mirror of https://github.com/midilab/uClock
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/* Uart MIDI Sync Slave Box Monitor
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*
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* This example demonstrates how to create a |
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* MIDI slave clock box with
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* monitor support using oled display |
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*
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* MIDI in must be provided via an opto-isolator to pin RX/D0
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* Tested on an Arduino Uno. |
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* |
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* You need the following libraries to make it work |
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* - Midi Library |
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* - u8g2 |
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* - uClock |
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* This example code is in the public domain. |
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* |
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* Code by midilab contact@midilab.co |
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* Example modified by Jackson Devices contact@jacksondevices.com |
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*/ |
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#include <MIDI.h> |
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#include <U8x8lib.h> |
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//
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// BPM Clock support
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//
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#include <uClock.h> |
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MIDI_CREATE_DEFAULT_INSTANCE(); |
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U8X8 * u8x8; |
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// MIDI clock, start, stop, note on and note off byte definitions - based on MIDI 1.0 Standards.
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#define MIDI_CLOCK 0xF8 |
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#define MIDI_START 0xFA |
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#define MIDI_STOP 0xFC |
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float bpm = 126.0; |
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uint8_t bpm_blink_timer = 1; |
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uint8_t clock_state = 1; |
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uint8_t clock_mode = 0; |
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void handle_bpm_led(uint32_t tick) { |
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// BPM led indicator
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if (!(tick % (96)) || (tick == 1)) { // first compass step will flash longer
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bpm_blink_timer = 8; |
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digitalWrite(LED_BUILTIN, HIGH); |
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} else if (!(tick % (24))) { // each quarter led on
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digitalWrite(LED_BUILTIN, HIGH); |
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} else if (!(tick % bpm_blink_timer)) { // get led off
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digitalWrite(LED_BUILTIN, LOW); |
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bpm_blink_timer = 1; |
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} |
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} |
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// Internal clock handlers
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void ClockOut96PPQN(uint32_t tick) { |
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// Send MIDI_CLOCK to external gears
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MIDI.sendRealTime(MIDI_CLOCK); |
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handle_bpm_led(tick); |
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} |
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void onClockStart() { |
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MIDI.sendRealTime(MIDI_START); |
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} |
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void onClockStop() { |
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MIDI.sendRealTime(MIDI_STOP); |
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digitalWrite(LED_BUILTIN, LOW); |
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} |
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// External clock handlers
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void onExternalClock() { |
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uClock.clockMe(); |
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} |
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void onExternalStart() { |
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uClock.start(); |
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} |
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void onExternalStop() { |
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uClock.stop(); |
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digitalWrite(LED_BUILTIN, LOW); |
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} |
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void setup() { |
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//
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// MIDI setup
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//
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// Initiate MIDI communications, listen to all channels, disable soft MIDI thru
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MIDI.begin(); |
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MIDI.turnThruOff(); |
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MIDI.setHandleClock(onExternalClock); |
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MIDI.setHandleStart(onExternalStart); |
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MIDI.setHandleStop(onExternalStop); |
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// An led to display MIDI reception
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pinMode(LED_BUILTIN, OUTPUT); |
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digitalWrite(LED_BUILTIN, LOW); |
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//
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// OLED setup
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// Please check you oled model to correctly init him
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// The complete list is available here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp
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//
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//u8x8 = new U8X8_SH1106_128X64_NONAME_HW_I2C(U8X8_PIN_NONE);
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u8x8 = new U8X8_SSD1306_128X64_NONAME_HW_I2C(U8X8_PIN_NONE); |
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u8x8->begin(); |
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u8x8->setFont(u8x8_font_pressstart2p_r);
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u8x8->clear(); |
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u8x8->setFlipMode(true); |
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u8x8->drawUTF8(0, 0, "uClock");
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//
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// uClock Setup
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//
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uClock.init(); |
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uClock.setClock96PPQNOutput(ClockOut96PPQN); |
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// For MIDI Sync Start and Stop
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uClock.setOnClockStartOutput(onClockStart); |
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uClock.setOnClockStopOutput(onClockStop); |
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uClock.setMode(uClock.EXTERNAL_CLOCK); |
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//uClock.setTempo(136.5);
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//uClock.start();
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} |
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void loop() { |
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while(MIDI.read()) {} |
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// DO NOT ADD MORE PROCESS HERE AT THE COST OF LOSING CLOCK SYNC
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// Since arduino make use of Serial RX interruption we need to
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// read Serial as fast as we can on the loop
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if (bpm != uClock.getTempo()) { |
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bpm = uClock.getTempo(); |
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u8x8->drawUTF8(8, 7, String(bpm, 1).c_str()); |
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u8x8->drawUTF8(8 + 5, 7, "BPM"); |
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// clear display ghost number for 2 digit
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// coming from 3 digit bpm changes
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if (bpm < 100) { |
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u8x8->drawUTF8(8 + 4, 7, " "); |
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} |
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} |
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if (clock_state != uClock.state) { |
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clock_state = uClock.state; |
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if (clock_state >= 1) { |
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u8x8->drawUTF8(0, 7, "Playing"); |
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} else { |
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u8x8->drawUTF8(0, 7, "Stopped "); |
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} |
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} |
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if (clock_mode != uClock.getMode()) { |
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clock_mode = uClock.getMode(); |
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if (clock_mode == uClock.EXTERNAL_CLOCK) { |
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u8x8->drawUTF8(10, 0, "Slave "); |
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} else { |
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u8x8->drawUTF8(10, 0, "Master"); |
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} |
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} |
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} |
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