Use the Sam2695 Dream MIDI chip

Sam2695 Dream IC is in the F256K2 and F256Jr2 only

The MIDI specification from MIDI.org can be found in the organization's website https://midi.org/specs

There are many tutorials and overview of useful MIDI commands, here is one of them: https://www.cs.cmu.edu/~music/cmsip/readings/MIDI%20tutorial%20for%20programmers.html

Here's a reference list of General MIDI instruments by number: https://www.ccarh.org/courses/253/handout/gminstruments/

Register Name	Address	Description
MIDI_STATUS	0xDDA0	Read: Bit[1] = Rx_empty, Bit[2] = Tx_empty
MIDI_FIFO_DATA_PORT	0xDDA1	read and write Data Port
MIDI_RXD_COUNT_LOW	0xDDA2	Rx FIFO Data Count LOW
MIDI_RXD_COUNT_HI	0xDDA3	Rx FIFO Data Count Hi - Only the 4 first bit are valid
MIDI_TXD_COUNT_LOW	0xDDA4	Tx FIFO Data Count LOW
MIDI_TXD_COUNT_HI	0xDDA5	Tx FIFO Data Count Hi - Only the 4 first bit are valid

Steps in order to use MIDI OUT

MIDI OUT picks data from your program and sends it out to the SAM2695 chip as well as the MIDI Out port to an external device.

Send a MIDI command through 0xDDA1 in rapid sequence.

Moderately heavy middle C to channel 0: 0x90, 0x40, 0x40
Changing the instrument of channel 0 to a Slap Bass 1: 0xC0, 0x24

Steps in order to use MIDI IN

MIDI IN takes in data from a MIDI in socket and sends it out to the SAM2695 chip. For example, a keyboard synth could be plugged in that port and drive the MIDI events.

to do: revise this with an accurate procedure.