ESP8266 fast GPIO functions

SdFat/src/FatLib/FatFileSystem.h

@@ -84,6 +84,15 @@ class FatFileSystem : public  FatVolume {
     tmpFile.open(vwd(), path, mode);
     return tmpFile;
   }
+  /** open a file
+   *
+   * \param[in] path location of file to be opened.
+   * \param[in] mode open mode flags.
+   * \return a File object.
+   */
+  File open(const String &path, uint8_t mode = FILE_READ) {
+    return open(path.c_str(), mode ); 
+  }
 #endif  // ENABLE_ARDUINO_FEATURES
   /** Change a volume's working directory to root
    *

SdFat/src/SdSpiCard/DigitalPin.h

@@ -225,6 +225,36 @@ void fastDigitalWrite(uint8_t pin, bool value) {
     g_APinDescription[pin].pPort->PIO_CODR = g_APinDescription[pin].ulPin;
   }
 }
+#elif defined(ESP8266)
+//------------------------------------------------------------------------------
+/** Set pin value
+ * @param[in] pin Arduino pin number
+ * @param[in] level value to write
+ */
+static inline __attribute__((always_inline))
+void fastDigitalWrite(uint8_t pin, uint8_t val) {
+  if(pin < 16){
+    if(val) GPOS = (1 << pin);
+    else GPOC = (1 << pin);
+  } else if(pin == 16){
+    if(val) GP16O |= 1;
+    else GP16O &= ~1;
+  }
+}
+//------------------------------------------------------------------------------
+/** read pin value
+ * @param[in] pin Arduino pin number
+ * @return value read
+ */
+static inline __attribute__((always_inline))
+bool fastDigitalRead(uint8_t pin) {
+  if(pin < 16){
+    return GPIP(pin);
+  } else if(pin == 16){
+    return GP16I & 0x01;
+  }
+  return 0;
+}
 #else  // CORE_TEENSY
 //------------------------------------------------------------------------------
 inline void fastDigitalWrite(uint8_t pin, bool value) {