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96 lines
2.5 KiB
96 lines
2.5 KiB
12 months ago
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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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