Hi everyone, I'm working on a STM32F429I-Discovery board and trying to output a 24 MHz PWM signal on PA8 (TIM1_CH1) to drive an MT9M001 camera module as the XCLK signal. In my own CubeMX-generated project, PA8 stays LOW — no waveform appears.However, if I take the official exampleProjects/STM324x9I_EVAL/Examples/DCMI/DCMI_CaptureMode,and add the same PWM settings, the signal comes out fine. Here’s what I confirmed: TIM1 initialized successfully with HAL_TIM_PWM_Init() and HAL_TIM_PWM_ConfigChannel(). GPIO A8 = AF1_TIM1, Push-Pull, No Pull, Very High Speed. HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1); is executed. PWM period = 7 (≈ 22.5 MHz), pulse = 4 (≈ 50 % duty). System clock = 180 MHz (PLL on HSE 8 MHz). No error occurs, but no output. Thanks for any advice! Edited by ST moderator: removed system_stm32f4xx.c content not needed for the conversation.

Graduate

Solved

PA8 (TIM1_CH1) PWM not outputting in my CubeMX project (works in DCMI example)

Forum|Forum|3 months ago
November 10, 2025
2 replies
216 views

Hi everyone,

I'm working on a STM32F429I-Discovery board and trying to output a 24 MHz PWM signal on PA8 (TIM1_CH1) to drive an MT9M001 camera module as the XCLK signal.

In my own CubeMX-generated project, PA8 stays LOW — no waveform appears.
However, if I take the official example
Projects/STM324x9I_EVAL/Examples/DCMI/DCMI_CaptureMode,
and add the same PWM settings, the signal comes out fine.

Here’s what I confirmed:

TIM1 initialized successfully with HAL_TIM_PWM_Init() and HAL_TIM_PWM_ConfigChannel().
GPIO A8 = AF1_TIM1, Push-Pull, No Pull, Very High Speed.
HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1); is executed.
PWM period = 7 (≈ 22.5 MHz), pulse = 4 (≈ 50 % duty).
System clock = 180 MHz (PLL on HSE 8 MHz).

No error occurs, but no output.

Thanks for any advice!

Edited by ST moderator: removed system_stm32f4xx.c content not needed for the conversation.

This topic has been closed for replies.

Best answer by TDK

> sConfigOC.Pulse = 0;

You have configured a 0 % duty cycle wave--a DC signal. Change this to 4 if you want 50% duty cycle.

mƎALLEm

Technical Moderator

Hello,

Better to post your project at least your ioc file.

I don't see why are you posting system_stm32f4xx.c content?

chachamaruAuthor

Graduate

Oh, sorry — I missed that.
Here is my code.

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file : main.c
 * @brief : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2025 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usb_host.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
CRC_HandleTypeDef hcrc;

DMA2D_HandleTypeDef hdma2d;

LTDC_HandleTypeDef hltdc;

SPI_HandleTypeDef hspi5;

TIM_HandleTypeDef htim1;

UART_HandleTypeDef huart1;

SDRAM_HandleTypeDef hsdram1;

/* USER CODE BEGIN PV */
const char msg[] = "Hello World\r\n";
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_CRC_Init(void);
static void MX_DMA2D_Init(void);
static void MX_FMC_Init(void);
static void MX_LTDC_Init(void);
static void MX_SPI5_Init(void);
static void MX_TIM1_Init(void);
static void MX_USART1_UART_Init(void);
void MX_USB_HOST_Process(void);

/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
 * @brief The application entry point.
 * @retval int
 */
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 */
 MX_USART1_UART_Init(); //UART初期化
 MX_TIM1_Init(); //PA8設定
 /* USER CODE END SysInit */

 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 MX_CRC_Init();
 MX_DMA2D_Init();
 MX_FMC_Init();
 MX_LTDC_Init();
 MX_SPI5_Init();
 MX_TIM1_Init();
 MX_USART1_UART_Init();
 MX_USB_HOST_Init();
 /* USER CODE BEGIN 2 */
 Start_XCLK(); //PWM開始
 /* USER CODE END 2 */

 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
	 HAL_UART_Transmit(&huart1, (uint8_t*)msg, sizeof(msg)-1, HAL_MAX_DELAY);
	 HAL_Delay(100);
 /* USER CODE END WHILE */
 MX_USB_HOST_Process();

 /* 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_SCALE1);

 /** Initializes the RCC Oscillators according to the specified parameters
 * in the RCC_OscInitTypeDef structure.
 */
 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
 RCC_OscInitStruct.HSEState = RCC_HSE_ON;
 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
 RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
 RCC_OscInitStruct.PLL.PLLM = 8;
 RCC_OscInitStruct.PLL.PLLN = 360;
 RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
 RCC_OscInitStruct.PLL.PLLQ = 7;
 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
 {
 Error_Handler();
 }

 /** Activate the Over-Drive mode
 */
 if (HAL_PWREx_EnableOverDrive() != 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_DIV4;
 RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV4;

 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
 {
 Error_Handler();
 }
}

/**
 * @brief CRC Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_CRC_Init(void)
{

 /* USER CODE BEGIN CRC_Init 0 */

 /* USER CODE END CRC_Init 0 */

 /* USER CODE BEGIN CRC_Init 1 */

 /* USER CODE END CRC_Init 1 */
 hcrc.Instance = CRC;
 if (HAL_CRC_Init(&hcrc) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN CRC_Init 2 */

 /* USER CODE END CRC_Init 2 */

}

/**
 * @brief DMA2D Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_DMA2D_Init(void)
{

 /* USER CODE BEGIN DMA2D_Init 0 */

 /* USER CODE END DMA2D_Init 0 */

 /* USER CODE BEGIN DMA2D_Init 1 */

 /* USER CODE END DMA2D_Init 1 */
 hdma2d.Instance = DMA2D;
 hdma2d.Init.Mode = DMA2D_M2M;
 hdma2d.Init.ColorMode = DMA2D_OUTPUT_ARGB8888;
 hdma2d.Init.OutputOffset = 0;
 hdma2d.LayerCfg[1].InputOffset = 0;
 hdma2d.LayerCfg[1].InputColorMode = DMA2D_INPUT_ARGB8888;
 hdma2d.LayerCfg[1].AlphaMode = DMA2D_NO_MODIF_ALPHA;
 hdma2d.LayerCfg[1].InputAlpha = 0;
 if (HAL_DMA2D_Init(&hdma2d) != HAL_OK)
 {
 Error_Handler();
 }
 if (HAL_DMA2D_ConfigLayer(&hdma2d, 1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN DMA2D_Init 2 */

 /* USER CODE END DMA2D_Init 2 */

}

/**
 * @brief LTDC Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_LTDC_Init(void)
{

 /* USER CODE BEGIN LTDC_Init 0 */

 /* USER CODE END LTDC_Init 0 */

 LTDC_LayerCfgTypeDef pLayerCfg = {0};

 /* USER CODE BEGIN LTDC_Init 1 */

 /* USER CODE END LTDC_Init 1 */
 hltdc.Instance = LTDC;
 hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AL;
 hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
 hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
 hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
 hltdc.Init.HorizontalSync = 9;
 hltdc.Init.VerticalSync = 1;
 hltdc.Init.AccumulatedHBP = 29;
 hltdc.Init.AccumulatedVBP = 3;
 hltdc.Init.AccumulatedActiveW = 269;
 hltdc.Init.AccumulatedActiveH = 323;
 hltdc.Init.TotalWidth = 279;
 hltdc.Init.TotalHeigh = 327;
 hltdc.Init.Backcolor.Blue = 0;
 hltdc.Init.Backcolor.Green = 0;
 hltdc.Init.Backcolor.Red = 0;
 if (HAL_LTDC_Init(&hltdc) != HAL_OK)
 {
 Error_Handler();
 }
 pLayerCfg.WindowX0 = 0;
 pLayerCfg.WindowX1 = 240;
 pLayerCfg.WindowY0 = 0;
 pLayerCfg.WindowY1 = 320;
 pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
 pLayerCfg.Alpha = 255;
 pLayerCfg.Alpha0 = 0;
 pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
 pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
 pLayerCfg.FBStartAdress = 0xD0000000;
 pLayerCfg.ImageWidth = 240;
 pLayerCfg.ImageHeight = 320;
 pLayerCfg.Backcolor.Blue = 0;
 pLayerCfg.Backcolor.Green = 0;
 pLayerCfg.Backcolor.Red = 0;
 if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN LTDC_Init 2 */

 /* USER CODE END LTDC_Init 2 */

}

/**
 * @brief SPI5 Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_SPI5_Init(void)
{

 /* USER CODE BEGIN SPI5_Init 0 */

 /* USER CODE END SPI5_Init 0 */

 /* USER CODE BEGIN SPI5_Init 1 */

 /* USER CODE END SPI5_Init 1 */
 /* SPI5 parameter configuration*/
 hspi5.Instance = SPI5;
 hspi5.Init.Mode = SPI_MODE_MASTER;
 hspi5.Init.Direction = SPI_DIRECTION_2LINES;
 hspi5.Init.DataSize = SPI_DATASIZE_8BIT;
 hspi5.Init.CLKPolarity = SPI_POLARITY_LOW;
 hspi5.Init.CLKPhase = SPI_PHASE_1EDGE;
 hspi5.Init.NSS = SPI_NSS_SOFT;
 hspi5.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
 hspi5.Init.FirstBit = SPI_FIRSTBIT_MSB;
 hspi5.Init.TIMode = SPI_TIMODE_DISABLE;
 hspi5.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
 hspi5.Init.CRCPolynomial = 10;
 if (HAL_SPI_Init(&hspi5) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN SPI5_Init 2 */

 /* USER CODE END SPI5_Init 2 */

}

/**
 * @brief TIM1 Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_TIM1_Init(void)
{

 /* USER CODE BEGIN TIM1_Init 0 */

 /* USER CODE END TIM1_Init 0 */

 TIM_ClockConfigTypeDef sClockSourceConfig = {0};
 TIM_MasterConfigTypeDef sMasterConfig = {0};
 TIM_OC_InitTypeDef sConfigOC = {0};
 TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};

 /* USER CODE BEGIN TIM1_Init 1 */

 /* USER CODE END TIM1_Init 1 */
 htim1.Instance = TIM1;
 htim1.Init.Prescaler = 0;
 htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim1.Init.Period = 7;
 htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim1.Init.RepetitionCounter = 0;
 htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
 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_PWM_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();
 }
 sConfigOC.OCMode = TIM_OCMODE_PWM1;
 sConfigOC.Pulse = 0;
 sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
 sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
 sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
 sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
 sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
 if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
 {
 Error_Handler();
 }
 sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
 sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
 sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
 sBreakDeadTimeConfig.DeadTime = 0;
 sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
 sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
 sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
 if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN TIM1_Init 2 */
 __HAL_TIM_MOE_ENABLE(&htim1); // ★ Advanced-timerの出力許可
 /* USER CODE END TIM1_Init 2 */
 HAL_TIM_MspPostInit(&htim1);

}

/**
 * @brief USART1 Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_USART1_UART_Init(void)
{

 /* USER CODE BEGIN USART1_Init 0 */

 /* USER CODE END USART1_Init 0 */

 /* USER CODE BEGIN USART1_Init 1 */

 /* USER CODE END USART1_Init 1 */
 huart1.Instance = USART1;
 huart1.Init.BaudRate = 115200;
 huart1.Init.WordLength = UART_WORDLENGTH_8B;
 huart1.Init.StopBits = UART_STOPBITS_1;
 huart1.Init.Parity = UART_PARITY_NONE;
 huart1.Init.Mode = UART_MODE_TX_RX;
 huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
 huart1.Init.OverSampling = UART_OVERSAMPLING_16;
 if (HAL_UART_Init(&huart1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN USART1_Init 2 */

 /* USER CODE END USART1_Init 2 */

}

/* FMC initialization function */
static void MX_FMC_Init(void)
{

 /* USER CODE BEGIN FMC_Init 0 */

 /* USER CODE END FMC_Init 0 */

 FMC_SDRAM_TimingTypeDef SdramTiming = {0};

 /* USER CODE BEGIN FMC_Init 1 */

 /* USER CODE END FMC_Init 1 */

 /** Perform the SDRAM1 memory initialization sequence
 */
 hsdram1.Instance = FMC_SDRAM_DEVICE;
 /* hsdram1.Init */
 hsdram1.Init.SDBank = FMC_SDRAM_BANK2;
 hsdram1.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
 hsdram1.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
 hsdram1.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;
 hsdram1.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
 hsdram1.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
 hsdram1.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
 hsdram1.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
 hsdram1.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
 hsdram1.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;
 /* SdramTiming */
 SdramTiming.LoadToActiveDelay = 2;
 SdramTiming.ExitSelfRefreshDelay = 7;
 SdramTiming.SelfRefreshTime = 4;
 SdramTiming.RowCycleDelay = 7;
 SdramTiming.WriteRecoveryTime = 3;
 SdramTiming.RPDelay = 2;
 SdramTiming.RCDDelay = 2;

 if (HAL_SDRAM_Init(&hsdram1, &SdramTiming) != HAL_OK)
 {
 Error_Handler( );
 }

 /* USER CODE BEGIN FMC_Init 2 */

 /* USER CODE END FMC_Init 2 */
}

/**
 * @brief GPIO Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 /* USER CODE BEGIN MX_GPIO_Init_1 */

 /* USER CODE END MX_GPIO_Init_1 */

 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOF_CLK_ENABLE();
 __HAL_RCC_GPIOH_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 __HAL_RCC_GPIOG_CLK_ENABLE();
 __HAL_RCC_GPIOE_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOC, NCS_MEMS_SPI_Pin|CSX_Pin|OTG_FS_PSO_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(ACP_RST_GPIO_Port, ACP_RST_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOD, RDX_Pin|WRX_DCX_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOG, LD3_Pin|LD4_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pins : NCS_MEMS_SPI_Pin CSX_Pin OTG_FS_PSO_Pin */
 GPIO_InitStruct.Pin = NCS_MEMS_SPI_Pin|CSX_Pin|OTG_FS_PSO_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

 /*Configure GPIO pins : B1_Pin MEMS_INT1_Pin MEMS_INT2_Pin TP_INT1_Pin */
 GPIO_InitStruct.Pin = B1_Pin|MEMS_INT1_Pin|MEMS_INT2_Pin|TP_INT1_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_EVT_RISING;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

 /*Configure GPIO pin : ACP_RST_Pin */
 GPIO_InitStruct.Pin = ACP_RST_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(ACP_RST_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pin : OTG_FS_OC_Pin */
 GPIO_InitStruct.Pin = OTG_FS_OC_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_EVT_RISING;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(OTG_FS_OC_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pin : BOOT1_Pin */
 GPIO_InitStruct.Pin = BOOT1_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(BOOT1_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pin : TE_Pin */
 GPIO_InitStruct.Pin = TE_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(TE_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pins : RDX_Pin WRX_DCX_Pin */
 GPIO_InitStruct.Pin = RDX_Pin|WRX_DCX_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

 /*Configure GPIO pin : I2C3_SDA_Pin */
 GPIO_InitStruct.Pin = I2C3_SDA_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 GPIO_InitStruct.Alternate = GPIO_AF4_I2C3;
 HAL_GPIO_Init(I2C3_SDA_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pins : LD3_Pin LD4_Pin */
 GPIO_InitStruct.Pin = LD3_Pin|LD4_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

 /* USER CODE BEGIN MX_GPIO_Init_2 */
 // GPIO設定：PA8をTIM1_CH1として出力
 	__HAL_RCC_GPIOA_CLK_ENABLE();
 	GPIO_InitStruct.Pin = GPIO_PIN_8;
 	GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 	GPIO_InitStruct.Pull = GPIO_NOPULL;
 	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 	GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
 	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 /* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */
void Start_XCLK(void)
{
	HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1); //PWM出力開始
}
/* USER CODE END 4 */

/**
 * @brief Period elapsed callback in non blocking mode
 * @note This function is called when TIM6 interrupt took place, inside
 * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
 * a global variable "uwTick" used as application time base.
 * @PAram htim : TIM handle
 * @retval None
 */
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 */

 /* USER CODE END Callback 1 */
}

/**
 * @brief This function is executed in case of error occurrence.
 * @retval None
 */
void Error_Handler(void)
{
 /* USER CODE BEGIN Error_Handler_Debug */
 /* User can add his own implementation to report the HAL error return state */
 __disable_irq();
 while (1)
 {
 }
 /* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
 * @brief Reports the name of the source file and the source line number
 * where the assert_param error has occurred.
 * @PAram file: pointer to the source file name
 * @PAram line: assert_param error line source number
 * @retval None
 */
void assert_failed(uint8_t *file, uint32_t line)
{
 /* USER CODE BEGIN 6 */
 /* User can add his own implementation to report the file name and line number,
 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

This is the TIM1 Mode and Configuration screen.
I can’t change “Maximum Output Speed”.

I tried:

Changing the pin to GPIO Output mode and setting it to Very High speed
Switching it back to TIM1 configuration

…but it always resets to the previous state.
Also, this parameter is not editable on the TIM1 configuration screen itself.

TDKAnswer

Super User

> sConfigOC.Pulse = 0;

You have configured a 0 % duty cycle wave--a DC signal. Change this to 4 if you want 50% duty cycle.

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