quantum/dip_switch.c

   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 }