[M480] SPI flash as a Storage for USB MSC

[chhsieh3]

• Application: This sample code uses SPI Flash as back end storage through SPIM interface.
• BSP Version: M480 Series BSP CMSIS V3.04.000
• Hardware: NuMaker-PFM-M487 Ver 3.0

In the sample code, the M480 acts as a USB 2.0 flash drive. It uses the SPIM interface as an back end storage for SPI Flash and has a file system. This function can be used as an alternative to the SD card as a storage space. The write speed is approximately 128 bytes per second.

The user must set the storage memory starting position and the total memory space size through MSC_Init( SectorOffset, TotalSector). A Sector is 512 KB. Since the SPI Flash limit requires at least 4KB to be cleared at a time, 4KB of content is read first, and deleted and then rewritten. The USB handler is in MSC_ProcessCmd(), and M480 will perform the corresponding processing according to the received command.

You can download the sample code at https://www.nuvoton.com/resource-downlo ... 0326144017