qmk_firmware/quantum/matrix.c
Nick Brassel f287597c19
Use single memcmp to determine if matrix changed. (#13064)
* Use memcmp to determine if matrix changed.

* Firmware size issues.

* Add documentation for the lack of need of MATRIX_ROW_PINS/MATRIX_COL_PINS, when overriding low-level matrix functions.
2021-06-09 17:19:42 +10:00

218 lines
6.6 KiB
C

/*
Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
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 <string.h>
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
#ifdef DIRECT_PINS
static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
# ifdef MATRIX_ROW_PINS
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
# endif // MATRIX_ROW_PINS
# ifdef MATRIX_COL_PINS
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
# endif // MATRIX_COL_PINS
#endif
/* matrix state(1:on, 0:off) */
extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
// user-defined overridable functions
__attribute__((weak)) void matrix_init_pins(void);
__attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
__attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
static inline void setPinOutput_writeLow(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinOutput(pin);
writePinLow(pin);
}
}
static inline void setPinInputHigh_atomic(pin_t pin) {
ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
}
// matrix code
#ifdef DIRECT_PINS
__attribute__((weak)) void matrix_init_pins(void) {
for (int row = 0; row < MATRIX_ROWS; row++) {
for (int col = 0; col < MATRIX_COLS; col++) {
pin_t pin = direct_pins[row][col];
if (pin != NO_PIN) {
setPinInputHigh(pin);
}
}
}
}
__attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
// Start with a clear matrix row
matrix_row_t current_row_value = 0;
for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
pin_t pin = direct_pins[current_row][col_index];
if (pin != NO_PIN) {
current_row_value |= readPin(pin) ? 0 : (MATRIX_ROW_SHIFTER << col_index);
}
}
// Update the matrix
current_matrix[current_row] = current_row_value;
}
#elif defined(DIODE_DIRECTION)
# if defined(MATRIX_ROW_PINS) && defined(MATRIX_COL_PINS)
# if (DIODE_DIRECTION == COL2ROW)
static void select_row(uint8_t row) { setPinOutput_writeLow(row_pins[row]); }
static void unselect_row(uint8_t row) { setPinInputHigh_atomic(row_pins[row]); }
static void unselect_rows(void) {
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
setPinInputHigh_atomic(row_pins[x]);
}
}
__attribute__((weak)) void matrix_init_pins(void) {
unselect_rows();
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
setPinInputHigh_atomic(col_pins[x]);
}
}
__attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
// Start with a clear matrix row
matrix_row_t current_row_value = 0;
// Select row
select_row(current_row);
matrix_output_select_delay();
// For each col...
for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
// Select the col pin to read (active low)
uint8_t pin_state = readPin(col_pins[col_index]);
// Populate the matrix row with the state of the col pin
current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
}
// Unselect row
unselect_row(current_row);
matrix_output_unselect_delay(); // wait for all Col signals to go HIGH
// Update the matrix
current_matrix[current_row] = current_row_value;
}
# elif (DIODE_DIRECTION == ROW2COL)
static void select_col(uint8_t col) { setPinOutput_writeLow(col_pins[col]); }
static void unselect_col(uint8_t col) { setPinInputHigh_atomic(col_pins[col]); }
static void unselect_cols(void) {
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
setPinInputHigh_atomic(col_pins[x]);
}
}
__attribute__((weak)) void matrix_init_pins(void) {
unselect_cols();
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
setPinInputHigh_atomic(row_pins[x]);
}
}
__attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
// Select col
select_col(current_col);
matrix_output_select_delay();
// For each row...
for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
// Check row pin state
if (readPin(row_pins[row_index]) == 0) {
// Pin LO, set col bit
current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
} else {
// Pin HI, clear col bit
current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col);
}
}
// Unselect col
unselect_col(current_col);
matrix_output_unselect_delay(); // wait for all Row signals to go HIGH
}
# else
# error DIODE_DIRECTION must be one of COL2ROW or ROW2COL!
# endif
# endif // defined(MATRIX_ROW_PINS) && defined(MATRIX_COL_PINS)
#else
# error DIODE_DIRECTION is not defined!
#endif
void matrix_init(void) {
// initialize key pins
matrix_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) {
matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
#if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
// Set row, read cols
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
matrix_read_cols_on_row(curr_matrix, current_row);
}
#elif (DIODE_DIRECTION == ROW2COL)
// Set col, read rows
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
matrix_read_rows_on_col(curr_matrix, current_col);
}
#endif
bool changed = memcmp(raw_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
if (changed) memcpy(raw_matrix, curr_matrix, sizeof(curr_matrix));
debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
matrix_scan_quantum();
return (uint8_t)changed;
}