嵌入式蓝桥杯学习9 usart串口

复制一下之前ADC的工程，打开cubemx

cubemx配置

1.在Connectivity中点击USART1

Mode（模式）:Asynchronous（异步模式）

2.将PA9设置为USART1_TX，PA10设置为USART1_RX。

3.配置Parameter Settings.

Baud Rate（波特率）:9600

4.配置NVIC Settings

勾选 USART1 global interrupt/USART1 wake-up interrupt through EXTI line 25

点击Generated Code、

代码编写

在my_main.h中添加头文件

#include "usart.h"
#include "string.h"

my，main.c

#include "my_main.h"
#include "stm32g4xx_hal_adc.h"
#include "adc.h"
#include "usart.h"
#include "string.h"
uint8_t led_sta=0x10;
char text[30];
char usart_tx[50];
char usart_rx[50];
void LED_Disp(uint8_t dsLED)
{HAL_GPIO_WritePin(GPIOC,GPIO_PIN_All,GPIO_PIN_SET);//所有LED熄灭（l小写）HAL_GPIO_WritePin(GPIOC,dsLED<<8,GPIO_PIN_RESET);//左移8位：控制C8-15引脚，值为1的点亮HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);//开锁存器HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);//关锁存器
}
float adc_read(ADC_HandleTypeDef *hadc)
{uint16_t adc_val;float adc_f;HAL_ADC_Start(hadc);adc_val=HAL_ADC_GetValue(hadc);adc_f=adc_val*3.3f/4096.0f;return adc_f;
}
float adc_read_os(ADC_HandleTypeDef *hadc)//带 过采样
{uint16_t adc_val;float adc_f;HAL_ADC_Start(hadc);adc_val=HAL_ADC_GetValue(hadc);adc_f=adc_val*3.3f/65536.0f;return adc_f;
}
void setup()
{HAL_ADCEx_Calibration_Start(&hadc2,ADC_SINGLE_ENDED);HAL_UARTEx_ReceiveToIdle_IT(&huart1,(uint8_t*)usart_rx,50);HAL_ADCEx_Calibration_Start(&hadc2,ADC_SINGLE_ENDED);LED_Disp(0x00);//关掉所有LED	LCD_Init();//LCD初始化LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);
}void loop()
{float adc_data_PB15;adc_data_PB15=adc_read(&hadc2);sprintf(usart_tx,"    PB15=%.4fV   \r\n ",adc_data_PB15);HAL_UART_Transmit(&huart1,(uint8_t *)usart_tx,strlen(usart_tx),50);
}

示例：密码锁

#include "my_main.h"
#include "stm32g4xx_hal_adc.h"
#include "adc.h"
#include "usart.h"
#include "string.h"
uint8_t led_sta=0x10;
char text[30];
extern struct Bkeys bkey[];
char usart_tx[50];
char usart_rx[50];
char passwd[3]={'1','2','3'};
void LED_Disp(uint8_t dsLED)
{HAL_GPIO_WritePin(GPIOC,GPIO_PIN_All,GPIO_PIN_SET);//所有LED熄灭（l小写）HAL_GPIO_WritePin(GPIOC,dsLED<<8,GPIO_PIN_RESET);//左移8位：控制C8-15引脚，值为1的点亮HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);//开锁存器HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);//关锁存器
}
void setup()
{HAL_ADCEx_Calibration_Start(&hadc2,ADC_SINGLE_ENDED);HAL_UARTEx_ReceiveToIdle_IT(&huart1,(uint8_t*)usart_rx,50);HAL_ADCEx_Calibration_Start(&hadc2,ADC_SINGLE_ENDED);LED_Disp(0x00);//关掉所有LEDLCD_Init();//LCD初始化LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);
}void loop()
{}void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{	char old_pswd[10];char new_pswd[10];sscanf(usart_rx,"%3s-%3s",old_pswd,new_pswd);if(strcmp(old_pswd,passwd)==0){	for(int i=0;i<3;i++)passwd[i]=new_pswd[i];sprintf(text,"new:%s ",passwd);LCD_DisplayStringLine(Line4,(uint8_t *)text);//局部刷新	}else{	sprintf(text,"Failed! ");LCD_DisplayStringLine(Line4,(uint8_t *)text);//局部刷新	}HAL_UARTEx_ReceiveToIdle_IT(&huart1,(uint8_t*)usart_rx,50);     
}