stm32 SPI + DMA

我尝试使用DMA通道使用SPI发送数据。当我发送没有DMA一切正常，但与DMA某事是错误的。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。这里是我的代码 GPIO INIT：stm32 SPI + DMA

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 = DMA_PeripheralDataSize_HalfWord; 
    dma.DMA_MemoryBaseAddr = (uint32_t)spi_tx_buffer; 
    dma.DMA_MemoryInc = DMA_MemoryInc_Enable; 
    dma.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; 
    dma.DMA_DIR = DMA_DIR_PeripheralDST; 
    dma.DMA_BufferSize = BUFFERSIZE; 
    dma.DMA_Mode = DMA_Mode_Circular; 
    dma.DMA_M2M = DMA_M2M_Disable; 

    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE); 

    NVIC_InitTypeDef NVIC_InitStructure; 

    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; 
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6; 
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
    NVIC_Init(&NVIC_InitStructure); 

    DMA_Init(DMA1_Channel1, &dma); 
    SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE); 

    DMA_Cmd(DMA1_Channel1, ENABLE);

简约为主

int main(void) { 

periph_init(); 

while (1) {  
    for(int j=0; j<10000000; j++){ 
     j++; 
     j--; 
    } 
} 
return 0; 
}

我做错了吗？

来源

2016-11-30 kmbm

检查[this]（http://www.st.com/resource/en/reference_manual/cd00171190.pdf），第282页。我不确定您的实现是否正确，但根据数据表DMA1_Channel1'与SPI没有关系 – MrMuMu

它在第3频道工作。非常感谢。 – kmbm

@NanonA你应该发布它作为答案。 –

正如我在评论中提到的，您的SPI与DMA1_Channel1没有任何关系。根据this data sheet，您应该使用DMA1_Channel3。

来源

2016-12-01 06:13:51 MrMuMu

stm32 SPI + DMA

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