summaryrefslogtreecommitdiffstats
path: root/keyboards/bpiphany/kitten_paw/matrix.c
blob: 56114858f153fae34b1849935f578868e4aff3e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*
  Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"

#ifndef DEBOUNCE
#   define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;

static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];

static uint8_t read_rows(void);
static void select_col(uint8_t col);

__attribute__ ((weak))
void matrix_init_kb(void) {
    matrix_init_user();
}

__attribute__ ((weak))
void matrix_scan_kb(void) {
    matrix_scan_user();
}

__attribute__ ((weak))
void matrix_init_user(void) {
}

__attribute__ ((weak))
void matrix_scan_user(void) {
}

inline uint8_t matrix_rows(void) {
  return MATRIX_ROWS;
}

inline uint8_t matrix_cols(void) {
  return MATRIX_COLS;
}

/* Column pin configuration
 *
 * col: 0    1    2    3    4    5    6    7
 * pin: PC7  PD5  PD3  PD1  PC2  PD6  PD4  PD2
 *
 * Rrr pin configuration
 *
 * These rrrs uses one 74HC154 4 to 16 bit demultiplexer (low
 * active), together with 2 rrrs driven directly from the micro
 * controller, to control the 18 rrrs. The rrrs are driven from
 * pins B6,5,4,3,2,1,0.
 */
void matrix_init(void) {
  DDRC  &= ~0b10000100;  // Row input pins
  DDRD  &= ~0b01111110;
  PORTC |=  0b10000100;
  PORTD |=  0b01111110;

  DDRB  |=  0b01111111;  // Column output pins

  for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
    matrix[i] = 0;
    matrix_debouncing[i] = 0;
  }
  matrix_init_quantum();
}

uint8_t matrix_scan(void) {
  for (uint8_t col = 0; col < MATRIX_COLS; col++) {
    select_col(col);
    _delay_us(3);
    uint8_t rows = read_rows();
    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
      bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
      bool curr_bit = rows & (1<<row);
      if (prev_bit != curr_bit) {
        matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
        debouncing = DEBOUNCE;
      }
    }
  }

  if (debouncing) {
    if (--debouncing) {
      _delay_ms(1);
    }
    else {
      for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        matrix[i] = matrix_debouncing[i];
      }
    }
  }
  matrix_scan_quantum();
  return 1;
}

inline bool matrix_is_on(uint8_t row, uint8_t col) {
  return (matrix[row] & ((matrix_row_t)1<<col));
}

inline matrix_row_t matrix_get_row(uint8_t row) {
  return matrix[row];
}

void matrix_print(void) {
  print("\nr/c 0123456789ABCDEF\n");
  for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
    xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
  }
}

uint8_t matrix_key_count(void) {
  uint8_t count = 0;
  for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
    count += bitpop32(matrix[i]);
  }
  return count;
}

static uint8_t read_rows(void) {
  return
    (PINC&(1<<7) ? 0 : (1<<0)) |
    (PIND&(1<<5) ? 0 : (1<<1)) |
    (PIND&(1<<3) ? 0 : (1<<2)) |
    (PIND&(1<<1) ? 0 : (1<<3)) |
    (PINC&(1<<2) ? 0 : (1<<4)) |
    (PIND&(1<<2) ? 0 : (1<<5)) |
    (PIND&(1<<4) ? 0 : (1<<6)) |
    (PIND&(1<<6) ? 0 : (1<<7));
}

static void select_col(uint8_t col) {
  switch (col) {
  case  0: PORTB = (PORTB & ~0b01111111) | 0b01100100; break;
  case  1: PORTB = (PORTB & ~0b01111111) | 0b01101100; break;
  case  2: PORTB = (PORTB & ~0b01111111) | 0b01100010; break;
  case  3: PORTB = (PORTB & ~0b01111111) | 0b01111010; break;
  case  4: PORTB = (PORTB & ~0b01111111) | 0b01100110; break;
  case  5: PORTB = (PORTB & ~0b01111111) | 0b01110110; break;
  case  6: PORTB = (PORTB & ~0b01111111) | 0b01101110; break;
  case  7: PORTB = (PORTB & ~0b01111111) | 0b01111110; break;
  case  8: PORTB = (PORTB & ~0b01111111) | 0b01000001; break;
  case  9: PORTB = (PORTB & ~0b01111111) | 0b00100001; break;
  case 10: PORTB = (PORTB & ~0b01111111) | 0b01101010; break;
  case 11: PORTB = (PORTB & ~0b01111111) | 0b01110010; break;
  case 12: PORTB = (PORTB & ~0b01111111) | 0b01111100; break;
  case 13: PORTB = (PORTB & ~0b01111111) | 0b01110100; break;
  case 14: PORTB = (PORTB & ~0b01111111) | 0b01111000; break;
  case 15: PORTB = (PORTB & ~0b01111111) | 0b01110000; break;
  case 16: PORTB = (PORTB & ~0b01111111) | 0b01100000; break;
  case 17: PORTB = (PORTB & ~0b01111111) | 0b01101000; break;
  }
}