blob: b50427ac04f779cd63ddb4293f334355fcf68cff (
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
177
178
179
180
181
|
/*
* scan matrix
*/
#include <avr/io.h>
#include <util/delay.h>
#include "keymap.h"
#include "matrix.h"
// matrix is active low. (key on: 0/key off: 1)
// row: Hi-Z(unselected)/low output(selected)
// PD:0,1,2,3,6,7/PC:6,7/PF:7
// col: input w/pullup
// PB:0-8
// matrix state buffer
uint8_t *matrix;
uint8_t *matrix_prev;
static uint8_t _matrix0[MATRIX_ROWS];
static uint8_t _matrix1[MATRIX_ROWS];
static uint8_t read_col(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
// this must be called once before matrix_scan.
void matrix_init(void)
{
// initialize row and col
unselect_rows();
DDRB = 0x00;
PORTB = 0xFF;
// initialize matrix state: all keys off
for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0xFF;
for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0xFF;
matrix = _matrix0;
matrix_prev = _matrix1;
}
uint8_t matrix_scan(void)
{
uint8_t row, state;
uint8_t *tmp;
tmp = matrix_prev;
matrix_prev = matrix;
matrix = tmp;
for (row = 0; row < MATRIX_ROWS; row++) {
select_row(row);
_delay_us(30); // without this wait read unstable value.
state = read_col();
unselect_rows();
matrix[row] = state;
}
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;
}
bool matrix_has_ghost(void) {
for (int i=0; i <MATRIX_ROWS; i++) {
if (matrix_has_ghost_in_row(i))
return true;
}
return false;
}
bool matrix_has_ghost_in_row(uint8_t row) {
uint8_t state = ~matrix[row];
// no ghost exists in case less than 2 keys on
if (((state - 1) & state) == 0)
return false;
// ghost exists in case same state as other row
for (int i=0; i < MATRIX_ROWS; i++) {
if (i == row) continue;
if ((~matrix[i] & state) == state) return true;
}
return false;
}
static uint8_t read_col(void)
{
return PINB;
}
static void unselect_rows(void) {
DDRD = 0x00;
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
}
static void select_row(uint8_t row)
{
switch (row) {
case 0:
DDRD = (1<<0);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 1:
DDRD = (1<<1);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 2:
DDRD = (1<<2);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 3:
DDRD = (1<<3);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 4:
DDRD = (1<<6);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 5:
DDRD = (1<<7);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 6:
DDRD = 0x00;
PORTD = 0x00;
DDRC = (1<<6);
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 7:
DDRD = 0x00;
PORTD = 0x00;
DDRC = (1<<7);
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 8:
DDRD = 0x00;
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
DDRF = (1<<7);
PORTF = 0x00;
break;
}
}
|
