114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/*
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* Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
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* Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
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*
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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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*
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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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*
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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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#include "mcp23018.h"
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#define SPLIT_MATRIX_COLS (MATRIX_COLS / 2)
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#define SECONDARY_ROW_OFFSET (MATRIX_ROWS / 2)
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typedef uint16_t mcp23018_pin_t;
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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[SPLIT_MATRIX_COLS] = MATRIX_COL_PINS;
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static const mcp23018_pin_t secondary_row_pins[MATRIX_ROWS] = SECONDARY_ROW_PINS;
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static const mcp23018_pin_t secondary_col_pins[SPLIT_MATRIX_COLS] = SECONDARY_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) { gpio_set_pin_input_high(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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gpio_set_pin_input_high(row_pins[x]);
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}
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}
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static void select_secondary_row(uint8_t row) {
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uint8_t gpioa = 0xFF & ~secondary_row_pins[row];
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mcp23018_writeReg(GPIOA, &gpioa, 1);
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}
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static void init_pins(void) {
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unselect_rows();
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for (uint8_t x = 0; x < SPLIT_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 matrix_row_t read_cols(void) {
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matrix_row_t state = 0;
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// For each col...
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for (uint8_t col_index = 0; col_index < SPLIT_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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state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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return state;
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}
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static matrix_row_t read_secondary_cols(void) {
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matrix_row_t state = 0;
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uint8_t mcp23018_pin_state[2];
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if (mcp23018_readReg(GPIOA, mcp23018_pin_state, 2)) {
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return 0;
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}
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uint16_t pins = mcp23018_pin_state[0] | (mcp23018_pin_state[1] << 8);
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for (uint8_t col_index = 0; col_index < SPLIT_MATRIX_COLS; col_index++) {
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uint16_t pin_state = pins & (secondary_col_pins[col_index]);
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state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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return state;
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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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matrix_row_t last_row_value = current_matrix[current_row];
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select_row(current_row);
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select_secondary_row(current_row);
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current_matrix[current_row] = read_cols() | (read_secondary_cols() << 6);
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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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void matrix_init_custom(void) { init_pins(); }
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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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(current_matrix, current_row);
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}
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return changed;
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}
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