From b954f0a28bedb3ecd1f3f0a712501f2b27b7514a Mon Sep 17 00:00:00 2001
From: Oleksiy <sleepy@sleepy.kiev.ua>
Date: Wed, 3 May 2023 19:35:58 +0300
Subject: [PATCH] external beat clock partly works now

---
 software/GToE/GToE.ino | 53 ++++++++++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 15 deletions(-)

diff --git a/software/GToE/GToE.ino b/software/GToE/GToE.ino
index 0ab5d5a..65a8658 100644
--- a/software/GToE/GToE.ino
+++ b/software/GToE/GToE.ino
@@ -46,8 +46,6 @@ int outsClocksCounts[6];
 int playingModes[6]; //actual channel modes array updated from channels each beat
 
 int clockCount = 0;
-
-int pulseClockCount = 0;
 int pulseCount = 0;
 int pulsePeriod;
 bool isPlaying = 0;
@@ -55,8 +53,10 @@ int needToResetChannel;
 bool beatCounted = false;
 bool pulseCounted = false;
 
-int masterClockMode = 0; // 0 - internal, 1 - external 24ppqn
+unsigned int masterClockMode = 0; // 0 - internal, 1 - external 24ppqn, 2 - external beat
 bool externalPulseCounted = true;
+unsigned long lastExtPulseTime;
+unsigned long newExtPulseTime;
 
 int displayTab = 0;
 int displayTabOld;
@@ -122,7 +122,7 @@ void setup() {
   display.setTextColor(SSD1306_WHITE);
   display.println(F("V:0.1a"));   //Version
   display.display();
-  delay(2000);
+  delay(1200);
 
   updateScreen();
   updateTiming();
@@ -139,7 +139,7 @@ void clock() {
   if (isPlaying) {
 
     // Action on each pulse
-    if (pulseClockCount == 0 && !pulseCounted) {
+    if (clockCount == 0 && !pulseCounted) {
 
       //modulation 
       for (int i = 0; i<6; i++) {
@@ -193,7 +193,7 @@ void clock() {
 
     switch (masterClockMode) {
       case 0:  //internal
-        if (pulseClockCount == 0) {
+        if (clockCount == 0) {
           pulseCount++;
           beatCounted = false;
           pulseCounted = false;
@@ -207,18 +207,34 @@ void clock() {
           pulseCounted = false;
         }
         break;
+      case 2: //external beat
+        if (externalPulseCounted == false) {
+          externalPulseCounted = true;
+          clockCount == 0;
+          lastExtPulseTime = newExtPulseTime;
+          newExtPulseTime = millis();
+          if (lastExtPulseTime) {
+            updateTiming();
+          }
+        }
+        if (clockCount == 0) {
+          pulseCount++;
+          beatCounted = false;
+          pulseCounted = false;
+        } 
+        break;
     }
-    if (pulseClockCount < pulsePeriod) {  
-      pulseClockCount++;
+    if (clockCount < pulsePeriod) {  
+      clockCount++;
     } else {
-      pulseClockCount = 0;
+      clockCount = 0;
     }
     if (pulseCount >= PPQN) {
       pulseCount = 0;
     }
 
     // pull low all outputs after set pulse length
-    if (pulseClockCount >= PULSE_LENGTH) {
+    if (clockCount >= PULSE_LENGTH) {
       for (int i = 0; i<6; i++) { 
         digitalWrite(outsPins[i], LOW);
       }
@@ -231,7 +247,12 @@ void externalClock() {
 }
 
 void updateTiming() {
-  pulsePeriod = 60000 / (bpm * PPQN);
+  if (masterClockMode == 0) {
+    pulsePeriod = 60000 / (bpm * PPQN);
+  } else if (masterClockMode == 2) { //for external beat clock
+    pulsePeriod = (newExtPulseTime - lastExtPulseTime) / PPQN;
+    //Serial.println("pulsePeriod");
+  }
 }
 
 void resetClocks() {
@@ -278,8 +299,8 @@ void checkInputs() {
       updateScreen();
     }
     else if (encReleasedTime - encPressedTime < 2000 && displayTab == 0) { // switch to external clock mode
-      if (masterClockMode == 0) {
-        masterClockMode = 1;
+      if (masterClockMode < 2) {
+        masterClockMode++;
       } else {
         masterClockMode = 0;
       }
@@ -383,8 +404,10 @@ void updateScreen() {
   if (displayTab == 0 && masterClockMode == 0) {
     display.print(bpm);
     display.println(F("bpm")); 
-  } else if (displayTab == 0 && masterClockMode != 0) {
-    display.println(F("EXT")); 
+  } else if (displayTab == 0 && masterClockMode == 1) {
+    display.println(F("EXT-24")); 
+  } else if (displayTab == 0 && masterClockMode == 2) {
+    display.println(F("EXT-B")); 
   } else {
       if (clockModes[channels[displayTab-1].mode] == 0) {
         display.print(F("OFF"));