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-rw-r--r--keyboards/barleycorn_smd/matrix.c138
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diff --git a/keyboards/barleycorn_smd/matrix.c b/keyboards/barleycorn_smd/matrix.c
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+/*
+Copyright 2021 Matthew Dias
+
+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 "quantum.h"
+#include "i2c_master.h"
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+static void unselect_rows(void) {
+ for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
+ setPinInputHigh(row_pins[x]);
+ }
+}
+
+static void select_row(uint8_t row) {
+ setPinOutput(row_pins[row]);
+ writePinLow(row_pins[row]);
+}
+
+static void unselect_row(uint8_t row) {
+ setPinInputHigh(row_pins[row]);
+}
+
+static void init_pins(void) {
+ unselect_rows();
+ // Set I/O
+ uint8_t send_data[2] = { 0xFF, 0x03};
+ i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data[0], 2, 20);
+ // Set Pull-up
+ i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x0C, &send_data[0], 2, 20);
+
+ for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+ if ( x < 8 ) {
+ setPinInputHigh(col_pins[x]);
+ }
+ }
+}
+
+void matrix_init_custom(void) {
+ // TODO: initialize hardware here
+ // Initialize I2C
+ i2c_init();
+
+ // initialize key pins
+ init_pins();
+ wait_ms(50);
+}
+
+static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
+ // Store last value of row prior to reading
+ matrix_row_t last_row_value = current_matrix[current_row];
+
+ // Clear data in matrix row
+ current_matrix[current_row] = 0;
+
+ // Select row and wait for row selecton to stabilize
+ select_row(current_row);
+ matrix_io_delay();
+
+ uint8_t port_expander_col_buffer[2];
+ i2c_readReg((PORT_EXPANDER_ADDRESS << 1), 0x12, &port_expander_col_buffer[0], 2, 20);
+
+ // For each col...
+ for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+ uint8_t pin_state;
+ // Select the col pin to read (active low)
+ switch (col_index) {
+ case 8 :
+ pin_state = port_expander_col_buffer[0] & (1 << 0);
+ break;
+ case 9 :
+ pin_state = port_expander_col_buffer[0] & (1 << 1);
+ break;
+ case 10 :
+ pin_state = port_expander_col_buffer[0] & (1 << 2);
+ break;
+ case 11 :
+ pin_state = port_expander_col_buffer[0] & (1 << 3);
+ break;
+ case 12 :
+ pin_state = port_expander_col_buffer[0] & (1 << 4);
+ break;
+ case 13 :
+ pin_state = port_expander_col_buffer[0] & (1 << 5);
+ break;
+ case 14 :
+ pin_state = port_expander_col_buffer[0] & (1 << 6);
+ break;
+ case 15 :
+ pin_state = port_expander_col_buffer[0] & (1 << 7);
+ break;
+ case 16 :
+ pin_state = port_expander_col_buffer[1] & (1 << 0);
+ break;
+ case 17 :
+ pin_state = port_expander_col_buffer[1] & (1 << 1);
+ break;
+ default :
+ pin_state = readPin(col_pins[col_index]);
+ }
+
+ // Populate the matrix row with the state of the col pin
+ current_matrix[current_row] |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+ }
+
+ // Unselect row
+ unselect_row(current_row);
+
+ return (last_row_value != current_matrix[current_row]);
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+ bool matrix_has_changed = false;
+
+ // Set row, read cols
+ for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+ matrix_has_changed |= read_cols_on_row(current_matrix, current_row);
+ }
+
+ return matrix_has_changed;
+}