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155 lines
3.4 KiB
155 lines
3.4 KiB
/* USB 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 hid compilant slave clock box using
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* Teensy LC, 3.x and 4.x with
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* monitor support using oled displays
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*
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* Making use of a 250 usceconds timer to
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* handle MIDI input to avoid jitter on clock
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*
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* You need the following libraries to make it work
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* - u8g2
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* - uClock
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*
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* This example code is in the public domain.
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*/
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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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U8X8 * u8x8;
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IntervalTimer teensyTimer;
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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;
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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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{
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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 onSync24Callback(uint32_t tick) {
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// Send MIDI_CLOCK to external gears
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usbMIDI.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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usbMIDI.sendRealTime(MIDI_START);
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}
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void onClockStop() {
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usbMIDI.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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{
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uClock.clockMe();
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}
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void onExternalStart()
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{
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uClock.start();
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}
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void onExternalStop()
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{
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uClock.stop();
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}
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void setup() {
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// A led to count bpms
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pinMode(LED_BUILTIN, OUTPUT);
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//
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// MIDI setup
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//
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usbMIDI.begin();
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usbMIDI.setHandleClock(onExternalClock);
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usbMIDI.setHandleStart(onExternalStart);
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usbMIDI.setHandleStop(onExternalStop);
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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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//
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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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// Setup our clock system
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uClock.init();
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uClock.setOnSync24(onSync24Callback);
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// For MIDI Sync Start and Stop
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uClock.setOnClockStart(onClockStart);
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uClock.setOnClockStop(onClockStop);
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uClock.setMode(uClock.EXTERNAL_CLOCK);
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// make use of 250us timer to handle midi input sync
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teensyTimer.begin(handleMidiInput, 250);
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teensyTimer.priority(80);
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}
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void handleMidiInput() {
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while (usbMIDI.read()) {
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}
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}
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void 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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