midiLooper: A C repository from junkim012

Channels.h

track[] channels: The channels array keeps a list of tracks.
- The length of the channels array is limited by microcontroller storage.
struct track: Each track struct has a sequence array.
int[] sequence: Sequence array is the list of MIDI notes that will be sent to the computer to output.

Other variables we track:

int step: keeps track of the latest position in the sequence array that we should be appending the new MIDI note to.
- should increment based on how frequently we are listening to the MIDI input
boolean playback: whether we should be sending MIDI back to the keyboard or not (0 if no, 1 if yes)
- we should choose whether we want playback/pause for every single channel or not
int selectedChannel: modified upon reading from the digitalInput connected to each channel switch
- if channel 1 is selected, equals 1; if 2 is selected, equals 2, etc.

How MIDI Notes are being read: [discuss with TA?]

Is there a way for a C function to passively listen to MIDI input and be triggered only when the MIDI note is received from the keyboard?
Need c MIDI Library (a lot of c++ but less c)
- Arduino's MIDI library reads
  - very helpful guide: https://www.instructables.com/Send-and-Receive-MIDI-with-Arduino/
- https://github.com/PortMidi/portmidi
- https://portmedia.sourceforge.net/portmidi/

When MIDI notes are read, the function

The reset channel switch just empties the corresponding sequence array to zeroes.

UX Points

Switch Behavior
- When player presses record on a channel, it should turn playback off

Other outstanding questions (good to ask TA)

When we plug in the MIDI socket, how does the Uno recognize it?
- is it a builtin AVR library function?
- think the MIDI library handles this
can the 4 MIDI channels we have combined into one when sending to the computer?
if not how does it send 4 channels at once to the computer?

Links

junkim012/midiLooper