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// Breadboard
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//int enable = 2;
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//int sTx = 4;
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//int sRx = 5;
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// RS485-Nano Revision 1.0
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int enable = 9;
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int sTx = 8;
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int sRx = 3;
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// Für Controllino könnte man benutzen: sRx = 20, sTx = 21, enable = 53
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int in1 = 4; // o
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int in2 = 5; // |o
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int in3 = 6; // ||o
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int in4 = 7; // |||o
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// ↓↓↓↓
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int irq = 2;// ←++++
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long base = 1000;
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int id = 0;
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int baud = 115200;
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char c;
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int counter = 0;
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bool reg1=false,reg2=false,reg3=false,reg4=false;
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void setup(){
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Serial.begin(baud);
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pinMode(A0,INPUT);
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id = analogRead(A0);
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pinMode(enable,OUTPUT);
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digitalWrite(enable,LOW);
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pinMode(sTx,OUTPUT);
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digitalWrite(sTx,LOW);
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pinMode(in1,INPUT);
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pinMode(in2,INPUT);
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pinMode(in3,INPUT);
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pinMode(in4,INPUT);
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pinMode(irq,INPUT);
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attachInterrupt(digitalPinToInterrupt(irq),interrupt,RISING);
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pinMode(sRx,INPUT);
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Serial.print("Baud rate set to ");
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Serial.println(baud);
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Serial.print("Initialized Arduino #");
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Serial.println(id);
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}
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void interrupt(){
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Serial.println("Interrupt");
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reg1 = digitalRead(in1);
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reg2 = digitalRead(in2);
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reg3 = digitalRead(in3);
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reg4 = digitalRead(in4);
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}
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bool sendBit(bool bt){
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digitalWrite(sTx,bt);
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delayMicroseconds(80);
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if (digitalRead(sTx) != bt) return false;
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delayMicroseconds(base-80);
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return true;
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}
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bool sendChar(char c){
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return sendBit(c & 0x01)
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&& sendBit(c & 0x02)
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&& sendBit(c & 0x04)
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&& sendBit(c & 0x08)
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&& sendBit(c & 0x10)
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&& sendBit(c & 0x20)
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&& sendBit(c & 0x40)
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&& sendBit(c & 0x80);
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}
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bool sendString(String s){
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Serial.print("Sending '"+s+"'…");
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boolean busy = false;
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for (int i = 0; i<11; i++){
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if (!digitalRead(sRx)) {
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if (!busy){
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Serial.print("busy…");
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busy = true;
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}
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i = 0; // wait for free line
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}
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delayMicroseconds(base);
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}
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digitalWrite(enable,HIGH);
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bool success = sendBit(0); // erste Flanke erzeugen
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if (success) {
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for (char c : s){
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if (!sendChar(c)){
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success = false;
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break;
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}
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}
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}
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success = success && sendChar(13);
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success = success && sendBit(1); // letzte Flanke erzeugen
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digitalWrite(enable,LOW);
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Serial.println(success ? "success" : "failed");
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return success;
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}
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void loop(){
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if (reg1){
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reg1 = false;
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sendString("t:02:01");
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}
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if (reg2){
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reg2 = false;
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sendString("t:02:02");
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}
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if (reg3){
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reg3 = false;
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sendString("t:02:03");
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}
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if (reg4){
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reg4 = false;
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sendString("t:02:04");
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}
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}
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