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1  Using Arduino / Programming Questions / Virtual USB Keyboard stuck waiting for host on: February 06, 2011, 04:55:28 am
Hi all,

I have combined an IR-receiver (e.g. http://www.gumbolabs.org/2010/05/29/radioshack-infrared-receiver-arduino/) with the virtual USB keyboard (http://www.practicalarduino.com/projects/virtual-usb-keyboard). This allows me to turn on/off and control my htpc using the tv remote.

However, when I press a button while the pc is off, the arduino gets stuck in a while loop waiting for the USB host. Specifically, in UsbKeyboard.h:
Code:
while (!usbInterruptIsReady()) {
      // Note: We wait until we can send keystroke
      //       so we know the previous keystroke was
      //       sent.
    }

I tried to make this loop quit after a certain amount of time, but I can't call micros() from that part of the program. (I'm guessing this has to do with interrupts, but I don't really know much about that.) For now I have fixed the problem by inserting a counter and having the loop quit after 100 000 repetitions, but that's not really a clean solution. Isn't there a better way to go about doing this?

BTW, is development of Virtual Usb Keyboard still active? There are a few easy improvements to the library, like adding more keys. Especially the arrow keys should be there.

regards,
sa10
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