Objective Development Forums

I used 82 ohm resistors in my project w/o a problem.

Da ist noch ein Artikel -- Universeller USB-Treiber . Nochmals 1.30 Euronen.. Das Entwickeln eines Systems mit USB-Schnittstelle ist sicher eine interessante Aufgabe wenn da nur nicht der Treiber wäre. Mit dem Schreiben dieses unumgänglichen Programms tun sich viele Hardware-Spezialisten schwer. Die...

How big is ir.data[] dimensioned ? I could see that overflowing if it's smaller than 253.

.bss segment crossing a 256b page boundary maybe ?

To compile AVR firmware you'll also need WinAVR. As for how to use libusb, check out the AVRUSBBoot project.

In windows an unknown, malf device means that the speed resitor is active but the device is not reacting or sending garbage. Invalid usbconfig.h entries or fuse/config bits set wrong are a good source for this error (assuming the hardware is wired right.)

I still have a AT89C55WD-24PC spare part but I think I can not use this chip because of the internal tact divider, is this true? Depends, usually the internal clocks have more tolerance than the USB spec allows (+/- 1.5% for low speed devices.) Use of a crystal oscilator is strongly recommended. Wh...

Skimming over your posts, how high are your IR interrupt frequencies ? It looks like your IRQ handler blocks further interrupts -- AVR-USB is very sensitive to IRQ latency, keep in mind there's a SOF packet sent by the host every 1ms (!): Interrupt latency: The application must ensure that the USB i...

This is all outlined in Device Class Definition for HID 1.11 and HID Usage Tables 1.12 found on usb.org's HID Information page.. Very good reads (hint, hint .) Edit: Whatdoyouknow -- there's a standard controller for magic carpets.. 5.7 Miscellaneous Simulation Devices Magic Carpet Simulation Device...

Can be found here.

To determine if the problem is w/ your device run usbview and check if your device sent all descriptors correctly.

I'm using a mega8 @ 5v in my project. I put 3V3 zeners on D-/D+, changed the series Rs to 82 and the ID R to 2k2 (w/ a 4k7 to GND). Works fine