Dateien geordnet

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>
2023-12-16 17:52:30 +01:00
parent 09a622ca50
commit 97a0e5b5b4
5 changed files with 0 additions and 0 deletions
--- a/Software/BiDi/BiDi.ino
+++ b/Software/BiDi/BiDi.ino
@@ -0,0 +1,95 @@
+/* RS 485-Implementierung, die sowohl Schreiben als auch Lesen kann */
+/* Basis für andere Projekte */
+
+#define BUTTON 2
+#define RECEIVE 3
+#define RECEIVE_ENABLE 4
+#define SEND 5
+#define SEND_ENABLE 6
+
+#define MAX_LEN 128
+
+void setup() {
+  // Buttons connected to analog input lines
+  pinMode(A0,INPUT_PULLUP);
+  pinMode(A1,INPUT_PULLUP);
+  pinMode(A2,INPUT_PULLUP);
+  pinMode(A3,INPUT_PULLUP);
+  pinMode(A4,INPUT_PULLUP);
+  pinMode(A5,INPUT_PULLUP);
+  pinMode(A6,INPUT_PULLUP);
+  pinMode(A7,INPUT_PULLUP);
+  // Currently, all buttons are also connected via a diode to an interruptable pin, to notify on input changes.
+  // This interruptable pin should be assgined to BUTTON
+  pinMode(BUTTON,INPUT_PULLUP);
+  attachInterrupt(digitalPinToInterrupt(BUTTON),button,FALLING); // interrupt for button change
+
+  // Set up pins for RS485 connection
+  pinMode(RECEIVE, INPUT);
+  pinMode(RECEIVE_ENABLE, OUTPUT);
+  pinMode(SEND, OUTPUT);
+  pinMode(SEND_ENABLE, OUTPUT);
+  attachInterrupt(digitalPinToInterrupt(RECEIVE),receive,CHANGE); // interrupt for incoming RS485 traffic
+  
+  reset485();
+  buttons = 0x0;
+}
+
+void button() {
+  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));  
+}
+
+void receive(){
+  bool received_bit = digitalRead(RECEIVE);
+  curr = micros();
+  duration = curr - last;
+  Serial.print("Input switched to ");
+  Serial.print(received_bit?"H":"L");  
+  Serial.print(" after ");
+  Serial.print(duration);
+  Serial.println(" ticks");
+  last = curr;
+  if (duration > MAX_TICKS) reset485();
+  received_bit = !received_bit; // received_bit is the current value, the duration of the previous value (=inverted) has been measured
+  duration /= BASE;
+  while (duration > 0){
+    byte_idx--;
+    recv |= received_bit<<byte_idx;
+    if (byte_idx == 0) {
+      msg[msg_idx] = recv;
+      msg_idx++;
+      byte_idx = 8;
+      if (recv == 0x00) message_received();
+    }
+    duration--;
+  }
+}
+
+void reset485(){
+  byte_idx = 8;
+  msg_idx = 0;
+  recv=0x0;
+}
+
+void message_received(){
+  for (int i=0; i<MAX_LEN; i++) message[i]=msg[i];
+  reset485();
+}
+
+void button_pressed(int i){
+  Serial.println("not implemented");
+}
+
+void loop(){
+  if (buttons>0){
+    for (int i=0; i<7; i++){
+      if (buttons & (1<<i)) button_pressed(i);     
+    }    
+  }
+  if (message[0] != 0x0){
+    Serial.print("Received '");
+    Serial.print(message);
+    Serial.println("'");    
+    message[0] = 0x0;
+  }
+}