Objective Development Forums

Well, it could be that libusb is mistaking the LEDControl for your USBasp programmer. I have experienced similar situations under Windows when I have had connected multiple V-USB devices, probably because they all share the same VID & PID but I'm not entirely sure. The problem is resolved under...

I still can't see where the problem is but here are a few suggestions you may or may not have already tried. 1. I don't see the 100n cap anymore, I would recommend you include that as well as the 4u7 (10u should be fine btw) 2. Test resistance beetween the 'A' end of the usb cable and the actual uC...

As i remember, mega8 use #reset pin combined with another some port pin. May be use forget to pull-up reset or configure it wrong? Best regards, Saimon! There's a pull-up resistor on reset, you can see it behind the bunch of wires. I tried to just blink the led on this setup (no usb) and that worke...

Try replacing the 47uF w/ a 4.7uF cap, remove the 2nd elca, and change the lfuses to 0x1f. I also would also suggest to put the diodes/resistors on the data lines as close to the MCU as possible and get rid of the long wires after the USB connector -- your flourescent lamps will wreck havoc w/ the ...

Hmm, it's difficult to tell from the photo but it looks to my like you might not have connected D+/- to the correct pins on the uC. If it's not that then I'm afraid I can't help. Perhaps someone a bit more linux savvy can glean more from the dmesg output. In fact, I moved the D- wire from pin 3 to ...

maxi wrote:Ok, try putting the zeners on the other side of the 68R series resistors and see if that helps.

No effect unfortunately...

Here are a few pictures. The caps near the microcontroller and between the supply lines are 100nF and 47µF, not sure if there's any point in adding them twice though. The caps on the crystal are 22pF as required. Let's hope this brings to light an embarassing mistake... http://www.pieterprovoost.nl/...

It's on a breadboard. I already thought of making some pictures, I'll post them later today. I'm using Ubuntu 9.10, but I also tried my netbook which runs Ubuntu 9.04, without success. I also tried 3.3V zeners and I added capacitors but that didn't help either.

I'm having the exact same problem right now, using BZX55C3V6 500mW zeners. Could that be the problem, and should I start looking for 250mW diodes?

I forgot to post the lsusb output: Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 005 Device 002: ID 16c0:05dc VOTI USBasp AVR Programmer Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 0...

I'm trying to use the LEDControl example, but it gives me "Could not find USB device LEDControl with vid=0x16c0 pid=0x5dc". HARDWARE I'm using an atmega8 with this configuration: http://vusb.wikidot.com/local--files/hardware/level-conversion-with-zener.gif D- is connected to PD4 D+ is conn...