STM32 uart 中断fifo 接收数组例程 标准库

以下是一个基于STM32标准库的UART中断接收FIFO数组例程：

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

#define RX_BUFFER_SIZE 256

volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
volatile uint16_t rx_index = 0;

void USART2_IRQHandler(void)
{
    if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
    {
        uint8_t rx_data = USART_ReceiveData(USART2);
        if(rx_index < RX_BUFFER_SIZE)
        {
            rx_buffer[rx_index++] = rx_data;
        }
    }
}

int main(void)
{
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    // Enable peripheral clocks
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    // Configure USART2 Tx (PA2) as alternate function push-pull
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);

    // Configure USART2 Rx (PA3) as input floating
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);

    // Configure USART2
    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(USART2, &USART_InitStructure);

    // Enable USART2 RX interrupt
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

    // Configure NVIC for USART2 interrupt
    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // Enable USART2
    USART_Cmd(USART2, ENABLE);

    while(1)
    {
        // Check if there is any data in the buffer
        if(rx_index > 0)
        {
            // Process the received data
            uint8_t rx_data[RX_BUFFER_SIZE];
            memcpy(rx_data, rx_buffer, rx_index); // Copy the data to a temporary buffer
            rx_index = 0; // Reset the index
            // Do something with the received data
        }
    }
}

在这个例程中，我们使用USART2作为例子，可以根据需要进行修改。代码中使用了一个256字节的接收缓冲区，当接收到一个字节时，将其放入缓冲区中，并将接收指针加一。当需要处理接收到的数据时，将缓冲区中的数据复制到一个临时数组中，并将接收指针重置为0。可以在主循环中处理接收到的数据。