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- 2023-11-28
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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);
-
- 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_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 不使能就可以执行
- NVIC_Init(&NVIC_InitStructure);
- }
复制代码 中断处理函数:
- void TIM3_IRQHandler(void)
- {
- Timer3ISR();
- }
- void Timer3ISR(void)
- {
- int ret;
- g_tim3Count++;
- if (g_tim3Count % 100 == 0) {
- //printf("timer3 got\r\n");
- } //之前调试时想低频率打印,但没有看到这个打印。后来去掉了打印
-
- 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();
- }
- }
复制代码
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