layer.c

   1 #include "keymap_skel.h"
   2 #include "usb_keyboard.h"
   3 #include "debug.h"
   4 #include "timer.h"
   5 #include "layer.h"
   6
   7 /*
   8  * LAYER_ENTER_DELAY: prevent from moving new layer
   9  *                     press                release
  10  * Fn key sate     ____|~~~~~~~~~~~~~~~~~~~|_______________
  11  *
  12  * enter_delay         |======|
  13  *                              new layer
  14  * Layer sw        ___________|~~~~~~~~~~~~|_______________
  15  */
  16 #define LAYER_ENTER_DELAY 10
  17
  18 /*
  19  * LAYER_SEND_FN_TERM: send keycode if release key in this term
  20  *                     press          release(send)
  21  * Fn key state    ____|~~~~~~~~~~~~~|_______________
  22  *                     press         |       release(not send)
  23  * Fn key state    ____|~~~~~~~~~~~~~|~~~~~~|__________
  24  *                                   |      |
  25  * send_fn_term        |=============o==|   x
  26  */
  27 #define LAYER_SEND_FN_TERM 30
  28
  29
  30 static uint8_t current_layer = 0;
  31 static bool layer_used = false;
  32
  33
  34 uint8_t layer_get_keycode(uint8_t row, uint8_t col)
  35 {
  36     uint8_t code = keymap_get_keycode(current_layer, row, col);
  37     // normal key or mouse key
  38     if ((IS_KEY(code) || IS_MOUSE(code)))
  39         layer_used = true;
  40     return code;
  41 }
  42
  43 void layer_switching(uint8_t fn_bits)
  44 {
  45     // layer switching
  46     static uint8_t last_bits = 0;
  47     static uint8_t last_mod = 0;
  48     static uint16_t last_timer = 0;
  49
  50     //uint16_t now_timer;
  51
  52     if (fn_bits == last_bits) {
  53         // switch layer when specific time elapsed
  54         if (current_layer != keymap_fn_layer(fn_bits) &&
  55                 timer_elapsed(last_timer) > LAYER_ENTER_DELAY) {
  56             current_layer = keymap_fn_layer(fn_bits);
  57             debug("time_elapsed: "); debug_hex16(timer_elapsed(last_timer)); debug("\n");
  58             debug("switch layer: "); debug_hex(current_layer); debug("\n");
  59         }
  60     } else if (fn_bits == 0) {
  61         // send key when Fn key is released without using the layer and within specific time
  62         if ((!layer_used || current_layer != keymap_fn_layer(last_bits)) &&
  63                 timer_elapsed(last_timer) < LAYER_SEND_FN_TERM) {
  64             uint8_t code = keymap_fn_keycode(last_bits);
  65             if (code != KB_NO) {
  66                 if (IS_MOD(code)) {
  67                     keyboard_modifier_keys = last_mod | MOD_BIT(code);
  68                 } else {
  69                     keyboard_keys[0] = code;
  70                     keyboard_modifier_keys = last_mod;
  71                 }
  72                 usb_keyboard_send();
  73                 usb_keyboard_print();
  74                 usb_keyboard_clear();
  75             }
  76         }
  77         last_bits = 0;
  78         last_mod = 0;
  79         layer_used = false;
  80         current_layer = 0; // default layer
  81     } else if ((fn_bits & (fn_bits - 1)) == 0) {
  82         // switch layer when just one Fn Key is pressed
  83         if (!usb_keyboard_has_key()) {
  84             last_bits = fn_bits;
  85             last_mod = keyboard_modifier_keys;
  86             last_timer = timer_read();
  87             debug("last_bits: "); debug_bin(last_bits); debug("\n");
  88             debug("last_mod: "); debug_hex(last_mod); debug("\n");
  89             debug("last_timer: "); debug_hex16(last_timer); debug("\n");
  90         }
  91     }
  92 }