2 Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 static pin_t direct_pins
[MATRIX_ROWS
][MATRIX_COLS
] = DIRECT_PINS
;
27 #elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
28 static const pin_t row_pins
[MATRIX_ROWS
] = MATRIX_ROW_PINS
;
29 static const pin_t col_pins
[MATRIX_COLS
] = MATRIX_COL_PINS
;
32 /* matrix state(1:on, 0:off) */
33 extern matrix_row_t raw_matrix
[MATRIX_ROWS
]; // raw values
34 extern matrix_row_t matrix
[MATRIX_ROWS
]; // debounced values
40 static void init_pins(void) {
41 for (int row
= 0; row
< MATRIX_ROWS
; row
++) {
42 for (int col
= 0; col
< MATRIX_COLS
; col
++) {
43 pin_t pin
= direct_pins
[row
][col
];
51 static bool read_cols_on_row(matrix_row_t current_matrix
[], uint8_t current_row
) {
52 matrix_row_t last_row_value
= current_matrix
[current_row
];
53 current_matrix
[current_row
] = 0;
55 for (uint8_t col_index
= 0; col_index
< MATRIX_COLS
; col_index
++) {
56 pin_t pin
= direct_pins
[current_row
][col_index
];
58 current_matrix
[current_row
] |= readPin(pin
) ? 0 : (MATRIX_ROW_SHIFTER
<< col_index
);
62 return (last_row_value
!= current_matrix
[current_row
]);
65 #elif defined(DIODE_DIRECTION)
66 # if (DIODE_DIRECTION == COL2ROW)
68 static void select_row(uint8_t row
) {
69 setPinOutput(row_pins
[row
]);
70 writePinLow(row_pins
[row
]);
73 static void unselect_row(uint8_t row
) { setPinInputHigh(row_pins
[row
]); }
75 static void unselect_rows(void) {
76 for (uint8_t x
= 0; x
< MATRIX_ROWS
; x
++) {
77 setPinInputHigh(row_pins
[x
]);
81 static void init_pins(void) {
83 for (uint8_t x
= 0; x
< MATRIX_COLS
; x
++) {
84 setPinInputHigh(col_pins
[x
]);
88 static bool read_cols_on_row(matrix_row_t current_matrix
[], uint8_t current_row
) {
89 // Store last value of row prior to reading
90 matrix_row_t last_row_value
= current_matrix
[current_row
];
92 // Clear data in matrix row
93 current_matrix
[current_row
] = 0;
95 // Select row and wait for row selecton to stabilize
96 select_row(current_row
);
100 for (uint8_t col_index
= 0; col_index
< MATRIX_COLS
; col_index
++) {
101 // Select the col pin to read (active low)
102 uint8_t pin_state
= readPin(col_pins
[col_index
]);
104 // Populate the matrix row with the state of the col pin
105 current_matrix
[current_row
] |= pin_state
? 0 : (MATRIX_ROW_SHIFTER
<< col_index
);
109 unselect_row(current_row
);
111 return (last_row_value
!= current_matrix
[current_row
]);
114 # elif (DIODE_DIRECTION == ROW2COL)
116 static void select_col(uint8_t col
) {
117 setPinOutput(col_pins
[col
]);
118 writePinLow(col_pins
[col
]);
121 static void unselect_col(uint8_t col
) { setPinInputHigh(col_pins
[col
]); }
123 static void unselect_cols(void) {
124 for (uint8_t x
= 0; x
< MATRIX_COLS
; x
++) {
125 setPinInputHigh(col_pins
[x
]);
129 static void init_pins(void) {
131 for (uint8_t x
= 0; x
< MATRIX_ROWS
; x
++) {
132 setPinInputHigh(row_pins
[x
]);
136 static bool read_rows_on_col(matrix_row_t current_matrix
[], uint8_t current_col
) {
137 bool matrix_changed
= false;
139 // Select col and wait for col selecton to stabilize
140 select_col(current_col
);
144 for (uint8_t row_index
= 0; row_index
< MATRIX_ROWS
; row_index
++) {
145 // Store last value of row prior to reading
146 matrix_row_t last_row_value
= current_matrix
[row_index
];
148 // Check row pin state
149 if (readPin(row_pins
[row_index
]) == 0) {
150 // Pin LO, set col bit
151 current_matrix
[row_index
] |= (MATRIX_ROW_SHIFTER
<< current_col
);
153 // Pin HI, clear col bit
154 current_matrix
[row_index
] &= ~(MATRIX_ROW_SHIFTER
<< current_col
);
157 // Determine if the matrix changed state
158 if ((last_row_value
!= current_matrix
[row_index
]) && !(matrix_changed
)) {
159 matrix_changed
= true;
164 unselect_col(current_col
);
166 return matrix_changed
;
170 # error DIODE_DIRECTION must be one of COL2ROW or ROW2COL!
173 # error DIODE_DIRECTION is not defined!
176 void matrix_init(void) {
177 // initialize key pins
180 // initialize matrix state: all keys off
181 for (uint8_t i
= 0; i
< MATRIX_ROWS
; i
++) {
186 debounce_init(MATRIX_ROWS
);
188 matrix_init_quantum();
191 uint8_t matrix_scan(void) {
192 bool changed
= false;
194 #if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
195 // Set row, read cols
196 for (uint8_t current_row
= 0; current_row
< MATRIX_ROWS
; current_row
++) {
197 changed
|= read_cols_on_row(raw_matrix
, current_row
);
199 #elif (DIODE_DIRECTION == ROW2COL)
200 // Set col, read rows
201 for (uint8_t current_col
= 0; current_col
< MATRIX_COLS
; current_col
++) {
202 changed
|= read_rows_on_col(raw_matrix
, current_col
);
206 debounce(raw_matrix
, matrix
, MATRIX_ROWS
, changed
);
208 matrix_scan_quantum();
209 return (uint8_t)changed
;