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
  50 static void pc98_inhibit_repeat(void)
  51 {
  52     uint8_t code;
  53
  54     while (serial_recv()) ;
  55 RETRY:
  56     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  57     _delay_ms(500);
  58     serial_send(0x9C);
  59
  60     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
  61     _delay_ms(100);
  62     while (!(code = serial_recv())) ;
  63     print("PC98: send 9C: "); print_hex8(code); print("\n");
  64     if (code != 0xFA) goto RETRY;
  65
  66
  67
  68     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  69     _delay_ms(100);
  70     serial_send(0x70);
  71
  72     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
  73     _delay_ms(100);
  74     //code = serial_recv();
  75     while (!(code = serial_recv())) ;
  76     print("PC98: send 70: "); print_hex8(code); print("\n");
  77     if (code != 0xFA) goto RETRY;
  78 }
  79
  80 void matrix_init(void)
  81 {
  82     PC98_RST_DDR |= (1<<PC98_RST_BIT);
  83     PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
  84     PC98_RTY_DDR |= (1<<PC98_RTY_BIT);
  85     PC98_RST_PORT |= (1<<PC98_RST_BIT);
  86     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  87     PC98_RTY_PORT |= (1<<PC98_RTY_BIT);
  88
  89
  90     serial_init();
  91
  92     // PC98 reset
  93 /*
  94     PC98_RST_PORT &= ~(1<<PC98_RST_BIT);
  95     _delay_us(15);
  96     PC98_RST_PORT |= (1<<PC98_RST_BIT);
  97     _delay_us(13);
  98     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
  99 */
 100
 101     _delay_ms(500);
 102     pc98_inhibit_repeat();
 103
 104
 105     // PC98 ready
 106     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
 107
 108     // initialize matrix state: all keys off
 109     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 110
 111     debug("init\n");
 112     return;
 113 }
 114
 115 uint8_t matrix_scan(void)
 116 {
 117     uint16_t code;
 118     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
 119     _delay_us(30);
 120     code = serial_recv2();
 121     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
 122     if (code == -1) return 0;
 123
 124 if (code == 0x60) {
 125     pc98_inhibit_repeat();
 126
 127 /*
 128     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
 129     _delay_ms(100);
 130     serial_send(0x96);
 131     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
 132 */
 133
 134     return 0;
 135 }
 136
 137     print_hex8(code); print(" ");
 138
 139     if (code&0x80) {
 140         // break code
 141         if (matrix_is_on(ROW(code), COL(code))) {
 142             matrix[ROW(code)] &= ~(1<<COL(code));
 143         }
 144     } else {
 145         // make code
 146         if (!matrix_is_on(ROW(code), COL(code))) {
 147             matrix[ROW(code)] |=  (1<<COL(code));
 148         }
 149     }
 150     return code;
 151 }
 152
 153 inline
 154 uint8_t matrix_get_row(uint8_t row)
 155 {
 156     return matrix[row];
 157 }