[Keyboard] Add GMMK Numpad (#20067)

Co-authored-by: Sergey Vlasov <sigprof@gmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

1 files changed, 133 insertions, 0 deletions

diff --git a/keyboards/gmmk/numpad/matrix.c b/keyboards/gmmk/numpad/matrix.c
new file mode 100644
index 0000000000..99adb38f18
--- /dev/null
+++ b/keyboards/gmmk/numpad/matrix.c
@@ -0,0 +1,133 @@
+// Copyright 2023 Cameron Varley (@RustedAperture)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*
+ * scan matrix
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include "wait.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+#include "debounce.h"
+#include "quantum.h"
+
+/* matrix state(1:on, 0:off) */
+extern matrix_row_t matrix[MATRIX_ROWS];     // debounced values
+extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+#define MATRIX_ROW_SHIFTER ((matrix_row_t)1)
+
+static inline void setPinOutput_writeLow(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON {
+        setPinOutput(pin);
+        writePinLow(pin);
+    }
+}
+
+static inline void setPinOutput_writeHigh(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON {
+        setPinOutput(pin);
+        writePinHigh(pin);
+    }
+}
+
+static inline void setPinInputHigh_atomic(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON {
+        setPinInputHigh(pin);
+    }
+}
+
+static inline uint8_t readMatrixPin(pin_t pin) {
+    if (pin != NO_PIN) {
+        return readPin(pin);
+    } else {
+        return 1;
+    }
+}
+
+static bool select_col(uint8_t col) {
+    pin_t pin = col_pins[col];
+    if (pin != NO_PIN) {
+        setPinOutput_writeLow(pin);
+        return true;
+    }
+    return false;
+}
+
+static void unselect_col(uint8_t col) {
+    pin_t pin = col_pins[col];
+    if (pin != NO_PIN) {
+#            ifdef MATRIX_UNSELECT_DRIVE_HIGH
+        setPinOutput_writeHigh(pin);
+#            else
+        setPinInputHigh_atomic(pin);
+#            endif
+    }
+}
+
+static void unselect_cols(void) {
+    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+        unselect_col(x);
+    }
+}
+
+
+__attribute__((weak)) void matrix_init_custom(void) {
+    unselect_cols();
+    for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        if (row_pins[x] != NO_PIN) {
+            setPinInputHigh_atomic(row_pins[x]);
+        }
+    }
+    setPinInputHigh_atomic(B8);
+}
+
+__attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col, matrix_row_t row_shifter) {    // Start with a clear matrix row
+        bool key_pressed = false;
+
+    // Select col
+    if (!select_col(current_col)) { // select col
+        return;                     // skip NO_PIN col
+    }
+    matrix_output_select_delay();
+
+    // For each row...
+    for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
+        // Check row pin state
+        if (current_col == 3 && row_index == 2 && readMatrixPin(B8) == 1) {
+            current_matrix[row_index] |= row_shifter;
+            key_pressed = !readMatrixPin(B8);
+        } else if (readMatrixPin(row_pins[row_index]) == 0) {
+            // Pin LO, set col bit
+            current_matrix[row_index] |= row_shifter;
+            key_pressed = true;
+        } else {
+            // Pin HI, clear col bit
+            current_matrix[row_index] &= ~row_shifter;
+        }
+    }
+
+    // Unselect col
+    unselect_col(current_col);
+    matrix_output_unselect_delay(current_col, key_pressed); // wait for all Row signals to go HIGH
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    static matrix_row_t temp_matrix[MATRIX_ROWS] = {0};
+
+    matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
+    for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
+        matrix_read_rows_on_col(temp_matrix, current_col, row_shifter);
+    }
+
+    bool changed = memcmp(current_matrix, temp_matrix, sizeof(temp_matrix)) != 0;
+    if (changed) {
+        memcpy(current_matrix, temp_matrix, sizeof(temp_matrix));
+    }
+    return changed;
+}