Port DIRECT_PINS from split_common/matrix.c to matrix.c (#5091)

* Port DIRECT_PINS from split_common/matrix.c to matrix.c

* Reorder matrix.c to remove foward declaration and match split_common/matrix.c

* Refactor nano to use DIRECT_PINS

* Reorder matrix.c to remove foward declaration and match split_common/matrix.c

* Add DIRECT_PINS documentation

* Reorder matrix.c to remove foward declaration and match split_common/matrix.c - fix logic from inherited from split_common

* Add DIRECT_PINS documentation - review comments

quantum/matrix.c

@@ -45,7 +45,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     extern const matrix_row_t matrix_mask[];
 #endif
 
-#if (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
+#ifdef DIRECT_PINS
+static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
+#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
 static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
 static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 #endif
@@ -54,20 +56,6 @@ static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 static matrix_row_t raw_matrix[MATRIX_ROWS]; //raw values
 static matrix_row_t matrix[MATRIX_ROWS]; //debounced values
 
-#if (DIODE_DIRECTION == COL2ROW)
-    static void init_cols(void);
-    static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
-    static void unselect_rows(void);
-    static void select_row(uint8_t row);
-    static void unselect_row(uint8_t row);
-#elif (DIODE_DIRECTION == ROW2COL)
-    static void init_rows(void);
-    static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
-    static void unselect_cols(void);
-    static void unselect_col(uint8_t col);
-    static void select_col(uint8_t col);
-#endif
-
 __attribute__ ((weak))
 void matrix_init_quantum(void) {
     matrix_init_kb();
@@ -106,49 +94,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-void matrix_init(void) {
-
-    // initialize row and col
-#if (DIODE_DIRECTION == COL2ROW)
-    unselect_rows();
-    init_cols();
-#elif (DIODE_DIRECTION == ROW2COL)
-    unselect_cols();
-    init_rows();
-#endif
-
-    // initialize matrix state: all keys off
-    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
-        raw_matrix[i] = 0;
-        matrix[i] = 0;
-    }
-    debounce_init(MATRIX_ROWS);
-
-    matrix_init_quantum();
-}
-
-uint8_t matrix_scan(void)
-{
-  bool changed = false;
-
-#if (DIODE_DIRECTION == COL2ROW)
-  // Set row, read cols
-  for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
-    changed |= read_cols_on_row(raw_matrix, current_row);
-  }
-#elif (DIODE_DIRECTION == ROW2COL)
-  // Set col, read rows
-  for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
-    changed |= read_rows_on_col(raw_matrix, current_col);
-  }
-#endif
-
-  debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
-
-  matrix_scan_quantum();
-  return 1;
-}
-
 //Deprecated.
 bool matrix_is_modified(void)
 {
@@ -195,11 +140,55 @@ uint8_t matrix_key_count(void)
 }
 
 
+#ifdef DIRECT_PINS
+
+static void init_pins(void) {
+  for (int row = 0; row < MATRIX_ROWS; row++) {
+    for (int col = 0; col < MATRIX_COLS; col++) {
+      pin_t pin = direct_pins[row][col];
+      if (pin != NO_PIN) {
+        setPinInputHigh(pin);
+      }
+    }
+  }
+}
+
+static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
+  matrix_row_t last_row_value = current_matrix[current_row];
+  current_matrix[current_row] = 0;
+
+  for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+    pin_t pin = direct_pins[current_row][col_index];
+    if (pin != NO_PIN) {
+      current_matrix[current_row] |= readPin(pin) ? 0 : (ROW_SHIFTER << col_index);
+    }
+  }
+
+  return (last_row_value != current_matrix[current_row]);
+}
+
+#elif (DIODE_DIRECTION == COL2ROW)
 
-#if (DIODE_DIRECTION == COL2ROW)
+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_cols(void)
+static void unselect_rows(void)
 {
+    for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInput(row_pins[x]);
+    }
+}
+
+static void init_pins(void) {
+  unselect_rows();
   for (uint8_t x = 0; x < MATRIX_COLS; x++) {
     setPinInputHigh(col_pins[x]);
   }
@@ -233,28 +222,28 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
     return (last_row_value != current_matrix[current_row]);
 }
 
-static void select_row(uint8_t row)
+#elif (DIODE_DIRECTION == ROW2COL)
+
+static void select_col(uint8_t col)
 {
-    setPinOutput(row_pins[row]);
+    setPinOutput(col_pins[col]);
-    writePinLow(row_pins[row]);
+    writePinLow(col_pins[col]);
 }
 
-static void unselect_row(uint8_t row)
+static void unselect_col(uint8_t col)
 {
-    setPinInputHigh(row_pins[row]);
+    setPinInputHigh(col_pins[col]);
 }
 
-static void unselect_rows(void)
+static void unselect_cols(void)
 {
-    for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
+    for(uint8_t x = 0; x < MATRIX_COLS; x++) {
-        setPinInput(row_pins[x]);
+        setPinInputHigh(col_pins[x]);
     }
 }
 
-#elif (DIODE_DIRECTION == ROW2COL)
+static void init_pins(void) {
-
+  unselect_cols();
-static void init_rows(void)
-{
   for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
     setPinInputHigh(row_pins[x]);
   }
@@ -300,22 +289,42 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
     return matrix_changed;
 }
 
-static void select_col(uint8_t col)
+#endif
-{
+
-    setPinOutput(col_pins[col]);
+void matrix_init(void) {
-    writePinLow(col_pins[col]);
+
+    // initialize key pins
+    init_pins();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+        raw_matrix[i] = 0;
+        matrix[i] = 0;
     }
 
-static void unselect_col(uint8_t col)
+    debounce_init(MATRIX_ROWS);
-{
+
-    setPinInputHigh(col_pins[col]);
+    matrix_init_quantum();
 }
 
-static void unselect_cols(void)
+uint8_t matrix_scan(void)
 {
-    for(uint8_t x = 0; x < MATRIX_COLS; x++) {
+  bool changed = false;
-        setPinInputHigh(col_pins[x]);
+
+#if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
+  // Set row, read cols
+  for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+    changed |= read_cols_on_row(raw_matrix, current_row);
   }
+#elif (DIODE_DIRECTION == ROW2COL)
+  // Set col, read rows
+  for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
+    changed |= read_rows_on_col(raw_matrix, current_col);
   }
-
 #endif
+
+  debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+
+  matrix_scan_quantum();
+  return 1;
+}