m0110_usb/matrix.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 /*
  19  * scan matrix
  20  */
  21 #include <stdint.h>
  22 #include <stdbool.h>
  23 #include <avr/io.h>
  24 #include <util/delay.h>
  25 #include "print.h"
  26 #include "util.h"
  27 #include "debug.h"
  28 #include "host.h"
  29 #include "led.h"
  30 #include "m0110.h"
  31 #include "matrix.h"
  32
  33
  34 #define CAPS        0x39
  35 #define CAPS_UP     (CAPS | 0x80)
  36 #define ROW(key)    ((key)>>3&0x0F)
  37 #define COL(key)    ((key)&0x07)
  38
  39
  40 static bool is_modified = false;
  41
  42 // matrix state buffer(1:on, 0:off)
  43 static uint8_t *matrix;
  44 static uint8_t _matrix0[MATRIX_ROWS];
  45
  46 #ifdef MATRIX_HAS_GHOST
  47 static bool matrix_has_ghost_in_row(uint8_t row);
  48 #endif
  49 static void register_key(uint8_t key);
  50
  51
  52 inline
  53 uint8_t matrix_rows(void)
  54 {
  55     return MATRIX_ROWS;
  56 }
  57
  58 inline
  59 uint8_t matrix_cols(void)
  60 {
  61     return MATRIX_COLS;
  62 }
  63
  64 void matrix_init(void)
  65 {
  66     print_enable = true;
  67     debug_enable = true;
  68     debug_matrix = false;
  69     debug_keyboard = false;
  70     debug_mouse = false;
  71     print("debug enabled.\n");
  72
  73     m0110_init();
  74     // initialize matrix state: all keys off
  75     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
  76     matrix = _matrix0;
  77     return;
  78 }
  79
  80 uint8_t matrix_scan(void)
  81 {
  82     uint8_t key;
  83
  84     is_modified = false;
  85     key = m0110_recv_key();
  86
  87 #ifdef MATRIX_HAS_LOCKING_CAPS
  88     // Send Caps key up event
  89     if (matrix_is_on(ROW(CAPS), COL(CAPS))) {
  90         is_modified = true;
  91         register_key(CAPS_UP);
  92     }
  93 #endif
  94     if (key == M0110_NULL) {
  95         return 0;
  96     } else {
  97 #ifdef MATRIX_HAS_LOCKING_CAPS
  98         if (host_keyboard_leds() & (1<<USB_LED_CAPS_LOCK)) {
  99             // CAPS LOCK on:
 100             // Ignore LockingCaps key down event
 101             if (key == CAPS) return 0;
 102             // Convert LockingCaps key up event into down event
 103             if (key == CAPS_UP) key = CAPS;
 104         } else {
 105             // CAPS LOCK off:
 106             // Ignore LockingCaps key up event
 107             if (key == CAPS_UP) return 0;
 108         }
 109 #endif
 110         is_modified = true;
 111         register_key(key);
 112     }
 113
 114     if (debug_enable) {
 115         print("key: "); phex(key); print("\n");
 116     }
 117     return 1;
 118 }
 119
 120 bool matrix_is_modified(void)
 121 {
 122     return is_modified;
 123 }
 124
 125 inline
 126 bool matrix_has_ghost(void)
 127 {
 128 #ifdef MATRIX_HAS_GHOST
 129     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 130         if (matrix_has_ghost_in_row(i))
 131             return true;
 132     }
 133 #endif
 134     return false;
 135 }
 136
 137 inline
 138 bool matrix_is_on(uint8_t row, uint8_t col)
 139 {
 140     return (matrix[row] & (1<<col));
 141 }
 142
 143 inline
 144 uint8_t matrix_get_row(uint8_t row)
 145 {
 146     return matrix[row];
 147 }
 148
 149 void matrix_print(void)
 150 {
 151     print("\nr/c 01234567\n");
 152     for (uint8_t row = 0; row < matrix_rows(); row++) {
 153         phex(row); print(": ");
 154         pbin_reverse(matrix_get_row(row));
 155         print("\n");
 156     }
 157 }
 158
 159 uint8_t matrix_key_count(void)
 160 {
 161     uint8_t count = 0;
 162     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 163         count += bitpop(matrix[i]);
 164     }
 165     return count;
 166 }
 167
 168 #ifdef MATRIX_HAS_GHOST
 169 inline
 170 static bool matrix_has_ghost_in_row(uint8_t row)
 171 {
 172     // no ghost exists in case less than 2 keys on
 173     if (((matrix[row] - 1) & matrix[row]) == 0)
 174         return false;
 175
 176     // ghost exists in case same state as other row
 177     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 178         if (i != row && (matrix[i] & matrix[row]) == matrix[row])
 179             return true;
 180     }
 181     return false;
 182 }
 183 #endif
 184
 185 inline
 186 static void register_key(uint8_t key)
 187 {
 188     if (key&0x80) {
 189         matrix[ROW(key)] &= ~(1<<COL(key));
 190     } else {
 191         matrix[ROW(key)] |=  (1<<COL(key));
 192     }
 193 }