A tiny USB HID device to send a "Mute Microphone" command to a PC

A USB device which conforms to the USB HID spec such that it is driverless. It enumerates as a USB Input device, and when a button is pressed, it sends the PHONE MUTE command (0x2F) which lives in the Telephony (0x05) usage page. It actually sends two commands, one for the key being pressed and then, after a short pause, one for the key being released.

The PHONE MUTE USB HID command is interpreted by most telephony programs as "mute the microphone". It's handy to have a physical desktop button to do this.

This is a project for an ARM STM32F4 microcontroller (supporting USB OTG) which uses libopencm3. Some adaption is probably required for other STM32s.

• Clone (recursively) this repo.
• Adjust the GPIO and linker scripts for your specific target.
• Build using arm-gcc-embedded.
• Flash to your chosen microcontroller.

Released under the MIT license.