stm32f407zet6固件库写usart6的收发程序

好的，下面是一个使用STM32F407ZET6固件库编写USART6收发程序的示例代码：

#include "stm32f4xx.h"
#include <stdio.h>

#define BUFFER_SIZE 128

char rx_buffer[BUFFER_SIZE];
volatile uint8_t rx_index = 0;

void USART6_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    // Enable clock for GPIOC and USART6
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6, ENABLE);

    // Configure PC6 as USART6 Tx and PC7 as USART6 Rx
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOC, &GPIO_InitStruct);

    // Connect PC6 to USART6 Tx and PC7 to USART6 Rx
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART6);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_USART6);

    // Configure USART6
    USART_InitStruct.USART_BaudRate = 115200;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART6, &USART_InitStruct);

    // Enable USART6 interrupt
    NVIC_InitStruct.NVIC_IRQChannel = USART6_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    // Enable USART6
    USART_Cmd(USART6, ENABLE);

    // Enable USART6 RX interrupt
    USART_ITConfig(USART6, USART_IT_RXNE, ENABLE);
}

void USART6_SendChar(char ch)
{
    // Wait for TX buffer to be empty
    while (USART_GetFlagStatus(USART6, USART_FLAG_TXE) == RESET);

    // Send character
    USART_SendData(USART6, ch);

    // Wait for transmission to complete
    while (USART_GetFlagStatus(USART6, USART_FLAG_TC) == RESET);
}

void USART6_SendString(char *str)
{
    while (*str)
    {
        USART6_SendChar(*str++);
    }
}

void USART6_IRQHandler(void)
{
    if (USART_GetITStatus(USART6, USART_IT_RXNE) != RESET)
    {
        char data = USART_ReceiveData(USART6);

        if (rx_index < BUFFER_SIZE - 1)
        {
            rx_buffer[rx_index++] = data;
        }
        else
        {
            rx_index = 0;
        }
    }
}

int main(void)
{
    USART6_Init();

    while (1)
    {
        // Echo received characters
        if (rx_index > 0)
        {
            USART6_SendChar(rx_buffer[rx_index - 1]);
            rx_index = 0;
        }
    }
}

这个程序初始化了USART6，并通过USART6_SendChar函数发送字符，通过USART6_SendString函数发送字符串。USART6_IRQHandler函数处理USART6接收数据的中断，将接收到的数据存储在rx_buffer数组中。在main函数中，我们无限循环将rx_buffer中的字符回显出去。注意，这个程序只实现了USART6的收发功能，如果你需要其他功能，你需要添加相应的代码。