stm32 SPI DMA发送代码 标准库

以下是基于STM32标准库的SPI DMA发送代码：

#include "stm32f10x.h"

#define SPI_PORT        SPI2
#define DMA_CHANNEL     DMA1_Channel5
#define BUFFER_SIZE     16

uint8_t tx_buffer[BUFFER_SIZE] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10};
uint8_t rx_buffer[BUFFER_SIZE];

void SpiDmaSend(void) {
    /* Enable DMA clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    /* Enable SPI clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

    /* Configure SPI pins */
    GPIO_InitTypeDef gpio_init;
    gpio_init.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
    gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &gpio_init);

    /* Configure SPI */
    SPI_InitTypeDef spi_init;
    spi_init.SPI_Direction = SPI_Direction_1Line_Tx;
    spi_init.SPI_Mode = SPI_Mode_Master;
    spi_init.SPI_DataSize = SPI_DataSize_8b;
    spi_init.SPI_CPOL = SPI_CPOL_Low;
    spi_init.SPI_CPHA = SPI_CPHA_1Edge;
    spi_init.SPI_NSS = SPI_NSS_Soft;
    spi_init.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
    spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_Init(SPI_PORT, &spi_init);

    /* Enable SPI */
    SPI_Cmd(SPI_PORT, ENABLE);

    /* Configure DMA */
    DMA_InitTypeDef dma_init;
    dma_init.DMA_PeripheralBaseAddr = (uint32_t)&SPI_PORT->DR;
    dma_init.DMA_MemoryBaseAddr = (uint32_t)tx_buffer;
    dma_init.DMA_DIR = DMA_DIR_PeripheralDST;
    dma_init.DMA_BufferSize = BUFFER_SIZE;
    dma_init.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    dma_init.DMA_MemoryInc = DMA_MemoryInc_Enable;
    dma_init.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    dma_init.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    dma_init.DMA_Mode = DMA_Mode_Normal;
    dma_init.DMA_Priority = DMA_Priority_VeryHigh;
    dma_init.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA_CHANNEL, &dma_init);

    /* Enable DMA transfer complete interrupt */
    DMA_ITConfig(DMA_CHANNEL, DMA_IT_TC, ENABLE);

    /* Start DMA transfer */
    DMA_Cmd(DMA_CHANNEL, ENABLE);

    /* Wait for DMA transfer to complete */
    while (DMA_GetFlagStatus(DMA1_FLAG_TC5) == RESET);

    /* Disable DMA and SPI */
    DMA_Cmd(DMA_CHANNEL, DISABLE);
    SPI_Cmd(SPI_PORT, DISABLE);

    /* Disable DMA clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, DISABLE);
}

/* DMA1 Channel5 Interrupt Handler */
void DMA1_Channel5_IRQHandler(void) {
    if (DMA_GetITStatus(DMA1_IT_TC5)) {
        /* Clear the DMA transfer complete interrupt flag */
        DMA_ClearFlag(DMA1_FLAG_TC5);

        /* Disable DMA transfer complete interrupt */
        DMA_ITConfig(DMA_CHANNEL, DMA_IT_TC, DISABLE);
    }
}

在主函数中，调用`SpiDmaSend()`函数即可实现SPI DMA发送。注意，在代码中使用了DMA1 Channel5和SPI2，如需更改，请自行更改代码。