common/layer.c

   1 /*
   2 Copyright 2011 Jun Wako <wakojun@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include "keymap.h"
  19 #include "host.h"
  20 #include "debug.h"
  21 #include "timer.h"
  22 #include "usb_keycodes.h"
  23 #include "layer.h"
  24
  25
  26 /*
  27  * Parameters:
  28  *     SWITCH_DELAY        |=======|
  29  *     SEND_FN_TERM        |================|
  30  *
  31  * Fn key processing cases:
  32  * 1. release Fn after SEND_FN_TERM.
  33  *     Layer sw         ___________|~~~~~~~~~~~|___
  34  *     Fn press         ___|~~~~~~~~~~~~~~~~~~~|___
  35  *     Fn send          ___________________________
  36  *
  37  * 2. release Fn during SEND_FN_TERM.(not layer used)
  38  *     Layer sw         ___________|~~~~~~|________
  39  *     Fn press         ___|~~~~~~~~~~~~~~|________
  40  *     Fn key send      __________________|~|______
  41  *     other key press  ___________________________
  42  *     other key send   ___________________________
  43  *
  44  * 3. release Fn during SEND_FN_TERM.(layer used)
  45  *     Layer sw         ___________|~~~~~~|________
  46  *     Fn press         ___|~~~~~~~~~~~~~~|________
  47  *     Fn key send      ___________________________
  48  *     Fn send          ___________________________
  49  *     other key press  _____________|~~|__________
  50  *     other key send   _____________|~~|__________
  51  *
  52  * 4. press other key during SWITCH_DELAY.
  53  *     Layer sw         ___________________________
  54  *     Fn key press     ___|~~~~~~~~~|_____________
  55  *     Fn key send      ______|~~~~~~|_____________
  56  *     other key press  ______|~~~|________________
  57  *     other key send   _______|~~|________________
  58  *
  59  * 5. press Fn while press other key.
  60  *     Layer sw         ___________________________
  61  *     Fn key press     ___|~~~~~~~~~|_____________
  62  *     Fn key send      ___|~~~~~~~~~|_____________
  63  *     other key press  ~~~~~~~|___________________
  64  *     other key send   ~~~~~~~|___________________
  65  *
  66  * 6. press Fn twice quickly and keep holding down.(repeat)
  67  *     Layer sw         ___________________________
  68  *     Fn key press     ___|~|____|~~~~~~~~~~~~~~~~
  69  *     Fn key send      _____|~|__|~~~~~~~~~~~~~~~~
  70  */
  71
  72 // LAYER_SWITCH_DELAY: prevent from moving to new layer
  73 #ifndef LAYER_SWITCH_DELAY
  74 #   define LAYER_SWITCH_DELAY 150
  75 #endif
  76
  77 // LAYER_SEND_FN_TERM: send keycode if release key in this term
  78 #ifndef LAYER_SEND_FN_TERM
  79 #   define LAYER_SEND_FN_TERM 500
  80 #endif
  81
  82
  83 uint8_t default_layer = 0;
  84 uint8_t current_layer = 0;
  85
  86 static bool layer_used = false;
  87 static uint8_t new_layer(uint8_t fn_bits);
  88
  89
  90 uint8_t layer_get_keycode(uint8_t row, uint8_t col)
  91 {
  92     uint8_t code = keymap_get_keycode(current_layer, row, col);
  93     // normal key or mouse key
  94     if ((IS_KEY(code) || IS_MOUSEKEY(code))) {
  95         layer_used = true;
  96     }
  97     return code;
  98 }
  99
 100 // bit substract b from a
 101 #define BIT_SUBST(a, b) (a&(a^b))
 102 void layer_switching(uint8_t fn_bits)
 103 {
 104     // layer switching
 105     static uint8_t last_fn = 0;
 106     static uint8_t last_mods = 0;
 107     static uint16_t last_timer = 0;
 108     static uint8_t sent_fn = 0;
 109
 110     if (fn_bits == last_fn) { // Fn state is not changed
 111         if (fn_bits == 0) {
 112             // do nothing
 113         } else {
 114             if (!keymap_fn_keycode(BIT_SUBST(fn_bits, sent_fn)) ||
 115                     timer_elapsed(last_timer) > LAYER_SWITCH_DELAY) {
 116                 uint8_t _layer_to_switch = new_layer(BIT_SUBST(fn_bits, sent_fn));
 117                 if (current_layer != _layer_to_switch) { // not switch layer yet
 118                     debug("Fn case: 1,2,3(LAYER_SWITCH_DELAY passed)\n");
 119                     debug("Switch Layer: "); debug_hex(current_layer);
 120                     current_layer = _layer_to_switch;
 121                     layer_used = false;
 122                     debug(" -> "); debug_hex(current_layer); debug("\n");
 123                 }
 124             } else {
 125                 if (host_has_anykey()) { // other keys is pressed
 126                     uint8_t _fn_to_send = BIT_SUBST(fn_bits, sent_fn);
 127                     if (_fn_to_send) {
 128                         debug("Fn case: 4(press other key during SWITCH_DELAY.)\n");
 129                         // send only Fn key first
 130                         uint8_t tmp_mods = keyboard_report->mods;
 131                         host_add_code(keymap_fn_keycode(_fn_to_send));
 132                         host_set_mods(last_mods);
 133                         host_send_keyboard_report();
 134                         host_set_mods(tmp_mods);
 135                         host_del_code(keymap_fn_keycode(_fn_to_send));
 136                         sent_fn |= _fn_to_send;
 137                     }
 138                 }
 139             }
 140             // add Fn keys to send
 141             //host_add_code(keymap_fn_keycode(fn_bits&sent_fn));  // TODO: do all Fn keys
 142         }
 143     } else { // Fn state is changed(edge)
 144         uint8_t fn_changed = 0;
 145
 146         debug("fn_bits: "); debug_bin(fn_bits); debug("\n");
 147         debug("sent_fn: "); debug_bin(sent_fn); debug("\n");
 148         debug("last_fn: "); debug_bin(last_fn); debug("\n");
 149         debug("last_mods: "); debug_hex(last_mods); debug("\n");
 150         debug("last_timer: "); debug_hex16(last_timer); debug("\n");
 151         debug("timer_count: "); debug_hex16(timer_count); debug("\n");
 152
 153         // pressed Fn
 154         if ((fn_changed = BIT_SUBST(fn_bits, last_fn))) {
 155             debug("fn_changed: "); debug_bin(fn_changed); debug("\n");
 156             if (host_has_anykey()) {
 157                 debug("Fn case: 5(pressed Fn with other key)\n");
 158                 sent_fn |= fn_changed;
 159             } else if (fn_changed & sent_fn) { // pressed same Fn in a row
 160                 if (timer_elapsed(last_timer) > LAYER_SEND_FN_TERM) {
 161                     debug("Fn case: 6(not repeat)\n");
 162                     // time passed: not repeate
 163                     sent_fn &= ~fn_changed;
 164                 } else {
 165                     debug("Fn case: 6(repeat)\n");
 166                 }
 167             }
 168         }
 169         // released Fn
 170         if ((fn_changed = BIT_SUBST(last_fn, fn_bits))) {
 171             debug("fn_changed: "); debug_bin(fn_changed); debug("\n");
 172             if (timer_elapsed(last_timer) < LAYER_SEND_FN_TERM) {
 173                 if (!layer_used && BIT_SUBST(fn_changed, sent_fn)) {
 174                     debug("Fn case: 2(send Fn one shot: released Fn during LAYER_SEND_FN_TERM)\n");
 175                     // send only Fn key first
 176                     uint8_t tmp_mods = keyboard_report->mods;
 177                     host_add_code(keymap_fn_keycode(fn_changed));
 178                     host_set_mods(last_mods);
 179                     host_send_keyboard_report();
 180                     host_set_mods(tmp_mods);
 181                     host_del_code(keymap_fn_keycode(fn_changed));
 182                     sent_fn |= fn_changed;
 183                 }
 184             }
 185             debug("Switch Layer(released Fn): "); debug_hex(current_layer);
 186             current_layer = new_layer(BIT_SUBST(fn_bits, sent_fn));
 187             debug(" -> "); debug_hex(current_layer); debug("\n");
 188         }
 189
 190         layer_used = false;
 191         last_fn = fn_bits;
 192         last_mods = keyboard_report->mods;
 193         last_timer = timer_read();
 194     }
 195     // send Fn keys
 196     for (uint8_t i = 0; i < 8; i++) {
 197         if ((sent_fn & fn_bits) & (1<<i)) {
 198             host_add_code(keymap_fn_keycode(1<<i));
 199         }
 200     }
 201 }
 202
 203 inline
 204 static uint8_t new_layer(uint8_t fn_bits)
 205 {
 206     return (fn_bits ? keymap_fn_layer(fn_bits) : default_layer);
 207 }