[Keyboard] add dual-direction diode capability for hbcp (#8795)

* add dual-direction diode capability

* update per PR requests

Co-authored-by: hineybush <hineybushkeyboards@gmail.com>

1 files changed, 139 insertions, 0 deletions

diff --git a/keyboards/hineybush/hbcp/matrix.c b/keyboards/hineybush/hbcp/matrix.c
new file mode 100644
index 000000000..d493a7e9e
--- /dev/null
+++ b/keyboards/hineybush/hbcp/matrix.c
@@ -0,0 +1,139 @@
+/*
+Copyright 2012-2020 Jun Wako, Jack Humbert, Yiancar, Ein Terakawa, Drashna, Josh Hinnebusch
+
+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 "util.h"
+#include "matrix.h"
+#include "debounce.h"
+#include "quantum.h"
+
+static const pin_t row_pins[] = MATRIX_ROW_PINS;
+static const pin_t col_pins[] = MATRIX_COL_PINS;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t last_matrix[MATRIX_ROWS];  // raw values of last scan
+
+// matrix code
+
+ void select_row(uint8_t row) {
+    setPinOutput(row_pins[row]);
+    writePinLow(row_pins[row]);
+}
+
+ void unselect_row(uint8_t row) { setPinInputHigh(row_pins[row]); }
+
+ 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();
+
+    // For each col...
+    for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+        // Select the col pin to read (active low)
+        uint8_t 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]);
+}
+
+ void select_col(uint8_t col) {
+    setPinOutput(col_pins[col]);
+    writePinLow(col_pins[col]);
+}
+
+ void unselect_col(uint8_t col) { setPinInputHigh(col_pins[col]); }
+
+ bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
+    bool matrix_changed = false;
+
+    // Select col and wait for col selecton to stabilize
+    select_col(current_col);
+    matrix_io_delay();
+
+    // For each row...
+    for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
+        // Store last value of row prior to reading
+        matrix_row_t last_row_value = current_matrix[row_index];
+
+        // Check row pin state
+        if (readPin(row_pins[row_index]) == 0) {
+            // Pin LO, set col bit
+            current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
+        }
+
+        // Determine if the matrix changed state
+        if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) {
+            matrix_changed = true;
+        }
+    }
+
+    // Unselect col
+    unselect_col(current_col);
+
+    return matrix_changed;
+}
+
+ void unselect_rows(void) {
+    for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInputHigh(row_pins[x]);
+    }
+}
+
+ void unselect_cols(void) {
+    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+        setPinInputHigh(col_pins[x]);
+    }
+}
+
+ void init_pins(void) {
+    unselect_rows();
+    unselect_cols();
+}
+
+void matrix_init_custom(void) {
+    // initialize key pins
+    init_pins();
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool changed = false;
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        last_matrix[current_row] = current_matrix[current_row];
+        read_cols_on_row(current_matrix, current_row);
+    }
+    for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
+        read_rows_on_col(current_matrix, current_col);
+    }
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        if (last_matrix[current_row] != current_matrix[current_row]) {
+            changed = true;
+        }
+    }
+    return (uint8_t)changed;
+}