Re: [Sdcc-user] ez-usb not identifying on the bus after plug-in

[panocomp <pan...@gm...>]

Alex Faveluke wrote:

>Hi,
>
>Sorry if this is off topic for this list, but I don't know where else to 
>look..
>
>I'm using SDCC to write a very simple polled communication for the EZ2131 
>chip, with the usblib API on the linux host side, fxload for programming.  
>I've got some problems with data returning out of order... like a read gets 
>the previous packet I tried to read.  Are there any good examples for simple 
>polled IO beyond what's in the Cypress book.
>  
>
Examples are in the Cypress developement kit.

>Another problem I've got is that sometimes the chip will disappear from the 
>USB system, and not respond to plugging/unplugging.. It comes up temporarily 
>as an unknown device with no endpoints then disapears again. I have to 
>completely restart my system to fix this.  Is there a way I can just request 
>the entire USB bus to reset?
>
>Thanks,
>
>Alex
>
>  
>
What hardware do you use?   Look to in linux to dmesg to see what the 
kernel recognize - unplug etc.
If the hardware is stable it looks like a software bug. The pipe 0 
messages are no longer answered by your device
due to different errors like stack overflow, disabled interrupts etc.
Bye Wolfgang