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     DDRD |= (1<<6);
  67     PORTD |= (1<<6);
  68     debug_enable = true;
  69
  70     serial_init();
  71
  72     // initialize matrix state: all keys off
  73     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  74
  75     return;
  76 }
  77
  78 uint8_t matrix_scan(void)
  79 {
  80     is_modified = false;
  81
  82     uint8_t code;
  83     code = serial_recv();
  84     if (!code) return 0;
  85
  86     debug_hex(code); debug(" ");
  87
  88     switch (code) {
  89         case 0x7E:  // reset fail
  90         case 0xFE:  // layout
  91         case 0xFF:  // reset success
  92             _delay_ms(500);
  93             // ignore response byte
  94             debug("(response ignored:");
  95             while ((code = serial_recv())) { debug(" "); debug_hex(code); }
  96             debug(") ");
  97             // FALL THROUGH
  98         case 0x7F:
  99             // all keys up
 100             for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 101             return 0;
 102     }
 103
 104     if (code&0x80) {
 105         // break code
 106         if (matrix_is_on(ROW(code), COL(code))) {
 107             matrix[ROW(code)] &= ~(1<<COL(code));
 108             is_modified = true;
 109         }
 110     } else {
 111         // make code
 112         if (!matrix_is_on(ROW(code), COL(code))) {
 113             matrix[ROW(code)] |=  (1<<COL(code));
 114             is_modified = true;
 115         }
 116     }
 117     return code;
 118 }
 119
 120 bool matrix_is_modified(void)
 121 {
 122     return is_modified;
 123 }
 124
 125 inline
 126 bool matrix_has_ghost(void)
 127 {
 128     return false;
 129 }
 130
 131 inline
 132 bool matrix_is_on(uint8_t row, uint8_t col)
 133 {
 134     return (matrix[row] & (1<<col));
 135 }
 136
 137 inline
 138 uint8_t matrix_get_row(uint8_t row)
 139 {
 140     return matrix[row];
 141 }
 142
 143 void matrix_print(void)
 144 {
 145     print("\nr/c 01234567\n");
 146     for (uint8_t row = 0; row < matrix_rows(); row++) {
 147         phex(row); print(": ");
 148         pbin_reverse(matrix_get_row(row));
 149         print("\n");
 150     }
 151 }
 152
 153 uint8_t matrix_key_count(void)
 154 {
 155     uint8_t count = 0;
 156     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 157         count += bitpop(matrix[i]);
 158     }
 159     return count;
 160 }