[问答]

用STM32cube配置TIM1捕获模式，启动定时器后无法修改psc和arr寄存器，修改之后定时器还按照原来的参数计数

问答对人有帮助，内容完整，我也想知道答案 0 tiM1捕获模式正常工作后，用__HAL_TIM_SET_PRESCALER(&htim1,psc);函数修改psc；__HAL_TIM_SET_AUTORELOAD（）函数设置定时周期，修改后没有按照新的参数计数； int main(void) { /* USER CODE BEGIN 1 / unsigned short psc = 143; / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_USART1_UART_Init(); MX_TIM1_Init(); / USER CODE BEGIN 2 / printf("³õÊ¼»¯...n"); HAL_TIM_Base_Start_IT(&htim1); HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_4)==GPIO_PIN_RESET) { HAL_Delay(20); if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_4)==GPIO_PIN_RESET) { printf("°´¼ü°´ÏÂ£¡n"); // cap_time = 1; // HAL_TIM_IC_Start_IT(&htim1,TIM_CHANNEL_1); //HAL_TIM_IC_Start(&htim5,TIM_CHANNEL_1); psc = psc - 10; if(psc < 20) { psc = 143; } __HAL_TIM_SET_PRESCALER(&htim1,psc); } while(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_4)==GPIO_PIN_RESET); } if(fre.flag == 1) { printf("fre = %fn",fre.result); fre.result = 0; fre.flag = 0; } } / USER CODE END 3 / } 复制代码* void MX_TIM1_Init(void) { TIM_ClockConfigTypeDef sClockSourceConfig = {0}; TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_IC_InitTypeDef sConfigIC = {0}; htim1.Instance = TIM1; htim1.Init.Prescaler = 143; htim1.Init.CounterMode = TIM_COUNTERMODE_UP; htim1.Init.Period = 50000; htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim1.Init.RepetitionCounter = 0; htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE; if (HAL_TIM_Base_Init(&htim1) != HAL_OK) { Error_Handler(); } sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK) { Error_Handler(); } if (HAL_TIM_IC_Init(&htim1) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING; sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI; sConfigIC.ICPrescaler = TIM_ICPSC_DIV1; sConfigIC.ICFilter = 0; if (HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_1) != HAL_OK) { Error_Handler(); } } 复制代码 void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef htim) { if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_9) == GPIO_PIN_SET) { if(fre.times == 1) { //cap_value1 = HAL_TIM_ReadCapturedValue(&htim1,TIM_CHANNEL_1); fre.times = 2; fre.period = 0; __HAL_TIM_SET_COUNTER(&htim1,0); // Çå³ýÖÐ¶Ï±êÖ¾Î» __HAL_TIM_CLEAR_IT(&htim1, TIM_IT_CC1); HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1); printf("µÚÒ»¸öÉÏÉýÑØ£¬fre.period = %dn",fre.period); } else { fre.velue = HAL_TIM_ReadCapturedValue(&htim1,TIM_CHANNEL_1); fre.times = 1; //HAL_TIM_IC_Stop_IT(&htim1, TIM_CHANNEL_1); __HAL_TIM_CLEAR_IT(&htim1, TIM_IT_CC1); HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1); printf("µÚ¶þ¸öÉÏÉýÑØ£¬fre.period = %dn",fre.period); fre.result = 1000000.0 / (fre.velue + fre.period 1000); fre.period = 0; fre.flag = 1; } } } 复制代码 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef htim) { / USER CODE BEGIN Callback 0 / / USER CODE END Callback 0 / if (htim->Instance == TIM6) { HAL_IncTick(); } / USER CODE BEGIN Callback 1 / if (htim->Instance == TIM1) { } fre.period++; / USER CODE END Callback 1 / } 复制代码* 0 已退回1积分
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