Add pin configuration according to default core defines

Author: giulcioffi

Diff for: src/RS485.cpp

@@ -186,4 +186,8 @@ void RS485Class::setDelays(int predelay, int postdelay)
   _postdelay = postdelay;
 }
 
+#ifdef RS285_SERIAL_PORT
+RS485Class RS485(RS285_SERIAL_PORT, RS485_DEFAULT_TX_PIN, RS485_DEFAULT_DE_PIN, RS485_DEFAULT_RE_PIN);
+#else
 RS485Class RS485(SERIAL_PORT_HARDWARE, RS485_DEFAULT_TX_PIN, RS485_DEFAULT_DE_PIN, RS485_DEFAULT_RE_PIN);
+#endif

Diff for: src/RS485.h

@@ -22,11 +22,13 @@
 
 #include <Arduino.h>
 
+#ifndef RS485_DEFAULT_TX_PIN
 #ifdef PIN_SERIAL1_TX
 #define RS485_DEFAULT_TX_PIN PIN_SERIAL1_TX
 #else
 #define RS485_DEFAULT_TX_PIN 1 
 #endif
+#endif
 
 #ifdef __AVR__
 #define RS485_DEFAULT_DE_PIN 2
@@ -35,9 +37,11 @@
 #define RS485_DEFAULT_DE_PIN A1
 #define RS485_DEFAULT_RE_PIN A0
 #else
+#ifndef RS485_DEFAULT_DE_PIN
 #define RS485_DEFAULT_DE_PIN A6
 #define RS485_DEFAULT_RE_PIN A5
 #endif
+#endif
 
 
 #define RS485_DEFAULT_PRE_DELAY 50