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Old 06-04-2016, 09:19 AM
Junior Member
Join Date: Jun 2016
Posts: 2
Cool Custom-made Footswitch firmare

Hi everyone !

I was quite disappointed to discover that my 3-button footswitch was not able to handle keys like "Ctrl" or "Shift" out of the box. Then I found the alternate driver that allows to bind them.

But I was disappointed again to find that the Footswitch was not handling correctly simultaneous presses. I wanted, for one, to be able to make "word-by-word" selection ( Ctrl+Shift+Left or RightArrow).

It was obviously a firmware issue and not a USB limitation, because regular keyboards are able to do that. So I opened my Footswitch, and noted that it uses a Silicon Labs C8051F321 microcontroller. I bought a devkit from Silicon Labs, and made my own Firmware. Then I flashed my Footswitch, and everything seem to work !

Here's the firmware source code :
- I compiled it using Keil (the shareware version provided with SiliconLabs devkit).
- Supports multiple keys, whether they are modifiers (Ctrl/Shift) or regular keys.
- It also allows to bind mouse clicks instead of/along keypresses. No Autohotkey required . The device is "seen" as a compound USB device "containing" one mouse and one keyboard. You can for example bind "Ctrl + Right Click" if so you want.
- For now, it can not be configured once it has been flashed (you have to change the code to choose which key you want). If people start using it, I may invest the time to implement that feature too. I'll have to write a new "driver app" then, (or at least the specs for other people to write one). Hopefully it could be better than the actual one.
- If people want it, I could also bind mouse moves (absolute or relative), but I don't think many people would use it.

If you want to use this, you'll need a Silicon Labs C2 cable. You can find the pins here :
You'll have to connect the pins
2 - Ground
4 - C2D
7 - C2CLK
10 - 5Vin
from the cable to your footswitch, as shown in the picture linked below.

Pictures here :

Happy hacking !

Last edited by Gugli; 06-04-2016 at 03:40 PM. Reason: Adding pictures
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