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     uint8_t ret;
  71     print("Enable break: ");
  72     // valid scancode: 00-79h
  73     for (uint8_t code = 0; code < 0x7A; code++) {
  74         while (ibm4704_send(0x80|code)) _delay_ms(1);
  75         // get none when ok, get FD when out of bound
  76         _delay_ms(5);
  77         if ((ret = ibm4704_recv()) != 0xff) {
  78             xprintf("c%02X:r%02X ", code, ret);
  79         }
  80         _delay_ms(1);
  81     }
  82     _delay_us(1000);
  83     while (ibm4704_send(0xFF)) { _delay_ms(1); } // End
  84     print("End\n");
  85 }
  86
  87 void matrix_init(void)
  88 {
  89     debug_enable = false;
  90
  91     ibm4704_init();
  92     matrix_clear();
  93
  94     _delay_ms(2000);    // wait for starting up debug console
  95
  96     print("IBM 4704 converter\n");
  97     while (ibm4704_send(0xFE)) _delay_ms(1);    // resend
  98     _delay_ms(5);
  99     xprintf("Keyboard ID: %02X\n", ibm4704_recv());
 100     enable_break();
 101 }
 102
 103 /*
 104  * IBM 4704 Scan Code
 105  */
 106 uint8_t matrix_scan(void)
 107 {
 108     uint8_t code = ibm4704_recv();
 109     if (code==0xFF) {
 110         // Not receivd
 111         return 0;
 112     } else if ((code&0x7F) >= 0x7A) {
 113         // 0xFF-FA and 0x7F-7A is not scancode
 114         xprintf("Error: %02X\n", code);
 115         matrix_clear();
 116         return 0;
 117     } else if (code&0x80) {
 118         dprintf("%02X\n", code);
 119         matrix_make(code);
 120     } else {
 121         dprintf("%02X\n", code);
 122         matrix_break(code);
 123     }
 124     return 1;
 125 }
 126
 127 inline
 128 bool matrix_is_on(uint8_t row, uint8_t col)
 129 {
 130     return (matrix[row] & (1<<col));
 131 }
 132
 133 inline
 134 uint8_t matrix_get_row(uint8_t row)
 135 {
 136     return matrix[row];
 137 }
 138
 139 void matrix_print(void)
 140 {
 141     print("\nr/c 01234567\n");
 142     for (uint8_t row = 0; row < matrix_rows(); row++) {
 143         xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
 144     }
 145 }
 146
 147
 148
 149 inline
 150 static void matrix_make(uint8_t code)
 151 {
 152     matrix[ROW(code)] |= 1<<COL(code);
 153 }
 154
 155 inline
 156 static void matrix_break(uint8_t code)
 157 {
 158     matrix[ROW(code)] &= ~(1<<COL(code));
 159 }
 160
 161 inline
 162 static void matrix_clear(void)
 163 {
 164     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 165 }