initial beta support for esp32...

examples/ESP32UsbMasterMidiClock/ESP32UsbMasterMidiClock.ino

@@ -0,0 +1,76 @@
+/* USB MIDI Sync Box
+ *  
+ * This example demonstrates how to change the USB MIDI 
+ * device name on ESP32 family. 
+ * 
+ * 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_USB);
+
+//MIDI_CREATE_INSTANCE(HardwareSerial, Serial1, MIDI);
+#include <uClock.h>
+
+// the blue led
+int LED_BUILTIN = 2;
+
+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
+    bpm_blink_timer = 1;
+    digitalWrite(LED_BUILTIN, HIGH);
+  } else if ( !(tick % bpm_blink_timer) ) { // get led off
+    digitalWrite(LED_BUILTIN, LOW);
+  }
+}
+
+// Internal clock handlers
+void ClockOut96PPQN(uint32_t tick) {
+  // Send MIDI_CLOCK to external gears
+  //MIDI_USB.sendRealTime(midi::Clock);
+  handle_bpm_led(tick);
+}
+
+void onClockStart() {
+  //MIDI_USB.sendRealTime(midi::Start);
+}
+
+void onClockStop() {
+  //MIDI_USB.sendRealTime(midi::Stop);
+}
+
+void setup() {
+  //MIDI_USB.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() {
+
+}

examples/ESP32UsbMasterMidiClock/debug.cfg

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Example OpenOCD configuration file for ESP32-WROVER-KIT board.
+#
+# For example, OpenOCD can be started for ESP32 debugging on
+#
+#   openocd -f board/esp32-wrover-kit-3.3v.cfg
+#
+
+# Source the JTAG interface configuration file
+source [find interface/ftdi/esp32_devkitj_v1.cfg]
+set ESP32_FLASH_VOLTAGE 3.3
+# Source the ESP32 configuration file
+source [find target/esp32.cfg]

examples/ESP32UsbMasterMidiClock/debug_custom.json

@@ -0,0 +1,19 @@
+{
+	"name":"Arduino on ESP32",
+	"toolchainPrefix":"xtensa-esp32-elf",
+	"svdFile":"esp32.svd",
+	"request":"attach",
+	"postAttachCommands":[
+		"set remote hardware-watchpoint-limit 2",
+		"monitor reset halt",
+		"monitor gdb_sync",
+		"thb setup",
+		"c"
+	],
+	"overrideRestartCommands":[
+		"monitor reset halt",
+		"monitor gdb_sync",
+		"thb setup",
+		"c"
+	]
+}

library.properties

@@ -1,10 +1,10 @@
 name=uClock
-version=1.1.4
+version=1.2.0
 author=Romulo Silva <contact@midilab.co>
 maintainer=Romulo Silva <contact@midilab.co>
 sentence=BPM clock generator for Arduino platform.
-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 and Seedstudio XIAO M0)
+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 and ESP32)
 category=Timing
 url=https://github.com/midilab/uClock
-architectures=avr,arm,samd
+architectures=avr,arm,samd,esp32
 includes=uClock.h

src/uClock.cpp

@@ -1,8 +1,8 @@
 /*!
  *  @file       uClock.cpp
  *  Project     BPM clock generator for Arduino
- *  @brief      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 and Seedstudio XIAO M0)
- *  @version    1.1.4
+ *  @brief      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 and ESP32)
+ *  @version    1.2.0
  *  @author     Romulo Silva
  *  @date       10/06/2017
  *  @license    MIT - (c) 2022 - Romulo Silva - contact@midilab.co
@@ -44,6 +44,10 @@ IntervalTimer _uclockTimer;
 //#include <TimerTC3.h>
 // uses TimerTc3
 #endif
+// ESP32 family
+#if defined(ARDUINO_ARCH_ESP32) || defined(ESP32)
+hw_timer_t * _uclockTimer = NULL;
+#endif
 
 #if defined(ARDUINO_ARCH_AVR)
 void uclockInitTimer()
@@ -87,6 +91,19 @@ void uclockInitTimer()
 		// attach to generic uclock ISR
 		TimerTcc0.attachInterrupt(uclockISR);
 	#endif
+
+	#if defined(ARDUINO_ARCH_ESP32) || defined(ESP32)
+		_uclockTimer = timerBegin(0, 80, true);
+
+		// attach to generic uclock ISR
+		timerAttachInterrupt(_uclockTimer, &uclockISR, true);
+
+		// init clock tick time
+		timerAlarmWrite(_uclockTimer, init_clock, true); 
+
+		// activate it!
+		timerAlarmEnable(_uclockTimer);
+	#endif
 }
 #endif
 
@@ -213,6 +230,10 @@ void uClockClass::setTimerTempo(float bpm)
 	#if defined(SEEED_XIAO_M0)
 		TimerTcc0.setPeriod(tick_us_interval);
 	#endif
+
+	#if defined(ARDUINO_ARCH_ESP32) || defined(ESP32)
+		timerAlarmWrite(_uclockTimer, tick_us_interval, true); 
+	#endif
 #endif
 }
 

src/uClock.h

@@ -1,8 +1,8 @@
 /*!
  *  @file       uClock.h
  *  Project     BPM clock generator for Arduino
- *  @brief      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 and Seedstudio XIAO M0)
- *  @version    1.1.4
+ *  @brief      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 and ESP32)
+ *  @version    1.2.0
  *  @author     Romulo Silva
  *  @date       10/06/2017
  *  @license    MIT - (c) 2022 - Romulo Silva - contact@midilab.co
@@ -44,6 +44,7 @@ namespace umodular { namespace clock {
 #define MAX_BPM	300
 
 // want a different avr clock support?
+// TODO: we should do this using macro guards for avrs different clocks
 #define AVR_CLOCK_FREQ	16000000
 
 #define PHASE_FACTOR 16