add esp8266 comments and specfic code

examples/BasicUsage/BasicUsage.ino

@@ -8,7 +8,8 @@
 
 void setup() {
   Serial.begin(115200);
-  while(!Serial) delay(10); 
+  while (!Serial)
+    delay(10);
   // wait for Arduino Serial Monitor (native USB boards)
 
   Serial.println("Adafruit Watchdog Library Demo!");
@@ -29,8 +30,9 @@ void setup() {
 
   // Now loop a few times and periodically reset the watchdog.
   Serial.println("Looping ten times while resetting the watchdog...");
-  for(int i = 1; i <= 10; ++i) {
-    Serial.print("Loop #"); Serial.println(i, DEC);
+  for (int i = 1; i <= 10; ++i) {
+    Serial.print("Loop #");
+    Serial.println(i, DEC);
     delay(1000);
     // Reset watchdog with every loop to make sure the sketch keeps running.
     // If you comment out this call watch what happens in about 4 iterations!
@@ -41,7 +43,7 @@ void setup() {
 #ifndef NRF52_SERIES // cannot disable nRF's WDT
   // Disable the watchdog entirely by calling Watchdog.disable();
   Watchdog.disable();
-#endif  
+#endif
 
   // Finally demonstrate the watchdog resetting by enabling it for a shorter
   // period of time and waiting a long time without a reset.  Notice you can
@@ -54,7 +56,13 @@ void setup() {
   Serial.print(countdownMS, DEC);
   Serial.println(" milliseconds!");
   Serial.println();
-  delay(countdownMS+1000);
+#ifndef ARDUINO_ARCH_ESP8266
+  delay(countdownMS + 1000);
+#else
+  // Calls to delay() and yield() feed the ESP8266's
+  // hardware and software watchdog timers, delayMicroseconds does not.
+  delayMicroseconds(countdownMS * 1000);
+#endif
 
   // Execution will never get here because the watchdog resets the Arduino!
 }

utility/WatchdogESP8266.cpp

@@ -17,7 +17,6 @@
 */
 /**********************************************************************************************/
 int WatchdogESP8266::enable(int maxPeriodMS) {
-  ESP.wdtDisable();
   if (maxPeriodMS < 0)
     return 0;
 
@@ -30,17 +29,19 @@ int WatchdogESP8266::enable(int maxPeriodMS) {
 
 /**************************************************************************/
 /*!
-    @brief  Feeds the Watchdog Timer.
+    @brief  Feeds the Watchdog timer.
+    NOTE: Calling yield() or delay() also feeds the hardware and software
+    watchdog timers.
 */
 /**************************************************************************/
 void WatchdogESP8266::reset() { ESP.wdtFeed(); }
 
 /**************************************************************************/
 /*!
     @brief  Disables the Watchdog Timer.
-        NOTE: Please don't stop software watchdog too long
-        (less than 6 seconds), otherwise it will trigger the hardware
-        watchdog reset.
+        NOTE: Please don't stop the software WDT too long
+        (less than 6 seconds), otherwise it will trigger a hardware
+        watchdog reset!
 */
 /**************************************************************************/
 void WatchdogESP8266::disable() { ESP.wdtDisable(); }