Hi,

I'm attempting to connect to the USB demo board using the ek demo software (CDC).

The problem I am having is to do with the usb library on the PC side of things. I have 2 endpoints for my in pipe and outpipe, they are both configured correctly and it connects and we get bing bong sounds and the works but.....

If I attempt to open the inpipe at the same time as the outpipe, then I get a windows system error from the 'CreateFile' function of 0x05 - ERROR_ACCESS_DENIED.

I can open both independently but not at the same time. I need both to be open at once so I can send data to the atmel as well as receiving data from it.

Any idea anyone?

Thanks,

Chris.

Ok, so I found the problem - maybe someone can tell me why this is happening...

I have 2 endpoints set up (IN/OUT) and they are both BULK transfer type. It seems if I change these to INTERRUPT I can open the both the inpipe and outpipe handles at the same time. Is this some kind of USB rule? Is there a way to get round this by adding an interrupt pipe and having 2 bulk pipes or alternatively one bulk pipe OUT and an interrupt pipe IN?

Oh, it appears I didn't fix it so you can ignore the post above..... Any ideas anyone, this is driving me a bit barking mad...

Bump