include/DisplayHandler.h

@@ -38,6 +38,7 @@ class DisplayHandler {
 		bool onOutScreen = false;
 		bool onMainScreen = true;
 		bool onSettingsScreen = false;
+		bool engageBPM = false;
 
 		std::array<std::string, 6> settings = {
 			"Save",

include/globals.h

@@ -18,6 +18,7 @@ static constexpr uint8_t OUT_6_PIN = 10;
 static constexpr uint8_t OUT_7_PIN = 12;
 static constexpr uint8_t OUT_8_PIN = 14;
 
+static constexpr uint8_t IN_CLK_PIN = 16;
 static constexpr uint8_t IN_RUN_PIN = 17;
 
 static constexpr uint8_t SCREEN_SCL_PIN = 18;
@@ -44,6 +45,9 @@ extern volatile bool RUN;
 extern volatile uint8_t EXTPPQNIdx;
 #define PPQN_OPTS_LEN 5
 extern const uint16_t PPQNOPTS[PPQN_OPTS_LEN];
+extern volatile uint64_t last_clk_us;
+extern volatile uint64_t last_valid_clk_us;
+extern volatile bool EXTERNAL_CLOCK;
 
 enum WaveShape { SQUARE, TRIANGLE, SAW, RAMP, EXP, HALFSINE, REXP, LOG, SINE, BOUNCE, SIGMO, WOBBLE, STEPDW, STEPUP, SH, SHAPE_COUNT};
 

src/DisplayHandler.cpp

@@ -258,23 +258,33 @@ void DisplayHandler::handleClickOnOutputScreen() {
 
 
 void DisplayHandler::handleClickOnMainScreen() {
-	if (cursorPosition > 0 && cursorPosition < 9) { // GO TO OUTPUT
+	if (cursorPosition == 0) {
+		if (engageBPM) {
+			cursorClick = 0;
+			engageBPM = false;
+		} else {
+			engageBPM = true;
+			cursorClick = 1;
+		}
+	} if (cursorPosition > 0 && cursorPosition < 9) { // GO TO OUTPUT
 		currentOut = cursorPosition - 1;
 		cursorPosition = 1;
 		currentScreen = 1;
 		onOutScreen = true;
 		onMainScreen = false;
-		onSettingsScreen = false;;
+		onSettingsScreen = false;
+		cursorClick = 0;
 	} else if (cursorPosition == 9) { // PLAY/PAUSE BUTTON
 		PLAY ^= true;
+		cursorClick = 0;
 	} else if (cursorPosition == 10) { // GLOBAL SETTINGS
 		cursorPosition = 0;
 		onSettingsScreen = true;
 		onMainScreen = false;
 		onOutScreen = false;
-	}
 		cursorClick = 0;
 	}
+}
 
 
 void DisplayHandler::handleClickOnSettingsScreen() {

src/Gate.cpp

@@ -293,6 +293,10 @@ void Gate::update() {
 
   if (elapsedUs >= pulseDurationUs) {
     state = 0;
+		if (width < 100) {
+			scheduledTick = 0xFFFFFFFF;
+			lastTriggerTick = 0xFFFFFFFF;
+		}
     if (!sticky)
       writeAnalog(0);
     return;

src/main.cpp

@@ -7,6 +7,8 @@
 #include <cstdio>
 #include <cstring>
 #include <hardware/gpio.h>
+#include <math.h>
+#include <pico/types.h>
 #include <stdio.h>
 
 #include "DisplayHandler.h"
@@ -26,6 +28,9 @@ volatile uint32_t MASTER_TICK;
 volatile bool RUN = false;
 const uint16_t PPQNOPTS[] = {1, 2, 4, 24, 48};
 volatile uint8_t EXTPPQNIdx = 0;
+volatile uint64_t last_clk_us = 0;
+volatile uint64_t last_valid_clk_us;
+volatile bool EXTERNAL_CLOCK = false;
 
 ModMatrix matrix;
 
@@ -75,6 +80,12 @@ void update_BPM(bool up) {
   for (auto g : outputs) {
     g->setWidth(g->width);
   }
+
+  if (!EXTERNAL_CLOCK) {
+    init_timer(period_us);
+  } else {
+    cancel_repeating_timer(&bpm_timer);
+  }
 }
 
 void core1_entry() {
@@ -130,6 +141,35 @@ void handle_outs() {
 }
 
 void gpio_callback(uint gpio, uint32_t events) {
+  // CLK LOGIC
+  if (gpio == IN_CLK_PIN && (events & GPIO_IRQ_EDGE_RISE)) {
+    uint64_t now = to_us_since_boot(get_absolute_time());
+
+    if (now - last_valid_clk_us < 5000) {
+      return;
+    }
+    last_valid_clk_us = now;
+
+    uint16_t incomingPPQN;
+    if (last_clk_us > 0) {
+      uint64_t diff = now - last_clk_us;
+      incomingPPQN = PPQNOPTS[EXTPPQNIdx];
+      float calculatedBPM = 60000000.0f / (float)(diff * incomingPPQN);
+
+      if (calculatedBPM >= 30 && calculatedBPM <= 255) {
+        if (fabsf((float)BPM - calculatedBPM) > 0.5f) {
+          BPM = (uint8_t)(calculatedBPM + 0.5f);
+
+          update_period();
+          for (auto g : outputs) {
+            g->setWidth(g->width);
+          }
+        }
+      }
+    }
+    MASTER_TICK += (PPQN / incomingPPQN);
+    last_clk_us = now;
+  }
 
   if (gpio == IN_RUN_PIN) {
     if (RUN) {
@@ -156,9 +196,16 @@ void setup_ins() {
   gpio_init(IN_RUN_PIN);
   gpio_set_dir(IN_RUN_PIN, GPIO_IN);
   gpio_pull_down(IN_RUN_PIN);
-	gpio_set_irq_enabled_with_callback(IN_RUN_PIN, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, true, &gpio_callback);
+  gpio_set_irq_enabled_with_callback(IN_RUN_PIN,
+                                     GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL,
+                                     true, &gpio_callback);
 
   // SETUP CLOCK
+  gpio_init(IN_CLK_PIN);
+  gpio_set_dir(IN_CLK_PIN, GPIO_IN);
+  gpio_pull_down(IN_CLK_PIN);
+  // Add to existing callback
+  gpio_set_irq_enabled(IN_CLK_PIN, GPIO_IRQ_EDGE_RISE, true);
 
   // SETUP CV INS
 }