Program EFM8 devices using an arduino
Thanks to jaromir-sukuba and racerxdl for working on firmware to implement C2 protocol via arduino GPIO. This work largely pulls from them.
C2 is a 2-pin protocol. Any arduino should work to implement the protocol via GPIO. Just need to make sure that the correct pins are mapped for your Arduino. Check the firmware file and change the pins to map to your device if needed. Currently, it is for Arduino Mega and maps C2D and C2CK to digital pins 2 and 3, respectively.
Program the firmware to the arduino and connect C2D, C2CK, and GND to your target device.
You need to have Python installed. Then, install some required python modules.
pip install -r requirements.txt
It is set up in a client/server model to be able to easily support programming multiple targets at the same time.
First you must run the server that will handle communication to the arduino.
python prog_server.py <serial-port> [<serial-port2> ...]
Supply a list of serial ports (you can use more than one arduino at a time) to handle programming. E.g /dev/USB1 or COM1.
Then you can finally program something using the client script.
python prog_client.py <firmware.hex> <port>
This will connect to the server and tell it to download specified firmware via specified arduino.