From bd62cb991d424721e44cf107de5dbc9ca1a2ed19 Mon Sep 17 00:00:00 2001
From: Sebastian Nieto <sebanieto@gmail.com>
Date: Tue, 22 Sep 2026 00:19:57 -0300
Subject: [PATCH] fix(ui): inicializar spr.setTextFont(1) y
 spr.setFreeFont(NULL) para evitar excepcion LoadStoreError al renderizar
 fuente 1

---
 sketch/obd2_gauge/meter.h        | 17 ++++++++++++++---
 sketch/obd2_gauge/obd2_gauge.ino | 11 +++++++++++
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/sketch/obd2_gauge/meter.h b/sketch/obd2_gauge/meter.h
index 537a665..ceb039c 100644
--- a/sketch/obd2_gauge/meter.h
+++ b/sketch/obd2_gauge/meter.h
@@ -1363,13 +1363,18 @@ inline void renderPage1ToSprite(TFT_eSprite &s, int x_offset, int y_slice, int s
 // 100% Flicker-Free Double-Buffered Mobile Slide Transition
 // Safe 25KB sprite with pixel-perfect clipping and smooth ease-out pacing
 inline void animateSlideTransition(bool swipeLeft) {
+  Serial.println(">>> [DB] animateSlideTransition ENTER");
   const int slice_h = 40; // 320x40 = only 25KB (100% safe, leaves 70KB+ free for Bluetooth)
   const uint8_t numSlices = 240 / slice_h; // exactly 6 slices
 
   TFT_eSprite spr(&tft);
   if (spr.createSprite(320, slice_h) == nullptr) {
+    Serial.println(">>> [DB] spr.createSprite FAILED (nullptr)!");
     return; // Safety fallback
   }
+  spr.setTextFont(1);       // CRITICAL: initializes textfont=1 and clears uninitialized gfxFont=NULL
+  spr.setFreeFont(NULL);    // CRITICAL: prevents crash in textWidth() when drawing Font 1 on stack sprite
+  Serial.printf(">>> [DB] Sprite created OK. Heap: %u, MaxAlloc: %u\n", ESP.getFreeHeap(), ESP.getMaxAllocHeap());
 
   const uint8_t FRAMES = 28;
   // High-density sine ease-out deceleration over 28 frames:
@@ -1381,6 +1386,9 @@ inline void animateSlideTransition(bool swipeLeft) {
   };
 
   for (uint8_t f = 0; f < FRAMES; f++) {
+    if (f == 0 || f == FRAMES / 2 || f == FRAMES - 1) {
+      Serial.printf(">>> [DB] Frame %d / %d (heap: %u)\n", f, FRAMES, ESP.getFreeHeap());
+    }
     int16_t shift = step_shifts[f];
     int16_t splitX = swipeLeft ? (320 - shift) : shift;
     int16_t x0 = swipeLeft ? (-shift) : (shift - 320);
@@ -1422,15 +1430,14 @@ inline void animateSlideTransition(bool swipeLeft) {
   }
 
   spr.deleteSprite(); // Release the 25KB
+  Serial.printf(">>> [DB] animateSlideTransition LEAVE (heap: %u)\n", ESP.getFreeHeap());
 }
 
 /*-------------------*/
 // initialize display
 void initScreen() {
   terminalLineCount = 0;
-#ifdef SERIAL_DEBUG
-  Serial.printf("Display init, fullScreenCell = %d\n", fullScreenCell);
-#endif
+  Serial.printf(">>> [DB] initScreen START: page=%d, fullScreenCell=%d, heap=%u\n", currentScreenPage, fullScreenCell, ESP.getFreeHeap());
   for (int i = 0; i < 4; i++) {
     pidList[i] = pidConfig[pidInCell[i]][2];             // get PID to list
     pidReadSkip[i] = pidConfig[pidInCell[i]][6].toInt(); // get read skip
@@ -1444,10 +1451,13 @@ void initScreen() {
     old_data[i] = -999;
   }
   if (fullScreenCell >= 0 && fullScreenCell < 4) {
+    Serial.println(">>> [DB] initScreen: drawing fullScreenMeter");
     fullScreenMeter(fullScreenCell, pidInCell[fullScreenCell]);
   } else if (currentScreenPage == 1) {
+    Serial.println(">>> [DB] initScreen: drawing drawTriTempScreen(0)");
     drawTriTempScreen(0);
   } else {
+    Serial.println(">>> [DB] initScreen: drawing Page 0 quadrants");
     tft.fillScreen(TFT_BLACK); // clear screen
     for (uint8_t c = 0; c < 4; c++) {
       uint8_t pid = pidInCell[c];
@@ -1462,6 +1472,7 @@ void initScreen() {
     badgeEcoDrawn = false;
     updateEcoBadge(true);
   }
+  Serial.printf(">>> [DB] initScreen FINISHED OK (heap: %u)\n", ESP.getFreeHeap());
 }
 /*-------------------------------*/
 
diff --git a/sketch/obd2_gauge/obd2_gauge.ino b/sketch/obd2_gauge/obd2_gauge.ino
index 96466b1..7925fd7 100644
--- a/sketch/obd2_gauge/obd2_gauge.ino
+++ b/sketch/obd2_gauge/obd2_gauge.ino
@@ -651,19 +651,29 @@ void loop() {
           if (waitingForDoubleTap && (millis() - firstTapReleaseTime <= 400)) {
             // DOUBLE CLICK DETECTED: Switch Screen Page!
             waitingForDoubleTap = false;
+            Serial.println(">>> [DB] DOUBLE CLICK DETECTED!");
+            Serial.printf(">>> [DB] Free heap: %u, MaxAlloc: %u\n", ESP.getFreeHeap(), ESP.getMaxAllocHeap());
 
             if (fullScreenCell != -1) {
               fullScreenCell = -1;
             }
 
             if (currentScreenPage == 0) {
+              Serial.println(">>> [DB] Transitioning Page 0 -> 1");
               animateSlideTransition(true);
+              Serial.println(">>> [DB] Slide done. Setting currentScreenPage = 1");
               currentScreenPage = 1;
+              Serial.println(">>> [DB] Calling initScreen()...");
               initScreen();
+              Serial.println(">>> [DB] initScreen() completed.");
             } else {
+              Serial.println(">>> [DB] Transitioning Page 1 -> 0");
               animateSlideTransition(false);
+              Serial.println(">>> [DB] Slide done. Setting currentScreenPage = 0");
               currentScreenPage = 0;
+              Serial.println(">>> [DB] Calling initScreen()...");
               initScreen();
+              Serial.println(">>> [DB] initScreen() completed.");
             }
             waitForTouchRelease();
             lastActivityTime = millis();
@@ -673,6 +683,7 @@ void loop() {
             firstTapReleaseTime = millis();
             firstTapX = lastTouchX;
             firstTapY = lastTouchY;
+            Serial.printf(">>> [DB] First tap (X=%d, Y=%d), waiting for 2nd tap...\n", firstTapX, firstTapY);
           }
         }
       }