153 lines
4.3 KiB
C
153 lines
4.3 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 "matrix.h"
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#if (MATRIX_COLS <= 8)
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# define ROW_SHIFTER ((uint8_t)1)
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#elif (MATRIX_COLS <= 16)
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# define ROW_SHIFTER ((uint16_t)1)
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#elif (MATRIX_COLS <= 32)
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# define ROW_SHIFTER ((uint32_t)1)
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#endif
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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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static void select_row(uint8_t row) {
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gpio_set_pin_output(row_pins[row]);
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gpio_write_pin_low(row_pins[row]);
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}
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static void unselect_row(uint8_t row) {
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gpio_set_pin_input_high(row_pins[row]);
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}
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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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gpio_set_pin_input_high(row_pins[x]);
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}
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}
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static void select_col(uint8_t col) {
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gpio_set_pin_output(col_pins[col]);
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gpio_write_pin_low(col_pins[col]);
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}
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static void unselect_col(uint8_t col) {
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gpio_set_pin_input_high(col_pins[col]);
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}
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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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gpio_set_pin_input_high(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_rows();
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unselect_cols();
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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gpio_set_pin_input_high(col_pins[x]);
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}
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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gpio_set_pin_input_high(row_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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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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// Select row and wait for row selecton to stabilize
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select_row(current_row);
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matrix_io_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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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_matrix[current_row] |= pin_state ? 0 : (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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return (last_row_value != current_matrix[current_row]);
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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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// Select col and wait for col selecton to stabilize
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select_col(current_col);
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matrix_io_delay();
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// For each row...
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for(uint8_t row_index = 0; row_index < MATRIX_ROWS / 2; row_index++) {
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uint8_t tmp = row_index + MATRIX_ROWS / 2;
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[tmp];
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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_matrix[tmp] |= (ROW_SHIFTER << current_col);
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} else {
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// Pin HI, clear col bit
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current_matrix[tmp] &= ~(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_matrix[tmp]) && !(matrix_changed)) {
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matrix_changed = true;
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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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return matrix_changed;
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}
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void matrix_init_custom(void) {
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// initialize key pins
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init_pins();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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// Set row, read cols
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS / 2; current_row++) {
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changed |= read_cols_on_row(current_matrix, current_row);
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}
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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(current_matrix, current_col);
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}
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return changed;
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}
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