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/*
Copyright 2017-2019 Mathias Andersson <wraul@dbox.se>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
#if (MATRIX_COLS <= 8)
# define print_matrix_header() print("\nr/c 01234567\n")
# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
# define ROW_SHIFTER ((uint8_t)1)
#elif (MATRIX_COLS <= 16)
# define print_matrix_header() print("\nr/c 0123456789ABCDEF\n")
# define print_matrix_row(row) print_bin_reverse16(matrix_get_row(row))
# define ROW_SHIFTER ((uint16_t)1)
#elif (MATRIX_COLS <= 32)
# define print_matrix_header() print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
# define print_matrix_row(row) print_bin_reverse32(matrix_get_row(row))
# define ROW_SHIFTER ((uint32_t)1)
#endif
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
/* matrix state(1:on, 0:off) */
static matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
static matrix_row_t matrix[MATRIX_ROWS]; // debounced values
__attribute__((weak)) void matrix_init_quantum(void) { matrix_init_kb(); }
__attribute__((weak)) void matrix_scan_quantum(void) { matrix_scan_kb(); }
__attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
__attribute__((weak)) void matrix_init_user(void) {}
__attribute__((weak)) void matrix_scan_user(void) {}
inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }
inline uint8_t matrix_cols(void) { return MATRIX_COLS; }
inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
void matrix_print(void) {
print_matrix_header();
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
print_hex8(row);
print(": ");
print_matrix_row(row);
print("\n");
}
}
/* Columns 0 - 15
* These columns uses two 74HC237D 3 to 8 bit demultiplexers.
* col / pin: PB6 PC6 PC7 PF1 PF0
* 0: 0 1 0 0 0
* 1: 0 1 0 0 1
* 2: 0 1 0 1 0
* 3: 0 1 0 1 1
* 4: 0 1 1 0 0
* 5: 0 1 1 0 1
* 6: 0 1 1 1 0
* 7: 0 1 1 1 1
* 8: 1 0 0 0 0
* 9: 1 0 0 0 1
* 10: 1 0 0 1 0
* 11: 1 0 0 1 1
* 12: 1 0 1 0 0
* 13: 1 0 1 0 1
* 14: 1 0 1 1 0
* 15: 1 0 1 1 1
*
* col: 16
* pin: PB5
*/
static void unselect_cols(void) {
for (uint8_t x = 0; x < 6; x++) {
setPinOutput(col_pins[x]);
writePinLow(col_pins[x]);
}
}
static void select_col(uint8_t col) {
if (col < 16) {
uint8_t c = col + 8;
writePin(B6, c & 0b10000);
writePin(C6, c & 0b01000);
writePin(C7, c & 0b00100);
writePin(F1, c & 0b00010);
writePin(F0, c & 0b00001);
} else {
writePinHigh(B5);
}
}
/* Row pin configuration
* row: 0 1 2 3 4 5
* pin: D0 D1 D2 D3 D5 B7
*
* Caps lock uses its own pin E2
*/
static void init_pins(void) {
unselect_cols();
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
setPinInputHigh(row_pins[x]);
}
setPinInputHigh(E2);
}
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
bool matrix_changed = false;
// Select col and wait for col selecton to stabilize
select_col(current_col);
wait_us(30);
// For each row...
for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
// Store last value of row prior to reading
matrix_row_t last_row_value = current_matrix[row_index];
// Check row pin state
// Use the otherwise unused row: 3, col: 0 for caps lock
if (row_index == 3 && current_col == 0) {
if (readPin(E2) == 0) {
// Pin LO, set col bit
current_matrix[row_index] |= (ROW_SHIFTER << current_col);
} else {
// Pin HI, clear col bit
current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
}
} else {
if (readPin(row_pins[row_index]) == 0) {
// Pin HI, clear col bit
current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
} else {
// Pin LO, set col bit
current_matrix[row_index] |= (ROW_SHIFTER << current_col);
}
}
// Determine if the matrix changed state
if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) {
matrix_changed = true;
}
}
// Unselect cols
unselect_cols();
return matrix_changed;
}
void matrix_init(void) {
// initialize key pins
init_pins();
// initialize matrix state: all keys off
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
raw_matrix[i] = 0;
matrix[i] = 0;
}
debounce_init(MATRIX_ROWS);
matrix_init_quantum();
}
uint8_t matrix_scan(void) {
bool changed = false;
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
changed |= read_rows_on_col(raw_matrix, current_col);
}
debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
matrix_scan_quantum();
return (uint8_t)changed;
}
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