converter/adb_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 "adb.h"
  29 #include "matrix.h"
  30
  31
  32 #if (MATRIX_COLS > 16)
  33 #   error "MATRIX_COLS must not exceed 16"
  34 #endif
  35 #if (MATRIX_ROWS > 255)
  36 #   error "MATRIX_ROWS must not exceed 255"
  37 #endif
  38
  39
  40 static bool is_modified = false;
  41
  42 // matrix state buffer(1:on, 0:off)
  43 #if (MATRIX_COLS <= 8)
  44 static uint8_t matrix[MATRIX_ROWS];
  45 #else
  46 static uint16_t matrix[MATRIX_ROWS];
  47 #endif
  48
  49 #ifdef MATRIX_HAS_GHOST
  50 static bool matrix_has_ghost_in_row(uint8_t row);
  51 #endif
  52 static void register_key(uint8_t key);
  53
  54
  55 inline
  56 uint8_t matrix_rows(void)
  57 {
  58     return MATRIX_ROWS;
  59 }
  60
  61 inline
  62 uint8_t matrix_cols(void)
  63 {
  64     return MATRIX_COLS;
  65 }
  66
  67 void matrix_init(void)
  68 {
  69     adb_host_init();
  70
  71     // initialize matrix state: all keys off
  72     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  73
  74     debug_enable = true;
  75     debug_matrix = true;
  76     debug_keyboard = true;
  77     debug_mouse = true;
  78     print("debug enabled.\n");
  79     return;
  80 }
  81
  82 uint8_t matrix_scan(void)
  83 {
  84     uint16_t codes;
  85     uint8_t key0, key1;
  86
  87     is_modified = false;
  88     _delay_ms(12);  // delay for preventing overload of poor ADB keyboard controller
  89     codes = adb_host_kbd_recv();
  90     key0 = codes>>8;
  91     key1 = codes&0xFF;
  92
  93     if (debug_matrix && codes) {
  94         print("adb_host_kbd_recv: "); phex16(codes); print("\n");
  95     }
  96
  97     if (codes == 0) {                           // no keys
  98         return 0;
  99     } else if (codes == 0x7F7F) {   // power key press
 100         register_key(0x7F);
 101     } else if (codes == 0xFFFF) {   // power key release
 102         register_key(0xFF);
 103     } else if (key0 == 0xFF) {      // error
 104         xprintf("adb_host_kbd_recv: ERROR(%02X)\n", codes);
 105         return key1;
 106     } else {
 107         register_key(key0);
 108         if (key1 != 0xFF)       // key1 is 0xFF when no second key.
 109             register_key(key1);
 110     }
 111
 112     return 1;
 113 }
 114
 115 bool matrix_is_modified(void)
 116 {
 117     return is_modified;
 118 }
 119
 120 inline
 121 bool matrix_has_ghost(void)
 122 {
 123 #ifdef MATRIX_HAS_GHOST
 124     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 125         if (matrix_has_ghost_in_row(i))
 126             return true;
 127     }
 128 #endif
 129     return false;
 130 }
 131
 132 inline
 133 bool matrix_is_on(uint8_t row, uint8_t col)
 134 {
 135     return (matrix[row] & (1<<col));
 136 }
 137
 138 inline
 139 #if (MATRIX_COLS <= 8)
 140 uint8_t matrix_get_row(uint8_t row)
 141 #else
 142 uint16_t matrix_get_row(uint8_t row)
 143 #endif
 144 {
 145     return matrix[row];
 146 }
 147
 148 void matrix_print(void)
 149 {
 150     if (!debug_matrix) return;
 151 #if (MATRIX_COLS <= 8)
 152     print("r/c 01234567\n");
 153 #else
 154     print("r/c 0123456789ABCDEF\n");
 155 #endif
 156     for (uint8_t row = 0; row < matrix_rows(); row++) {
 157         phex(row); print(": ");
 158 #if (MATRIX_COLS <= 8)
 159         pbin_reverse(matrix_get_row(row));
 160 #else
 161         pbin_reverse16(matrix_get_row(row));
 162 #endif
 163 #ifdef MATRIX_HAS_GHOST
 164         if (matrix_has_ghost_in_row(row)) {
 165             print(" <ghost");
 166         }
 167 #endif
 168         print("\n");
 169     }
 170 }
 171
 172 uint8_t matrix_key_count(void)
 173 {
 174     uint8_t count = 0;
 175     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 176 #if (MATRIX_COLS <= 8)
 177         count += bitpop(matrix[i]);
 178 #else
 179         count += bitpop16(matrix[i]);
 180 #endif
 181     }
 182     return count;
 183 }
 184
 185 #ifdef MATRIX_HAS_GHOST
 186 inline
 187 static bool matrix_has_ghost_in_row(uint8_t row)
 188 {
 189     // no ghost exists in case less than 2 keys on
 190     if (((matrix[row] - 1) & matrix[row]) == 0)
 191         return false;
 192
 193     // ghost exists in case same state as other row
 194     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 195         if (i != row && (matrix[i] & matrix[row]) == matrix[row])
 196             return true;
 197     }
 198     return false;
 199 }
 200 #endif
 201
 202 inline
 203 static void register_key(uint8_t key)
 204 {
 205     uint8_t col, row;
 206     col = key&0x07;
 207     row = (key>>3)&0x0F;
 208     if (key&0x80) {
 209         matrix[row] &= ~(1<<col);
 210     } else {
 211         matrix[row] |=  (1<<col);
 212     }
 213     is_modified = true;
 214 }