converter/terminal_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 #include <stdint.h>
  19 #include <stdbool.h>
  20 #include <avr/io.h>
  21 #include <util/delay.h>
  22 #include "print.h"
  23 #include "util.h"
  24 #include "debug.h"
  25 #include "ps2.h"
  26 #include "matrix.h"
  27
  28
  29 static void matrix_make(uint8_t code);
  30 static void matrix_break(uint8_t code);
  31 #ifdef MATRIX_HAS_GHOST
  32 static bool matrix_has_ghost_in_row(uint8_t row);
  33 #endif
  34
  35
  36 /*
  37  * Matrix Array usage:
  38  * 'Scan Code Set 3' is assigned into 17x8 cell matrix.
  39  *
  40  *    8bit wide
  41  *   +---------+
  42  *  0|         |
  43  *  :|         | 0x00-0x87
  44  *  ;|         |
  45  * 17|         |
  46  *   +---------+
  47  */
  48 static uint8_t matrix[MATRIX_ROWS];
  49 #define ROW(code)      (code>>3)
  50 #define COL(code)      (code&0x07)
  51
  52 static bool is_modified = false;
  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     print_enable = true;
  70     debug_enable = true;
  71     //debug_matrix = true;
  72     //debug_keyboard = true;
  73     //debug_mouse = false;
  74
  75     ps2_host_init();
  76     // Make and Break code without Typematic
  77     while (ps2_host_send(0xF8) != 0xFA) {
  78         debug("send F8: failed\n");
  79         _delay_ms(500);
  80     }
  81     debug("send F8: OK\n");
  82
  83
  84     // initialize matrix state: all keys off
  85     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  86
  87     return;
  88 }
  89
  90 uint8_t matrix_scan(void)
  91 {
  92
  93     // scan code reading states
  94     static enum {
  95         INIT,
  96         F0,
  97     } state = INIT;
  98
  99
 100     is_modified = false;
 101
 102     uint8_t code;
 103     while ((code = ps2_host_recv())) {
 104         debug_hex(code);
 105         switch (state) {
 106             case INIT:
 107                 switch (code) {
 108                     case 0xF0:
 109                         state = F0;
 110                         debug(" ");
 111                         break;
 112                     default:    // normal key make
 113                         if (code < 0x88) {
 114                             matrix_make(code);
 115                         } else {
 116                             debug("unexpected scan code at INIT: "); debug_hex(code); debug("\n");
 117                         }
 118                         state = INIT;
 119                         debug("\n");
 120                 }
 121                 break;
 122             case F0:    // Break code
 123                 switch (code) {
 124                     default:
 125                     if (code < 0x88) {
 126                         matrix_break(code);
 127                     } else {
 128                         debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
 129                     }
 130                     state = INIT;
 131                     debug("\n");
 132                 }
 133                 break;
 134         }
 135     }
 136     return 1;
 137 }
 138
 139 bool matrix_is_modified(void)
 140 {
 141     return is_modified;
 142 }
 143
 144 inline
 145 bool matrix_has_ghost(void)
 146 {
 147 #ifdef MATRIX_HAS_GHOST
 148     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 149         if (matrix_has_ghost_in_row(i))
 150             return true;
 151     }
 152 #endif
 153     return false;
 154 }
 155
 156 inline
 157 bool matrix_is_on(uint8_t row, uint8_t col)
 158 {
 159     return (matrix[row] & (1<<col));
 160 }
 161
 162 inline
 163 uint8_t matrix_get_row(uint8_t row)
 164 {
 165     return matrix[row];
 166 }
 167
 168 void matrix_print(void)
 169 {
 170     print("\nr/c 01234567\n");
 171     for (uint8_t row = 0; row < matrix_rows(); row++) {
 172         phex(row); print(": ");
 173         pbin_reverse(matrix_get_row(row));
 174 #ifdef MATRIX_HAS_GHOST
 175         if (matrix_has_ghost_in_row(row)) {
 176             print(" <ghost");
 177         }
 178 #endif
 179         print("\n");
 180     }
 181 }
 182
 183 uint8_t matrix_key_count(void)
 184 {
 185     uint8_t count = 0;
 186     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 187         count += bitpop(matrix[i]);
 188     }
 189     return count;
 190 }
 191
 192 #ifdef MATRIX_HAS_GHOST
 193 inline
 194 static bool matrix_has_ghost_in_row(uint8_t row)
 195 {
 196     // no ghost exists in case less than 2 keys on
 197     if (((matrix[row] - 1) & matrix[row]) == 0)
 198         return false;
 199
 200     // ghost exists in case same state as other row
 201     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 202         if (i != row && (matrix[i] & matrix[row]) == matrix[row])
 203             return true;
 204     }
 205     return false;
 206 }
 207 #endif
 208
 209
 210 inline
 211 static void matrix_make(uint8_t code)
 212 {
 213     if (!matrix_is_on(ROW(code), COL(code))) {
 214         matrix[ROW(code)] |= 1<<COL(code);
 215         is_modified = true;
 216     }
 217 }
 218
 219 inline
 220 static void matrix_break(uint8_t code)
 221 {
 222     if (matrix_is_on(ROW(code), COL(code))) {
 223         matrix[ROW(code)] &= ~(1<<COL(code));
 224         is_modified = true;
 225     }
 226 }