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: 00-77h
  73     for (uint8_t code = 0; code < 0x78; code++) {
  74         while (ibm4704_send(0x80|code) != 0) {
  75             print("z");
  76             _delay_us(500);
  77         }
  78         _delay_us(2000);
  79         ret = ibm4704_recv();
  80         if (ret != 0xff) {
  81             xprintf("c%02X:r%02X ", code, ret);
  82         }
  83         _delay_us(1000);
  84     }
  85     _delay_us(1000);
  86     while (ibm4704_send(0xFF) != 0) { _delay_us(500); } // End
  87     print("End\n");
  88 }
  89
  90 void matrix_init(void)
  91 {
  92     uint8_t ret;
  93     debug_enable = true;
  94
  95     ibm4704_init();
  96     matrix_clear();
  97
  98     // read keyboard id
  99     while ((ret = ibm4704_recv()) == 0xFF) {
 100         ibm4704_send(0xFE);
 101         _delay_us(100);
 102     }
 103
 104     _delay_ms(2000);    // wait for starting up debug console
 105     print("IBM 4704 converter\n");
 106     xprintf("Keyboard ID: %02X\n", ret);
 107     enable_break();
 108 }
 109
 110 /*
 111  * IBM 4704 Scan Code
 112  */
 113 uint8_t matrix_scan(void)
 114 {
 115     uint8_t code = ibm4704_recv();
 116     if (code==0xFF) {
 117         // Not receivd
 118         return 0;
 119     } else if ((code&0x78)==0x78) {
 120         // 0xFF-F8 and 0x7F-78 is not scancode
 121         xprintf("Error: %0X\n", code);
 122         matrix_clear();
 123         return 0;
 124     } else if (code&0x80) {
 125         matrix_make(code);
 126     } else {
 127         matrix_break(code);
 128     }
 129     return 1;
 130 }
 131
 132 inline
 133 bool matrix_is_on(uint8_t row, uint8_t col)
 134 {
 135     return (matrix[row] & (1<<col));
 136 }
 137
 138 inline
 139 uint8_t matrix_get_row(uint8_t row)
 140 {
 141     return matrix[row];
 142 }
 143
 144 void matrix_print(void)
 145 {
 146     print("\nr/c 01234567\n");
 147     for (uint8_t row = 0; row < matrix_rows(); row++) {
 148         xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
 149     }
 150 }
 151
 152
 153
 154 inline
 155 static void matrix_make(uint8_t code)
 156 {
 157     matrix[ROW(code)] |= 1<<COL(code);
 158 }
 159
 160 inline
 161 static void matrix_break(uint8_t code)
 162 {
 163     matrix[ROW(code)] &= ~(1<<COL(code));
 164 }
 165
 166 inline
 167 static void matrix_clear(void)
 168 {
 169     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 170 }