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2 Commits
Author | SHA1 | Date |
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Stephan Richter | 84abe00224 | 4 weeks ago |
Stephan Richter | ae272b1ce9 | 4 weeks ago |
9 changed files with 194 additions and 43 deletions
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/* RS 485-Implementierung, die sowohl Schreiben als auch Lesen kann */ |
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/* Basis für andere Projekte */ |
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#define BUTTON 2 |
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#define RECEIVE 3 |
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#define RECEIVE_ENABLE 4 |
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#define SEND 5 |
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#define SEND_ENABLE 6 |
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#define MAX_LEN 128 |
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void setup() { |
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// Buttons connected to analog input lines
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pinMode(A0,INPUT_PULLUP); |
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pinMode(A1,INPUT_PULLUP); |
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pinMode(A2,INPUT_PULLUP); |
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pinMode(A3,INPUT_PULLUP); |
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pinMode(A4,INPUT_PULLUP); |
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pinMode(A5,INPUT_PULLUP); |
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pinMode(A6,INPUT_PULLUP); |
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pinMode(A7,INPUT_PULLUP); |
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// Currently, all buttons are also connected via a diode to an interruptable pin, to notify on input changes.
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// This interruptable pin should be assgined to BUTTON
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pinMode(BUTTON,INPUT_PULLUP); |
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attachInterrupt(digitalPinToInterrupt(BUTTON),button,FALLING); // interrupt for button change
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// Set up pins for RS485 connection
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pinMode(RECEIVE, INPUT); |
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pinMode(RECEIVE_ENABLE, OUTPUT); |
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pinMode(SEND, OUTPUT); |
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pinMode(SEND_ENABLE, OUTPUT); |
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attachInterrupt(digitalPinToInterrupt(RECEIVE),receive,CHANGE); // interrupt for incoming RS485 traffic
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reset485(); |
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buttons = 0x0; |
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} |
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void button() { |
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buttons = 0xFF ^ (digitalRead(A7)<<7 | digitalRead(A6)<<6 | digitalRead(A5)<<5 | digitalRead(A4)<<4 | digitalRead(A3)<<3 | (!digitalRead(A2))<<2 | digitalRead(A1)<<1 | digitalRead(A0));
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} |
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void receive(){ |
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bool received_bit = digitalRead(RECEIVE); |
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curr = micros(); |
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duration = curr - last; |
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Serial.print("Input switched to "); |
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Serial.print(received_bit?"H":"L");
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Serial.print(" after "); |
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Serial.print(duration); |
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Serial.println(" ticks"); |
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last = curr; |
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if (duration > MAX_TICKS) reset485(); |
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received_bit = !received_bit; // received_bit is the current value, the duration of the previous value (=inverted) has been measured
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duration /= BASE; |
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while (duration > 0){ |
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byte_idx--; |
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recv |= received_bit<<byte_idx; |
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if (byte_idx == 0) { |
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msg[msg_idx] = recv; |
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msg_idx++; |
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byte_idx = 8; |
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if (recv == 0x00) message_received(); |
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} |
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duration--; |
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} |
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} |
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void reset485(){ |
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byte_idx = 8; |
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msg_idx = 0; |
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recv=0x0; |
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} |
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void message_received(){ |
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for (int i=0; i<MAX_LEN; i++) message[i]=msg[i]; |
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reset485(); |
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} |
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void button_pressed(int i){ |
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Serial.println("not implemented"); |
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} |
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void loop(){ |
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if (buttons>0){ |
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for (int i=0; i<7; i++){ |
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if (buttons & (1<<i)) button_pressed(i);
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}
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} |
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if (message[0] != 0x0){ |
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Serial.print("Received '"); |
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Serial.print(message); |
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Serial.println("'");
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message[0] = 0x0; |
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} |
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} |
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@@ -0,0 +1,61 @@
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// Für Controllino könnte man benutzen: sRx = 20, sTx = 21, enable = 53
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int sTx = 2; |
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int sRx = 3; |
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long base = 100; |
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long rst = base*10; // reset
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boolean bt = false; |
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long dif = 0; |
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long lt = 0; |
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long now = 0; |
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char rcv = 0; |
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int idx = 0; |
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String message; |
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void setup(){ |
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pinMode(sRx,INPUT); |
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pinMode(sTx,OUTPUT); |
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attachInterrupt(digitalPinToInterrupt(sRx),change485,CHANGE); |
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Serial.begin(115200);
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Serial.println("Receiver ready"); |
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} |
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void reset485(long dif){ |
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rcv = 0; |
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idx = -1; |
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message.reserve(32); |
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} |
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void change485(){ |
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bool bt = digitalRead(sRx); |
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now = micros(); |
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dif = now - lt; |
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lt = now; |
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if (dif > rst){ |
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reset485(dif); |
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} else { |
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handle485(!bt,dif); |
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} |
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} |
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void handle485(boolean bt, long dif){ |
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long count = dif/base; |
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for (int i=0; i<count; i++) push485(bt); |
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} |
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void push485(boolean bt){ |
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if (idx>=0) rcv |= bt<<idx; |
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idx++; |
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if (idx == 8){ |
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if (rcv == 13) { |
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Serial.println(message); |
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message = ""; |
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} else { |
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message+=rcv; |
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}
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idx =0; |
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rcv =0; |
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} |
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} |
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void loop(){} |
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