re,de pins bug fix

Author: mostafahk

src/RS485_defs.h

@@ -1,18 +1,24 @@
 #ifndef _ARDUINO_RS485_DEFS_H_INCLUDED
 #define _ARDUINO_RS485_DEFS_H_INCLUDED
 
+#ifndef RS485_DEFAULT_TX_PIN
 #ifdef PIN_SERIAL1_TX
 #define RS485_DEFAULT_TX_PIN PIN_SERIAL1_TX
 #else
-#define RS485_DEFAULT_TX_PIN 1 
+#define RS485_DEFAULT_TX_PIN 1
+#endif
 #endif
 
 #ifdef __AVR__
 #define RS485_DEFAULT_DE_PIN 2
 #define RS485_DEFAULT_RE_PIN -1
 #elif defined(ESP32) || defined(ESP8266)
+#ifndef RS485_DEFAULT_DE_PIN
 #define RS485_DEFAULT_DE_PIN 0
+#endif
+#ifndef RS485_DEFAULT_RE_PIN
 #define RS485_DEFAULT_RE_PIN 0
+#endif
 #else
 #define RS485_DEFAULT_DE_PIN A6
 #define RS485_DEFAULT_RE_PIN A5
@@ -26,7 +32,6 @@
 #define RS485_SER_CONF_TYPE uint16_t
 #endif
 
-
 #define RS485_DEFAULT_PRE_DELAY 50
 #define RS485_DEFAULT_POST_DELAY 50