小编kmb*_*mbm的帖子

我尝试使用DMA通道使用SPI发送数据.当我在没有DMA的情况下发送一切都没问题,但是用DMA确实是错误的.当我调试我的程序时,SPI DR寄存器始终为0.我想使用dma循环模式一直发送我的数组.有我的代码GPIO INIT:

GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(SPI_PERIPH_CLOCK, ENABLE);
RCC_AHBPeriphClockCmd(GPIO_PERIPH_CLOCK, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

GPIO_PinAFConfig(GPIOB, AF_PIN_SOURCE, GPIO_AF);

GPIO_InitStructure.GPIO_Pin = GPIO_PIN_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);

SPI INIT

SPI_I2S_DeInit(SPI1);

SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE);

DMA INIT:

    DMA_InitTypeDef dma;
    DMA_DeInit(DMA1_Channel1);
    DMA_StructInit(&dma);

    dma.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;
    dma.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    dma.DMA_PeripheralDataSize …