common/action_tapping.c

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