Posted on July 12, 2014 at 03:32hi everyone,
how can I use the SPI3 DMA TX,the following is my configuration(it do not work):
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//IO??
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);//DMA 2????
//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* ??SPI3?? */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
/* SPI3?? */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI3, &SPI_InitStructure);
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
/* ??SPI1 */
SPI_Cmd(SPI3, ENABLE);
DMA_DeInit(DMA2_Channel2);
DMA_InitStructure.DMA_PeripheralBaseAddr = SPI3->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)leddis18;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = 100;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel2, &DMA_InitStructure);
#stm32-spi-dma
