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     print_enable = true;
  75     debug_enable = true;
  76     debug_matrix = true;
  77     debug_keyboard = true;
  78     debug_mouse = true;
  79     print("debug enabled.\n");
  80     return;
  81 }
  82
  83 uint8_t matrix_scan(void)
  84 {
  85     uint16_t codes;
  86     uint8_t key0, key1;
  87
  88     is_modified = false;
  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         if (debug_matrix) print("adb_host_kbd_recv: ERROR(matrix cleared.)\n");
 105         // clear matrix to unregister all keys
 106         for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 107         return key1;
 108     } else {
 109         register_key(key0);
 110         if (key1 != 0xFF)       // key1 is 0xFF when no second key.
 111             register_key(key1);
 112     }
 113
 114     return 1;
 115 }
 116
 117 bool matrix_is_modified(void)
 118 {
 119     return is_modified;
 120 }
 121
 122 inline
 123 bool matrix_has_ghost(void)
 124 {
 125 #ifdef MATRIX_HAS_GHOST
 126     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 127         if (matrix_has_ghost_in_row(i))
 128             return true;
 129     }
 130 #endif
 131     return false;
 132 }
 133
 134 inline
 135 bool matrix_is_on(uint8_t row, uint8_t col)
 136 {
 137     return (matrix[row] & (1<<col));
 138 }
 139
 140 inline
 141 #if (MATRIX_COLS <= 8)
 142 uint8_t matrix_get_row(uint8_t row)
 143 #else
 144 uint16_t matrix_get_row(uint8_t row)
 145 #endif
 146 {
 147     return matrix[row];
 148 }
 149
 150 void matrix_print(void)
 151 {
 152     if (!debug_matrix) return;
 153 #if (MATRIX_COLS <= 8)
 154     print("r/c 01234567\n");
 155 #else
 156     print("r/c 0123456789ABCDEF\n");
 157 #endif
 158     for (uint8_t row = 0; row < matrix_rows(); row++) {
 159         phex(row); print(": ");
 160 #if (MATRIX_COLS <= 8)
 161         pbin_reverse(matrix_get_row(row));
 162 #else
 163         pbin_reverse16(matrix_get_row(row));
 164 #endif
 165 #ifdef MATRIX_HAS_GHOST
 166         if (matrix_has_ghost_in_row(row)) {
 167             print(" <ghost");
 168         }
 169 #endif
 170         print("\n");
 171     }
 172 }
 173
 174 uint8_t matrix_key_count(void)
 175 {
 176     uint8_t count = 0;
 177     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 178 #if (MATRIX_COLS <= 8)
 179         count += bitpop(matrix[i]);
 180 #else
 181         count += bitpop16(matrix[i]);
 182 #endif
 183     }
 184     return count;
 185 }
 186
 187 #ifdef MATRIX_HAS_GHOST
 188 inline
 189 static bool matrix_has_ghost_in_row(uint8_t row)
 190 {
 191     // no ghost exists in case less than 2 keys on
 192     if (((matrix[row] - 1) & matrix[row]) == 0)
 193         return false;
 194
 195     // ghost exists in case same state as other row
 196     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 197         if (i != row && (matrix[i] & matrix[row]) == matrix[row])
 198             return true;
 199     }
 200     return false;
 201 }
 202 #endif
 203
 204 inline
 205 static void register_key(uint8_t key)
 206 {
 207     uint8_t col, row;
 208     col = key&0x07;
 209     row = (key>>3)&0x0F;
 210     if (key&0x80) {
 211         matrix[row] &= ~(1<<col);
 212     } else {
 213         matrix[row] |=  (1<<col);
 214     }
 215     is_modified = true;
 216 }