USB disconnect not detected

Frelon — Mon, 28 Apr 2008 20:27:38 GMT

Hi,

I use a MCF52210 for a USB application. My program works fine except when I remove the USB key, it is not detected.

For that, I use the following code to detect the removal (detect a reset):

if(MCF_USB_INT_STAT & MCF_USB_INT_STAT_USB_RST)

{

...

// Remove the reset condition

MCF_USB_INT_STAT = MCF_USB_INT_STAT_USB_RST | MCF_USB_INT_STAT_ATTACH;

...

}

I enable USB interrupts at initialisation like that:

MCF_USB_INT_ENB = MCF_USB_INT_ENB_SLEEP | MCF_USB_INT_ENB_TOK_DNE
| MCF_USB_INT_ENB_ERROR | MCF_USB_INT_ENB_USB_RST
| MCF_USB_INT_ENB_STALL;

Is there something wrong with that code ?

Frelon

Re: USB disconnect not detected

RichTestardi — Tue, 29 Apr 2008 12:04:17 GMT

Hi,

If you're talking to a USB key, does that mean you're in host mode? It looks like the case since you are catching an attach interrupt...

Can you actually *detect* a reset in host mode? (I thought you generated the reset in host mode.)

I think you can just detect a problem when the device goes away, and then (re)arm for the subsequent (re)attach.

At least that is what I did in my host mode driver... (In my device mode driver, otoh, I detected a reset.)

-- Rich