代码收藏家技术教程 2024-07-25

STM32 HAL库定时器捕获占空比和周期设置

一、HAL库配置

这里打开tim3通道二用来捕捉下降沿/上升沿，tim3的时钟用来计时

这里配置成上升沿触发

这里打开定时器2的2通道，输出1KHz的方波让我们捕获

二、实验效果

pwm输出效果：

三、代码展示

1、获取占空比

tim.c

int tim3_duty,tim3_cycle;
uint8_t tim3_flag,tim3_call_count;
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
	if(htim==&htim3)
	{
		tim3_call_count++;
		__HAL_TIM_SET_COUNTER(&htim3,0);
	}
}

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
	if(htim==&htim3)
	{
		switch (tim3_flag)
        {
        	case 0:		//上升沿进入
				tim3_call_count=tim3_duty=0;
				__HAL_TIM_SET_COUNTER(&htim3,0);
				HAL_TIM_Base_Start_IT(&htim3);
				TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性__HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_FALLING);//改为下降沿触发极性
				tim3_flag =1;
        		break;
        	case 1:
				tim3_duty=HAL_TIM_ReadCapturedValue(&htim3,TIM_CHANNEL_2);
					tim3_duty+=tim3_call_count*1000;
					printf("duty:%d \r\n",tim3_duty+1);
					TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性
					                __HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_RISING);//改为上升沿触发极性
					tim3_flag =0;
        		break;

        }

	}
}

main.c

	__HAL_TIM_CLEAR_FLAG(&htim3,TIM_FLAG_UPDATE);
	HAL_TIM_Base_Start_IT(&htim3);
	HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_2);


	HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_2);
	__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_2,500);

2、获取周期

直接复制粘贴上面的占空比测量

void get_cycle ()
{
	switch (tim3_flag)
	{
		case 0:		//上升沿进入
			__HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_2,0);
			tim3_call_count=tim3_duty=0;
			__HAL_TIM_SET_COUNTER(&htim3,0);//定时器计数清零
			HAL_TIM_Base_Start_IT(&htim3);//开始计时
			TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性
			__HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_RISING);
			tim3_flag =1;
			break;
		case 1:
				tim3_duty=__HAL_TIM_GET_COMPARE(&htim3,TIM_CHANNEL_2);
				tim3_duty+=tim3_call_count*1000;
				printf("cycle:%d \r\n",tim3_duty);
				TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性
				__HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_RISING);
				tim3_flag =0;
			break;
	}

}

输出的pwm：

	HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_2);
	__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_2,100);
	__HAL_TIM_SET_AUTORELOAD(&htim2,2000);

结果：

tim.c一起获取周期和占空比代码

void get_duty ()
{

		switch (tim3_flag)
        {
        	case 0:		//上升沿进入
				tim3_call_count=tim3_duty=0;
				__HAL_TIM_SET_COUNTER(&htim3,0);
				HAL_TIM_Base_Start_IT(&htim3);
				TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性
				__HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_FALLING);//改为下降沿触发极性
				tim3_flag =1;
        		break;
        	case 1:
				tim3_duty=HAL_TIM_ReadCapturedValue(&htim3,TIM_CHANNEL_2);
				tim3_duty+=tim3_call_count*1000;
				printf("duty:%d \r\n",tim3_duty);
				TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性
				 __HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_RISING);//改为触发极性
				tim3_flag =2;
        		break;
			case 2:
				tim3_cycle=HAL_TIM_ReadCapturedValue(&htim3,TIM_CHANNEL_2);
				tim3_cycle+=tim3_call_count*1000;
				printf("cle:%d \r\n",tim3_cycle);
				TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2);//复位触发极性
				 __HAL_TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_2,TIM_INPUTCHANNELPOLARITY_RISING);//改为触发极性
				tim3_flag =0;
        		break;
        }
}