用C语言写stm32 uart1接收uart2发送程序

很高兴为你解决问题。以下是用C语言写stm32 uart1接收uart2发送程序的示例代码：

#include "stm32f10x.h"
#include <stdio.h>

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

    /* Enable USART1 and GPIOA clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

    /* Configure PA9 and PA10 as USART1 Tx and Rx */
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* USART1 configuration */
    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;

    /* Enable USART1 */
    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

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

    /* Enable USART2 and GPIOA clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    /* Configure PA2 and PA3 as USART2 Tx and Rx */
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* USART2 configuration */
    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;

    /* Enable USART2 */
    USART_Init(USART2, &USART_InitStructure);
    USART_Cmd(USART2, ENABLE);
}

void USART_SendChar(USART_TypeDef* USARTx, uint8_t ch)
{
    /* Wait until transmit data register is empty */
    while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);

    /* Send a character to USART */
    USART_SendData(USARTx, (uint8_t) ch);
}

uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
{
    /* Wait until there is some data to receive */
    while (USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == RESET);

    /* Read received data from USART */
    return (uint16_t) USART_ReceiveData(USARTx);
}

int main(void)
{
    uint16_t data;

    USART1_Init();
    USART2_Init();

    while (1)
    {
        /* Receive data from USART1 */
        data = USART_ReceiveData(USART1);

        /* Send received data to USART2 */
        USART_SendChar(USART2, (uint8_t) data);

        /* Delay to avoid overloading USART */
        Delay(100);
    }
}

注意：以上示例代码仅供参考。实际情况中，您需要根据自己的需要进行修改。