Added Pin Manager

wled00/pin_manager.cpp

@@ -0,0 +1,54 @@
+#include "wled.h"
+
+/*
+ * Registers pins so there is no attempt for two interfaces to use the same pin
+ */
+
+void PinManagerClass::deallocatePin(byte gpio)
+{
+  if (!isPinOk(gpio, false)) return;
+  
+  byte by = gpio >> 3;
+  byte bi = gpio - 8*by;
+  bitWrite(pinAlloc[by], bi, false);
+}
+
+bool PinManagerClass::allocatePin(byte gpio, bool output)
+{
+  if (!isPinOk(gpio, output)) return false;
+  if (isPinAllocated(gpio)) {
+    DEBUG_PRINT(F("Attempted duplicate allocation of pin "));
+    DEBUG_PRINTLN(gpio);
+    return false;
+  }
+
+  byte by = gpio >> 3;
+  byte bi = gpio - 8*by;
+  bitWrite(pinAlloc[by], bi, true);
+  
+  return true;
+}
+
+bool PinManagerClass::isPinAllocated(byte gpio)
+{
+  if (!isPinOk(gpio, false)) return true;
+  
+  byte by = gpio >> 3;
+  byte bi = gpio - 8*by;
+  return bitRead(pinAlloc[by], bi);
+}
+
+bool PinManagerClass::isPinOk(byte gpio, bool output)
+{
+  if (gpio <  6) return  true;
+  if (gpio < 12) return false; //SPI flash pins
+  
+  #ifdef ESP8266
+  if (gpio < 17) return true;
+  #else //ESP32
+  if (gpio < 34) return true;
+  if (gpio < 40 && !output) return true; //34-39 input only
+  #endif
+  
+  return false;
+}