converter/sun_usb/matrix.c

   1 /*
   2 Copyright 2012 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 "matrix.h"
  25 #include "debug.h"
  26 #include "protocol/serial.h"
  27
  28
  29 /*
  30  * Matrix Array usage:
  31  *
  32  * ROW: 16(4bits)
  33  * COL:  8(3bits)
  34  *
  35  *    8bit wide
  36  *   +---------+
  37  *  0|00 ... 07|
  38  *  1|08 ... 0F|
  39  *  :|   ...   |
  40  *  :|   ...   |
  41  *  E|70 ... 77|
  42  *  F|78 ... 7F|
  43  *   +---------+
  44  */
  45 static uint8_t matrix[MATRIX_ROWS];
  46 #define ROW(code)      ((code>>3)&0xF)
  47 #define COL(code)      (code&0x07)
  48
  49 static bool is_modified = false;
  50
  51
  52 inline
  53 uint8_t matrix_rows(void)
  54 {
  55     return MATRIX_ROWS;
  56 }
  57
  58 inline
  59 uint8_t matrix_cols(void)
  60 {
  61     return MATRIX_COLS;
  62 }
  63
  64 void matrix_init(void)
  65 {
  66     print_enable = true;
  67     debug_enable = true;
  68
  69     serial_init();
  70
  71     // initialize matrix state: all keys off
  72     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  73
  74     return;
  75 }
  76
  77 uint8_t matrix_scan(void)
  78 {
  79     is_modified = false;
  80
  81     uint8_t code;
  82     code = serial_recv();
  83     if (!code) return 0;
  84
  85     debug_hex(code); debug(" ");
  86
  87     switch (code) {
  88         case 0x7E:  // reset fail
  89         case 0xFE:  // layout
  90         case 0xFF:  // reset success
  91             _delay_ms(500);
  92             // ignore response byte
  93             debug("(response ignored:");
  94             while ((code = serial_recv())) { debug(" "); debug_hex(code); }
  95             debug(") ");
  96             // FALL THROUGH
  97         case 0x7F:
  98             // all keys up
  99             for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 100             return 0;
 101     }
 102
 103     if (code&0x80) {
 104         // break code
 105         if (matrix_is_on(ROW(code), COL(code))) {
 106             matrix[ROW(code)] &= ~(1<<COL(code));
 107             is_modified = true;
 108         }
 109     } else {
 110         // make code
 111         if (!matrix_is_on(ROW(code), COL(code))) {
 112             matrix[ROW(code)] |=  (1<<COL(code));
 113             is_modified = true;
 114         }
 115     }
 116     return code;
 117 }
 118
 119 bool matrix_is_modified(void)
 120 {
 121     return is_modified;
 122 }
 123
 124 inline
 125 bool matrix_has_ghost(void)
 126 {
 127     return false;
 128 }
 129
 130 inline
 131 bool matrix_is_on(uint8_t row, uint8_t col)
 132 {
 133     return (matrix[row] & (1<<col));
 134 }
 135
 136 inline
 137 uint8_t matrix_get_row(uint8_t row)
 138 {
 139     return matrix[row];
 140 }
 141
 142 void matrix_print(void)
 143 {
 144     print("\nr/c 01234567\n");
 145     for (uint8_t row = 0; row < matrix_rows(); row++) {
 146         phex(row); print(": ");
 147         pbin_reverse(matrix_get_row(row));
 148         print("\n");
 149     }
 150 }
 151
 152 uint8_t matrix_key_count(void)
 153 {
 154     uint8_t count = 0;
 155     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 156         count += bitpop(matrix[i]);
 157     }
 158     return count;
 159 }