[Keyboard] Added pistachio_pro (#13466)

* Added pistachio_pro

* Apply suggestions from code review

* Apply suggestions from code review

1 files changed, 151 insertions, 0 deletions

diff --git a/keyboards/pistachio_pro/matrix.c b/keyboards/pistachio_pro/matrix.c
new file mode 100644
index 000000000..6cbfb6dfe
--- /dev/null
+++ b/keyboards/pistachio_pro/matrix.c
@@ -0,0 +1,151 @@
+/*
+Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
+
+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 "matrix.h"
+#include "quantum.h"
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+static inline void setPinOutput_writeLow(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON {
+        setPinOutput(pin);
+        writePinLow(pin);
+    }
+}
+
+static inline void setPinInputHigh_atomic(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
+}
+
+static void select_row(uint8_t row) {
+    setPinOutput_writeLow(row_pins[row]);
+}
+
+static void unselect_row(uint8_t row) {
+    setPinInputHigh_atomic(row_pins[row]);
+}
+
+static void unselect_rows(void) {
+    for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInputHigh_atomic(row_pins[x]);
+    }
+}
+
+static void select_col(uint8_t col) {
+    setPinOutput_writeLow(col_pins[col]);
+}
+
+static void unselect_col(uint8_t col) {
+    setPinInputHigh_atomic(col_pins[col]);
+}
+
+static void unselect_cols(void) {
+    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+        setPinInputHigh_atomic(col_pins[x]);
+    }
+}
+
+static void init_pins(void) {
+    unselect_rows();
+    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+        setPinInputHigh_atomic(col_pins[x]);
+    }
+    unselect_cols();
+    for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInputHigh_atomic(row_pins[x]);
+    }
+}
+
+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];
+
+    // Select row
+    select_row(current_row);
+    matrix_io_delay();
+
+    // For each col...
+    for (uint8_t col_index = 0; col_index < MATRIX_COLS / 2; col_index++) {
+        // Check row pin state
+        if (readPin(col_pins[col_index])) {
+            // Pin HI, clear col bit
+            current_matrix[current_row] &= ~(MATRIX_ROW_SHIFTER << col_index);
+        } else {
+            // Pin LO, set col bit
+            current_matrix[current_row] |= (MATRIX_ROW_SHIFTER << col_index);
+        }
+    }
+
+    // Unselect row
+    unselect_row(current_row);
+
+    return (last_row_value != current_matrix[current_row]);
+}
+
+static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
+    bool matrix_changed = false;
+
+    // Select col
+    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])) {
+            // Pin HI, clear col bit
+            current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << ( current_col + MATRIX_COLS/2));
+        } else {
+            // Pin LO, set col bit
+            current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << ( current_col + MATRIX_COLS/2));
+        }
+
+        // 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 matrix_init_custom(void) {
+    init_pins();
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool changed = false;
+
+    // Set row, read cols
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        changed |= read_cols_on_row(current_matrix, current_row);
+    }
+    // Set col, read rows
+    for (uint8_t current_col = 0; current_col < (MATRIX_COLS/2); current_col++) {
+        changed |= read_rows_on_col(current_matrix, current_col);
+    }
+
+    return (uint8_t)changed;
+}