基于中断/DMA的串口通信

一.中断方式

1.程序设计流程

（1）处代码

if(huart->Instance == USART1&&strcmp((char *)RxBuffer,"stop")==0){
		RxFlag = 1;
		HAL_UART_Receive_IT(huart, (uint8_t*)&RxBuffer, LENGTH);
	}

（2）处代码

else if(huart->Instance == USART1&&strcmp((char *)RxBuffer,"star")==0&&flag==1){
		flag = 0;
		HAL_UART_Receive_IT(huart, (uint8_t*)&ch, 1);
	}

（3）处代码

if(huart->Instance == USART1 && ch == 't' && flag == 0){
		RxFlag = 0;
		flag = 1;
		ch = '0';
		HAL_UART_Receive_IT(huart, (uint8_t*)&RxBuffer, LENGTH);
	}

2. 工程创建

同前面工程创建相同参考：
https://blog.youkuaiyun.com/zhuzhUzzzZAGHndu/article/details/134082075?spm=1001.2014.3001.5502
 

3.代码修改：
3.1 添加头文件

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

3.2 添加变量

uint8_t RxBuffer[LENGTH]; //字符缓冲区，LENGTH定义为4
uint8_t RxFlag = 0;//是否接受到stop
uint8_t ch;//额外字符't'的缓冲区
uint8_t flag = 1;//是否需要继续接收额外字符

3.3 修改while循环

while (1)
  {
    /* USER CODE END WHILE */
	  if(RxFlag == 0){
		  HAL_UART_Transmit(&huart1,(uint8_t*)"hello windows!\r\n",16,0xffff);
		  HAL_Delay(1000);
	  }
    /* USER CODE BEGIN 3 */
  }

3.4添加中断循环

void HAL_UART_RxCpltCallba