晶片：STM32F103C8T6

應用管腳：

輸出：PA0、PA1

TIM2 CH2通道

實現PA1管腳50HZ（20ms）可調PWM輸出，系統TIMx_CNT=8MHZ=8000 000HZ，設定TIMx_PSC=800-1，那麼TIMx_ARR=(TIMx_CNT/TIMx_PSC)*定時器時間=(8000000/800)*0.02=200，TIMx_ARR=200-1。

配置介面

TIM2配置

開啟NVIC中斷配置

程式中增加PWM可調佔空比應用函式

/* USER CODE BEGIN 4 */
/**
  * @brief  調整PWM佔空比
  * @param  value為佔空比 value=50 即佔空比為50%
  * @retval None
  */
void USER_PWM_SetDutyRatio(TIM_HandleTypeDef *htim,uint32_t Channel,uint8_t value)
{
	TIM_OC_InitTypeDef sConfigOC;
	
	uint32_t period=htim->Init.Period+1;
	uint32_t pluse=(value * period)/100;
	
	sConfigOC.OCMode = TIM_OCMODE_PWM1;
	sConfigOC.Pulse = pluse;
	sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
	sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
	HAL_TIM_PWM_ConfigChannel(htim, &sConfigOC, Channel);
	HAL_TIM_PWM_Start(htim, Channel);   
}
/* USER CODE END 4 */
 

  /* USER CODE BEGIN 2 */
	HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
		USER_PWM_SetDutyRatio(&htim2,TIM_CHANNEL_2,n);
		HAL_Delay(20);
		n++;
		if(n>100)
		{
			n=0;
		}
  }
  /* USER CODE END 3 */