蓝桥杯4T平台（串口打印电压值）

知识点：串口(单片机发送数据)+按键+ADC

题目

配置 

代码

adc.c

uint16_t getadc2(void)
{uint16_t adc=0;HAL_ADC_Start(&hadc2);adc=HAL_ADC_GetValue(&hadc2);return adc;
}

 adc.h

uint16_t getadc2(void);

main.c

#include "lcd.h"
#include "stdio.h"
#include "string.h"

  /* USER CODE BEGIN 2 */LCD_Init();LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);HAL_UART_Receive_IT(&huart1,&rx_data,1);HAL_ADCEx_Calibration_Start(&hadc2,ADC_SINGLE_ENDED);/* USER CODE END 2 */

 while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */key_proc();}

uint8_t key_scan(void)
{
uint8_t key_val=0;
if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0)==GPIO_PIN_RESET)
{
key_val=4;
}
return key_val;
}
void key_proc(void)
{
key_val=key_scan();
key_down=key_val&(key_val^key_old);
key_up=~key_val&(key_val^key_old);
key_old=key_val;if(key_down==4)
{   VR37=getadc2()*3.3/4096;sprintf(tx_buf,"VR37:%.2fV\r\n",VR37);HAL_UART_Transmit(&huart1,(uint8_t*)tx_buf,strlen(tx_buf),50);
}}