N32WB031 SPI+DMA发送demo

例程附件：
N32WB03x_SPI_DMA_demo.zip (211.58 KB, 下载次数: 17)

2023-2-6 11:20 上传

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GPIO配置：

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void GPIO_Configuration(void)

{

    GPIO_InitType GPIO_InitStructure;



    RCC_EnableAPB2PeriphClk(SPI_MASTER_GPIO_CLK | RCC_APB2_PERIPH_AFIO, ENABLE);



    GPIO_InitStruct(&GPIO_InitStructure);

    /* Configure SPI_MASTER pins: SCK ,MISO and MOSI */

    GPIO_InitStructure.Pin            = SPI_MASTER_PIN_SCK | SPI_MASTER_PIN_MOSI;

    GPIO_InitStructure.GPIO_Speed     = GPIO_SPEED_HIGH;

    GPIO_InitStructure.GPIO_Mode      = GPIO_MODE_AF_PP;

    GPIO_InitStructure.GPIO_Pull      = GPIO_NO_PULL;

    GPIO_InitStructure.GPIO_Alternate = SPI_MASTER_GPIO_AF;

    GPIO_InitPeripheral(SPI_MASTER_GPIO, &GPIO_InitStructure);

}

DMA配置：

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void DMA_SPI_Configuration(void)

{

    DMA_InitType DMA_InitStructure;



    RCC_EnableAHBPeriphClk(SPI_MASTER_DMA_CLK, ENABLE);

    /* SPI_MASTER_TX_DMA_CHANNEL configuration */

    DMA_DeInit(SPI_MASTER_TX_DMA_CHANNEL);

    DMA_InitStructure.PeriphAddr     = (uint32_t)&SPI_MASTER->DAT;

    DMA_InitStructure.MemAddr        = (uint32_t)SPI_Master_Tx_Buffer;

    DMA_InitStructure.Direction      = DMA_DIR_PERIPH_DST;

    DMA_InitStructure.BufSize        = BUFFER_SIZE;

    DMA_InitStructure.PeriphInc      = DMA_PERIPH_INC_DISABLE;

    DMA_InitStructure.DMA_MemoryInc  = DMA_MEM_INC_ENABLE;

    DMA_InitStructure.PeriphDataSize = DMA_PERIPH_DATA_SIZE_BYTE;

    DMA_InitStructure.MemDataSize    = DMA_MemoryDataSize_Byte;

    DMA_InitStructure.CircularMode   = DMA_MODE_NORMAL;

    DMA_InitStructure.Priority       = DMA_PRIORITY_HIGH;

    DMA_InitStructure.Mem2Mem        = DMA_M2M_DISABLE;

    DMA_Init(SPI_MASTER_TX_DMA_CHANNEL, &DMA_InitStructure);

    DMA_RequestRemap(SPI_MASTER_TX_DMA_REMAP, DMA, SPI_MASTER_TX_DMA_CHANNEL, ENABLE);

}

SPI配置：

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void SPI_Configuration(void)

{

    SPI_InitType SPI_InitStructure;



    RCC_EnableAPB2PeriphClk(SPI_MASTER_CLK, ENABLE);



    SPI_I2S_DeInit(SPI_MASTER);

    /* SPI_MASTER configuration

     * ------------------------------------------------*/

    SPI_InitStructure.DataDirection = SPI_DIR_DOUBLELINE_FULLDUPLEX;

    SPI_InitStructure.SpiMode       = SPI_MODE_MASTER;

    SPI_InitStructure.DataLen       = SPI_DATA_SIZE_8BITS;

    SPI_InitStructure.CLKPOL        = SPI_CLKPOL_HIGH;

    SPI_InitStructure.CLKPHA        = SPI_CLKPHA_SECOND_EDGE;

    SPI_InitStructure.NSS           = SPI_NSS_SOFT;

    SPI_InitStructure.BaudRatePres  = SPI_BR_PRESCALER_32;

    SPI_InitStructure.FirstBit      = SPI_FB_MSB;

    SPI_InitStructure.CRCPoly       = CRC_POLYNOMIAL;

    SPI_Init(SPI_MASTER, &SPI_InitStructure);



    /* Enable SPI_MASTER */

    SPI_Enable(SPI_MASTER, ENABLE);

}

封装SPI_DMA写函数：

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void SPI_Write_DMA(SPI_Module* SPIx, uint8_t* writePtr, uint16_t len)

{

    uint32_t timeOut = 0x1000;

    while ((SPI_I2S_GetStatus(SPIx, SPI_I2S_BUSY_FLAG) != RESET) && (timeOut--)) __NOP();  // Wait BUSY



    // SPI_I2S_ReceiveData(SPIx);  // CLear RNE



    SPI_I2S_EnableDma(SPIx, SPI_I2S_DMA_TX, DISABLE);  // Disable DMA request



    DMA_EnableChannel(SPI_MASTER_TX_DMA_CHANNEL, DISABLE); // Disable DMA

    SPI_MASTER_TX_DMA_CHANNEL->MADDR = (uint32_t)writePtr;

    SPI_MASTER_TX_DMA_CHANNEL->TXNUM = len;

    DMA_EnableChannel(SPI_MASTER_TX_DMA_CHANNEL, ENABLE);  // Enable DMA



    SPI_I2S_EnableDma(SPIx, SPI_I2S_DMA_TX, ENABLE);  // DMA Start Work

}

主函数测试：

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int main(void)

{

    log_init();



    log_info("\n this is a SPI master DMA Demo.\n");



    GPIO_Configuration();

    DMA_SPI_Configuration();

    SPI_Configuration();

        

    log_info("\n DMA Transfer start.\n");

        

    for (int i = 0; i < 3; i++) {

        SPI_Write_DMA(SPI_MASTER, SPI_Master_Tx_Buffer, BUFFER_SIZE);

                

                while (!DMA_GetFlagStatus(SPI_MASTER_TX_DMA_FLAG, SPI_MASTER_DMA)) __NOP();

    }

        

    log_info("\n DMA Transfer end.\n");



    while (1) {

    }

}

测试结果：