问答

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(); } }