HID Input Report timeout on some PC's but not others.

 HID Input Report timeout on some PC's but not others.

I have written some code to request and receive HID reports from a printer based on the Coldfire MCF.

On my development machine it works fine (I am not saying the famous ... “well it works on mine”) in that I can receive the report from a non control endpoint with an overlapped Readfile call.

On my test PC it fails with a timeout.

So I got hold of the famous demo of Jan Alexson viz usbhidio_vc6 and complied it under Vis Studio 2008 on Win XP.

I was flabbergasted when I obtained the same results! It exchanges reports on demand on the one PC and not the other.

The report definition is:

uint8 report[] = {

0x05, 0xffbc, 0x09, 0x01, 0xa1, 0x01,

0x09, 0x02, 0x15, 0x00, 0x26, 0xff, 0x00, 0x95, 0xBF, 0x75, 0x08, 0x81, 0x02,

0x09, 0x03, 0x15, 0x00, 0x26, 0xff, 0x00, 0x95, 0x02, 0x91, 0x02, 0xc0
};

I have it as USB 1.1 in the HID desciptor.

Can anyone think of where else I could look for ideas .. something at the host end I guess, something not obvious.

Cheers

Stalis

 RE: HID Input Report timeout on some PC's but not others.

Ah well, sorry for wasting your time folks.

I have realised that this behaviour is just symptomatic of a flakey USB stack in the device.

Rather than waste my time wondering why the error symptoms differ from PC to PC I'll concentrate on fixing the stack.