From 81b189186d63c4918ae5d44344cfeda23218b4c0 Mon Sep 17 00:00:00 2001
From: midilab <contact@midilab.co>
Date: Fri, 1 Dec 2017 13:35:44 -0200
Subject: [PATCH] Added external clock support. Based on MIDI standard clock
 pulse. Use it via clockMe() on each received clock midi message

---
 src/uClock.cpp | 152 ++++++++++++++++++++++++++-----------------------
 src/uClock.h   |   6 +-
 2 files changed, 83 insertions(+), 75 deletions(-)

diff --git a/src/uClock.cpp b/src/uClock.cpp
index c895e5c..2773f9f 100755
--- a/src/uClock.cpp
+++ b/src/uClock.cpp
@@ -79,67 +79,6 @@ uint16_t clock_diff(uint16_t old_clock, uint16_t new_clock)
 	}
 }
 
-void uClockClass::handleClock() 
-{
-	uint16_t cur_clock = _clock;
-	uint16_t diff;
-
-	if (cur_clock > last_clock) {
-		diff = cur_clock - last_clock;
-	} else {
-		diff = cur_clock + (65535 - last_clock);
-	}
-	
-	last_interval = diff;
-	last_clock = cur_clock;
-	indiv96th_counter++;
-	inmod6_counter++;
-
-	if (inmod6_counter == 6) {
-		inmod6_counter = 0;
-	}
-
-	switch (state) {
-
-		case PAUSED:
-			break;
-
-		case STARTING:
-			state = STARTED;
-			break;
-
-		case STARTED:
-			if (indiv96th_counter == 2) {
-				interval = diff;
-			} else {
-				interval = (((uint32_t)interval * (uint32_t)pll_x) + (uint32_t)(256 - pll_x) * (uint32_t)diff) >> 8;
-			}
-			break;
-
-	}
-
-}
-
-void uClockClass::handleStart() 
-{
-	if (mode == EXTERNAL_CLOCK) {
-		init();
-		state = STARTING;
-		mod6_counter = 0;
-		div96th_counter = 0;
-		div32th_counter = 0;
-		div16th_counter = 0;
-		counter = 0;
-	}
-}
-
-void uClockClass::handleStop() 
-{
-	if (mode == EXTERNAL_CLOCK) {
-		state = PAUSED;
-	}
-}
-
 #define PHASE_FACTOR 16
 static uint32_t phase_mult(uint32_t val) 
 {
@@ -154,35 +93,53 @@ void uClockClass::start()
 		div96th_counter = 0;
 		div32th_counter = 0;
 		div16th_counter = 0;
-		if (onClockStartCallback) {
-			onClockStartCallback();
-		}
-	}
+	} else {
+	//if (mode == EXTERNAL_CLOCK) {
+		init();
+		state = STARTING;
+		mod6_counter = 0;
+		div96th_counter = 0;
+		div32th_counter = 0;
+		div16th_counter = 0;
+		counter = 0;
+	}	
+	
+	if (onClockStartCallback) {
+		onClockStartCallback();
+	}	
 }
 
 void uClockClass::stop()
 {
 	if (mode == INTERNAL_CLOCK) {
 		state = PAUSED;
-		if (onClockStopCallback) {
-			onClockStopCallback();
-		}
-	}
+	} else {
+	//if (mode == EXTERNAL_CLOCK) {
+		state = PAUSED;
+	}	
+	
+	if (onClockStopCallback) {
+		onClockStopCallback();
+	}	
 }
 
 void uClockClass::pause() 
 {
-	if (mode == INTERNAL_CLOCK) {
+	//if (mode == INTERNAL_CLOCK) {
 		if (state == PAUSED) {
 			start();
 		} else {
 			stop();
 		}
-	}
+	//}
 }
 
 void uClockClass::setTempo(uint16_t _tempo) 
 {
+	if (mode == EXTERNAL_CLOCK) {
+		return;
+	}
+	
 	if ( tempo == _tempo ) {
 		return;
 	}
@@ -198,6 +155,11 @@ uint16_t uClockClass::getTempo()
 	return tempo;
 }
 
+void uClockClass::setMode(uint8_t tempo_mode) 
+{
+	mode = tempo_mode;
+}
+
 void uClockClass::clockMe() 
 {
 	if (uClock.mode == uClock.EXTERNAL_CLOCK) {
@@ -217,6 +179,54 @@ void uClockClass::shuffle()
 	// shuffle me
 }
 
+void uClockClass::handleClock() 
+{
+	uint16_t cur_clock = _clock;
+	uint16_t diff;
+
+	if (cur_clock > last_clock) {
+		diff = cur_clock - last_clock;
+	} else {
+		diff = cur_clock + (65535 - last_clock);
+	}
+	
+	last_interval = diff;
+	last_clock = cur_clock;
+	indiv96th_counter++;
+	inmod6_counter++;
+
+	if (inmod6_counter == 6) {
+		inmod6_counter = 0;
+	}
+
+	switch (state) {
+
+		case PAUSED:
+			break;
+
+		case STARTING:
+			state = STARTED;
+			break;
+
+		case STARTED:
+			if (indiv96th_counter == 2) {
+				interval = diff;
+			} else {
+				interval = (((uint32_t)interval * (uint32_t)pll_x) + (uint32_t)(256 - pll_x) * (uint32_t)diff) >> 8;
+			}
+			break;
+
+/*
+			interval = (uint32_t)((uint32_t)156250 / tempo) - 16;
+			
+			interval = x(156250 / tempo) - 16;
+			x(156250 / tempo) = -16
+*/
+
+	}
+
+}
+
 void uClockClass::handleTimerInt()  
 {
 	if (counter == 0) {
diff --git a/src/uClock.h b/src/uClock.h
index 1a8a32c..220f78f 100755
--- a/src/uClock.h
+++ b/src/uClock.h
@@ -65,8 +65,7 @@ class uClockClass {
 		} state;
 
 		enum {
-			OFF = 0,
-			INTERNAL_CLOCK,
+			INTERNAL_CLOCK = 0,
 			EXTERNAL_CLOCK
 		} mode;
 
@@ -94,8 +93,6 @@ class uClockClass {
 
 		void init();
 		void handleClock();
-		void handleStart();
-		void handleStop();
 		void handleTimerInt();
 		
 		// external class control
@@ -106,6 +103,7 @@ class uClockClass {
 		uint16_t getTempo();
 
 		// External timming control
+		void setMode(uint8_t tempo_mode);
 		void clockMe();
 		
 		void shuffle();