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75 lines
1.9 KiB
75 lines
1.9 KiB
/* Uart MIDI Sync Box
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*
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* This example demonstrates how to send MIDI data via Uart
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* interface on STM32 family.
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*
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* This example code is in the public domain.
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*
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* ...
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*
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*/
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#include <uClock.h>
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// MIDI clock, start and stop 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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// the blue led
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#define LED_BUILTIN 2
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uint8_t bpm_blink_timer = 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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digitalWrite(LED_BUILTIN, HIGH);
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} else if ( !(tick % (24)) ) { // each quarter led on
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bpm_blink_timer = 1;
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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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}
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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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Serial.write(MIDI_CLOCK);
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handle_bpm_led(tick);
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}
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void onClockStart() {
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Serial.write(MIDI_START);
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}
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void onClockStop() {
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Serial.write(MIDI_STOP);
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}
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void setup() {
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// Initialize serial communication at 31250 bits per second, the default MIDI serial speed communication:
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Serial.begin(31250);
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// A led to count bpms
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pinMode(LED_BUILTIN, OUTPUT);
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// Setup our clock system
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// Inits the clock
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uClock.init();
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// Set the callback function for the clock output to send MIDI Sync message.
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uClock.setClock96PPQNOutput(ClockOut96PPQN);
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// Set the callback function for MIDI Start and Stop messages.
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uClock.setOnClockStartOutput(onClockStart);
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uClock.setOnClockStopOutput(onClockStop);
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// Set the clock BPM to 126 BPM
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uClock.setTempo(126);
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// Starts the clock, tick-tac-tick-tac...
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uClock.start();
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}
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// Do it whatever to interface with Clock.stop(), Clock.start(), Clock.setTempo() and integrate your environment...
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void loop() {
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}
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