avr-musicbox

A simple yet powerful musicbox built on tinyAVR0

WIP

Features

• 4-voice polyphony
• stereo output
• 2op FM Synthesis
  • and PSGs (square, saw, lfsr noise)

Build and flash

Requires serialupdi to flash

PlatformIO

pio run

Makefile (Linux only?)

Install following and add to PATH

avr-gcc avr-libc avrdude

then, run make

seq format

header cmd cmd...

header

struct Header{
	uint8_t ntrks;
	uint16_t[ntrks] offset;
}

cmd

NNNNOOLL: play
	NNNN: note number 0~11
	OO: octave
	LL: length index

110000LL: rest
	LL: length index

110001XX
11001XXX
1101XXXX
111XXXXX
	

• tps 11~bit
• octave 2bit
• length 5~bit x2bit
• volume
• decay
• timbre
  • FM series 2op
    • mod index 0(sin)~7
  • pulse
    • 1/2 1/4 1/8
  • saw
  • xor noise
• push 4bit~
• if goto pop 8bit