converter/ibm4704_usb/matrix.c

   1 /*
   2 Copyright 2014 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 "action.h"
  23 #include "print.h"
  24 #include "debug.h"
  25 #include "util.h"
  26 #include "ibm4704.h"
  27 #include "matrix.h"
  28
  29
  30 static void matrix_make(uint8_t code);
  31 static void matrix_break(uint8_t code);
  32
  33
  34 /*
  35  * Matrix Array usage:
  36  * IBM 4704 scan codes are assigned into 128(16x8)-cell matrix.
  37  *
  38  *    8bit wide
  39  *   +---------+
  40  *  0|         |
  41  *  :|   XX    | 00-7F
  42  *  f|         |
  43  *   +---------+
  44  *
  45  * Exceptions:
  46  */
  47 static uint8_t matrix[MATRIX_ROWS];
  48
  49 // scan code bits  7654 3210
  50 // R:row/C:column  -RRR RCCC
  51 #define ROW(code)      ((code>>3)&0x0f)
  52 #define COL(code)      (code&0x07)
  53
  54
  55 static void enable_break(void)
  56 {
  57     print("Enable break: ");
  58     while (ibm4704_send(0xFC)) { _delay_ms(10); }
  59     // valid scancode: 00-79h
  60     for (uint8_t code = 0; code < 0x7F; code++) {
  61         while (ibm4704_send(0x80|code)) _delay_ms(10);
  62         _delay_ms(5);   // wait for response
  63         // No response(FF) when ok, FD when out of bound
  64         xprintf("s%02X:r%02X ", code, ibm4704_recv());
  65     }
  66     while (ibm4704_send(0xFF)) { _delay_ms(10); } // End
  67     print("End\n");
  68 }
  69
  70
  71 void matrix_setup(void)
  72 {
  73     ibm4704_init();
  74 }
  75
  76 void matrix_init(void)
  77 {
  78     debug_enable = true;
  79
  80     print("IBM 4704 converter\n");
  81     matrix_clear();
  82     _delay_ms(2000);    // wait for keyboard starting up
  83     xprintf("Keyboard ID: %02X\n", ibm4704_recv());
  84     enable_break();
  85 }
  86
  87 /*
  88  * IBM 4704 Scan Code
  89  */
  90 uint8_t matrix_scan(void)
  91 {
  92     uint8_t code = ibm4704_recv();
  93     if (code==0xFF) {
  94         // Not receivd
  95         return 0;
  96     } else if ((code&0x7F) >= 0x7C) {
  97         // 0xFF-FC and 0x7F-7C is not scancode
  98         xprintf("Error: %02X\n", code);
  99         matrix_clear();
 100         return 0;
 101     } else if (code&0x80) {
 102         dprintf("%02X\n", code);
 103         matrix_make(code);
 104     } else {
 105         dprintf("%02X\n", code);
 106         matrix_break(code);
 107     }
 108     return 1;
 109 }
 110
 111 inline
 112 uint8_t matrix_get_row(uint8_t row)
 113 {
 114     return matrix[row];
 115 }
 116
 117 inline
 118 static void matrix_make(uint8_t code)
 119 {
 120     matrix[ROW(code)] |= 1<<COL(code);
 121 }
 122
 123 inline
 124 static void matrix_break(uint8_t code)
 125 {
 126     matrix[ROW(code)] &= ~(1<<COL(code));
 127 }
 128
 129 void matrix_clear(void)
 130 {
 131     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 132 }