Here’s some example codes from Shiru’s website…(the link near the top that says “these small example programs” ).
https://shiru.untergrund.net/articles/programming_nes_games_in_c.htm
I have a copy that works with the version I’ve been using for the past 2 years, cc65 version 2.15
http://dl.dropboxusercontent.com/s/j80n6b9gfjntfip/cc65_examples.zip
You can import a MIDI file to famitracker (an older version). I discussed it on this post.
https://nesdoug.com/2016/01/24/25-importing-a-midi-to-famitracker/
You can download the famitracker here (4.2 is the last version that imported MIDI)
http://famitracker.com/downloads.php
.
Other projects in C.
Mojon Twins
https://github.com/mojontwins/MK1_NES
.
cppchriscpp
https://github.com/cppchriscpp/nes-starter-kit
.
.
Famitone Updates
I wrote 2 unofficial updates to the famitone music driver. NOTE. I fixed the bugs (I think).
famitone 3, which adds all notes and a volume column (sacrifices some efficiency in size and speed).
https://github.com/nesdoug/famitone3.3
And famitone 4, which adds 1xx, 2xx, and 4xx effect support.
https://github.com/nesdoug/famitone4.1
And famitone 5, which adds 3xx, Qxx, Rxx, duty cycles, and sfx > 256 bytes.
https://github.com/nesdoug/famitone5.0
I have used these in some of my games. Jammin Honey and Flappy Jack, for example.
I added some other features and bug fixes, which I put in the original version also…
https://github.com/nesdoug/famitone2d
Changes:
-added song names to file output
-added command line switch -allin prevents removal of unused instruments
-added command line switch -Wno suppresses warnings about unsupported effects
Bugfixes:
-multiple D00 effects (different channels) incorrect pattern length
-Bxx below D00 effect (different channels) incorrect pattern length
-Bxx loop back causing wrong instrument inserted at loop point
example of new switches:
text2vol filename.txt -ca65 -allin -Wno
nesdoug 