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1 /*
2  * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
3  * Copyright 2019 Drashna Jaelre (Christopher Courtney) <drashna@live.com>
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18
19 #include "dip_switch.h"
20
21 // for memcpy
22 #include <string.h>
23
24 #if !defined(DIP_SWITCH_PINS)
25 #    error "No DIP switch pads defined by DIP_SWITCH_PINS"
26 #endif
27
28 #define NUMBER_OF_DIP_SWITCHES (sizeof(dip_switch_pad) / sizeof(pin_t))
29 static pin_t dip_switch_pad[]                              = DIP_SWITCH_PINS;
30 static bool  dip_switch_state[NUMBER_OF_DIP_SWITCHES]      = {0};
31 static bool  last_dip_switch_state[NUMBER_OF_DIP_SWITCHES] = {0};
32
33 __attribute__((weak)) void dip_switch_update_user(uint8_t index, bool active) {}
34
35 __attribute__((weak)) void dip_switch_update_kb(uint8_t index, bool active) { dip_switch_update_user(index, active); }
36
37 __attribute__((weak)) void dip_switch_update_mask_user(uint32_t state) {}
38
39 __attribute__((weak)) void dip_switch_update_mask_kb(uint32_t state) { dip_switch_update_mask_user(state); }
40
41 void dip_switch_init(void) {
42     for (uint8_t i = 0; i < NUMBER_OF_DIP_SWITCHES; i++) {
43         setPinInputHigh(dip_switch_pad[i]);
44     }
45     dip_switch_read(true);
46 }
47
48 void dip_switch_read(bool forced) {
49     bool     has_dip_state_changed = false;
50     uint32_t dip_switch_mask       = 0;
51
52     for (uint8_t i = 0; i < NUMBER_OF_DIP_SWITCHES; i++) {
53         dip_switch_state[i] = !readPin(dip_switch_pad[i]);
54         dip_switch_mask |= dip_switch_state[i] << i;
55         if (last_dip_switch_state[i] ^ dip_switch_state[i] || forced) {
56             has_dip_state_changed = true;
57             dip_switch_update_kb(i, dip_switch_state[i]);
58         }
59     }
60     if (has_dip_state_changed) {
61         dip_switch_update_mask_kb(dip_switch_mask);
62     }
63     memcpy(last_dip_switch_state, dip_switch_state, sizeof(&dip_switch_state));
64 }