?? rotary_switch.c
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#include <avr/io.h>#include "config.h"volatile static uint8_t bounce_delay=0;static uint8_t old_state1, old_state2;static uint8_t ROT_TABLE[] = { 0, 3, 1, 2 };static uint8_t read_state1() { return (ROTARY_PIN & _BV(ROTARY1A_BIT) ? 1 : 0) | (ROTARY_PIN & _BV(ROTARY1B_BIT) ? 2 : 0);}static uint8_t read_state2() { return (ROTARY_PIN & _BV(ROTARY2A_BIT) ? 1 : 0) | (ROTARY_PIN & _BV(ROTARY2B_BIT) ? 2 : 0);}static int8_t get_rotary_delta(uint8_t old, uint8_t new) { int8_t rot = ROT_TABLE[new & 3] - ROT_TABLE[old & 3]; if(rot == 3) rot = -1; if(rot == -3) rot = 1; return rot;}void init_rotary() { ROTARY_DDR &= ~_BV(ROTARY1A_BIT); ROTARY_DDR &= ~_BV(ROTARY1B_BIT); ROTARY_DDR &= ~_BV(ROTARY2A_BIT); ROTARY_DDR &= ~_BV(ROTARY2B_BIT); ROTARY_PORT |= _BV(ROTARY1A_BIT); ROTARY_PORT |= _BV(ROTARY1B_BIT); ROTARY_PORT |= _BV(ROTARY2A_BIT); ROTARY_PORT |= _BV(ROTARY2B_BIT); old_state1 = read_state1(); old_state2 = read_state2();}void rotary_bounce_tick() { if(bounce_delay) bounce_delay--;}void get_rotary(int8_t *rotary1, int8_t *rotary2) { *rotary1 = *rotary2 = 0; if(!bounce_delay) { uint8_t new_state1 = read_state1(); if(new_state1 != old_state1) { *rotary1 = get_rotary_delta(old_state1, new_state1); old_state1 = new_state1; bounce_delay = 20; } uint8_t new_state2 = read_state2(); if(new_state2 != old_state2) { *rotary2 = get_rotary_delta(old_state2, new_state2); old_state2 = new_state2; bounce_delay = 20; } }}?? 快捷鍵說明
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