【STM32HAL库】定时器输出比较PWM-呼吸灯实验

void TIM_GENERAL_INIT(uint16_t psc,uint16_t arr)
{
	
	TIM_OC_InitTypeDef sConfig;
	
	htim3.Instance = TIM3;
	htim6.Init.Prescaler = psc;
	htim3.Init.Period = arr;
	htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
	HAL_TIM_PWM_Init(&htim3);
	
	sConfig.OCMode = TIM_OCMODE_PWM1;//PWM模式
	sConfig.Pulse = 0;//CRR
	sConfig.OCPolarity = TIM_OCPOLARITY_LOW;//输出极性
	/*
	sConfig.OCNPolarity = 
	sConfig.OCFastMode = 
	sConfig.OCIdleState = 
	sConfig.OCNIdleState = 
	这些不需要
	*/
	HAL_TIM_PWM_ConfigChannel(&htim3,&sConfig,TIM_CHANNEL_2); 
	HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);
}

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
	if(htim->Instance == TIM3)
	{
		__HAL_RCC_TIM3_CLK_ENABLE();
		__HAL_RCC_AFIO_CLK_ENABLE();
		__HAL_RCC_GPIOB_CLK_ENABLE();
		__HAL_AFIO_REMAP_TIM3_PARTIAL();
		GPIO_InitTypeDef GPIO_Init;
		
		GPIO_Init.Pin = GPIO_PIN_5;
		GPIO_Init.Mode=GPIO_MODE_AF_PP;
		//GPIO_Init.Pull = GPIO_PULLDOWN;
		GPIO_Init.Speed=GPIO_SPEED_FREQ_HIGH;
		HAL_GPIO_Init(GPIOB,&GPIO_Init);
	}
}

uint32_t time;
int main(void)
{
    HAL_Init();                              /* 初始化HAL库 */
    sys_stm32_clock_init(RCC_PLL_MUL9);      /* 设置时钟, 72Mhz */
    delay_init(72);                          /* 延时初始化 */
    LED_Init();                              /* LED初始化 */
    KEY_Init();
	EXTI_Init();
	USART_Init(115200);
	//TIM_BASIC_INIT(7200-1,5000-1);
	TIM_GENERAL_INIT(72-1,500-1);
    while(1)
    { 
	  for(time=0;time<500;time++)
		{
			__HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_2,time);//CRR的值
			delay_ms(1);
		}
	  for(time=500;time>0;time--)
		{
			__HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_2,time);
				delay_ms(1);
		}
		
	}
}