用HAL库改写江科大的stm32入门-6-3 PWM驱动LED呼吸灯
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接线图：
2 :实验目的：
利用pwm实现呼吸灯。
关键PWM定时器设置：
代码部分：
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_TIM2_Init();/* USER CODE BEGIN 2 */// start timer2 pwmHAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1); // start pwm on channel 1 of timer 2/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){// for breath led, change duty cycle of pwm, from 0 to 100% and back to 0for (int i = 0; i < 500; i++){__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, i); // set duty cycle of pwmHAL_Delay(10);}//delay 500msHAL_Delay(200);for (int i = 500; i > 0; i--){__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, i); // set duty cycle of pwmHAL_Delay(10);}//delay 200msHAL_Delay(200);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
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ps:pwm说明：
输出比较、CNT、CRR的概念：
pwm概念：
