added RS485 support (#6)

added RS485 support

renaming and changes for RS485 library to support mbed

Author: Rocketct

examples/RS485_fullduplex/RS485_fullduplex.ino

@@ -0,0 +1,66 @@
+/*
+  RS485 Full duplex communication
+
+  This sketch shows how to use the SP335ECR1 on the Automation
+  Carrier as a full duplex RS485 interface, how to periodically
+  send a string on the RS485 TX channel and how to receive data
+  from the interface RX channel.
+
+  Circuit:
+   - Portenta H7
+   - Automation Carrier
+   - A Slave device with RS485 inteface
+
+
+  created 25 August 2020
+  by Silvio Navaretti
+  modified 24 September 2020
+  by Martino Facchin, Riccardo Rizzo
+*/
+
+#include "AutomationCarrier.h"
+
+using namespace automation;
+
+unsigned long counter = 0;
+
+void setup() {
+
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect.
+  }
+  Serial.println("Start RS485 initialization");
+
+  // Initialize the serial interface, enable the 
+  // RS485 on SP335ECR1 and set as full duplex 
+  comm_protocols.rs485.begin(9600);
+  comm_protocols.rs485.enable = 1;
+  comm_protocols.rs485.sel_485 = 1;
+  comm_protocols.rs485.half_duplex = 0;
+
+  Serial.println("Initialization done!");
+}
+
+
+void loop() {
+  // Call receive(); sets the flux control pins properly
+  // and allows receiving data if available
+  comm_protocols.rs485.receive();
+  if (comm_protocols.rs485.available()) {
+    Serial.print("read byte: ");
+    Serial.write(comm_protocols.rs485.read());
+    Serial.println();
+  }
+  // Call beginTransmission(); sets the flux control pins properly
+  // and allows starting a trasnsmission.
+  // If instead of a string, you want
+  // to send bytes, use the API write();
+  comm_protocols.rs485.beginTransmission();
+  comm_protocols.rs485.print("hello ");
+  comm_protocols.rs485.println(counter);
+  comm_protocols.rs485.endTransmission();
+  counter++;
+
+  delay(1000);
+}

src/AutomationCarrier.h

@@ -3,7 +3,7 @@
 
 #include "utility/Adafruit_MAX31865/Adafruit_MAX31865.h"
 #include "utility/Arduino_MKRTHERM/src/MKRTHERM.h"
-#include "utility/ArduinoRS485/src/ArduinoRS485.h"
+#include "utility/RS485/RS485.h"
 #include "utility/QEI/QEI.h"
 #include "utility/ioexpander/TCA6424A.h"
 

src/utility/ArduinoRS485/README.adoc

@@ -1,6 +1,6 @@
 /*
   This file is part of the ArduinoRS485 library.
-  Copyright (c) 2018 Arduino SA. All rights reserved.
+  Copyright (c) 2020 Arduino SA.
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
@@ -61,7 +61,7 @@ void RS485Class::end()
     digitalWrite(_rePin, LOW);
     pinMode(_dePin, INPUT);
   }
-  
+
   if (_dePin != NC) {
     digitalWrite(_dePin, LOW);
     pinMode(_rePin, INPUT);

src/utility/ArduinoRS485/examples/RS485Passthrough/RS485Passthrough.ino

@@ -1,6 +1,6 @@
 /*
   This file is part of the ArduinoRS485 library.
-  Copyright (c) 2018 Arduino SA. All rights reserved.
+  Copyright (c) 2020 Arduino SA.
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
@@ -20,24 +20,9 @@
 #ifndef _RS485_H_INCLUDED
 #define _RS485_H_INCLUDED
 
-#include <Arduino.h>
-
+#include "Arduino.h"
 #include "mbed.h"
 
-#ifdef PIN_SERIAL1_TX
-#define RS485_DEFAULT_TX_PIN PIN_SERIAL1_TX
-#else
-#define RS485_DEFAULT_TX_PIN 1 
-#endif
-
-#ifdef __AVR__
-#define RS485_DEFAULT_DE_PIN 2
-#define RS485_DEFAULT_RE_PIN -1
-#else
-#define RS485_DEFAULT_DE_PIN A6
-#define RS485_DEFAULT_RE_PIN A5
-#endif
-
 class RS485Class : public Stream {
   public:
     RS485Class(HardwareSerial& hwSerial, PinName txPin = NC, PinName dePin = NC, PinName rePin = NC);