Firmware for Nordic MCUs used in the Telophase Keyboard, containing the necessary hex files. This firmware is a derivative of reversebias' mitosis firmware. https://github.com/reversebias/mitosis

These instructions are for flashing hex files to the boards via OpenOCD using an ST-Link programmer. This process has been tested on Windows 10 and Linux. Alternatively, one could use NRF Studio Go and a J-Link/J-Link EDU, or the nrfjprog utility. On the Telophase/Meiosis/Helicase/Centromere, there is a 4-pin 2.54mm header that one can program the boards by either soldering a right angle header or using a pogo pin adapter without soldering.

The programming header on the side of the keyboard, VCC (3.3V) is at the outside edge:

SWCLK
SWDIO
GND
3.3V

It's best to remove the battery during long sessions of debugging, as connecting non-rechargeable 3V lithium batteries to a potentially higher-voltage source isn't recommended.

Launch a debugging session within a terminal inside of your working directory where the hex files are located:

openocd -f 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. Now open a new terminal window in the folder with your hex files and run the following commands:

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 keyboard_left.hex` | telnet localhost 4444
echo reset | telnet localhost 4444

An openocd session should be running in another terminal, as this script sends commands to it.

There are scripts in the hex file directory to flash the boards. Open a terminal window and start OpenOCD as above. Open a second terminal window, and run the appropriate script for your receiver type, or the half of the keyboard you are flashing:

./program-receiver.sh