STM32F4 FMC的DMA传输
将FPGA挂载到STM32F429的fmc上面，想用DMA将FPGA的数据直接写到SD卡里面，采用Memory到外设，这样的方式能行得通吗？求解答可以，隔壁论坛有个ST32+FPGA的牛人做了一个板子，就是用FMC来通讯。不过stm32是主、FPGA要配置成从。 已经实现功能了，把配置代码贴出来
DMA_InitTypeDef SDDMA_InitStructure;
DMA_ClearFlag(SD_SDIO_DMA_STREAM, SD_SDIO_DMA_FLAG_FEIF | SD_SDIO_DMA_FLAG_DMEIF | SD_SDIO_DMA_FLAG_TEIF | SD_SDIO_DMA_FLAG_HTIF | SD_SDIO_DMA_FLAG_TCIF);
/* DMA2 Stream3or Stream6 disable */
DMA_Cmd(SD_SDIO_DMA_STREAM, DISABLE);
/* DMA2 Stream3or Stream6 Config */
DMA_DeInit(SD_SDIO_DMA_STREAM);
SDDMA_InitStructure.DMA_Channel = SD_SDIO_DMA_CHANNEL;
SDDMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SDIO_FIFO_ADDRESS;
SDDMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)BufferSRC;
SDDMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
SDDMA_InitStructure.DMA_BufferSize = BufferSize;
SDDMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
SDDMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
SDDMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
SDDMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
SDDMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
SDDMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
SDDMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
SDDMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
SDDMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
SDDMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_INC4;
DMA_Init(SD_SDIO_DMA_STREAM, &SDDMA_InitStructure);
DMA_ITConfig(SD_SDIO_DMA_STREAM, DMA_IT_TC, ENABLE);
DMA_FlowControllerConfig(SD_SDIO_DMA_STREAM, DMA_FlowCtrl_Peripheral);
/* DMA2 Stream3or Stream6 enable */
DMA_Cmd(SD_SDIO_DMA_STREAM, ENABLE); 今天检查的过程中发现实际只写入了8189个字节，我本来是要写入32Kbyte的，在中断里加了打印，显示有个FIFO溢出错误置位了，同时DMA传输完成标志也置位了，很奇怪，看了一下官方手册上，我觉得应该是FPGA和SDIO，读写速度不匹配，导致FIFO溢出。
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