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 inline
  56 uint8_t matrix_rows(void)
  57 {
  58     return MATRIX_ROWS;
  59 }
  60
  61 inline
  62 uint8_t matrix_cols(void)
  63 {
  64     return MATRIX_COLS;
  65 }
  66
  67 static void enable_break(void)
  68 {
  69     print("Enable break: ");
  70     while (ibm4704_send(0xFC)) { _delay_ms(10); }
  71     // valid scancode: 00-79h
  72     for (uint8_t code = 0; code < 0x7F; code++) {
  73         while (ibm4704_send(0x80|code)) _delay_ms(10);
  74         _delay_ms(5);   // wait for response
  75         // No response(FF) when ok, FD when out of bound
  76         xprintf("s%02X:r%02X ", code, ibm4704_recv());
  77     }
  78     while (ibm4704_send(0xFF)) { _delay_ms(10); } // End
  79     print("End\n");
  80 }
  81
  82
  83 void matrix_setup(void)
  84 {
  85     ibm4704_init();
  86 }
  87
  88 void matrix_init(void)
  89 {
  90     debug_enable = true;
  91
  92     print("IBM 4704 converter\n");
  93     matrix_clear();
  94     _delay_ms(2000);    // wait for keyboard starting up
  95     xprintf("Keyboard ID: %02X\n", ibm4704_recv());
  96     enable_break();
  97 }
  98
  99 /*
 100  * IBM 4704 Scan Code
 101  */
 102 uint8_t matrix_scan(void)
 103 {
 104     uint8_t code = ibm4704_recv();
 105     if (code==0xFF) {
 106         // Not receivd
 107         return 0;
 108     } else if ((code&0x7F) >= 0x7C) {
 109         // 0xFF-FC and 0x7F-7C is not scancode
 110         xprintf("Error: %02X\n", code);
 111         matrix_clear();
 112         return 0;
 113     } else if (code&0x80) {
 114         dprintf("%02X\n", code);
 115         matrix_make(code);
 116     } else {
 117         dprintf("%02X\n", code);
 118         matrix_break(code);
 119     }
 120     return 1;
 121 }
 122
 123 inline
 124 bool matrix_is_on(uint8_t row, uint8_t col)
 125 {
 126     return (matrix[row] & (1<<col));
 127 }
 128
 129 inline
 130 uint8_t matrix_get_row(uint8_t row)
 131 {
 132     return matrix[row];
 133 }
 134
 135 void matrix_print(void)
 136 {
 137     print("\nr/c 01234567\n");
 138     for (uint8_t row = 0; row < matrix_rows(); row++) {
 139         xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
 140     }
 141 }
 142
 143
 144
 145 inline
 146 static void matrix_make(uint8_t code)
 147 {
 148     matrix[ROW(code)] |= 1<<COL(code);
 149 }
 150
 151 inline
 152 static void matrix_break(uint8_t code)
 153 {
 154     matrix[ROW(code)] &= ~(1<<COL(code));
 155 }
 156
 157 void matrix_clear(void)
 158 {
 159     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 160 }