两块STM32F1之间互相通信（串口）

首先准备两块STM32F103的板子，以我这个为例，我准备了一块STM32F103和CH32F103最小系统板子，其他杜邦线、下载器及接线方法以及通信原理不再多说。这里我用的是STM32F103最小系统发送数据到CH32F103最小系统上，CH32F1接收到数据点亮LED，最后用串口显示从来发送的数据。

STM32F103主机配置程序

#include "sys.h"
#include "usart2.h"
#include "delay.h"


u8 ppp;
void Usart2_Sendata()
{	
	USART_SendData(USART2,ppp);
	while( USART_GetFlagStatus(USART2,USART_FLAG_TC)!= SET);
}

int main(void)
{  	
	delay_init();
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 
	uart2_init(115200);
	while(1)
	{
		Usart2_Sendata();
	}
}

CH32F103从机配置程序

void uart2_init(u32 bound)
{
  GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);	//使能GPIOA时钟
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE); //使能USART2
	
	USART_DeInit(USART2);
	
	//USART2_TX   GPIOA.2
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
  GPIO_Init(GPIOA,&GPIO_InitStructure);//初始化GPIOA.2
   
  //USART2_RX	  GPIOA.3
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA.3
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA,&GPIO_InitStructure);//初始化GPIOA.3  

  //Usart2 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3 ;//抢占优先级3
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//子优先级3
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ通道使能
	NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器
  
   //USART 初始化设置
	USART_InitStructure.USART_BaudRate = bound;//串口波特率
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
	USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
	USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式

  USART_Init(USART2,&USART_InitStructure); //初始化串口2
  USART_ITConfig(USART2,USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_Cmd(USART2,ENABLE);                    //使能串口2
}

void USART2_IRQHandler(void)//串口2中断服务程序
{
	if(USART_GetITStatus(USART2,USART_IT_RXNE) != RESET)  
	{

			 p= USART_ReceiveData(USART2);



	}
}

int main()
{
	delay_init();	    	 
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 
	uart2_init(115200);
	uart_init(115200);
	POINT_COLOR=RED;		
	LED_Init ();
	while(1)
	{
		
		if(p==44)
		{
			LED0=0;
			delay_ms(100);
		}
		else
		{
			LED0=1;
			delay_ms(100);
		}
		printf("%d\r\n",p);

	}
}

分别把代码下载到两块板子里，打开在线debug发送数据实验主机发送数字44

从机接收数字44后用串口打印从来

 LED点亮

代码工程附 链接：https://pan.baidu.com/s/1QCPwcY_si5bNF1_3bunBZA 
提取码：rstx