7 #include <util/delay.h>
10 #include "matrix_skel.h"
13 // matrix state buffer (key on: 1/key off: 0)
14 static uint8_t *matrix;
15 static uint8_t *matrix_prev;
16 static uint8_t _matrix0[MATRIX_ROWS];
17 static uint8_t _matrix1[MATRIX_ROWS];
19 static bool matrix_has_ghost_in_row(uint8_t row);
20 static uint8_t read_col(void);
21 static void unselect_rows(void);
22 static void select_row(uint8_t row);
37 // this must be called once before matrix_scan.
38 void matrix_init(void)
40 // initialize row and col
42 // Input with pull-up(DDR:0, PORT:1)
46 // initialize matrix state: all keys off
47 for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
48 for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
50 matrix_prev = _matrix1;
61 for (int i = 0; i < MATRIX_ROWS; i++) {
64 _delay_us(30); // without this wait read unstable value.
65 matrix[i] = ~read_col();
71 bool matrix_is_modified(void)
73 for (int i = 0; i < MATRIX_ROWS; i++) {
74 if (matrix[i] != matrix_prev[i])
80 bool matrix_has_ghost(void)
82 for (int i = 0; i < MATRIX_ROWS; i++) {
83 if (matrix_has_ghost_in_row(i))
90 bool matrix_is_on(int row, int col)
92 return (matrix[row] & (1<<col));
96 uint16_t matrix_get_row(int row)
101 void matrix_print(void)
103 print("\nr/c 01234567\n");
104 for (int row = 0; row < matrix_rows(); row++) {
105 phex(row); print(": ");
106 pbin_reverse(matrix_get_row(row));
107 if (matrix_has_ghost_in_row(row)) {
114 int matrix_key_count(void)
117 for (int i = 0; i < MATRIX_ROWS; i++) {
118 count += bitpop(matrix[i]);
123 static bool matrix_has_ghost_in_row(uint8_t row)
125 // no ghost exists in case less than 2 keys on
126 if (((matrix[row] - 1) & matrix[row]) == 0)
129 // ghost exists in case same state as other row
130 for (int i=0; i < MATRIX_ROWS; i++) {
131 if (i != row && (matrix[i] & matrix[row]) == matrix[row])
137 static uint8_t read_col(void)
142 static void unselect_rows(void)
144 // Hi-Z(DDR:0, PORT:0) to unselect
145 DDRC &= ~0b11000000; // PC: 7,6
146 PORTC &= ~0b11000000;
147 DDRD &= ~0b11000111; // PD: 7,6,2,1,0
148 PORTD &= ~0b11000111;
149 DDRF &= ~0b11000000; // PF: 7,6
150 PORTF &= ~0b11000000;
153 static void select_row(uint8_t row)
155 // Output low(DDR:1, PORT:0) to select
156 // row: 0 1 2 3 4 5 6 7 8
157 // pin: PD0, PC7, PD7, PF6, PD6, PD1, PD2, PC6, PF7