Firmware
For this operation you need J-Link clone programmer, like this:
All these steps need to be done with both controllers!
First of all download and install SEGGER J-Link 6.70b
And download J-Flash project
- Connect programmer's pins (VCC, GND, SWC, SWD) to PCB's pins (same pins, marked by silkscreen).
- You can connect only SWC and SWD pins, in this case, power PCB via USB-C (please, make sure that battery not installed and power switch in OFF positon).
- Connect programmer to PC via USB cable.
- Open JFlash.
- Choose Open recent project and choose project file, that you download earlier.
- Click Start J-Flash
After that:
- Connect to controller: Target --> Connect (make sure that connect between programmer and PCB is stable, hold wires tight in PCB!)
- After succesfull connect: Target --> Disconnect
Download Adafruit nRF52 bootlader
Move bootlader hex file into root directory (as example: C: disk for windows)
- Open JFlashLite, select NRF52840_XXAA if it doesn't at program start.
- Select bootloader and press Program Device, wait for flashing.
I've created separate repositories for more convenience:
Use the instructions described in these repositories
- After flashing controller you need to download ZMK firmware files:
- Extract archive, move files from groupbuy-release to a directory of your choice
- Connect only left half PCB through USB Type-C, push reset button twice
- Move jiran_ble_lite_left.uf2 file into opened explorer window (just like moving files to a USB flash drive)
- Do same step with right halve (make sure, that you moving jiran_ble_right_left.uf2 file)
After this you can freely connect your Jiran keyboard to PC!