converter/m0110_usb/matrix.c

   1 /*
   2 Copyright 2011,2012 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 /*
  19  * scan matrix
  20  */
  21 #include <stdint.h>
  22 #include <stdbool.h>
  23 #include <avr/io.h>
  24 #include <util/delay.h>
  25 #include "print.h"
  26 #include "util.h"
  27 #include "debug.h"
  28 #include "host.h"
  29 #include "led.h"
  30 #include "m0110.h"
  31 #include "matrix.h"
  32
  33
  34 #define CAPS        0x39
  35 #define CAPS_BREAK  (CAPS | 0x80)
  36 #define ROW(key)    ((key)>>3&0x0F)
  37 #define COL(key)    ((key)&0x07)
  38
  39
  40 static bool is_modified = false;
  41
  42 // matrix state buffer(1:on, 0:off)
  43 static uint8_t *matrix;
  44 static uint8_t _matrix0[MATRIX_ROWS];
  45
  46 static void register_key(uint8_t key);
  47
  48
  49 void matrix_init(void)
  50 {
  51     m0110_init();
  52     // initialize matrix state: all keys off
  53     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
  54     matrix = _matrix0;
  55
  56     // LED flash
  57     DDRD |= (1<<6); PORTD |= (1<<6);
  58     _delay_ms(500);
  59     DDRD |= (1<<6); PORTD &= ~(1<<6);
  60
  61     return;
  62 }
  63
  64 uint8_t matrix_scan(void)
  65 {
  66     uint8_t key;
  67
  68     is_modified = false;
  69     key = m0110_recv_key();
  70
  71     if (key == M0110_NULL) {
  72         return 0;
  73     } else if (key == M0110_ERROR) {
  74         return 0;
  75     } else {
  76         is_modified = true;
  77         register_key(key);
  78     }
  79
  80     if (debug_enable) {
  81         print("["); phex(key); print("]\n");
  82     }
  83     return 1;
  84 }
  85
  86 inline
  87 uint8_t matrix_get_row(uint8_t row)
  88 {
  89     return matrix[row];
  90 }
  91
  92 inline
  93 static void register_key(uint8_t key)
  94 {
  95     if (key&0x80) {
  96         matrix[ROW(key)] &= ~(1<<COL(key));
  97     } else {
  98         matrix[ROW(key)] |=  (1<<COL(key));
  99     }
 100 }