蓝桥杯STM32 G431 hal库开发速成—

蓝桥杯STM32 G431 hal库开发速成——输入捕获

蓝桥杯的输入捕获较为简单，基本不涉及溢出的问题。所以这里就不介绍溢出了。文末有源码。

一、Cubemx配置

在这里插入图片描述

二、代码编写

1.在捕获回调函数中


void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance==TIM3){switch(count){case 1:{jishu1=__HAL_TIM_GET_COUNTER(&htim3);__HAL_TIM_SET_CAPTUREPOLARITY(&htim3, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_FALLING);count++;break;}case 2:{jishu2=__HAL_TIM_GET_COUNTER(&htim3);__HAL_TIM_SET_CAPTUREPOLARITY(&htim3, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_RISING);count++;break;}case 3:{jishu3=__HAL_TIM_GET_COUNTER(&htim3);count++;HAL_TIM_IC_Stop_IT(&htim3,TIM_CHANNEL_1);break;}}}
}

2.在main函数中

 LCD_Init();LCD_Clear(White);HAL_TIM_IC_Stop_IT(&htim3, TIM_CHANNEL_1);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */switch(count){case 0:{__HAL_TIM_SET_COUNTER(&htim3, 0);HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1);__HAL_TIM_SET_CAPTUREPOLARITY(&htim3, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_RISING);count++;break;}case 4:{fre=1000000.0/(jishu3-jishu1);zkb=(jishu2-jishu1)*100.0/(jishu3-jishu1);
//			  频率为占空比为sprintf(buff,"zkb:%.2f%% fre:%.2f",zkb,fre);LCD_DisplayStringLine(Line4, buff);count=0;break;}}}/* USER CODE END 3 */
}