3 Host side of USB HID keyboard protocol implementation.
4 Only standard HID Boot mode is supported at this time. This means most of normal keyboards are supported while proprietary >6KRO and NKRO is not.
9 Circuits@Home repository is git-submoduled. Do git submodule init & update to get the content.
10 https://github.com/felis/USB_Host_Shield_2.0
13 Arduino files copied from:
14 https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}
21 $ DEV=/dev/ttyACM0 make program
23 You can see HID keyboard reports on debug output.