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-rw-r--r--keyboards/xd96/matrix.c96
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diff --git a/keyboards/xd96/matrix.c b/keyboards/xd96/matrix.c
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+/* Copyright 2019
+ *
+ * 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 <avr/io.h>
+#include <string.h>
+#include "matrix.h"
+#include "pca9555.h"
+#include "quantum.h"
+
+#include "debug.h"
+
+// PCA9555 slave addresses
+#define IC1 0x20
+#define IC2 0x21
+
+//_____Utility funcs___________________________________________________________
+
+static void init_pins(void) {
+ // init all cols high - IC2 all input
+ pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);//same as initial state
+ pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);//same as initial state
+ pca9555_set_config(IC1, PCA9555_PORT1, ALL_INPUT);//same as initial state
+
+ // init all rows - IC1 port0 input
+ pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT);//same as initial state
+}
+
+static void select_row(uint8_t row) {
+ // For the XD96 all rows are on the same IC and port
+ // so its safe enough to assume here row == pin
+ uint8_t pin = row;
+ uint8_t mask = 1 << pin;
+
+ pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
+ pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT & (~mask));
+}
+
+static uint32_t read_cols(void) {
+ uint32_t state_1 = pca9555_readPins(IC2, PCA9555_PORT0);
+ uint32_t state_2 = pca9555_readPins(IC2, PCA9555_PORT1);
+ uint32_t state_3 = pca9555_readPins(IC1, PCA9555_PORT1);
+
+ // For the XD96 the pins are mapped to port expanders as follows:
+ // all 8 pins port 0 IC2, first 6 pins port 1 IC2, first 4 pins port 1 IC1
+ uint32_t state = (((state_3 & 0b00001111) << 14) | ((state_2 & 0b00111111) << 8) | state_1);
+ return (~state) & 0b111111111111111111;
+}
+
+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);
+ wait_us(30);
+
+ current_matrix[current_row] = read_cols();
+
+ // No need to Unselect row as the next `select_row` will blank everything
+
+ return (last_row_value != current_matrix[current_row]);
+}
+
+//_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
+
+void custom_matrix_init(void) {
+ pca9555_init(IC1);
+ pca9555_init(IC2);
+
+ init_pins();
+}
+
+bool custom_matrix_scan(matrix_row_t current_matrix[]) {
+ bool changed = false;
+ for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+ changed |= read_cols_on_row(current_matrix, current_row);
+ }
+ return changed;
+} \ No newline at end of file