nRF52840 USB MSC + FAT32

Question

Hi, 
 
 I am working on one of my application using nRF52840 DK consisting of USB MSC and NUS. In USB MSC example, 8Mbytes of flash is used as mass storage with FAT (FAT12/16). I want to the nRF840 as mass storage with other system having FAT32 support. I tried to nRF840 to my device but it is not getting detected. 
 Can you please suggest the way where I can emulate the 8MBytes of memory to some bigger size (more than 32MBytes) so that FATFS drivers can classify it as FAT32. I tried to change the detected cluster size to some bigger number in fatfs driver but need to make a change at many places. 
 Do we have any application example for USB MSC with SD card as mass storage ? 
 
 Regards, 
 Nikhil

anusha · Answer

Hi Nikhil, 
 
 You can refer to the USB MSC example here: https://infocenter.nordicsemi.com/index.jsp?topic=%252Fcom.nordic.infocenter.sdk5.v15.1.0%252Fgroup__ble__sdk__lib__advdata.html&anchor=ga81730d2df43fe79a3e3b27e79f8a3e9e 
 In this example, you can make 
 #define USE_SD_CARD 1
#define USE_FATFS_QSPI 0 
 
 Also, you need to define fatfs_init() and other functions required to perform read and write operations. You can refer to Sd card example for definition of these functions: 
 https://infocenter.nordicsemi.com/index.jsp?topic=%252Fcom.nordic.infocenter.sdk5.v15.1.0%252Fgroup__ble__sdk__lib__advdata.html&anchor=ga81730d2df43fe79a3e3b27e79f8a3e9e