STM32F767 通用定时器 单脉冲模式

疑问：定时器比较输出模式和PWM输出模式，在定时器初始化前输出IO电平为高还是低？

TIM_HandleTypeDef htim9;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM9_Init(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 */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_TIM9_Init();
  /* USER CODE BEGIN 2 */
	HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0);
	HAL_Delay(500);
	HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0);
	HAL_Delay(500);
	HAL_Delay(3000);
	
	HAL_TIM_OnePulse_Start(&htim9, TIM_CHANNEL_1);
	HAL_TIM_Base_Start(&htim9);
	
  /* 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 TIM9 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM9_Init(void)
{

  /* USER CODE BEGIN TIM9_Init 0 */

  /* USER CODE END TIM9_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};

  /* USER CODE BEGIN TIM9_Init 1 */

  /* USER CODE END TIM9_Init 1 */
  htim9.Instance = TIM9;
  htim9.Init.Prescaler = 21600;
  htim9.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim9.Init.Period = 60000;
  htim9.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim9.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim9) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim9, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_Init(&htim9) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_OnePulse_Init(&htim9, TIM_OPMODE_SINGLE) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 10000;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim9, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM9_Init 2 */

  /* USER CODE END TIM9_Init 2 */
  HAL_TIM_MspPostInit(&htim9);

}

/**
  * @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_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0/*|GPIO_PIN_1*/, GPIO_PIN_RESET);

  /*Configure GPIO pins : PB0 PB1 */
  GPIO_InitStruct.Pin = GPIO_PIN_0/*|GPIO_PIN_1*/;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

}

总结：1、将PE5与PB1短接，PE5为TIM9_CH1 IO，PB1为LED输出IO
2、
3、
4、HAL_TIM_OnePulse_Start(&htim9, TIM_CHANNEL_1);不会启动定时器计数，HAL_TIM_Base_Start(&htim9);使能定时器计数，也可以使用从模式触发（从模式触发未验证）启动定时器

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