给我一段stm32f4 spi3的dma配置代码

以下是一段基于STM32F4的SPI3 DMA配置代码：

#include "stm32f4xx.h"

#define BUFFER_SIZE 10

uint8_t tx_buffer[BUFFER_SIZE] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x12, 0x34};
uint8_t rx_buffer[BUFFER_SIZE] = {0};

int main(void)
{
    // Enable clock for SPI3 and DMA2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

    // Configure SPI3 pins
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
    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_NOPULL;
    GPIO_Init(GPIOC, &GPIO_InitStruct);

    // Connect SPI3 pins to alternate function
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource3, GPIO_AF_SPI3);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource4, GPIO_AF_SPI3);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource5, GPIO_AF_SPI3);

    // Configure SPI3
    SPI_InitTypeDef SPI_InitStruct;
    SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
    SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStruct.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
    SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStruct.SPI_CRCPolynomial = 7;
    SPI_Init(SPI3, &SPI_InitStruct);

    // Enable SPI3
    SPI_Cmd(SPI3, ENABLE);

    // Configure DMA2 Stream 0 channel 0 for SPI3 TX
    DMA_InitTypeDef DMA_InitStruct;
    DMA_InitStruct.DMA_Channel = DMA_Channel_0;
    DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&SPI3->DR;
    DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)tx_buffer;
    DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral;
    DMA_InitStruct.DMA_BufferSize = BUFFER_SIZE;
    DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStruct.DMA_Priority = DMA_Priority_High;
    DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream0, &DMA_InitStruct);

    // Configure DMA2 Stream 2 channel 0 for SPI3 RX
    DMA_InitStruct.DMA_Channel = DMA_Channel_0;
    DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&SPI3->DR;
    DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)rx_buffer;
    DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStruct.DMA_BufferSize = BUFFER_SIZE;
    DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStruct.DMA_Priority = DMA_Priority_VeryHigh;
    DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream2, &DMA_InitStruct);

    // Enable DMA2 Stream 0 and Stream 2
    DMA_Cmd(DMA2_Stream0, ENABLE);
    DMA_Cmd(DMA2_Stream2, ENABLE);

    // Wait for DMA transfer to complete
    while (DMA_GetFlagStatus(DMA2_Stream2, DMA_FLAG_TCIF2) == RESET);

    // Disable DMA2 Stream 0 and Stream 2
    DMA_Cmd(DMA2_Stream0, DISABLE);
    DMA_Cmd(DMA2_Stream2, DISABLE);

    // Disable SPI3
    SPI_Cmd(SPI3, DISABLE);

    // Disable clock for SPI3 and DMA2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, DISABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, DISABLE);

    // Infinite loop
    while (1);
}

在上面的代码中，我们首先启用了SPI3和DMA2的时钟，并且为SPI3和DMA2配置了GPIO口。然后我们初始化了SPI3和DMA2，并且将SPI3和DMA2的配置参数进行了设置。在数据传输完成后，我们禁用了DMA2 Stream 0和Stream 2，并且禁用了SPI3和DMA2的时钟。

这段代码使用了DMA来传输SPI3的数据，所以可以在SPI3传输数据时减少CPU的负担。DMA的使用可以提高系统的性能和效率。