mirror of https://github.com/midilab/uClock
midilab
8 months ago
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/*
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* USB/Uart MIDI Sync Box
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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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#include <Adafruit_TinyUSB.h> |
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#include <MIDI.h> |
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#include <uClock.h> |
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// Instantiate the MIDI interfaces
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Adafruit_USBD_MIDI usb_midi; |
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MIDI_CREATE_INSTANCE(Adafruit_USBD_MIDI, usb_midi, MIDI_USB); |
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MIDI_CREATE_INSTANCE(HardwareSerial, Serial1, MIDI); |
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// Do your rpi 2040 has a ws2812 RGB LED? set the pin!
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// otherwise keep it commented for normal LED_BUILTIN led blinking
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#define WS2812_BUILTIN_LED 16 |
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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 of 4 quarter pulse will flash longer
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bpm_blink_timer = 8; |
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ledOn(); |
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} else if ( !(tick % (24)) ) { // each quarter led on
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bpm_blink_timer = 1; |
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ledOn(); |
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} else if ( !(tick % bpm_blink_timer) ) { // get led off
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ledOff(); |
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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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MIDI.sendRealTime(midi::Clock); |
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MIDI_USB.sendRealTime(midi::Clock); |
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// blink tempo
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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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MIDI_USB.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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MIDI_USB.sendRealTime(midi::Stop); |
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} |
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void setup() { |
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#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040) |
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// Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
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TinyUSB_Device_Init(0); |
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#endif |
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// Initialize USB midi stack
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MIDI_USB.begin(MIDI_CHANNEL_OMNI); |
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// Initialize UART midi stack
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MIDI.begin(MIDI_CHANNEL_OMNI); |
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// Initialize builtin led for clock timer blinking
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initBlinkLed(); |
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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.setOnSync24(onSync24Callback); |
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// Set the callback function for MIDI Start and Stop messages.
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uClock.setOnClockStart(onClockStart);
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uClock.setOnClockStop(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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// handle midi input?
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MIDI.read(); |
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MIDI_USB.read(); |
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} |
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@ -0,0 +1,37 @@ |
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#if defined(WS2812_BUILTIN_LED) |
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#include <Adafruit_NeoPixel.h> |
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#define NUMPIXELS 1 |
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Adafruit_NeoPixel pixels(NUMPIXELS, WS2812_BUILTIN_LED, NEO_GRB + NEO_KHZ800); |
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#endif |
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// check the pinage for BUILTIN LED of your model in case LED_BUILTIN wont ligth up
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// this is valid only if you're not using rgb version ws2812 (WS2812_BUILTIN_LED)
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//#define LED_BUILTIN PIN_LED_B
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void initBlinkLed() { |
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#if defined(WS2812_BUILTIN_LED) |
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// use adafruit neo pixel
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pixels.begin(); |
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#else |
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// normal led pin
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pinMode(LED_BUILTIN, OUTPUT); |
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#endif |
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} |
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void ledOn() { |
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#if defined(WS2812_BUILTIN_LED) |
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pixels.setPixelColor(0, pixels.Color(0, 0, 20)); |
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pixels.show(); // turn the LED on (HIGH is the voltage level)
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#else |
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digitalWrite(LED_BUILTIN, LOW); |
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#endif |
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} |
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void ledOff() { |
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#if defined(WS2812_BUILTIN_LED) |
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pixels.setPixelColor(0, pixels.Color(0, 0, 0)); |
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pixels.show(); |
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#else |
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digitalWrite(LED_BUILTIN, HIGH); |
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#endif |
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} |
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@ -1,10 +1,10 @@ |
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name=uClock |
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version=2.0.0 |
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version=2.1.0 |
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author=Romulo Silva <contact@midilab.co> |
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maintainer=Romulo Silva <contact@midilab.co> |
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sentence=BPM clock generator for Arduino platform. |
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paragraph=A Library to implement BPM clock tick calls using hardware interruption. Supported and tested on AVR boards(ATmega168/328, ATmega16u4/32u4 and ATmega2560) and ARM boards(Teensy, Seedstudio XIAO M0. ESP32 and STM32) |
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paragraph=A Library to implement BPM clock tick calls using hardware interruption. Supported and tested on AVR boards(ATmega168/328, ATmega16u4/32u4 and ATmega2560) and ARM boards(RPI2040, Teensy, Seedstudio XIAO M0 and ESP32) |
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category=Timing |
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url=https://github.com/midilab/uClock |
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architectures=avr,arm,samd,stm32,esp32 |
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architectures=avr,arm,samd,stm32,esp32,rp2040 |
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includes=uClock.h |
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@ -0,0 +1,30 @@ |
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#include <Arduino.h> |
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#include "pico/sync.h" |
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// RPi-specific timer
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struct repeating_timer timer; |
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#define ATOMIC(X) { uint32_t __interrupt_mask = save_and_disable_interrupts(); X; restore_interrupts(__interrupt_mask); } |
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// forward declaration of uClockHandler
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void uClockHandler(); |
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// ISR handler -- called when tick happens
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bool handlerISR(repeating_timer *timer) |
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{ |
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uClockHandler(); |
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return true; |
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} |
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void initTimer(uint32_t init_clock) { |
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// set up RPi interrupt timer
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// todo: actually should be -init_clock so that timer is set to start init_clock us after last tick, instead of init_clock us after finished processing last tick!
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add_repeating_timer_us(init_clock, &handlerISR, NULL, &timer); |
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} |
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void setTimer(uint32_t us_interval) { |
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cancel_repeating_timer(&timer); |
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// todo: actually should be -us_interval so that timer is set to start init_clock us after last tick, instead of init_clock us after finished processing last tick!
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add_repeating_timer_us(us_interval, &handlerISR, NULL, &timer); |
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} |
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