Posted on July 16, 2018 at 15:54
Hello!
My name is Jason.
I have been testing USB FatFS of STM32F4-Discovery board since last week.
And I tested reference source code of STMicro.
(STM32Cube_FW_F4_V1.21.0\Projects\STM32F4-Discovery\Applications\FatFs\FatFs_USBDisk)
It seems like normal operation works well.
And all of basic FatFS functions had no problem. (f_mount, f_open, f_write, f_close).
But I found out there are too many retires between
USBH_Process() and MSC_Application().
More than 100 retries occurred until APPLICATION_START is ready state.
I think this is the reason why
MSC_Application() is located in the while() function.
Of course this can be a normal situation.
However, I never used while() function when I tested FatFS with SDIO 4-bit mode.
So I would like to know the reason why we have to use while() function for USB FatFS
Why should we use while() for
MSC_Application() function?
Please refer to attached screenshot for more details.
Have a nice day!!!
Best regards,
Jason (GMT+9, Seoul, Korea)
