[问答]

如何获得STM32准确的PWM频率？

问答对人有帮助，内容完整，我也想知道答案 0 我有 Nucleo - STM32F446RE 板，并且一直在尝试使用其上的 PWM（使用 CubeMX）进行电机控制。但出于某种原因，每当我将其设置为 32Khz（而 SYSCLK 为 180Mhz）时，我都会得到 32.8Khz。我检查了我的计算但无济于事。最后我意识到，当我将它设置为 84Mhz 时，我得到了我想要的准确的 32Khz 频率。经过进一步检查，如果我将 SYSCLK 保持为 84，将 APB2 预分频器保持为 /2 并再次为 APB2 定时器保持 2，问题又来了。我意识到它可能不仅仅与 SYSCLK 有关，还与预分频器有关。/2 2 配置导致 32.8Khz 和 /1 1 配置解决了它（对于 84 Mhz），但是在第一个预分频器提供给 APB2 外设并且具有最大 90Mhz，因此它只能使用 /2。该板实际上是我在 80Mhz 上运行的另一块 M4 板的升级，发现它不足以满足我的使用需求，所以我期待 180Mhz。有什么办法可以解决这个问题并同时获得 180Mhz 和准确的 PWM？如果有帮助，我已经在下面粘贴了代码和时钟选项卡。 #include "main.h" tiM_HandleTypeDef htim2; TIM_HandleTypeDef htim5; void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_TIM5_Init(void); static void MX_TIM2_Init(void); int main(void) { / USER CODE BEGIN 1 / / 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_TIM5_Init(); MX_TIM2_Init(); / USER CODE BEGIN 2 / HAL_TIM_PWM_Start(&htim5,TIM_CHANNEL_3); HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / } / USER CODE END 3 / } /* * @brief System Clock Configuration * @retval None / void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /* Configure the main internal regulator output voltage / __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /* Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. / RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 84; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 2; RCC_OscInitStruct.PLL.PLLR = 2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /* Initializes the CPU, AHB and APB buses clocks / RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK\|RCC_CLOCKTYPE_SYSCLK \|RCC_CLOCKTYPE_PCLK1\|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } static void MX_TIM2_Init(void) { / USER CODE BEGIN TIM2_Init 0 / / USER CODE END TIM2_Init 0 / TIM_ClockConfigTypeDef sClockSourceConfig = {0}; TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_OC_InitTypeDef sConfigOC = {0}; / USER CODE BEGIN TIM2_Init 1 / / USER CODE END TIM2_Init 1 / htim2.Instance = TIM2; htim2.Init.Prescaler = 0; htim2.Init.CounterMode = TIM_COUNTERMODE_UP; htim2.Init.Period = 10000-1; htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE; if (HAL_TIM_Base_Init(&htim2) != HAL_OK) { Error_Handler(); } sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK) { Error_Handler(); } if (HAL_TIM_PWM_Init(&htim2) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigOC.OCMode = TIM_OCMODE_PWM1; sConfigOC.Pulse = 2000; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_ENABLE; if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN TIM2_Init 2 / / USER CODE END TIM2_Init 2 / HAL_TIM_MspPostInit(&htim2); } /* * @brief TIM5 Initialization Function * @param None * @retval None / static void MX_TIM5_Init(void) { / USER CODE BEGIN TIM5_Init 0 / / USER CODE END TIM5_Init 0 / TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_OC_InitTypeDef sConfigOC = {0}; / USER CODE BEGIN TIM5_Init 1 / / USER CODE END TIM5_Init 1 / htim5.Instance = TIM5; htim5.Init.Prescaler = 0; htim5.Init.CounterMode = TIM_COUNTERMODE_UP; htim5.Init.Period = 5364; htim5.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim5.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if (HAL_TIM_PWM_Init(&htim5) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim5, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigOC.OCMode = TIM_OCMODE_PWM1; sConfigOC.Pulse = 2182; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_DISABLE; if (HAL_TIM_PWM_ConfigChannel(&htim5, &sConfigOC, TIM_CHANNEL_3) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN TIM5_Init 2 / / USER CODE END TIM5_Init 2 / HAL_TIM_MspPostInit(&htim5); } /* * @brief GPIO Initialization Function * @param None * @retval None / static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; / GPIO Ports Clock Enable / __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /Configure GPIO pin : B1_Pin */ GPIO_InitStruct.Pin = B1_Pin; GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct); } 0
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答案对人有帮助，有参考价值 0 我有 Nucleo - STM32F446RE 板，并且一直在尝试使用其上的 PWM（使用 CubeMX）进行电机控制。但出于某种原因，每当我将其设置为 32Khz（而 SYSCLK 为 180Mhz）时，我都会得到 32.8Khz。我检查了我的计算但无济于事。最后我意识到，当我将它设置为 84Mhz 时，我得到了我想要的准确的 32Khz 频率。经过进一步检查，如果我将 SYSCLK 保持为 84，将 APB2 预分频器保持为 /2 并再次为 APB2 定时器保持 2，问题又来了。我意识到它可能不仅仅与 SYSCLK 有关，还与预分频器有关。/2 2 配置导致 32.8Khz 和 /1 1 配置解决了它（对于 84 Mhz），但是在第一个预分频器提供给 APB2 外设并且具有最大 90Mhz，因此它只能使用 /2。该板实际上是我在 80Mhz 上运行的另一块 M4 板的升级，发现它不足以满足我的使用需求，所以我期待 180Mhz。有什么办法可以解决这个问题并同时获得 180Mhz 和准确的 PWM？如果有帮助，我已经在下面粘贴了代码和时钟选项卡。 #include "main.h" TIM_HandleTypeDef htim2; TIM_HandleTypeDef htim5; void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_TIM5_Init(void); static void MX_TIM2_Init(void); int main(void) { / USER CODE BEGIN 1 / / 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_TIM5_Init(); MX_TIM2_Init(); / USER CODE BEGIN 2 / HAL_TIM_PWM_Start(&htim5,TIM_CHANNEL_3); HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / } / USER CODE END 3 / } /* * @brief System Clock Configuration * @retval None / void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /* Configure the main internal regulator output voltage / __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /* Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. / RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 84; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 2; RCC_OscInitStruct.PLL.PLLR = 2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /* Initializes the CPU, AHB and APB buses clocks / RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK\|RCC_CLOCKTYPE_SYSCLK \|RCC_CLOCKTYPE_PCLK1\|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } static void MX_TIM2_Init(void) { / USER CODE BEGIN TIM2_Init 0 / / USER CODE END TIM2_Init 0 / TIM_ClockConfigTypeDef sClockSourceConfig = {0}; TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_OC_InitTypeDef sConfigOC = {0}; / USER CODE BEGIN TIM2_Init 1 / / USER CODE END TIM2_Init 1 / htim2.Instance = TIM2; htim2.Init.Prescaler = 0; htim2.Init.CounterMode = TIM_COUNTERMODE_UP; htim2.Init.Period = 10000-1; htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE; if (HAL_TIM_Base_Init(&htim2) != HAL_OK) { Error_Handler(); } sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK) { Error_Handler(); } if (HAL_TIM_PWM_Init(&htim2) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigOC.OCMode = TIM_OCMODE_PWM1; sConfigOC.Pulse = 2000; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_ENABLE; if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN TIM2_Init 2 / / USER CODE END TIM2_Init 2 / HAL_TIM_MspPostInit(&htim2); } /* * @brief TIM5 Initialization Function * @param None * @retval None / static void MX_TIM5_Init(void) { / USER CODE BEGIN TIM5_Init 0 / / USER CODE END TIM5_Init 0 / TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_OC_InitTypeDef sConfigOC = {0}; / USER CODE BEGIN TIM5_Init 1 / / USER CODE END TIM5_Init 1 / htim5.Instance = TIM5; htim5.Init.Prescaler = 0; htim5.Init.CounterMode = TIM_COUNTERMODE_UP; htim5.Init.Period = 5364; htim5.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim5.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if (HAL_TIM_PWM_Init(&htim5) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim5, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigOC.OCMode = TIM_OCMODE_PWM1; sConfigOC.Pulse = 2182; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_DISABLE; if (HAL_TIM_PWM_ConfigChannel(&htim5, &sConfigOC, TIM_CHANNEL_3) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN TIM5_Init 2 / / USER CODE END TIM5_Init 2 / HAL_TIM_MspPostInit(&htim5); } /* * @brief GPIO Initialization Function * @param None * @retval None / static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; / GPIO Ports Clock Enable / __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /Configure GPIO pin : B1_Pin */ GPIO_InitStruct.Pin = B1_Pin; GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct); }

2022-12-29 16:26:03 评论举报曹玥