两块STM32串口通信传输字符

以下是两块STM32串口通信传输字符的示例代码：

主控板代码：

#include "stm32f10x.h"
#include "stdio.h"

#define USART1_DR_Base  0x40013804
#define USART2_DR_Base  0x40004404

void USART1_Init(void);
void USART1_SendData(char data);
void USART1_SendString(char* str);

void USART2_Init(void);
void USART2_SendData(char data);
void USART2_SendString(char* str);

int main()
{
    // 初始化USART1和USART2
    USART1_Init();
    USART2_Init();

    while (1)
    {
        char data;
        // 从USART1读取数据并发送到USART2
        if (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET)
        {
            data = USART_ReceiveData(USART1);
            USART2_SendData(data);
        }

        // 从USART2读取数据并发送到USART1
        if (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET)
        {
            data = USART_ReceiveData(USART2);
            USART1_SendData(data);
        }
    }
}

void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    // 使能GPIOA和USART1的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

    // 配置USART1的Tx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART1的Rx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART1的波特率、字长等
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    // 使能USART1
    USART_Cmd(USART1, ENABLE);
}

void USART1_SendData(char data)
{
    // 等待发送缓冲区为空
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

    // 发送数据
    USART_SendData(USART1, data);
}

void USART1_SendString(char* str)
{
    // 循环发送字符串
    while (*str)
    {
        USART1_SendData(*str++);
    }
}

void USART2_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    // 使能GPIOA和USART2的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB1Periph_USART2, ENABLE);

    // 配置USART2的Tx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART2的Rx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART2的波特率、字长等
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART2, &USART_InitStructure);

    // 使能USART2
    USART_Cmd(USART2, ENABLE);
}

void USART2_SendData(char data)
{
    // 等待发送缓冲区为空
    while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

    // 发送数据
    USART_SendData(USART2, data);
}

void USART2_SendString(char* str)
{
    // 循环发送字符串
    while (*str)
    {
        USART2_SendData(*str++);
    }
}

从板代码：

#include "stm32f10x.h"
#include "stdio.h"

#define USART1_DR_Base  0x40013804
#define USART2_DR_Base  0x40004404

void USART1_Init(void);
void USART1_SendData(char data);
void USART1_SendString(char* str);

void USART2_Init(void);
void USART2_SendData(char data);
void USART2_SendString(char* str);

int main()
{
    // 初始化USART1和USART2
    USART1_Init();
    USART2_Init();

    while (1)
    {
        char data;
        // 从USART2读取数据并发送到USART1
        if (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET)
        {
            data = USART_ReceiveData(USART2);
            USART1_SendData(data);
        }

        // 从USART1读取数据并发送到USART2
        if (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET)
        {
            data = USART_ReceiveData(USART1);
            USART2_SendData(data);
        }
    }
}

void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    // 使能GPIOA和USART1的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

    // 配置USART1的Tx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART1的Rx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART1的波特率、字长等
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    // 使能USART1
    USART_Cmd(USART1, ENABLE);
}

void USART1_SendData(char data)
{
    // 等待发送缓冲区为空
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

    // 发送数据
    USART_SendData(USART1, data);
}

void USART1_SendString(char* str)
{
    // 循环发送字符串
    while (*str)
    {
        USART1_SendData(*str++);
    }
}

void USART2_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    // 使能GPIOA和USART2的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB1Periph_USART2, ENABLE);

    // 配置USART2的Tx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART2的Rx引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置USART2的波特率、字长等
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART2, &USART_InitStructure);

    // 使能USART2
    USART_Cmd(USART2, ENABLE);
}

void USART2_SendData(char data)
{
    // 等待发送缓冲区为空
    while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

    // 发送数据
    USART_SendData(USART2, data);
}

void USART2_SendString(char* str)
{
    // 循环发送字符串
    while (*str)
    {
        USART2_SendData(*str++);
    }
}