uClock/examples/RP2040ClockBlink/RP2040ClockBlink.ino

/* USB MIDI Sync Box - RP2040 example that just blinks LED
 *  
 * 
 * This example code is in the public domain.
 * 
 */

//#define LED_BUILTIN PIN_LED_B

#include "Adafruit_TinyUSB.h"

#include <uClock.h>

#define ATOMIC(X) { uint32_t __interrupt_mask = save_and_disable_interrupts(); X; restore_interrupts(__interrupt_mask); }

uint8_t bpm_blink_timer = 1;
void handle_bpm_led(uint32_t tick)
{
  // BPM led indicator
  if ( !(tick % (96)) || (tick == 1) ) {  // first compass step will flash longer
    bpm_blink_timer = 8;
    digitalWrite(LED_BUILTIN, LOW);
  } else if ( !(tick % (24)) ) {   // each quarter led on
    bpm_blink_timer = 1;
    digitalWrite(LED_BUILTIN, LOW);
  } else if ( !(tick % bpm_blink_timer) ) { // get led off
    digitalWrite(LED_BUILTIN, HIGH);
  }
}


// Internal clock handlers
void onSync24Callback(uint32_t tick) {
  handle_bpm_led(tick);
}

void onClockStart() {
  //MIDI_USB.sendRealTime(midi::Start);
}

void onClockStop() {
  //MIDI_USB.sendRealTime(midi::Stop);
}

void setup() {
/*#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
  TinyUSB_Device_Init(0);
#endif*/

  //MIDI_USB.begin(MIDI_CHANNEL_OMNI);

  // A led to count bpms
  pinMode(LED_BUILTIN, OUTPUT);
  /*digitalWrite(LED_BUILTIN, HIGH);
  delay(500);
  digitalWrite(LED_BUILTIN, LOW);
  delay(500);
  digitalWrite(LED_BUILTIN, HIGH);
  delay(500);
  digitalWrite(LED_BUILTIN, LOW);
  delay(500);*/

  
  Serial.begin(115200);
  /*while (!Serial)
    delay(1);*/

    // Setup our clock system

  // Inits the clock
  uClock.init();
  // Set the callback function for the clock output to send MIDI Sync message.
  uClock.setOnSync24(onSync24Callback);
  // Set the callback function for MIDI Start and Stop messages.
  uClock.setOnClockStart(onClockStart);  
  uClock.setOnClockStop(onClockStop);
  // Set the clock BPM to 126 BPM
  uClock.setTempo(60);
  // Starts the clock, tick-tac-tick-tac..
  //Serial.println("about to uClock.start()..."); Serial.flush();
  uClock.start();
  //Serial.println("uClock.start()ed!"); Serial.flush();
}

uint32_t count = 0;

// Do it whatever to interface with Clock.stop(), Clock.start(), Clock.setTempo() and integrate your environment...
void loop() {
  //MIDI_USB.read();
  //count++;
  //if (millis()%1000==0)
  //  ATOMIC(Serial.println("looped!"));
}