级为0，响应优先级也为0），也不行。
2、PC8 和 TIM3_CH2管脚PA7 连线去除，发现程序能执行下去
3、中断不使能，就是不执行Nvic_init也可以执行下去，说明肯定是和中断相关。

TIM3_CH2初始化的代码：

void InitFan3InletFG(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

//初始化GPIO复用
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
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_TIM3, 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;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* IC2,上升沿触发 TI2FP2 */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
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(TIM3, &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(TIM5, &TIM_ICInitStructure);
#endif

TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM3,TIM_MasterSlaveMode_Enable);

TIM_Cmd(TIM3, ENABLE);

//使能CC2捕获中断，主
//// TIM_ClearITPendingBit(TIM3, TIM_IT_CC2); //20231130 1101: try add this
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);

//使能中断
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //3; //0; //1; // 3;  //20231130pm5 try modified to 1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
/////// NVIC_Init(&NVIC_InitStructure); ///////1130pm15: disable try
NVIC_Init(&NVIC_InitStructure);
}
中断处理代码：

void TIM3_IRQHandler(void)
{
Timer3ISR();
}

void Timer3ISR(void)
{
int ret;

g_tim3Count++;

if (g_tim3Count % 100 == 0) {

      //printf("timer3 got\r\n");
}

TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);
TIM_ClearITPendingBit(TIM3, TIM_IT_CC4);

//TIM3, CH2通道
ret = TIM_GetFlagStatus(TIM3, TIM_FLAG_CC2);
if (ret)
{
      TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
      Tim3Ch2Isr();
}

//TIM3, CH1通道
ret = TIM_GetFlagStatus(TIM3, TIM_FLAG_CC1);
if (ret)
{
      TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
      Tim3Ch1Isr();
}

//TIM3, CH3通道
ret = TIM_GetFlagStatus(TIM3, TIM_FLAG_CC3);
if (ret)
{
      TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);
      Tim3Ch3Isr();
}

//TIM3, CH4通道
ret = TIM_GetFlagStatus(TIM3, TIM_FLAG_CC4);
if (ret)
{
      TIM_ClearITPendingBit(TIM3, TIM_IT_CC4);
      Tim3Ch4Isr();
}
}

只看该作者 · 2023-12-4 09:14

STM32的捕获用过，挺好用的，不过没用过你这种把2个脚接起来的做法，用的是外接一个信号，去捕获，程序是用cube生成的，你可以试一下，网上一堆教程

TIM3捕获配置时，只要一NVIC_Init使能中断就卡死，咨询下大家

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