SD card write using SDIO (4 bit) with DMA enabled is making system fail. I suspect cyclic write of around 200 bytes at 100 Hz is leading to bus contention issue or so.
Am using sTM32F4 Discovery board with extension board for RS232 interface and SD card.RS232 is also using DMA and its priority is higher than that of SD card DMA channel priority. The tasks working on RS232 interface and SD card log are different to...