Try to fix scale-adjust-firmware regarding ESP8266 compatibility again

Author: amotl

CHANGES.rst

@@ -9,6 +9,8 @@ CHANGES
 
 in-progress
 ===========
+- Try to fix :ref:`scale-adjust-firmware` regarding ESP8266 compatibility again
+
 
 .. _version-0.15.0:
 

scale-adjust/ADS1231/scale-adjust-ads1231.ino

@@ -290,9 +290,9 @@ void outputStatistic(int decimal) {
 // Poll serial port until anything is received
 void serial_poll() {
   while (!Serial.available()) {
-    #if ARDUINO_VERSION > 106
     // "yield" is not implemented as noop in older Arduino Core releases
     // See also: https://stackoverflow.com/questions/34497758/what-is-the-secret-of-the-arduino-yieldfunction/34498165#34498165
+    #if !(ARDUINO_VERSION <= 106) || ARDUINO >= 10605 || defined(ESP8266)
     yield();
     #endif
   };

scale-adjust/HX711/scale-adjust-hx711.ino

@@ -278,9 +278,9 @@ void outputStatistic(int decimal) {
 // Poll serial port until anything is received
 void serial_poll() {
   while (!Serial.available()) {
-    #if ARDUINO_VERSION > 106
     // "yield" is not implemented as noop in older Arduino Core releases
     // See also: https://stackoverflow.com/questions/34497758/what-is-the-secret-of-the-arduino-yieldfunction/34498165#34498165
+    #if !(ARDUINO_VERSION <= 106) || ARDUINO >= 10605 || defined(ESP8266)
     yield();
     #endif
   };