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LPC1754 usb mass storage
12-09-2025
10:04 PM
1,249 次查看
jalilisahar
Contributor I
I have designed a board with LPC1754 and connected a nor flash W25Q64 to it via spi. As the nor flash is not formatable to FAT16 with cmsis FileSystem, I used chan's FatFs in my project and added keil mdk usb device mass storage with cmsis driver. While connecting to pc shows device descriptor correctly and Ii is recognized as a mass storage device but windows can not specify number of disk sectors correctly. Formating and exploring it is not possible.
I have formatted it within a firmware with f_mkfs function and I am almost sure that chan's FatFs works correctly in my project.
I wonder to know if someone have any related experience?
1 回复
12-10-2025
08:51 PM
1,210 次查看
Alice_Yang
NXP TechSupport
Hello @jalilisahar
Maybe the following is one possible reason. Please check.
Windows USB Mass Storage Class (MSC) expects the logical block size to be 512 bytes by default.
Your W25Q64 is a NOR Flash (64 Mbit = 8 MB) with the following physical characteristics:
Page = 256 bytes Erase Sector = 4 KB
If the SCSI READ CAPACITY (10) command in USB MSC does not return a block length of 512 bytes, or if the FatFs diskio layer does not abstract the media as 512-byte sectors, Windows will not be able to calculate the total number of disk sectors correctly.
BR
Alice
