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Pearl 40%

Pearl 40% is a keyboard designed by Koobaczech. It uses an Atmel ATMEGA32A MCU.

Compiling and flashing

These instructions are for building and flashing your Pearl 40% without Bootmapper Client.



(to be written, help needed)


Apart from regular QMK and AVR dependencies you need to install bootloadHID. You can install it with homebrew as follows:

$ brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb

If you don't use homebrew you can try following the compiling instructions defined below in the Linux section.


For Linux you require all regular QMK dependencies, but make sure you're using gcc-avr version 4.9 or higher. 4.8 and lower do not contain the proper definitions for ATMEGA32A MCUs and QMK will fail while attempting to compile a HEX for Pearl 40%.

E.g. you cannot compile Pearl 40% HEX on a regular Ubuntu 14.04 as gcc-avr version is maxed to 4.8 on it.

Additionally you need an operational bootloadHID binary.

You can install bootloadHID by taking the following steps:

$ git clone https://github.com/robertgzr/bootloadHID ~/tmp/bootloadHIDsrc
$ cd ~/tmp/bootloadHIDsrc/commandline
$ make VENDORID=0x16c0 PRODUCTID=0x05DF # vid and pid for atmega32a
$ chmod +x bootloadHID && cp bootloadHID /usr/bin/bootloadHID

Running which bootloadHID should return /usr/bin/bootloadHID.


Enter the QMK root directory and compile a keymap with the following command:

$ make pearl:<keymap>

where <keymap> is a layout directory under the pearl directory.

QMK should compile a HEX (called pearl_<keymap>.hex) for you, which you can flash using bootloadHID.


To enable Pearl 40% bootloading mode, unplug the keyboard, then plug it in while holding Esc at the same time (the top-leftmost switch on the PCB, next to the USB connector). Once the board is in bootload mode, issue the following command (you might require sudo to perform the command):

# assuming we're still in the QMK root dir where you compiled a HEX into
$ bootloadHID -r ./pearl_<keymap>.hex

You should see something similar to

> Page size = <value>
> Device size = <value>; <value> remaining
> Uploading <value> bytes starting at 0 (0x0)
> <value> ... <current value>

where <current value> should be slowly increasing as the HEX is being flashed to the board. If there is some warning about resource busy it should still work OK.

Once done the board underglow should turn red and the new firmware has been flashed. If you can't type on the board try plugging it in again (without holding any keys to prevent accidentally setting it into bootload mode again).