started development of Rs485 lib

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

SoftRS485.cpp

@@ -0,0 +1,35 @@
+/*
+    Library for Software Serial over RS485 connection
+    Created by Stepan Richter, November 2023
+*/
+
+#include "Arduino.h"
+#include "SoftRS485.h"
+
+SoftRS485 SoftRS485::instance;
+
+SoftRS485 SoftRS485::singleton(){
+    return instance;
+}
+
+void SoftRS485::isr(){
+    instance.bam();
+}
+
+void SoftRS485::begin(int RO, int nRE, int DE, int DI){
+  _RO = RO;
+  _RE = nRE;
+  _DE = DE;
+  _DI = DI;
+  Serial.begin(115200);
+  pinMode(_RE, OUTPUT);
+  pinMode(_DE, OUTPUT);
+  pinMode(_DI, OUTPUT);
+  pinMode(_RO, INPUT);
+  attachInterrupt(digitalPinToInterrupt(_RO),isr,CHANGE);
+  Serial.println("attached to interrupt!");
+}
+
+void SoftRS485::bam(){
+    Serial.println("bam!");
+}

SoftRS485.h

@@ -0,0 +1,22 @@
+/*
+    Library for Software Serial over RS485 connection
+    Created by Stepan Richter, November 2023
+*/
+
+#ifndef SoftRS485_h
+#define SoftRS485_h
+
+#include "Arduino.h"
+
+class SoftRS485{
+  public:
+    void begin(int RO, int nRE, int DE, int DI);
+    void bam();
+    static SoftRS485 singleton();
+  private:
+    static void isr();
+    static SoftRS485 instance;
+    int _RO, _RE, _DE, _DI;
+};
+
+#endif