Welcome @RV97, to the community!
It seems you are looking for a solution for your entire project, and for a very old MCU at that, for which you will probably find little support in a forum. However, you can divide the project into sub-projects and think about each one.
If it's just about the IR decoder, your favourite search engine will probably help you with a search for e.g. ‘+infrared +nec +stm8 +decode’. However, I don't hold out much hope for a finished example, because most developers prefer to work with more modern 32-bit MCUs than with outdated 8-bit MCUs.
Regards
/Peter
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