SDIO_MSC_DMA

USB sd card reader using STM32f407vet6 dev board.

Notes:

• SDIO clock using APB2 clock bus.
• NVIC DMA interrupts priority should be less then SDIO interrupt priority.
• SDIO in polling mode using maximum clock speed about 5 MHz.
• SDIO in DMA mode using maximum clock speed about 24 MHz.
• Cube autoconfig initialization bug. DMA_INIT should be first init entry, otherwize HAL_SD_READ/WRITE_DMA would stuck in infinite busy loop.

Changed files:

• Core/main.c
• USB_DEVICE/App/usbd_storage_if.c