Merge pull request arduino-libraries#36 from manchoz/opta_rx_rs485

Manage RS485_RX pull-up for Opta

Author: manchoz

.github/workflows/compile-examples.yml

@@ -61,6 +61,9 @@ jobs:
           - fqbn: arduino:mbed_portenta:envie_m7
             platforms: |
               - name: arduino:mbed_portenta
+          - fqbn: arduino:mbed_opta:opta
+            platforms: |
+              - name: arduino:mbed_opta
 
     steps:
       - name: Checkout repository

library.properties

@@ -6,5 +6,5 @@ sentence=Enables sending and receiving data using the RS-485 standard with RS-48
 paragraph=This library supports the Maxim Integrated MAX3157 and equivalent chipsets.
 category=Communication
 url=http://www.arduino.cc/en/Reference/ArduinoRS485
-architectures=samd,mbed_portenta
+architectures=samd,mbed_portenta,mbed_opta
 includes=ArduinoRS485.h

src/RS485.cpp

@@ -76,7 +76,12 @@ void RS485Class::begin(unsigned long baudrate, uint16_t config, int predelay, in
 
   _transmisionBegun = false;
 
+#if defined(ARDUINO_OPTA)
+  auto _opta_uart = static_cast<UART *>(_serial);
+  _opta_uart->begin(baudrate, config, true);
+#else
   _serial->begin(baudrate, config);
+#endif 
 }
 
 void RS485Class::end()