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     codes = adb_host_kbd_recv();
  89     key0 = codes>>8;
  90     key1 = codes&0xFF;
  91
  92     if (debug_matrix && codes) {
  93         print("adb_host_kbd_recv: "); phex16(codes); print("\n");
  94     }
  95
  96     if (codes == 0) {                           // no keys
  97         return 0;
  98     } else if (codes == 0x7F7F) {   // power key press
  99         register_key(0x7F);
 100     } else if (codes == 0xFFFF) {   // power key release
 101         register_key(0xFF);
 102     } else if (key0 == 0xFF) {      // error
 103         if (debug_matrix) print("adb_host_kbd_recv: ERROR(matrix cleared.)\n");
 104         // clear matrix to unregister all keys
 105         for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 106         return key1;
 107     } else {
 108         register_key(key0);
 109         if (key1 != 0xFF)       // key1 is 0xFF when no second key.
 110             register_key(key1);
 111     }
 112
 113     return 1;
 114 }
 115
 116 bool matrix_is_modified(void)
 117 {
 118     return is_modified;
 119 }
 120
 121 inline
 122 bool matrix_has_ghost(void)
 123 {
 124 #ifdef MATRIX_HAS_GHOST
 125     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 126         if (matrix_has_ghost_in_row(i))
 127             return true;
 128     }
 129 #endif
 130     return false;
 131 }
 132
 133 inline
 134 bool matrix_is_on(uint8_t row, uint8_t col)
 135 {
 136     return (matrix[row] & (1<<col));
 137 }
 138
 139 inline
 140 #if (MATRIX_COLS <= 8)
 141 uint8_t matrix_get_row(uint8_t row)
 142 #else
 143 uint16_t matrix_get_row(uint8_t row)
 144 #endif
 145 {
 146     return matrix[row];
 147 }
 148
 149 void matrix_print(void)
 150 {
 151     if (!debug_matrix) return;
 152 #if (MATRIX_COLS <= 8)
 153     print("r/c 01234567\n");
 154 #else
 155     print("r/c 0123456789ABCDEF\n");
 156 #endif
 157     for (uint8_t row = 0; row < matrix_rows(); row++) {
 158         phex(row); print(": ");
 159 #if (MATRIX_COLS <= 8)
 160         pbin_reverse(matrix_get_row(row));
 161 #else
 162         pbin_reverse16(matrix_get_row(row));
 163 #endif
 164 #ifdef MATRIX_HAS_GHOST
 165         if (matrix_has_ghost_in_row(row)) {
 166             print(" <ghost");
 167         }
 168 #endif
 169         print("\n");
 170     }
 171 }
 172
 173 uint8_t matrix_key_count(void)
 174 {
 175     uint8_t count = 0;
 176     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 177 #if (MATRIX_COLS <= 8)
 178         count += bitpop(matrix[i]);
 179 #else
 180         count += bitpop16(matrix[i]);
 181 #endif
 182     }
 183     return count;
 184 }
 185
 186 #ifdef MATRIX_HAS_GHOST
 187 inline
 188 static bool matrix_has_ghost_in_row(uint8_t row)
 189 {
 190     // no ghost exists in case less than 2 keys on
 191     if (((matrix[row] - 1) & matrix[row]) == 0)
 192         return false;
 193
 194     // ghost exists in case same state as other row
 195     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 196         if (i != row && (matrix[i] & matrix[row]) == matrix[row])
 197             return true;
 198     }
 199     return false;
 200 }
 201 #endif
 202
 203 inline
 204 static void register_key(uint8_t key)
 205 {
 206     uint8_t col, row;
 207     col = key&0x07;
 208     row = (key>>3)&0x0F;
 209     if (key&0x80) {
 210         matrix[row] &= ~(1<<col);
 211     } else {
 212         matrix[row] |=  (1<<col);
 213     }
 214     is_modified = true;
 215 }