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1 | #include <avr/io.h> | |
2 | #include <avr/pgmspace.h> | |
3 | #include "matrix.h" | |
4 | #include "led.h" | |
5 | #include "wait.h" | |
6 | #include "debug.h" | |
7 | ||
8 | #define CLK_HI() (PORTD |= (1<<0)) | |
9 | #define CLK_LO() (PORTD &= ~(1<<0)) | |
10 | #define STATE() (PIND & (1<<1)) | |
11 | #define RST_HI() (PORTD |= (1<<3)) | |
12 | #define RST_LO() (PORTD &= ~(1<<3)) | |
13 | #define SENSE() (PIND & (1<<2)) | |
14 | ||
15 | static matrix_row_t matrix[8] = {}; | |
16 | ||
17 | ||
18 | void matrix_init(void) | |
19 | { | |
20 | debug_enable = true; | |
21 | debug_keyboard = true; | |
22 | debug_matrix = true; | |
23 | ||
24 | // PD0: Clock. Counter couts up at falling edge. | |
25 | // PD1: Key State. Hi if selected key is activated. | |
26 | // PD2: Sense. Lo if any key is activated while Reset is Hi. | |
27 | // PD3: Reset. Resets counters at riging edge. | |
28 | DDRD |= (1<<3) | (1<<0); // output | |
29 | DDRD &= ~((1<<2) | (1<<1)); // input | |
30 | PORTD &= ~((1<<3) | (1<<0)); // low | |
31 | PORTD |= (1<<2) | (1<<1); // pull-up | |
32 | ||
33 | dprintf("init\n"); | |
34 | } | |
35 | ||
36 | uint8_t matrix_scan(void) | |
37 | { | |
38 | // TODO: debouce & unplug detect | |
39 | // Reset counters | |
40 | RST_HI(); | |
41 | wait_us(10); | |
42 | RST_LO(); | |
43 | wait_us(10); | |
44 | ||
45 | // 8x8 matrix: row:sense, col:drive, key_on:hi | |
46 | for (uint8_t col = 0; col < 8; col++) { | |
47 | for (uint8_t row = 0; row < 8; row++) { | |
48 | CLK_HI(); | |
49 | wait_us(10); | |
50 | ||
51 | if (STATE()) { | |
52 | matrix[row] |= (1<<col); | |
53 | } else { | |
54 | matrix[row] &= ~(1<<col); | |
55 | } | |
56 | ||
57 | // proceed counter - next row | |
58 | CLK_LO(); | |
59 | wait_us(10); | |
60 | } | |
61 | } | |
62 | return 1; | |
63 | } | |
64 | ||
65 | matrix_row_t matrix_get_row(uint8_t row) | |
66 | { | |
67 | return matrix[row]; | |
68 | } | |
69 | ||
70 | void led_set(uint8_t usb_led) | |
71 | { | |
72 | } |