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
|
/*
* scan matrix
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "util.h"
#include "controller.h"
#include "matrix_skel.h"
// matrix is active low. (key on: 0/key off: 1)
//
// HHKB has no ghost and no bounce.
// row: HC4051 select input channel(0-8)
// PB0, PB1, PB2(A, B, C)
// col: LS145 select low output line(0-8)
// PB3, PB4, PB5, PB6(A, B, C, D)
// use D as ENABLE: (enable: 0/unenable: 1)
// key: KEY: (on: 0/ off:1)
// KEY_PREV: (on: 1/ off: 0)
// PE6,PE7(KEY, KEY_PREV)
#define COL_ENABLE (1<<6)
#define KEY_SELELCT(ROW, COL) (PORTB = COL_ENABLE|(((COL)&0x07)<<3)|((ROW)&0x07))
#define KEY_ENABLE (PORTB &= ~COL_ENABLE)
#define KEY_UNABLE (PORTB |= COL_ENABLE)
#define KEY_STATE (PINE&(1<<6))
#define KEY_PREV_ON (PORTE |= (1<<7))
#define KEY_PREV_OFF (PORTE &= ~(1<<7))
// matrix state buffer
static uint8_t *matrix;
static uint8_t *matrix_prev;
static uint8_t _matrix0[MATRIX_ROWS];
static uint8_t _matrix1[MATRIX_ROWS];
inline
int matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
int matrix_cols(void)
{
return MATRIX_COLS;
}
// this must be called once before matrix_scan.
void matrix_init(void)
{
// row & col output(PB0-6)
DDRB = 0xFF;
PORTB = KEY_SELELCT(0, 0);
// KEY: input with pullup(PE6)
// KEY_PREV: output(PE7)
DDRE = 0xBF;
PORTE = 0x40;
// initialize matrix state: all keys off
for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
matrix = _matrix0;
matrix_prev = _matrix1;
}
int matrix_scan(void)
{
uint8_t *tmp;
tmp = matrix_prev;
matrix_prev = matrix;
matrix = tmp;
for (int row = 0; row < MATRIX_ROWS; row++) {
for (int col = 0; col < MATRIX_COLS; col++) {
KEY_SELELCT(row, col);
_delay_us(40); // from logic analyzer chart
if (matrix_prev[row] & (1<<col)) {
KEY_PREV_ON;
}
_delay_us(7); // from logic analyzer chart
KEY_ENABLE;
_delay_us(10); // from logic analyzer chart
if (KEY_STATE) {
matrix[row] &= ~(1<<col);
} else {
matrix[row] |= (1<<col);
}
KEY_PREV_OFF;
KEY_UNABLE;
_delay_us(150); // from logic analyzer chart
}
}
return 1;
}
bool matrix_is_modified(void)
{
for (int i = 0; i < MATRIX_ROWS; i++) {
if (matrix[i] != matrix_prev[i])
return true;
}
return false;
}
inline
bool matrix_has_ghost(void)
{
return false;
}
inline
bool matrix_is_on(int row, int col)
{
return (matrix[row] & (1<<col));
}
inline
uint16_t matrix_get_row(int row)
{
return matrix[row];
}
void matrix_print(void)
{
print("\nr/c 01234567\n");
for (int row = 0; row < matrix_rows(); row++) {
phex(row); print(": ");
pbin_reverse(matrix_get_row(row));
print("\n");
}
}
int matrix_key_count(void)
{
int count = 0;
for (int i = 0; i < MATRIX_ROWS; i++) {
count += bitpop(matrix[i]);
}
return count;
}
|
