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140 lines
2.0 KiB
C
140 lines
2.0 KiB
C
/*
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* rotaryEncoder.c
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*
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* Created: 16/12/2021 16:34:05
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* Author: n0x
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*/
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#include "rotaryEncoder.h"
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#define ROTA PORTC7 /* define Rotary Encoder Button A */
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#define ROTB PORTC6 /* define Rotary Encoder Button B */
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#define ROTBUTTON PORTC5
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/* enums */
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enum{
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LEFT1, LEFT2, LEFT3, RIGHT1, RIGHT2, RIGHT3,
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INIT, WAIT
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} RotaryState = INIT; /* Enum for the rotary enc */
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int16_t count;
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void
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drehgeber_init(void)
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{
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DDRC &= ~(7<<DDC5); /* Set bit 5-7 of Data Direction Register C as input */
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PORTC |= (7<<PORTC5); /* Initialize bit 5-7 of PORTC as for pull up resistor */
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/* With external interrupt */
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PCICR |= (1<<PCIE2);
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PCMSK2 |= (1<<PCINT23)|(1<<PCINT22);
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}
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ISR(PCINT2_vect)
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{
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drehgeber_process();
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}
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void
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drehgeber_process(void)
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{
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/* calculate the value of Button A and B of rotary encoder */
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uint8_t a, b, enc;
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a = ((PINC & (1<<ROTA)) == 0);
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b = ((PINC & (1<<ROTB)) == 0)<<1;
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enc = a+b;
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switch(RotaryState)
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{
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case INIT:
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RotaryState = WAIT;
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break;
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case WAIT:
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if(enc == 1)
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{
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RotaryState = LEFT1;
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}
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if(enc == 2)
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{
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RotaryState = RIGHT1;
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}
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break;
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case LEFT1:
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if(enc == 3)
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{
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RotaryState = LEFT2;
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}
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if(enc == 0)
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{
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RotaryState = WAIT;
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}
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break;
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case LEFT2:
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if(enc == 2)
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{
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RotaryState = LEFT3;
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}
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if(enc == 1)
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{
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RotaryState = LEFT1;
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}
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break;
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case LEFT3:
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if(enc == 0)
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{
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/* Increment counter and wait */
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count++;
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RotaryState = WAIT;
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}
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if(enc == 3)
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{
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RotaryState = LEFT2;
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}
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break;
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case RIGHT1:
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if(enc == 3)
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{
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RotaryState = RIGHT2;
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}
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if(enc == 0)
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{
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RotaryState = WAIT;
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}
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break;
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case RIGHT2:
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if(enc == 1)
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{
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RotaryState = RIGHT3;
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}
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if(enc == 2)
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{
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RotaryState = RIGHT1;
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}
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break;
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case RIGHT3:
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if(enc == 0)
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{
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/* Decrement counter and wait */
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count--;
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RotaryState = WAIT;
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}
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if(enc == 3)
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{
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RotaryState = RIGHT2;
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}
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break;
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}
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}
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int16_t drehgeber_get(void)
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{
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return count;
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} |