Merge pull request #9 from midilab/xiao-support

seedstudio xiao m0 support

README.md

@@ -1,6 +1,6 @@
 # uClock
 
-**BPM clock generator for Arduino and Teensy** is a library to implement BPM clock tick calls using **hardware interruption** for tight and solid timing clock ticks. Tested on ATmega168/328, ATmega16u4/32u4, ATmega2560 and Teensy LC.
+**BPM clock generator for Arduino and Teensy** is a library to implement BPM clock tick calls using **hardware interruption** for tight and solid timing clock ticks. Tested on ATmega168/328, ATmega16u4/32u4, ATmega2560, Teensy ARM boards and Seedstudio XIAO M0.
 
 Generate your self tight BPM clock for music, audio/video productions, performances or installations. You can clock your MIDI setup or sync different protocols as you wish.
 
@@ -34,7 +34,7 @@ Here is an example on how to create a simple MIDI Sync Box on Arduino boards
 #define MIDI_STOP  0xFC
 
 // The callback function wich will be called by Clock each Pulse of 96PPQN clock resolution.
-void ClockOut96PPQN(uint32_t * tick) {
+void ClockOut96PPQN(uint32_t tick) {
   // Send MIDI_CLOCK to external gears
   Serial.write(MIDI_CLOCK);
 }
@@ -81,7 +81,7 @@ An example on how to create a simple MIDI Sync Box on Teensy boards and USB Midi
 #include <uClock.h>
 
 // The callback function wich will be called by Clock each Pulse of 96PPQN clock resolution.
-void ClockOut96PPQN(uint32_t * tick) {
+void ClockOut96PPQN(uint32_t tick) {
   // Send MIDI_CLOCK to external gears
   usbMIDI.sendRealTime(usbMIDI.Clock);
 }
@@ -185,13 +185,13 @@ void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2)
 }
 
 // The callback function wich will be called by uClock each Pulse of 16PPQN clock resolution. Each call represents exactly one step.
-void ClockOut16PPQN(uint32_t * tick) 
+void ClockOut16PPQN(uint32_t tick) 
 {
   uint16_t step;
   uint16_t length = NOTE_LENGTH;
   
   // get actual step.
-  _step = *tick % _step_length;
+  _step = tick % _step_length;
   
   // send note on only if this step are not in rest mode
   if ( _sequencer[_step].rest == false ) {
@@ -223,7 +223,7 @@ void ClockOut16PPQN(uint32_t * tick)
 }
 
 // The callback function wich will be called by uClock each Pulse of 96PPQN clock resolution.
-void ClockOut96PPQN(uint32_t * tick) 
+void ClockOut96PPQN(uint32_t tick) 
 {
   // Send MIDI_CLOCK to external hardware
   Serial.write(MIDI_CLOCK);

examples/AcidStepSequencer/AcidStepSequencer.ino

@@ -64,13 +64,13 @@ void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2)
 }
 
 // The callback function wich will be called by uClock each Pulse of 16PPQN clock resolution. Each call represents exactly one step.
-void ClockOut16PPQN(uint32_t * tick) 
+void ClockOut16PPQN(uint32_t tick) 
 {
   uint16_t step;
   uint16_t length = NOTE_LENGTH;
   
   // get actual step.
-  _step = *tick % _step_length;
+  _step = tick % _step_length;
   
   // send note on only if this step are not in rest mode
   if ( _sequencer[_step].rest == false ) {
@@ -102,7 +102,7 @@ void ClockOut16PPQN(uint32_t * tick)
 }
 
 // The callback function wich will be called by uClock each Pulse of 96PPQN clock resolution.
-void ClockOut96PPQN(uint32_t * tick) 
+void ClockOut96PPQN(uint32_t tick) 
 {
   // Send MIDI_CLOCK to external hardware
   Serial.write(MIDI_CLOCK);

examples/LeonardoUsbSlaveMidiClockMonitor/LeonardoUsbSlaveMidiClockMonitor.ino

@@ -34,22 +34,22 @@ uint8_t bpm_blink_timer = 1;
 uint8_t clock_state = 1;
 uint8_t clock_mode = 0;
 
-void handle_bpm_led(uint32_t * tick)
+void handle_bpm_led(uint32_t tick)
 {
   // BPM led indicator
-  if ( !(*tick % (96)) || (*tick == 1) ) {  // first compass step will flash longer
+  if ( !(tick % (96)) || (tick == 1) ) {  // first compass step will flash longer
     bpm_blink_timer = 8;
     TXLED1;
-  } else if ( !(*tick % (24)) ) {   // each quarter led on
+  } else if ( !(tick % (24)) ) {   // each quarter led on
     TXLED1;
-  } else if ( !(*tick % bpm_blink_timer) ) { // get led off
+  } else if ( !(tick % bpm_blink_timer) ) { // get led off
     TXLED0;
     bpm_blink_timer = 1;
   }
 }
 
 // Internal clock handlers
-void ClockOut96PPQN(uint32_t * tick) {
+void ClockOut96PPQN(uint32_t tick) {
   // Send MIDI_CLOCK to external gears
   MIDI.sendRealTime(MIDI_CLOCK);
   handle_bpm_led(tick);

examples/MidiClock/MidiClock.ino

@@ -7,7 +7,7 @@
 #define MIDI_STOP  0xFC
 
 // The callback function wich will be called by Clock each Pulse of 96PPQN clock resolution.
-void ClockOut96PPQN(uint32_t * tick) 
+void ClockOut96PPQN(uint32_t tick) 
 {
   // Send MIDI_CLOCK to external gears
   Serial.write(MIDI_CLOCK);

examples/TeensyUsbMasterMidiClock/TeensyUsbMasterMidiClock.ino

@@ -21,22 +21,22 @@
 #include <uClock.h>
 
 uint8_t bpm_blink_timer = 1;
-void handle_bpm_led(uint32_t * tick)
+void handle_bpm_led(uint32_t tick)
 {
   // BPM led indicator
-  if ( !(*tick % (96)) || (*tick == 1) ) {  // first compass step will flash longer
+  if ( !(tick % (96)) || (tick == 1) ) {  // first compass step will flash longer
     bpm_blink_timer = 8;
     digitalWrite(LED_BUILTIN, HIGH);
-  } else if ( !(*tick % (24)) ) {   // each quarter led on
+  } else if ( !(tick % (24)) ) {   // each quarter led on
     digitalWrite(LED_BUILTIN, HIGH);
-  } else if ( !(*tick % bpm_blink_timer) ) { // get led off
+  } else if ( !(tick % bpm_blink_timer) ) { // get led off
     digitalWrite(LED_BUILTIN, LOW);
     bpm_blink_timer = 1;
   }
 }
 
 // Internal clock handlers
-void ClockOut96PPQN(uint32_t * tick) {
+void ClockOut96PPQN(uint32_t tick) {
   // Send MIDI_CLOCK to external gears
   usbMIDI.sendRealTime(usbMIDI.Clock);
   handle_bpm_led(tick);

examples/TeensyUsbSlaveMidiClock/TeensyUsbSlaveMidiClock.ino

@@ -24,19 +24,19 @@ 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
+  if ( !(tick % (96)) || (tick == 1) ) {  // first compass step will flash longer
     bpm_blink_timer = 8;
     digitalWrite(LED_BUILTIN, HIGH);
-  } else if ( !(*tick % (24)) ) {   // each quarter led on
+  } else if ( !(tick % (24)) ) {   // each quarter led on
     digitalWrite(LED_BUILTIN, HIGH);
-  } else if ( !(*tick % bpm_blink_timer) ) { // get led off
+  } else if ( !(tick % bpm_blink_timer) ) { // get led off
     digitalWrite(LED_BUILTIN, LOW);
     bpm_blink_timer = 1;
   }
 }
 
 // Internal clock handlers
-void ClockOut96PPQN(uint32_t * tick) {
+void ClockOut96PPQN(uint32_t tick) {
   // Send MIDI_CLOCK to external gears on other port?
   //usbMIDI.sendRealTime(usbMIDI.Clock);
   handle_bpm_led(tick);

examples/TeensyUsbSlaveMidiClockMonitor/TeensyUsbSlaveMidiClockMonitor.ino

@@ -37,19 +37,19 @@ uint8_t clock_state = 1;
 void handle_bpm_led(uint32_t * tick)
 {
   // BPM led indicator
-  if ( !(*tick % (96)) || (*tick == 1) ) {  // first compass step will flash longer
+  if ( !(tick % (96)) || (tick == 1) ) {  // first compass step will flash longer
     bpm_blink_timer = 8;
     digitalWrite(LED_BUILTIN, HIGH);
-  } else if ( !(*tick % (24)) ) {   // each quarter led on
+  } else if ( !(tick % (24)) ) {   // each quarter led on
     digitalWrite(LED_BUILTIN, HIGH);
-  } else if ( !(*tick % bpm_blink_timer) ) { // get led off
+  } else if ( !(tick % bpm_blink_timer) ) { // get led off
     digitalWrite(LED_BUILTIN, LOW);
     bpm_blink_timer = 1;
   }
 }
 
 // Internal clock handlers
-void ClockOut96PPQN(uint32_t * tick) {
+void ClockOut96PPQN(uint32_t tick) {
   // Send MIDI_CLOCK to external gears
   usbMIDI.sendRealTime(MIDI_CLOCK);
   handle_bpm_led(tick);

examples/XiaoUsbMasterMidiClock/XiaoUsbMasterMidiClock.ino

@@ -0,0 +1,81 @@
+/* USB MIDI Sync Box
+ *  
+ * This example demonstrates how to change the USB MIDI 
+ * device name on Teensy LC and 3.x.  When creating more
+ * that one MIDI device, custom names are much easier to
+ * use when selecting each device in MIDI software on
+ * your PC or Mac.  The custom name is in the "name.c" tab.
+ *
+ * Windows and Macintosh systems often cache USB info.
+ * After changing the name, you may need to test on a
+ * different computer to observe the new name, or take
+ * steps to get your operating system to "forget" the
+ * cached info.  (TODO: wanted... can anyone contribute
+ * instructions for these systems)
+ * 
+ * This example code is in the public domain.
+ */
+#include <Adafruit_TinyUSB.h>
+#include <MIDI.h>
+
+Adafruit_USBD_MIDI usb_midi;
+MIDI_CREATE_INSTANCE(Adafruit_USBD_MIDI, usb_midi, MIDI);
+
+#include <uClock.h>
+
+/*
+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, HIGH);
+  } else if ( !(tick % (24)) ) {   // each quarter led on
+    digitalWrite(LED_BUILTIN, HIGH);
+  } else if ( !(tick % bpm_blink_timer) ) { // get led off
+    digitalWrite(LED_BUILTIN, LOW);
+    bpm_blink_timer = 1;
+  }
+}
+*/
+
+// Internal clock handlers
+void ClockOut96PPQN(uint32_t tick) {
+  // Send MIDI_CLOCK to external gears
+  //MIDI.sendRealTime(MIDI.Clock);
+  //handle_bpm_led(tick);
+}
+
+void onClockStart() {
+  //MIDI.sendRealTime(MIDI.Start);
+}
+
+void onClockStop() {
+  //MIDI.sendRealTime(MIDI.Stop);
+}
+
+void setup() {
+  MIDI.begin(MIDI_CHANNEL_OMNI);
+
+  // A led to count bpms
+  //pinMode(LED_BUILTIN, OUTPUT);
+  
+  // Setup our clock system
+  // Inits the clock
+  uClock.init();
+  // Set the callback function for the clock output to send MIDI Sync message.
+  uClock.setClock96PPQNOutput(ClockOut96PPQN);
+  // Set the callback function for MIDI Start and Stop messages.
+  uClock.setOnClockStartOutput(onClockStart);  
+  uClock.setOnClockStopOutput(onClockStop);
+  // Set the clock BPM to 126 BPM
+  uClock.setTempo(126);
+  // Starts the clock, tick-tac-tick-tac...
+  uClock.start();
+}
+
+// Do it whatever to interface with Clock.stop(), Clock.start(), Clock.setTempo() and integrate your environment...
+void loop() {
+
+}

library.properties

@@ -1,10 +1,10 @@
 name=uClock
-version=1.0.0
+version=1.1.0
 author=Romulo Silva <contact@midilab.co>
 maintainer=Romulo Silva <contact@midilab.co>
 sentence=BPM clock generator for Arduino and Teensy boards
-paragraph=A Library to implement BPM clock tick calls using hardware interruption. Tested on ATmega168/328, ATmega16u4/32u4, ATmega2560 and Teensy ARM boards.
+paragraph=A Library to implement BPM clock tick calls using hardware interruption. Tested on ATmega168/328, ATmega16u4/32u4, ATmega2560, Teensy ARM boards and Seedstudio XIAO M0
 category=Timing
 url=https://github.com/midilab/uClock
-architectures=avr,arm
+architectures=avr,arm,samd
 includes=uClock.h

src/uClock.cpp

@@ -1,10 +1,10 @@
 /*!
  *  @file       uClock.cpp
  *  Project     BPM clock generator for Arduino
- *  @brief      A Library to implement BPM clock tick calls using hardware timer interruption. Tested on ATmega168/328, ATmega16u4/32u4 and ATmega2560 and Teensy LC.
+ *  @brief      A Library to implement BPM clock tick calls using hardware timer interruption. Tested on ATmega168/328, ATmega16u4/32u4, ATmega2560, Teensy ARM boards and Seedstudio XIAO M0
- *  @version    1.0.0
+ *  @version    1.1.0
  *  @author     Romulo Silva
- *  @date       01/04/2022
+ *  @date       04/03/2022
  *  @license    MIT - (c) 2022 - Romulo Silva - contact@midilab.co
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -30,29 +30,26 @@
 // 
 // Timer setup for work clock
 //
-#if defined(TEENSYDUINO) && !defined(__AVR_ATmega32U4__)
+// all non-avr timmers setup
+// Teensyduino port
+#if defined(TEENSYDUINO)
 IntervalTimer _uclockTimer;
-void uclockISR();
+#endif
-void uclockInitTimer()
+// Seedstudio XIAO M0 port
-{
+#if defined(SEEED_XIAO_M0)
-	ATOMIC(
+// 24 bits timer
+#include <TimerTCC0.h>
+#define _uclockTimer TimerTcc0
+// 16 bits timer
+//#include <TimerTC3.h>
+//#define _uclockTimer TimerTc3
+#endif
 
-	// begin at 120bpm (20833us)
+#if defined(ARDUINO_ARCH_AVR)
-	_uclockTimer.begin(uclockISR, 20833); 
-
-	// Set the interrupt priority level, controlling which other interrupts
-	// this timer is allowed to interrupt. Lower numbers are higher priority, 
-	// with 0 the highest and 255 the lowest. Most other interrupts default to 128. 
-	// As a general guideline, interrupt routines that run longer should be given 
-	// lower priority (higher numerical values).
-	_uclockTimer.priority(0);
-	)
-}
-#else
 void uclockInitTimer()
 {
 	ATOMIC(
-		// Timer1 init
+		// 16bits Timer1 init
 		// begin at 120bpm (48.0007680122882 Hz)
 		TCCR1A = 0; // set entire TCCR1A register to 0
 		TCCR1B = 0; // same for TCCR1B
@@ -67,6 +64,30 @@ void uclockInitTimer()
 		TIMSK1 |= (1 << OCIE1A);
 	)
 }
+#else
+void uclockISR();
+void uclockInitTimer()
+{
+	// begin at 120bpm (20833us)
+	const uint16_t init_clock = 20833;
+	#if defined(TEENSYDUINO)
+		_uclockTimer.begin(uclockISR, init_clock); 
+
+		// Set the interrupt priority level, controlling which other interrupts
+		// this timer is allowed to interrupt. Lower numbers are higher priority, 
+		// with 0 the highest and 255 the lowest. Most other interrupts default to 128. 
+		// As a general guideline, interrupt routines that run longer should be given 
+		// lower priority (higher numerical values).
+		_uclockTimer.priority(0);
+	#endif
+
+	#if defined(SEEED_XIAO_M0)
+		_uclockTimer.initialize(init_clock);
+
+		// attach to generic uclock ISR
+		_uclockTimer.attachInterrupt(uclockISR);
+	#endif
+}
 #endif
 
 namespace umodular { namespace clock {
@@ -150,14 +171,11 @@ void uClockClass::pause()
 void uClockClass::setTimerTempo(float bpm) 
 {
 	// 96 ppqn resolution
-	tick_us_interval = (60000000 / 24 / bpm);
+	uint32_t tick_us_interval = (60000000 / 24 / bpm);
-	tick_hertz_interval = 1/((float)tick_us_interval/1000000);
+
+#if defined(ARDUINO_ARCH_AVR)
+	float tick_hertz_interval = 1/((float)tick_us_interval/1000000);
 
-#if defined(TEENSYDUINO) && !defined(__AVR_ATmega32U4__)
-	ATOMIC(
-		_uclockTimer.update(tick_us_interval);
-	)
-#else
 	uint32_t ocr;
 	uint8_t tccr = 0;
 
@@ -188,6 +206,14 @@ void uClockClass::setTimerTempo(float bpm)
 		TCCR1B |= (1 << WGM12);
 		TCCR1B |= tccr;
 	)
+#else
+	#if defined(TEENSYDUINO)
+		_uclockTimer.update(tick_us_interval);
+	#endif
+
+	#if defined(SEEED_XIAO_M0)
+		_uclockTimer.setPeriod(tick_us_interval);
+	#endif
 #endif
 }
 
@@ -201,9 +227,12 @@ void uClockClass::setTempo(float bpm)
 		return;
 	}
 
+	ATOMIC(
+		tempo = bpm
+	)
+
 	setTimerTempo(bpm);
 	
-	tempo = bpm;
 }
 
 float inline uClockClass::freqToBpm(uint32_t freq)
@@ -349,21 +378,21 @@ void uClockClass::handleTimerInt()
 		if (bpm != tempo) {
 			if (bpm >= MIN_BPM && bpm <= MAX_BPM) {
 				tempo = bpm;
-				setTimerTempo(tempo);
+				setTimerTempo(bpm);
 			}
 		}
 	}
 
 	if (onClock96PPQNCallback) {
-		onClock96PPQNCallback(&internal_tick);
+		onClock96PPQNCallback(internal_tick);
 	}
 
 	if (mod6_counter == 0) {
 		if (onClock32PPQNCallback) {
-			onClock32PPQNCallback(&div32th_counter);
+			onClock32PPQNCallback(div32th_counter);
 		}
 		if (onClock16PPQNCallback) {
-			onClock16PPQNCallback(&div16th_counter);
+			onClock16PPQNCallback(div16th_counter);
 		}
 		div16th_counter++;
 		div32th_counter++;
@@ -371,7 +400,7 @@ void uClockClass::handleTimerInt()
 
 	if (mod6_counter == 3) {
 		if (onClock32PPQNCallback) {
-			onClock32PPQNCallback(&div32th_counter);
+			onClock32PPQNCallback(div32th_counter);
 		}
 		div32th_counter++;
 	}
@@ -439,10 +468,10 @@ volatile uint32_t _timer = 0;
 // TIMER INTERRUPT HANDLER 
 // 
 //
-#if defined(TEENSYDUINO) && !defined(__AVR_ATmega32U4__)
+#if defined(ARDUINO_ARCH_AVR)
-void uclockISR() 
-#else
 ISR(TIMER1_COMPA_vect)
+#else
+void uclockISR() 
 #endif
 {
 	// global timer counter

src/uClock.h

@@ -1,10 +1,10 @@
 /*!
  *  @file       uClock.h
  *  Project     BPM clock generator for Arduino
- *  @brief      A Library to implement BPM clock tick calls using hardware timer interruption. Tested on ATmega168/328, ATmega16u4/32u4 and ATmega2560 and Teensy LC.
+ *  @brief      A Library to implement BPM clock tick calls using hardware timer interruption. Tested on ATmega168/328, ATmega16u4/32u4, ATmega2560, Teensy ARM boards and Seedstudio XIAO M0
- *  @version    1.0.0
+ *  @version    1.1.0
  *  @author     Romulo Silva
- *  @date       01/04/2022
+ *  @date       04/03/2022
  *  @license    MIT - (c) 2022 - Romulo Silva - contact@midilab.co
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -34,25 +34,25 @@
 
 namespace umodular { namespace clock {
 
-#define AVR_CLOCK_FREQ	16000000
-
-#define PHASE_FACTOR 16
-
-#define PLL_X 220
-
 // for smooth slave tempo calculate display you should raise this value 
 // in between 64 to 128.
 // note: this doesn't impact on sync time, only display time getTempo()
 // if you dont want to use it, set it to 1 for memory save
 #define EXT_INTERVAL_BUFFER_SIZE 24
 
+#define MIN_BPM	1
+#define MAX_BPM	300
+
+// want a different avr clock support?
+#define AVR_CLOCK_FREQ	16000000
+
+#define PHASE_FACTOR 16
+#define PLL_X 220
+
 #define SECS_PER_MIN  (60UL)
 #define SECS_PER_HOUR (3600UL)
 #define SECS_PER_DAY  (SECS_PER_HOUR * 24L)
 
-#define MIN_BPM	1
-#define MAX_BPM	300
-
 #define ATOMIC(X) noInterrupts(); X; interrupts();
 
 class uClockClass {
@@ -62,17 +62,17 @@ class uClockClass {
 		void setTimerTempo(float bpm);
 		float inline freqToBpm(uint32_t freq);
 
-		void (*onClock96PPQNCallback)(uint32_t * tick);
+		void (*onClock96PPQNCallback)(uint32_t tick);
-		void (*onClock32PPQNCallback)(uint32_t * tick);
+		void (*onClock32PPQNCallback)(uint32_t tick);
-		void (*onClock16PPQNCallback)(uint32_t * tick);
+		void (*onClock16PPQNCallback)(uint32_t tick);
 		void (*onClockStartCallback)();
 		void (*onClockStopCallback)();
 
 		// internal clock control
-		volatile uint32_t internal_tick;
+		uint32_t internal_tick;
-		volatile uint32_t div32th_counter;
+		uint32_t div32th_counter;
-		volatile uint32_t div16th_counter;
+		uint32_t div16th_counter;
-		volatile uint8_t mod6_counter;
+		uint8_t mod6_counter;
 
 		// external clock control
 		volatile uint32_t external_clock;
@@ -81,12 +81,9 @@ class uClockClass {
 		volatile uint32_t indiv16th_counter;
 		volatile uint8_t inmod6_counter;
 		volatile uint32_t interval;
-		volatile uint32_t last_interval;
+		uint32_t last_interval;
 		uint32_t sync_interval;
 
-		uint32_t tick_us_interval;
-		float tick_hertz_interval;
-
 		float tempo;
 		uint32_t start_timer;
 		uint8_t mode;
@@ -111,15 +108,15 @@ class uClockClass {
 		
 		uClockClass();
 
-		void setClock96PPQNOutput(void (*callback)(uint32_t * tick)) {
+		void setClock96PPQNOutput(void (*callback)(uint32_t tick)) {
 			onClock96PPQNCallback = callback;
 		}
 		
-		void setClock32PPQNOutput(void (*callback)(uint32_t * tick)) {
+		void setClock32PPQNOutput(void (*callback)(uint32_t tick)) {
 			onClock32PPQNCallback = callback;
 		}
 
-		void setClock16PPQNOutput(void (*callback)(uint32_t * tick)) {
+		void setClock16PPQNOutput(void (*callback)(uint32_t tick)) {
 			onClock16PPQNCallback = callback;
 		}