converter/x68k_usb/matrix.c

   1 /*
   2 Copyright 2012 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 "print.h"
  23 #include "util.h"
  24 #include "serial.h"
  25 #include "matrix.h"
  26 #include "debug.h"
  27
  28
  29 /*
  30  * Matrix Array usage:
  31  *
  32  * ROW: 16(4bits)
  33  * COL:  8(3bits)
  34  *
  35  *    8bit wide
  36  *   +---------+
  37  *  0|00 ... 07|
  38  *  1|08 ... 0F|
  39  *  :|   ...   |
  40  *  :|   ...   |
  41  *  E|70 ... 77|
  42  *  F|78 ... 7F|
  43  *   +---------+
  44  *
  45  */
  46 static uint8_t matrix[MATRIX_ROWS];
  47 #define ROW(code)      ((code>>3)&0xF)
  48 #define COL(code)      (code&0x07)
  49
  50 static bool is_modified = false;
  51
  52
  53 void matrix_init(void)
  54 {
  55     serial_init();
  56
  57     // initialize matrix state: all keys off
  58     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  59
  60     return;
  61 }
  62
  63 uint8_t matrix_scan(void)
  64 {
  65     is_modified = false;
  66
  67     uint16_t code;
  68     code = serial_recv2();
  69     if (code == -1) {
  70         return 0;
  71     }
  72
  73     dprintf("%02X\n", code);
  74     if (code&0x80) {
  75         // break code
  76         if (matrix_is_on(ROW(code), COL(code))) {
  77             matrix[ROW(code)] &= ~(1<<COL(code));
  78             is_modified = true;
  79         }
  80     } else {
  81         // make code
  82         if (!matrix_is_on(ROW(code), COL(code))) {
  83             matrix[ROW(code)] |=  (1<<COL(code));
  84             is_modified = true;
  85         }
  86     }
  87     return code;
  88 }
  89
  90 inline
  91 uint8_t matrix_get_row(uint8_t row)
  92 {
  93     return matrix[row];
  94 }