tmk_core/common/action_tapping.c

   1 #include <stdint.h>
   2 #include <stdbool.h>
   3 #include "action.h"
   4 #include "action_layer.h"
   5 #include "action_tapping.h"
   6 #include "keycode.h"
   7 #include "timer.h"
   8
   9 #ifdef DEBUG_ACTION
  10 #include "debug.h"
  11 #else
  12 #include "nodebug.h"
  13 #endif
  14
  15 #ifndef NO_ACTION_TAPPING
  16
  17 #define IS_TAPPING()            !IS_NOEVENT(tapping_key.event)
  18 #define IS_TAPPING_PRESSED()    (IS_TAPPING() && tapping_key.event.pressed)
  19 #define IS_TAPPING_RELEASED()   (IS_TAPPING() && !tapping_key.event.pressed)
  20 #define IS_TAPPING_KEY(k)       (IS_TAPPING() && KEYEQ(tapping_key.event.key, (k)))
  21 #define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
  22
  23
  24 static keyrecord_t tapping_key = {};
  25 static keyrecord_t waiting_buffer[WAITING_BUFFER_SIZE] = {};
  26 static uint8_t waiting_buffer_head = 0;
  27 static uint8_t waiting_buffer_tail = 0;
  28
  29 static bool process_tapping(keyrecord_t *record);
  30 static bool waiting_buffer_enq(keyrecord_t record);
  31 static void waiting_buffer_clear(void);
  32 static bool waiting_buffer_typed(keyevent_t event);
  33 static void waiting_buffer_scan_tap(void);
  34 static void debug_tapping_key(void);
  35 static void debug_waiting_buffer(void);
  36
  37
  38 void action_tapping_process(keyrecord_t record)
  39 {
  40     if (process_tapping(&record)) {
  41         if (!IS_NOEVENT(record.event)) {
  42             debug("processed: "); debug_record(record); debug("\n");
  43         }
  44     } else {
  45         if (!waiting_buffer_enq(record)) {
  46             // clear all in case of overflow.
  47             debug("OVERFLOW: CLEAR ALL STATES\n");
  48             clear_keyboard();
  49             waiting_buffer_clear();
  50             tapping_key = (keyrecord_t){};
  51         }
  52     }
  53
  54     // process waiting_buffer
  55     if (!IS_NOEVENT(record.event) && waiting_buffer_head != waiting_buffer_tail) {
  56         debug("---- action_exec: process waiting_buffer -----\n");
  57     }
  58     for (; waiting_buffer_tail != waiting_buffer_head; waiting_buffer_tail = (waiting_buffer_tail + 1) % WAITING_BUFFER_SIZE) {
  59         if (process_tapping(&waiting_buffer[waiting_buffer_tail])) {
  60             debug("processed: waiting_buffer["); debug_dec(waiting_buffer_tail); debug("] = ");
  61             debug_record(waiting_buffer[waiting_buffer_tail]); debug("\n\n");
  62         } else {
  63             break;
  64         }
  65     }
  66     if (!IS_NOEVENT(record.event)) {
  67         debug("\n");
  68     }
  69 }
  70
  71
  72 /* Tapping
  73  *
  74  * Rule: Tap key is typed(pressed and released) within TAPPING_TERM.
  75  *       (without interfering by typing other key)
  76  */
  77 /* return true when key event is processed or consumed. */
  78 bool process_tapping(keyrecord_t *keyp)
  79 {
  80     keyevent_t event = keyp->event;
  81
  82     // if tapping
  83     if (IS_TAPPING_PRESSED()) {
  84         if (WITHIN_TAPPING_TERM(event)) {
  85             if (tapping_key.tap.count == 0) {
  86                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
  87                     // first tap!
  88                     debug("Tapping: First tap(0->1).\n");
  89                     tapping_key.tap.count = 1;
  90                     debug_tapping_key();
  91                     process_action(&tapping_key);
  92
  93                     // copy tapping state
  94                     keyp->tap = tapping_key.tap;
  95                     // enqueue
  96                     return false;
  97                 }
  98 #if TAPPING_TERM >= 500
  99                 /* Process a key typed within TAPPING_TERM
 100                  * This can register the key before settlement of tapping,
 101                  * useful for long TAPPING_TERM but may prevent fast typing.
 102                  */
 103                 else if (IS_RELEASED(event) && waiting_buffer_typed(event)) {
 104                     debug("Tapping: End. No tap. Interfered by typing key\n");
 105                     process_action(&tapping_key);
 106                     tapping_key = (keyrecord_t){};
 107                     debug_tapping_key();
 108                     // enqueue
 109                     return false;
 110                 }
 111 #endif
 112                 /* Process release event of a key pressed before tapping starts
 113                  * Without this unexpected repeating will occur with having fast repeating setting
 114                  * https://github.com/tmk/tmk_keyboard/issues/60
 115                  */
 116                 else if (IS_RELEASED(event) && !waiting_buffer_typed(event)) {
 117                     // Modifier should be retained till end of this tapping.
 118                     action_t action = layer_switch_get_action(event);
 119                     switch (action.kind.id) {
 120                         case ACT_LMODS:
 121                         case ACT_RMODS:
 122                             if (action.key.mods && !action.key.code) return false;
 123                             if (IS_MOD(action.key.code)) return false;
 124                             break;
 125                         case ACT_LMODS_TAP:
 126                         case ACT_RMODS_TAP:
 127                             if (action.key.mods && keyp->tap.count == 0) return false;
 128                             if (IS_MOD(action.key.code)) return false;
 129                             break;
 130                     }
 131                     // Release of key should be process immediately.
 132                     debug("Tapping: release event of a key pressed before tapping\n");
 133                     process_action(keyp);
 134                     return true;
 135                 }
 136                 else {
 137                     // set interrupted flag when other key preesed during tapping
 138                     if (event.pressed) {
 139                         tapping_key.tap.interrupted = true;
 140                     }
 141                     // enqueue
 142                     return false;
 143                 }
 144             }
 145             // tap_count > 0
 146             else {
 147                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 148                     debug("Tapping: Tap release("); debug_dec(tapping_key.tap.count); debug(")\n");
 149                     keyp->tap = tapping_key.tap;
 150                     process_action(keyp);
 151                     tapping_key = *keyp;
 152                     debug_tapping_key();
 153                     return true;
 154                 }
 155                 else if (is_tap_key(event) && event.pressed) {
 156                     if (tapping_key.tap.count > 1) {
 157                         debug("Tapping: Start new tap with releasing last tap(>1).\n");
 158                         // unregister key
 159                         process_action(&(keyrecord_t){
 160                                 .tap = tapping_key.tap,
 161                                 .event.key = tapping_key.event.key,
 162                                 .event.time = event.time,
 163                                 .event.pressed = false
 164                         });
 165                     } else {
 166                         debug("Tapping: Start while last tap(1).\n");
 167                     }
 168                     tapping_key = *keyp;
 169                     waiting_buffer_scan_tap();
 170                     debug_tapping_key();
 171                     return true;
 172                 }
 173                 else {
 174                     if (!IS_NOEVENT(event)) {
 175                         debug("Tapping: key event while last tap(>0).\n");
 176                     }
 177                     process_action(keyp);
 178                     return true;
 179                 }
 180             }
 181         }
 182         // after TAPPING_TERM
 183         else {
 184             if (tapping_key.tap.count == 0) {
 185                 debug("Tapping: End. Timeout. Not tap(0): ");
 186                 debug_event(event); debug("\n");
 187                 process_action(&tapping_key);
 188                 tapping_key = (keyrecord_t){};
 189                 debug_tapping_key();
 190                 return false;
 191             }  else {
 192                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 193                     debug("Tapping: End. last timeout tap release(>0).");
 194                     keyp->tap = tapping_key.tap;
 195                     process_action(keyp);
 196                     tapping_key = (keyrecord_t){};
 197                     return true;
 198                 }
 199                 else if (is_tap_key(event) && event.pressed) {
 200                     if (tapping_key.tap.count > 1) {
 201                         debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
 202                         // unregister key
 203                         process_action(&(keyrecord_t){
 204                                 .tap = tapping_key.tap,
 205                                 .event.key = tapping_key.event.key,
 206                                 .event.time = event.time,
 207                                 .event.pressed = false
 208                         });
 209                     } else {
 210                         debug("Tapping: Start while last timeout tap(1).\n");
 211                     }
 212                     tapping_key = *keyp;
 213                     waiting_buffer_scan_tap();
 214                     debug_tapping_key();
 215                     return true;
 216                 }
 217                 else {
 218                     if (!IS_NOEVENT(event)) {
 219                         debug("Tapping: key event while last timeout tap(>0).\n");
 220                     }
 221                     process_action(keyp);
 222                     return true;
 223                 }
 224             }
 225         }
 226     } else if (IS_TAPPING_RELEASED()) {
 227         if (WITHIN_TAPPING_TERM(event)) {
 228             if (event.pressed) {
 229                 if (IS_TAPPING_KEY(event.key)) {
 230                     if (!tapping_key.tap.interrupted && tapping_key.tap.count > 0) {
 231                         // sequential tap.
 232                         keyp->tap = tapping_key.tap;
 233                         if (keyp->tap.count < 15) keyp->tap.count += 1;
 234                         debug("Tapping: Tap press("); debug_dec(keyp->tap.count); debug(")\n");
 235                         process_action(keyp);
 236                         tapping_key = *keyp;
 237                         debug_tapping_key();
 238                         return true;
 239                     } else {
 240                         // FIX: start new tap again
 241                         tapping_key = *keyp;
 242                         return true;
 243                     }
 244                 } else if (is_tap_key(event)) {
 245                     // Sequential tap can be interfered with other tap key.
 246                     debug("Tapping: Start with interfering other tap.\n");
 247                     tapping_key = *keyp;
 248                     waiting_buffer_scan_tap();
 249                     debug_tapping_key();
 250                     return true;
 251                 } else {
 252                     // should none in buffer
 253                     // FIX: interrupted when other key is pressed
 254                     tapping_key.tap.interrupted = true;
 255                     process_action(keyp);
 256                     return true;
 257                 }
 258             } else {
 259                 if (!IS_NOEVENT(event)) debug("Tapping: other key just after tap.\n");
 260                 process_action(keyp);
 261                 return true;
 262             }
 263         } else {
 264             // FIX: process_aciton here?
 265             // timeout. no sequential tap.
 266             debug("Tapping: End(Timeout after releasing last tap): ");
 267             debug_event(event); debug("\n");
 268             tapping_key = (keyrecord_t){};
 269             debug_tapping_key();
 270             return false;
 271         }
 272     }
 273     // not tapping state
 274     else {
 275         if (event.pressed && is_tap_key(event)) {
 276             debug("Tapping: Start(Press tap key).\n");
 277             tapping_key = *keyp;
 278             waiting_buffer_scan_tap();
 279             debug_tapping_key();
 280             return true;
 281         } else {
 282             process_action(keyp);
 283             return true;
 284         }
 285     }
 286 }
 287
 288
 289 /*
 290  * Waiting buffer
 291  */
 292 bool waiting_buffer_enq(keyrecord_t record)
 293 {
 294     if (IS_NOEVENT(record.event)) {
 295         return true;
 296     }
 297
 298     if ((waiting_buffer_head + 1) % WAITING_BUFFER_SIZE == waiting_buffer_tail) {
 299         debug("waiting_buffer_enq: Over flow.\n");
 300         return false;
 301     }
 302
 303     waiting_buffer[waiting_buffer_head] = record;
 304     waiting_buffer_head = (waiting_buffer_head + 1) % WAITING_BUFFER_SIZE;
 305
 306     debug("waiting_buffer_enq: "); debug_waiting_buffer();
 307     return true;
 308 }
 309
 310 void waiting_buffer_clear(void)
 311 {
 312     waiting_buffer_head = 0;
 313     waiting_buffer_tail = 0;
 314 }
 315
 316 bool waiting_buffer_typed(keyevent_t event)
 317 {
 318     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 319         if (KEYEQ(event.key, waiting_buffer[i].event.key) && event.pressed !=  waiting_buffer[i].event.pressed) {
 320             return true;
 321         }
 322     }
 323     return false;
 324 }
 325
 326 /* scan buffer for tapping */
 327 void waiting_buffer_scan_tap(void)
 328 {
 329     // tapping already is settled
 330     if (tapping_key.tap.count > 0) return;
 331     // invalid state: tapping_key released && tap.count == 0
 332     if (!tapping_key.event.pressed) return;
 333
 334     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 335         if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
 336                 !waiting_buffer[i].event.pressed &&
 337                 WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
 338             tapping_key.tap.count = 1;
 339             waiting_buffer[i].tap.count = 1;
 340             process_action(&tapping_key);
 341
 342             debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
 343             debug_waiting_buffer();
 344             return;
 345         }
 346     }
 347 }
 348
 349
 350 /*
 351  * debug print
 352  */
 353 static void debug_tapping_key(void)
 354 {
 355     debug("TAPPING_KEY="); debug_record(tapping_key); debug("\n");
 356 }
 357
 358 static void debug_waiting_buffer(void)
 359 {
 360     debug("{ ");
 361     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 362         debug("["); debug_dec(i); debug("]="); debug_record(waiting_buffer[i]); debug(" ");
 363     }
 364     debug("}\n");
 365 }
 366
 367 #endif