329 lines
10 KiB
C
329 lines
10 KiB
C
/*
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Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "atomic_util.h"
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#include "util.h"
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#include "wait.h"
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#include "matrix.h"
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#include "debounce.h"
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#ifndef readPort
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# include "gpio_extr.h"
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#endif
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#ifndef MATRIX_DEBUG_PIN
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# define MATRIX_DEBUG_PIN_INIT()
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# define MATRIX_DEBUG_SCAN_START()
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# define MATRIX_DEBUG_SCAN_END()
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# define MATRIX_DEBUG_DELAY_START()
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# define MATRIX_DEBUG_DELAY_END()
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# define MATRIX_DEBUG_GAP()
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#else
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# define MATRIX_DEBUG_GAP() asm volatile("nop \n nop" ::: "memory")
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#endif
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#ifndef MATRIX_IO_DELAY_ALWAYS
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# define MATRIX_IO_DELAY_ALWAYS 0
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#endif
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#ifdef DIRECT_PINS
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static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
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#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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# ifdef MATRIX_MUL_SELECT
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static const pin_t col_sel[MATRIX_COLS] = MATRIX_MUL_SEL;
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# endif
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#endif
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#ifdef MATRIX_IO_DELAY_PORTS
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static const pin_t delay_ports[] = {MATRIX_IO_DELAY_PORTS};
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static const port_data_t delay_masks[] = {MATRIX_IO_DELAY_MASKS};
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# ifdef MATRIX_IO_DELAY_MULSEL
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static const uint8_t delay_sel[] = {MATRIX_IO_DELAY_MULSEL};
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# endif
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#endif
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/* matrix state(1:on, 0:off) */
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extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
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static inline void setPinOutput_writeLow(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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gpio_set_pin_output(pin);
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gpio_write_pin_low(pin);
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}
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}
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static inline void setPinInputHigh_atomic(pin_t pin) {
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ATOMIC_BLOCK_FORCEON { gpio_set_pin_input_high(pin); }
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}
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// matrix code
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#ifdef DIRECT_PINS
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static void init_pins(void) {
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for (int row = 0; row < MATRIX_ROWS; row++) {
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for (int col = 0; col < MATRIX_COLS; col++) {
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pin_t pin = direct_pins[row][col];
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if (pin != NO_PIN) {
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gpio_set_pin_input_high(pin);
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}
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}
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}
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Start with a clear matrix row
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matrix_row_t current_row_value = 0;
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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pin_t pin = direct_pins[current_row][col_index];
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if (pin != NO_PIN) {
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current_row_value |= gpio_read_pin(pin) ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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}
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// If the row has changed, store the row and return the changed flag.
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if (current_matrix[current_row] != current_row_value) {
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current_matrix[current_row] = current_row_value;
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return true;
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}
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return false;
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}
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#elif defined(DIODE_DIRECTION)
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# if (DIODE_DIRECTION == COL2ROW)
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static void select_row(uint8_t row) { setPinOutput_writeLow(row_pins[row]); }
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static void unselect_row(uint8_t row) { setPinInputHigh_atomic(row_pins[row]); }
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static void unselect_rows(void) {
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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setPinInputHigh_atomic(row_pins[x]);
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}
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}
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static void init_pins(void) {
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# ifdef MATRIX_MUL_SELECT
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gpio_set_pin_output(MATRIX_MUL_SELECT);
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gpio_write_pin_low(MATRIX_MUL_SELECT);
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# endif
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unselect_rows();
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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setPinInputHigh_atomic(col_pins[x]);
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}
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Start with a clear matrix row
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matrix_row_t current_row_value = 0;
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// Select row
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select_row(current_row);
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matrix_output_select_delay();
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// For each col...
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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// Select the col pin to read (active low)
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# ifdef MATRIX_MUL_SELECT
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gpio_write_pin(MATRIX_MUL_SELECT, col_sel[col_index]);
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waitInputPinDelay();
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# endif
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uint8_t pin_state = gpio_read_pin(col_pins[col_index]);
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// Populate the matrix row with the state of the col pin
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current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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// Unselect row
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unselect_row(current_row);
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# ifdef MATRIX_IO_DELAY_PORTS
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if (current_row_value) { // wait for col signal to go HIGH
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bool is_pressed;
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do {
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MATRIX_DEBUG_DELAY_START();
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is_pressed = false;
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for (uint8_t i = 0; i < ARRAY_SIZE(delay_ports); i++) {
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# ifdef MATRIX_IO_DELAY_MULSEL
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gpio_write_pin(MATRIX_MUL_SELECT, delay_sel[i]);
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waitInputPinDelay();
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# endif
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is_pressed |= ((readPort(delay_ports[i]) & delay_masks[i]) != delay_masks[i]);
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}
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MATRIX_DEBUG_DELAY_END();
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} while (is_pressed);
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}
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# endif
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# ifdef MATRIX_IO_DELAY_ADAPTIVE
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if (current_row_value) { // wait for col signal to go HIGH
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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MATRIX_DEBUG_DELAY_START();
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# ifdef MATRIX_MUL_SELECT
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gpio_write_pin(MATRIX_MUL_SELECT, col_sel[col_index]);
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waitInputPinDelay();
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# endif
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while (gpio_read_pin(col_pins[col_index]) == 0) {
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}
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MATRIX_DEBUG_DELAY_END();
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}
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}
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# endif
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# ifdef MATRIX_IO_DELAY_ADAPTIVE2
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if (current_row_value) { // wait for col signal to go HIGH
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pin_t state;
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do {
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MATRIX_DEBUG_DELAY_START();
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state = 0;
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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MATRIX_DEBUG_DELAY_END();
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MATRIX_DEBUG_DELAY_START();
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# ifdef MATRIX_MUL_SELECT
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gpio_write_pin(MATRIX_MUL_SELECT, col_sel[col_index]);
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waitInputPinDelay();
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# endif
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state |= (gpio_read_pin(col_pins[col_index]) == 0);
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}
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MATRIX_DEBUG_DELAY_END();
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} while (state);
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}
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# endif
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if (MATRIX_IO_DELAY_ALWAYS || current_row + 1 < MATRIX_ROWS) {
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MATRIX_DEBUG_DELAY_START();
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matrix_output_unselect_delay(current_row, current_row_value != 0); // wait for col signal to go HIGH
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MATRIX_DEBUG_DELAY_END();
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}
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// If the row has changed, store the row and return the changed flag.
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if (current_matrix[current_row] != current_row_value) {
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current_matrix[current_row] = current_row_value;
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return true;
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}
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return false;
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}
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# elif (DIODE_DIRECTION == ROW2COL)
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static void select_col(uint8_t col) { setPinOutput_writeLow(col_pins[col]); }
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static void unselect_col(uint8_t col) { setPinInputHigh_atomic(col_pins[col]); }
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static void unselect_cols(void) {
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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setPinInputHigh_atomic(col_pins[x]);
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}
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}
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static void init_pins(void) {
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unselect_cols();
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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setPinInputHigh_atomic(row_pins[x]);
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}
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}
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
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bool matrix_changed = false;
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bool key_pressed = false;
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// Select col
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select_col(current_col);
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matrix_output_select_delay();
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// For each row...
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for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[row_index];
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matrix_row_t current_row_value = last_row_value;
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// Check row pin state
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if (gpio_read_pin(row_pins[row_index]) == 0) {
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// Pin LO, set col bit
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current_row_value |= (MATRIX_ROW_SHIFTER << current_col);
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key_pressed = true;
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} else {
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// Pin HI, clear col bit
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current_row_value &= ~(MATRIX_ROW_SHIFTER << current_col);
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}
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// Determine if the matrix changed state
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if ((last_row_value != current_row_value)) {
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matrix_changed |= true;
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current_matrix[row_index] = current_row_value;
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}
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}
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// Unselect col
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unselect_col(current_col);
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if (MATRIX_IO_DELAY_ALWAYS || current_col + 1 < MATRIX_COLS) {
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matrix_output_unselect_delay(current_col, key_pressed); // wait for col signal to go HIGH
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}
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return matrix_changed;
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}
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# else
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# error DIODE_DIRECTION must be one of COL2ROW or ROW2COL!
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# endif
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#else
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# error DIODE_DIRECTION is not defined!
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#endif
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void matrix_init(void) {
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// initialize key pins
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init_pins();
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// initialize matrix state: all keys off
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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raw_matrix[i] = 0;
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matrix[i] = 0;
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}
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debounce_init(MATRIX_ROWS);
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matrix_init_kb();
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}
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uint8_t matrix_scan(void) {
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bool changed = false;
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MATRIX_DEBUG_PIN_INIT();
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MATRIX_DEBUG_SCAN_START();
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#if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
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// Set row, read cols
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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changed |= read_cols_on_row(raw_matrix, current_row);
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}
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#elif (DIODE_DIRECTION == ROW2COL)
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// Set col, read rows
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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changed |= read_rows_on_col(raw_matrix, current_col);
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}
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#endif
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MATRIX_DEBUG_SCAN_END();
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MATRIX_DEBUG_GAP();
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MATRIX_DEBUG_SCAN_START();
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debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
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MATRIX_DEBUG_SCAN_END();
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MATRIX_DEBUG_GAP();
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MATRIX_DEBUG_SCAN_START();
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matrix_scan_kb();
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MATRIX_DEBUG_SCAN_END();
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return (uint8_t)changed;
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}
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