From b4aa6a13a1bcb072f60bfb8bffe56ab1f4996990 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 6 Jan 2025 22:33:31 +0100
Subject: [PATCH] Merge pull request #4450 from adafruit/main

Add correct pin availability for ESP32 Mini modules
---
 wled00/pin_manager.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/wled00/pin_manager.cpp b/wled00/pin_manager.cpp
index 86f0c88e..9ccdf1e0 100644
--- a/wled00/pin_manager.cpp
+++ b/wled00/pin_manager.cpp
@@ -755,7 +755,22 @@ bool PinManagerClass::isPinOk(byte gpio, bool output) const
     // JTAG: GPIO39-42 are usually used for inline debugging
     // GPIO46 is input only and pulled down
   #else
-    if (gpio > 5 && gpio < 12) return false;      //SPI flash pins
+    if ((gpio > 5 && gpio < 12) &&   // WLEDMM slightly faster to first check for "potentially reserved pins" and then call ESP.getChipModel()
+        ((strncmp_P(PSTR("ESP32-U4WDH"), ESP.getChipModel(), 11) == 0) ||    // this is the correct identifier, but....
+         (strncmp_P(PSTR("ESP32-PICO-D2"), ESP.getChipModel(), 13) == 0)))   // https://github.com/espressif/arduino-esp32/issues/10683
+    {
+      // this chip has 4 MB of internal Flash and different packaging, so available pins are different!
+      if (((gpio > 5) && (gpio < 9)) || (gpio == 11))
+        return false;
+    } else {
+      // for classic ESP32 (non-mini) modules, these are the SPI flash pins
+      if (gpio > 5 && gpio < 12) return false;      //SPI flash pins
+    }
+    //WLEDMM gpio 16/17 (PSRAM or SPI FLASH) are handled differently
+    // if (((strncmp_P(PSTR("ESP32-PICO"), ESP.getChipModel(), 10) == 0) ||
+    //     (strncmp_P(PSTR("ESP32-U4WDH"), ESP.getChipModel(), 11) == 0))
+    //    && (gpio == 16 || gpio == 17)) return false; // PICO-D4/U4WDH: gpio16+17 are in use for onboard SPI FLASH
+    // if (gpio == 16 || gpio == 17) return !psramFound(); //PSRAM pins on ESP32 (these are IO)
   #endif
     if (output) return digitalPinCanOutput(gpio);
     else        return true;