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     // wait for keyboard to boot up and receive command
  71     _delay_ms(1000);
  72     // Enable keyboard left/right modifier distinction
  73     // Addr:Keyboard(0010), Cmd:Listen(10), Register3(11)
  74     // upper byte: reserved bits 0000, device address 0010
  75     // lower byte: device handler 00000011
  76     adb_host_listen(0x2B,0x02,0x03);
  77
  78     // initialize matrix state: all keys off
  79     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  80
  81     debug_enable = true;
  82     //debug_matrix = true;
  83     //debug_keyboard = true;
  84     //debug_mouse = true;
  85     print("debug enabled.\n");
  86     return;
  87 }
  88
  89 uint8_t matrix_scan(void)
  90 {
  91     uint16_t codes;
  92     uint8_t key0, key1;
  93
  94     is_modified = false;
  95     _delay_ms(12);  // delay for preventing overload of poor ADB keyboard controller
  96     codes = adb_host_kbd_recv();
  97     key0 = codes>>8;
  98     key1 = codes&0xFF;
  99
 100     if (debug_matrix && codes) {
 101         print("adb_host_kbd_recv: "); phex16(codes); print("\n");
 102     }
 103
 104     if (codes == 0) {                           // no keys
 105         return 0;
 106     } else if (codes == 0x7F7F) {   // power key press
 107         register_key(0x7F);
 108     } else if (codes == 0xFFFF) {   // power key release
 109         register_key(0xFF);
 110     } else if (key0 == 0xFF) {      // error
 111         xprintf("adb_host_kbd_recv: ERROR(%d)\n", codes);
 112         return key1;
 113     } else {
 114         register_key(key0);
 115         if (key1 != 0xFF)       // key1 is 0xFF when no second key.
 116             register_key(key1);
 117     }
 118
 119     return 1;
 120 }
 121
 122 bool matrix_is_modified(void)
 123 {
 124     return is_modified;
 125 }
 126
 127 inline
 128 bool matrix_has_ghost(void)
 129 {
 130 #ifdef MATRIX_HAS_GHOST
 131     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 132         if (matrix_has_ghost_in_row(i))
 133             return true;
 134     }
 135 #endif
 136     return false;
 137 }
 138
 139 inline
 140 bool matrix_is_on(uint8_t row, uint8_t col)
 141 {
 142     return (matrix[row] & (1<<col));
 143 }
 144
 145 inline
 146 #if (MATRIX_COLS <= 8)
 147 uint8_t matrix_get_row(uint8_t row)
 148 #else
 149 uint16_t matrix_get_row(uint8_t row)
 150 #endif
 151 {
 152     return matrix[row];
 153 }
 154
 155 void matrix_print(void)
 156 {
 157     if (!debug_matrix) return;
 158 #if (MATRIX_COLS <= 8)
 159     print("r/c 01234567\n");
 160 #else
 161     print("r/c 0123456789ABCDEF\n");
 162 #endif
 163     for (uint8_t row = 0; row < matrix_rows(); row++) {
 164         phex(row); print(": ");
 165 #if (MATRIX_COLS <= 8)
 166         pbin_reverse(matrix_get_row(row));
 167 #else
 168         pbin_reverse16(matrix_get_row(row));
 169 #endif
 170 #ifdef MATRIX_HAS_GHOST
 171         if (matrix_has_ghost_in_row(row)) {
 172             print(" <ghost");
 173         }
 174 #endif
 175         print("\n");
 176     }
 177 }
 178
 179 uint8_t matrix_key_count(void)
 180 {
 181     uint8_t count = 0;
 182     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 183 #if (MATRIX_COLS <= 8)
 184         count += bitpop(matrix[i]);
 185 #else
 186         count += bitpop16(matrix[i]);
 187 #endif
 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 inline
 210 static void register_key(uint8_t key)
 211 {
 212     uint8_t col, row;
 213     col = key&0x07;
 214     row = (key>>3)&0x0F;
 215     if (key&0x80) {
 216         matrix[row] &= ~(1<<col);
 217     } else {
 218         matrix[row] |=  (1<<col);
 219     }
 220     is_modified = true;
 221 }