stm32串口fifo缓冲区程序

下面是一个使用STM32的串口FIFO缓冲区的示例程序：

#include "stm32f4xx.h"

#define BUFFER_SIZE 128

volatile uint8_t rx_buffer[BUFFER_SIZE];
volatile uint16_t rx_head = 0;
volatile uint16_t rx_tail = 0;

void USART3_IRQHandler(void)
{
    if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
    {
        rx_buffer[rx_head] = USART_ReceiveData(USART3);
        rx_head = (rx_head + 1) % BUFFER_SIZE;
    }
}

void USART_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);

    USART_InitStructure.USART_BaudRate = 115200;
    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(USART3, &USART_InitStructure);

    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    USART_Cmd(USART3, ENABLE);
}

int main(void)
{
    USART_Configuration();

    while (1)
    {
        if (rx_head != rx_tail)
        {
            // 处理接收到的数据
            uint8_t data = rx_buffer[rx_tail];
            rx_tail = (rx_tail + 1) % BUFFER_SIZE;

            // 进行其他处理...
        }
    }
}

这个示例程序演示了如何使用STM32的串口FIFO缓冲区。在中断处理函数`USART3_IRQHandler`中，接收到的数据会被存储在循环队列`rx_buffer`中，然后在主循环中进行处理。你可以根据自己的需求修改缓冲区的大小和其他串口配置参数。