move stuff

projekte/lc-display/sketch_nov03a/sketch_nov03a.pde

@@ -0,0 +1,65 @@
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+
+int pinA = 11;
+int pinB = 12;
+int ledPin = 13;
+
+void setup() {
+  //Timer2 Settings
+  TCCR2A = 0;
+  TCCR2B = 0<<CS22 | 1<<CS21 | 0<<CS20;
+
+  //Timer2 Overflow Interrupt Enable
+  TIMSK2 = 1<<TOIE2;
+
+  // pullups  
+  digitalWrite(pinA, HIGH); 
+  digitalWrite(pinB, HIGH); 
+  
+  Serial.begin(9600);
+}
+
+volatile int8_t enc_delta;			// -128 ... 127
+static int8_t last;
+
+
+ISR(TIMER2_OVF_vect) {
+  int8_t neu, diff;
+
+  // convert gray to binary 
+  neu = 0;
+  if(digitalRead(pinA))
+    neu = 3;
+  if(digitalRead(pinB))
+    neu ^= 1;
+    
+  diff = last - neu;				// difference last - new
+  if( diff & 1 ) {				// bit 0 = value (1)
+    last = neu;					// store new as next last
+    enc_delta += (diff & 2) - 1;		// bit 1 = direction (+/-)
+  }
+}
+
+int8_t val_alt;
+void loop() {
+  int8_t val;
+
+  digitalWrite(13,HIGH);
+
+  cli();
+  val = enc_delta;
+  // enc_delta = val & 1;
+  sei();
+  
+  if (val != val_alt) {
+    Serial.println(val>>1);
+  }
+  
+  val_alt = val;
+  
+  delay(100);
+  digitalWrite(13,LOW);
+  delay(100);
+}