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arduinisten/projekte/lc-display/sketch_nov03a/sketch_nov03a.pde

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2010-03-30 18:55:18 +02:00
#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);
}