Objective Development Forums

Have you defined one of the *SERIAL_NUMBER defines in usbconfig.h?

There are two options: You can send custom requests to your device via libusb-win32 or you can send HID feature reports. Sending custom requests to endpoint 0 should always be possible, even if the device is connected to a class driver. Feature reports should also work, but I'm not a Windows expert ...

If the device is not recognized, there's probably a very basic communication problem. Is this the 168p? AVR-libc does not support the compatibility defines for interrupt vectors for P suffix devices any more. This means that you must either define USB_INTR_VECTOR to INT0_vect in usbconfig.h or choos...

It's best to use a new VID/PID pair, since this one has been used for a mouse before. We have reserved PID = 10203 (0x27db) VID = 5824 for keyboards.

If you have not changed the USB IDs, Windows (this is Windows, right?) may have cached the associated driver(s). This means that it will use the mouse driver instead of the keyboard driver, just because you once connected the device when it was a mouse.

Endpoint 0 is described in the USB spec. Since it MUST be a control endpoint, there is no need to add a separate descriptor for it.

If you want to use V-USB, I'd recommend to forget about the Arduino IDE and write your code directly in C. Arduino comes with the C development environment. It is possible to use V-USB with the Arduino runtime, but it's not well documented and does not work reliably (yet). So I'd not recommend it fo...

This is not suspend mode, at least according to the specs...

I don't use an external keyboard. We have old Mac keyboards with a power key, but they fail to wake my computer from power-off. The trivial reason is that there is no USB power during power-off and thus no way for the keyboard to signal anything...

My computer (a Mac) wakes up from sleep when I disconnect any device. Disconnect is indistinguishable from RESET/SE0 in the first place. So my guess was that USB RESET would wake up the host.

Sorry, I think I have mixed up J and K. Since the bus is in idle during suspend, you must change something. Otherwise the host can't detect the signal. I have never tried this myself. Have you tried commercial USB devices whether they can wake up the host? This may be a configuration option of the o...

The spec also says that the device must implement the set/get functions for this attribute. Don't know whether the default implementation handles that....

OK. The USB 1.1 spec (which you can download, it's public) says in section 7.1.7.5 Resume: A device with remote wakeup capability may not generate resume signaling unless the bus has been continuously in the Idle state for 5ms (TWTRSM). This allows the hubs to get into their Suspend state and prepar...

As far as I know, pulling D+ and D- to GND for a short period of time should suffice. This feature may have to be enabled in a descriptor, though. I'd have to read in the USB spec for details on how long to pull D+ and D- to GND and which bit in which descriptor to set...

254 bytes is the size limit of V-USB in the default configuration. If you need bigger descriptors, define USB_CFG_LONG_TRANSFERS in usbconfig.h.