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 static void matrix_clear(void);
  33
  34
  35 /*
  36  * Matrix Array usage:
  37  * IBM 4704 scan codes are assigned into 128(16x8)-cell matrix.
  38  *
  39  *    8bit wide
  40  *   +---------+
  41  *  0|         |
  42  *  :|   XX    | 00-7F
  43  *  f|         |
  44  *   +---------+
  45  *
  46  * Exceptions:
  47  */
  48 static uint8_t matrix[MATRIX_ROWS];
  49
  50 // scan code bits  7654 3210
  51 // R:row/C:column  -RRR RCCC
  52 #define ROW(code)      ((code>>3)&0x0f)
  53 #define COL(code)      (code&0x07)
  54
  55
  56 inline
  57 uint8_t matrix_rows(void)
  58 {
  59     return MATRIX_ROWS;
  60 }
  61
  62 inline
  63 uint8_t matrix_cols(void)
  64 {
  65     return MATRIX_COLS;
  66 }
  67
  68 static void enable_break(void)
  69 {
  70     print("Enable break: ");
  71     while (ibm4704_send(0xFC)) { _delay_ms(10); }
  72     // valid scancode: 00-79h
  73     for (uint8_t code = 0; code < 0x7F; code++) {
  74         while (ibm4704_send(0x80|code)) _delay_ms(10);
  75         _delay_ms(5);   // wait for response
  76         // No response(FF) when ok, FD when out of bound
  77         xprintf("s%02X:r%02X ", code, ibm4704_recv());
  78     }
  79     while (ibm4704_send(0xFF)) { _delay_ms(10); } // End
  80     print("End\n");
  81 }
  82
  83
  84 void matrix_setup(void)
  85 {
  86     ibm4704_init();
  87 }
  88
  89 void matrix_init(void)
  90 {
  91     debug_enable = true;
  92
  93     print("IBM 4704 converter\n");
  94     matrix_clear();
  95     _delay_ms(2000);    // wait for keyboard starting up
  96     xprintf("Keyboard ID: %02X\n", ibm4704_recv());
  97     enable_break();
  98 }
  99
 100 /*
 101  * IBM 4704 Scan Code
 102  */
 103 uint8_t matrix_scan(void)
 104 {
 105     uint8_t code = ibm4704_recv();
 106     if (code==0xFF) {
 107         // Not receivd
 108         return 0;
 109     } else if ((code&0x7F) >= 0x7A) {
 110         // 0xFF-FA and 0x7F-7A is not scancode
 111         xprintf("Error: %02X\n", code);
 112         matrix_clear();
 113         return 0;
 114     } else if (code&0x80) {
 115         dprintf("%02X\n", code);
 116         matrix_make(code);
 117     } else {
 118         dprintf("%02X\n", code);
 119         matrix_break(code);
 120     }
 121     return 1;
 122 }
 123
 124 inline
 125 bool matrix_is_on(uint8_t row, uint8_t col)
 126 {
 127     return (matrix[row] & (1<<col));
 128 }
 129
 130 inline
 131 uint8_t matrix_get_row(uint8_t row)
 132 {
 133     return matrix[row];
 134 }
 135
 136 void matrix_print(void)
 137 {
 138     print("\nr/c 01234567\n");
 139     for (uint8_t row = 0; row < matrix_rows(); row++) {
 140         xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
 141     }
 142 }
 143
 144
 145
 146 inline
 147 static void matrix_make(uint8_t code)
 148 {
 149     matrix[ROW(code)] |= 1<<COL(code);
 150 }
 151
 152 inline
 153 static void matrix_break(uint8_t code)
 154 {
 155     matrix[ROW(code)] &= ~(1<<COL(code));
 156 }
 157
 158 inline
 159 static void matrix_clear(void)
 160 {
 161     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 162 }