设置TIM1输出对称PWM,程序运行时怎样更改频率？

修改PWM频率：

• __HAL_TIM_SET_AUTORELOAD(__HANDLE__, __AUTORELOAD__)
  
  
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sh memory and the processor registers */ void HAL_MspInit(void){   /* USER CODE BEGIN MspInit 0 */   /* USER CODE END MspInit 0 */   __HAL_RCC_SYSCFG_CLK_ENABLE();   / * Configure the system clock */   /* USER CODE BEGIN MspInit 1 */   /* USER CODE END MspInit 1 */}
 / * * @brief TIM_Base MSP Initialization * @param htim_base: TIM_Base handle pointer * @retval None */ void HAL_TIM_Base_MspInit(TIM_HandleTypeDef tid) { nue ... }

*/

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
  if (htim->Instance == TIM1)
  {
         __HAL_RCC_TIM1_CLK_ENABLE();
  }
}

 / * * @brief TIM PWM_MspInit * @param htim_pwm: TIM PWM handle pointer * @retval None */ void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef tid) { nude ... }

*/

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if (htim->Instance == TIM1)
  {
         __HAL_RCC_GPIOA_CLK_ENABLE();

    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    USART1_Clk_Init();
  }
}

 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_TIM1_Init();
  MX_USART1_UART_Init();

  /* USER CODE BEGIN 2 */
   // Set the PWM frequency
   __HAL_TIM_SetPrescaler(&htim1, 271); // 271 corresponds to a frequency of 1 kHz
 
   // Set the PWM duty cycle
   __HAL_TIM_SetCompare(&htim1, TIM_CHANNEL_1, 200); // 200 corresponds to a duty cycle of 78%
 
   // Start the PWM generation
   HAL_TIM_PWM_Start(&htim1, 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 */
}