This is the ninth post of my series documenting the development of a custom firmware for the FS-i6s transmitter. In my previous post we mapped the gpios for the buttons. This time it is not a real howto/tutorial but rather a short status overview.

Codebase

I did some cleaning up of the code base and the Makefiles. I also added a stylechecker that takes care of reminding me how to properly format my code. The code can be found in the addingfrsky branch.

CC2500 module

I successfully removed the Flysky transceiver and soldered the cc2500 module to the mainboard.

For a short test i ported the OpenSky receiver code to the TX, this way i can bind the FS-i6s to my Turnigy 9x and receive data from it. It works, the cc2500 module communication works and i can sucessfully send and receive packets! yay!

Next on this front: Writing the FrSky tx code.

GUI

I also worked a bit on the user interface. I wrote a small slider demo screen for debugging and setup purposes. This is not yet calibrated data, it shows the raw analog data from the sticks.

Above the stick data you can see my ideas about the RSSI (rx+tx) and the battery visualization. Stay tuned for more 😉