The interphase keyboard is an iso layout adaptation of reversebias' mitosis keyboard by durburz.
Firmware for Nordic MCUs used in the Interphase Keyboard, contains precompiled .hex files, as well as sources buildable with the Nordic SDK. This firmware adapts rossica's crypto firmware for the original mitosis for the use with the interphase keyboard.
Compile the keyboard and receiver firmware yourself after setting your seed in mitosis-crypto/mitosis-crypto.h!
Tested on Ubuntu 20.04.3, but should be able to find alternatives on all distros.
sudo apt install openocd gcc-arm-none-eabi
Nordic does not allow redistribution of their SDK or components, so download and extract from their site:
https://www.nordicsemi.com/eng/nordic/Products/nRF5-SDK/nRF5-SDK-v12-zip/54291
Firmware written and tested with version 11
unzip nRF5_SDK_11.0.0_89a8197.zip -d nRF5_SDK_11
cd nRF5_SDK_11
A cofiguration file that came with the SDK needs to be changed. Assuming you installed gcc-arm with apt, the compiler root path needs to be changed in /components/toolchain/gcc/Makefile.posix, the line:
GNU_INSTALL_ROOT := /usr/local/gcc-arm-none-eabi-4_9-2015q1
Replaced with:
GNU_INSTALL_ROOT := /usr/
Inside nRF5_SDK_11/
git clone https://github.com/reversebias/mitosis
sudo cp mitosis/49-stlinkv2.rules /etc/udev/rules.d/
Plug in, or replug in the programmer after this.
The programming header on the side of the interphase keyboard, from top to bottom:
3.3v
swclck
swdio
gnd
It's best to remove the battery during long sessions of debugging, as charging non-rechargeable lithium batteries isn't recommended.
Launch a debugging session with:
openocd -f mitosis/nrf-stlinkv2.cfg
Should give you an output ending in:
Info : nrf51.cpu: hardware has 4 breakpoints, 2 watchpoints
Otherwise you likely have a loose or wrong wire.
From the factory, these chips need to be erased:
echo reset halt | telnet localhost 4444
echo nrf51 mass_erase | telnet localhost 4444
From there, the precompiled binaries can be loaded:
echo reset halt | telnet localhost 4444
echo flash write_image `readlink -f precompiled-basic-left.hex` | telnet localhost 4444
echo reset | telnet localhost 4444
To use the automatic build scripts:
cd mitosis/mitosis-keyboard-basic
./program.sh
An openocd session should be running in another terminal, as this script sends commands to it.
The precompiled qmk hex file can be flashed with avrdude. The path to the hex and the usb port may have to be adapted.
avrdude -p atmega32u4 -c avr109 -U flash:w:precompiled-basic-qmk.hex -P /dev/ttyACM0