我尝试使用DMA通道通过SPI发送数据。当我不使用DMA时，一切都正常，但是使用DMA时出现了问题。调试我的程序时，SPI DR寄存器始终为0。我想使用dma循环模式来持续发送我的数组。以下是我的代码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初始化
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初始化：
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);
简单主要
int main(void) {
periph_init();
while (1) {
for(int j=0; j<10000000; j++){
j++;
j--;
}
}
return 0;
}
我做错了什么？