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152 lines
3.4 KiB
152 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 with
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* monitor support using oled displays
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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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* - USB-MIDI and MIDIUSB
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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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#include <USB-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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USBMIDI_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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char bpm_str[4];
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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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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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TXLED1;
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} else if ( !(*tick % (24)) ) { // each quarter led on
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TXLED1;
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} else if ( !(*tick % bpm_blink_timer) ) { // get led off
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TXLED0;
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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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}
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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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//
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// MIDI setup
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//
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MIDI.begin();
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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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//
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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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// fine tunning adjstments for you clock slaves/host setDrift(internal, external)
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uClock.setDrift(10, 2);
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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(126.5);
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//uClock.start();
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}
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void printBpm(float _bpm, uint8_t col, uint8_t line) {
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int b = (int)_bpm;
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//int c = (int)((_bpm-b)*100);
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int c = (int)((_bpm-b)*10);
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itoa(b, bpm_str, 10);
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if (b > 99) {
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u8x8->drawUTF8(col, line, bpm_str);
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} else {
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bpm_str[2] = "\0";
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u8x8->drawUTF8(col, line, " ");
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u8x8->drawUTF8(col+1, line, bpm_str);
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}
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u8x8->drawUTF8(col+3, line, ".");
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itoa(c, bpm_str, 10);
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u8x8->drawUTF8(col+4, line, bpm_str);
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u8x8->drawUTF8(col+5, line, "bpm");
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}
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void loop() {
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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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printBpm(bpm, 8, 7);
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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, "stoped ");
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}
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}
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}
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