Objective Development Forums

I would like to know which ATmegas work out of the box with VUSB.

The reason I ask is that I have been trying to get VUSB running on a ATmega644 20PU for about 3 weeks with no luck. I am going to order another ATmega from digikey. I would prefer to order one that has known success.

Thanks.

I examined the VUSB driver and verified the registers it is setting for the interrupts. THen I ran a AVR Studio simulation and verified the correct initialization of EIMSK and EICRA. I also wrote a small program to turn on a LED when INT0 was applied. THe program worked, so I know the INT0 logic is ...

I think I know what is going on, I just dont know how to fix it... I borrowed a logic analyzer from a friend and I downloaded USBlyzer. THe USBlyzer says that the "Enumeration of device failed". When I look at power up sequence on the D+/D- lines on the logic analyzer I see 6 frames of dat...

maxi This is good advice. I have the zener diodes. I have tried getting a USB interface working multiple times using the zener diode circuit. I can switch back. I am using a pair of NTE134A Zener's. Are there any special requirements for the zeners? I have a sampling HP o-scope/logic analyzer coming...

Maxi Thanks for responding. I am pulling my hair out trying to get this to work. I was a bit scatterbrained when I did the post and I now see that I left out all the details I am using a ATmega644 20PU Programmer AVRisp MKII I am implementing the hid-mouse example My circuit is as shown in the with-...

I cannot seem to get this most basic example working. I have implemented the USB using the with-zener.png example. I compiled the example using AVRstudio and AVRISPMkII. I am using an ATmega644 20PU with a 12mhz crystal. THe code compiles just fine and the hex file programs into the AVR. THe checksu...

I am attempting to compile and program using AVRStudio, but I am getting "USB device not recognized". I have started with the hid-mouse example in the example directory. In AVRstudio I basically pointed to main.c, added usbdrv as my include directory. edited and included usbconfig-prototyp...