Unstable behaviour of USB memory driver

[Newdrake]

I found a very unstable behaviour of the USB driver for stick memory, in particular with this model:

4GB Hussar DE97284354

In some cases the driver doesn't accept the memory in other case the system go in Halt!
In very exceptional case the driver work fine.
These are some list of message from the driver:

I try to overcome the "Transfer timed out" error increasing the wait time, modifying this source file xhciendpoint.cpp in this way:

but without any improvement.

Do you have a suggestion how to debug/solve this issue?

[rsta2]

Unfortunately I cannot find an assertion in line 346 of the file xhciendpoint.cpp. This must be an older or patched version of Circle. This transfer timeout seems to be a followup error from the previous "Cannot get device descriptor" error, which is more important to be analyzed.

Can you please build the sample/07-usbstorage of Circle Step 49 without any additional system options (e.g. REALTIME is not allowed) set and run it. This sample does not support hot-plugging, so the USB flash drive must be connected at power on. Then please take a photo of the log lines from the beginning to the first error message. Thanks.

[Newdrake]

The sample/07-usbstorage, also usign the circle 44.2, the same of my application, works fine.
Below the log lines.

I also try commenting the //#define REALTIME, but the result is always the same.
Could be useful activating the #define NO_BUSY_WAIT?
It seem a interference with the other running system like Nucleus OS or audio frame DMA interrupt, very difficult to debug.

Could you indicate some way of investigation?

[rsta2]

This commit (especially the delay) helped to get some more USB flash drives working with Circle: f357742 The REALTIME option suppresses log messages from IRQ handlers. That's why I requested to disable it. But if there is no message, because it works, this has no effect. Normally I do not give support for systems, which use parts of Circle to implement other OSes, because I cannot overlook all details. Especially when timing comes into play, that's impossible.

[Newdrake]

Thanks a lot for this update, I'll try in this direction.

I see also the Circle 49 has lot of improvements, so it seem more convenient to update my circle to this version and try in this version the custom delay.

But compiling and running the sample/07-usbstorage I get this log:

Which could be the reason?
Could you help me to solve this?
Thanks!!

[rsta2]

On the CM4 you have to define the system option USE_XHCI_INTERNAL in Config.mk, by adding this line: DEFINE += -DUSE_XHCI_INTERNAL Be sure to have this option in your config.txt file: otg_mode=1