implement serial MIDI interface
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105388310b
commit
a7bc05506d
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@ -0,0 +1,3 @@
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[submodule "ArduinoMIDI"]
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path = ArduinoMIDI
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url = https://github.com/FortySevenEffects/arduino_midi_library
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@ -0,0 +1 @@
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Subproject commit d501f4bb3dfff548a7cef4d85371bec0b438bdd7
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1
Makefile
1
Makefile
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@ -23,6 +23,7 @@ VPATH := $(foreach path, ${VPATH}, ${path} $(shell find ${path} -type d))
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# This is to prevent the command above from including directories like .git into
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# the VPATH list
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VPATH += ${PWD} \
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${PWD}/ArduinoMIDI/src \
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# Build parameters
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BUILD_DIR := out
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65
main.cpp
65
main.cpp
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@ -1,8 +1,11 @@
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#include <Arduino.h>
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#include <MIDI.h>
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#include "motor_control.h"
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#define NUM_MOTORS 4
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using namespace midi;
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MotorControl motors[NUM_MOTORS] = {
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MotorControl(5, 2),
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MotorControl(6, 3),
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@ -10,6 +13,18 @@ MotorControl motors[NUM_MOTORS] = {
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MotorControl(13, 12)
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};
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// MIDI setup
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struct MySerialMIDISettings {
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// ttymidi wants a baud rate of 115200
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static const long BaudRate = 115200;
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};
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typedef SerialMIDI<HardwareSerial, MySerialMIDISettings> MySerialMIDI;
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MySerialMIDI serialMIDI(Serial);
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MidiInterface<MySerialMIDI> MIDI(serialMIDI);
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void handle_tick(unsigned long cur_micros) {
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// Randomize the order we process motor ticks every time
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// This helps reduce the minor frequency discrepancies between each motor
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@ -19,6 +34,20 @@ void handle_tick(unsigned long cur_micros) {
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}
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}
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#define ASSERT_CHANNEL() \
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if (channel <= 0) return; \
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if (channel - 1 > NUM_MOTORS) return;
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void midi_note_on(uint8_t channel, uint8_t note, uint8_t velocity) {
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ASSERT_CHANNEL();
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motors[channel - 1].TickAtPitch(note);
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}
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void midi_note_off(uint8_t channel, uint8_t note, uint8_t velocity) {
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ASSERT_CHANNEL();
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motors[channel - 1].TickOff();
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}
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int main() {
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// Arduino library initialization
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// Needed for some functions to work (like micros)
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@ -33,39 +62,17 @@ int main() {
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motors[i].Init();
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}
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// Test: play Twinkle Twinkle Little Star
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unsigned long note_time = 500ul * 1000ul; // 500 ms
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unsigned int seq_motor[4][15] = {
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{ 60, 60, 67, 67, 69, 69, 67, 0, 65, 65, 64, 64, 62, 62, 60 },
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{ 57, 57, 64, 64, 65, 65, 64, 0, 62, 62, 60, 60, 59, 59, 57},
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
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{ 48, 48, 53, 53, 48, 48, 0, 0, 53, 53, 48, 48, 55, 55, 48},
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};
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unsigned long last_note_ts = 0;
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int cur_note = -1;
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// Start serial MIDI interface
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MIDI.begin(MIDI_CHANNEL_OMNI);
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// Set up MIDI callbacks
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MIDI.setHandleNoteOn(midi_note_on);
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MIDI.setHandleNoteOff(midi_note_off);
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while (true) {
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unsigned long cur_micros = micros();
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handle_tick(cur_micros);
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if (cur_micros - last_note_ts >= note_time) {
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last_note_ts = cur_micros;
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cur_note += 1;
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for (int i = 0; i < 4; i++) {
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if (seq_motor[i][cur_note] != 0) {
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motors[i].TickAtPitch(seq_motor[i][cur_note]);
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} else {
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motors[i].TickOff();
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}
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// Prevent out of bounds access
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if (cur_note >= 15) {
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motors[i].TickOff();
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while (true) {}
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}
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}
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}
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MIDI.read();
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}
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return 0;
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