Hardware Use Nes / Snes controller on Wii

[Edizius]

Hi,
I hope here is any guy which is good in elctronics:

I have a couples of nes and snes controllers and i want to use them on the wii via the game cube port. For this i found already a Project where the task looks quite simple:
http://www.raphnet.net/electronique/x2wii/index_en.php

Anyhow, i think the cheapest / easiet way would be to use a stm32 / stm8 as there are very cheap "dev-boards" (roughly $1,50) on aliexpress, so i would like to go this way, as I would not need any aditional hardware.

Now to my question(s):
On the website linked above everithing is written in asambler, so, do I have to reprogram it or is there a way to port it to ST chips? If not, can the hex/ assembler code be used on an atmega32 as well (on the webpage there is only anounced atmega8 and atmega16)?

Thanks, Edizius