usbd sdcard I use the example from sdk15（usb msc）and have some problems

[syc776]

I need to operate sdcard from pc(by usb msc) and from mcu (nordic 52840) (fat32 filesystem) spi sdcard at same time ;

so i have a problem ,when i operate the sd from pc and mcu  have a hardfault err; 

[Turbo J]

Both at the same time is impossible, because they won't "see" each other's changes properly. FatFS only works when it has FULL control over the filesystem - and the PC has the same limitation.

These inconsistencies may or may not be the cause of your hard faults  -impossible to tell without looking at your source code.

[syc776]

thanks for your reply now   i have another probllem  

when detect usb is present change usb mode,at this time  i can not operate for sdcard(from fat32 mcu),

when i need to operate sdcard ,i can remove usb

like this  is ok? 

[ovrebekk]

Hi 

You should be able to access the SD card locally when the USB link is removed, that is correct. 

Is this what you are trying to do?

Best regards
Torbjørn