【iCore4 雙核心板_ARM】例程八：定時器PWM實驗——呼吸燈

實驗原理：
　　STM32的定時器有PWM功能，iCore4的藍色LED連線在定時器的輸出介面上，

可以通過定時器的PWM輸出控制LED的亮度，從而實驗呼吸燈的功能。

核心程式碼：

int main(void)
{

  /* USER CODE BEGIN 1 */
    int brightness = 0;
    float temp = 0.0;
    int data = 0;
  /* 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();

  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

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

  /* USER CODE BEGIN 3 */
        HAL_Delay(30);
        if(brightness == 100){
            brightness = 0;
        }
        temp =  199 * (sin(2 * PI / 99.0 * brightness) * 0.5 + 0.5);
        data = (int)temp;
        set_compare(data);
        
        brightness ++;
  }
  /* USER CODE END 3 */

}

原始碼下載連結：

連結：http://pan.baidu.com/s/1hsQnbEW 密碼：z12v

iCore4連結：