converter/pc98_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     //debug_matrix = true;
  69
  70     PC98_RST_DDR |= (1<<PC98_RST_BIT);
  71     PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
  72     PC98_RTY_DDR |= (1<<PC98_RTY_BIT);
  73     PC98_RST_PORT |= (1<<PC98_RST_BIT);
  74     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  75     PC98_RTY_PORT |= (1<<PC98_RTY_BIT);
  76
  77     DDRD |= 1<<7;
  78
  79
  80     serial_init();
  81
  82     // PC98 reset
  83     PC98_RST_PORT &= ~(1<<PC98_RST_BIT);
  84     _delay_us(15);
  85     PC98_RST_PORT |= (1<<PC98_RST_BIT);
  86     _delay_us(13);
  87     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  88
  89     // PC98 ready
  90     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
  91
  92     // initialize matrix state: all keys off
  93     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  94
  95     debug("init\n");
  96     return;
  97 }
  98
  99 uint8_t matrix_scan(void)
 100 {
 101     is_modified = false;
 102
 103     uint16_t code;
 104     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
 105     _delay_us(30);
 106     code = serial_recv2();
 107     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
 108     if (code == -1) return 0;
 109
 110     debug_hex(code); debug(" ");
 111
 112     if (code&0x80) {
 113         // break code
 114         if (matrix_is_on(ROW(code), COL(code))) {
 115             matrix[ROW(code)] &= ~(1<<COL(code));
 116             is_modified = true;
 117         }
 118     } else {
 119         // make code
 120         if (!matrix_is_on(ROW(code), COL(code))) {
 121             matrix[ROW(code)] |=  (1<<COL(code));
 122             is_modified = true;
 123         }
 124     }
 125     return code;
 126 }
 127
 128 bool matrix_is_modified(void)
 129 {
 130     return is_modified;
 131 }
 132
 133 inline
 134 bool matrix_has_ghost(void)
 135 {
 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 uint8_t matrix_get_row(uint8_t row)
 147 {
 148     return matrix[row];
 149 }
 150
 151 void matrix_print(void)
 152 {
 153     print("\nr/c 01234567\n");
 154     for (uint8_t row = 0; row < matrix_rows(); row++) {
 155         phex(row); print(": ");
 156         pbin_reverse(matrix_get_row(row));
 157         print("\n");
 158     }
 159 }
 160
 161 uint8_t matrix_key_count(void)
 162 {
 163     uint8_t count = 0;
 164     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 165         count += bitpop(matrix[i]);
 166     }
 167     return count;
 168 }