3 * Rotary encoder routine.
4 * Copyright (C) 2013-10-21 K.Ohta <whatisthis.sowhat ai gmail.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2,
10 * or (at your option) any later version.
11 * This library / program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14 * See the GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this library; see the file COPYING. If not, write to the
18 * Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
21 * As a special exception, if you link this(includeed from sdcc) library
22 * with other files, some of which are compiled with SDCC,
23 * to produce an executable, this library does not by itself cause
24 * the resulting executable to be covered by the GNU General Public License.
25 * This exception does not however invalidate any other reasons why
26 * the executable file might be covered by the GNU General Public License.
30 unsigned char renc_state_a;
31 unsigned char renc_state_b;
32 unsigned char renc_dir;
33 unsigned char renc_count;
34 unsigned char renc_reset_count;
36 void rencoder_up(unsigned char dir)
38 if(dir == RENC_NONE) return;
47 void rencoder_init(void)
59 void rencoder_restart(void)
63 void rencoder_start(void)
65 T1CON = 0b10110100;// RD16, T1RUN=0, 1/32 fOSC, TNR1CS=0, TMR1ON=0;
66 TMR1H = 63036 >> 8; // Tick = 4us, Count = 2500
75 void rencoder_stop(void)
87 void rencoder_count(void)
89 unsigned char dir = 0;
92 if(renc_state_a != 0){
102 if(dir != RENC_NONE) {
103 if(dir == renc_dir) {
109 renc_reset_count = 0;
112 if(renc_reset_count >= 100) { // 1000ms
114 renc_dir = RENC_NONE;
117 renc_reset_count = 0;
123 renc_state_a = RENC_PH_A;
124 renc_state_b = RENC_PH_B;