Added right vs left specific pin assignments for dip switch

docs/feature_dip_switch.md

@@ -9,6 +9,8 @@ and this to your `config.h`:
 ```c
 // Connects each switch in the dip switch to the GPIO pin of the MCU
 #define DIP_SWITCH_PINS { B14, A15, A10, B9 }
+// For split keyboards, you can separately define the right side pins
+#define DIP_SWITCH_PINS_RIGHT { ... }
 ```
 
 or
@@ -92,6 +94,20 @@ void dip_switch_update_mask_user(uint32_t state) {
 }
 ```
 
+For DIP switch processing on the slave half of split keyboards, you can add `dip_switch_scan(false);`
+to either your base keyboard .c file in `matrix_slave_scan_kb()` or to your user level 
+`matrix_slave_scan_user()` as needed:
+
+```c
+void matrix_slave_scan_kb() {
+    dip_switch_read(false);
+    matrix_slave_scan_user();
+}
+// or
+void matrix_slave_scan_user() {
+    dip_switch_read(false);
+}
+```
 
 ## Hardware
 

docs/ja/feature_dip_switch.md

@@ -14,6 +14,8 @@ DIP スイッチは、以下を `rules.mk` に追加することでサポート
 ```c
 // Connects each switch in the dip switch to the GPIO pin of the MCU
 #define DIP_SWITCH_PINS { B14, A15, A10, B9 }
+// For split keyboards, you can separately define the right side pins
+#define DIP_SWITCH_PINS_RIGHT { ... }
 ```
 
 あるいは

quantum/dip_switch.c

@@ -17,6 +17,9 @@
  */
 
 #include "dip_switch.h"
+#ifdef SPLIT_KEYBOARD
+#   include "split_common/split_util.h"
+#endif
 
 // for memcpy
 #include <string.h>
@@ -32,6 +35,9 @@
 #ifdef DIP_SWITCH_PINS
 #    define NUMBER_OF_DIP_SWITCHES (sizeof(dip_switch_pad) / sizeof(pin_t))
 static pin_t dip_switch_pad[] = DIP_SWITCH_PINS;
+#  if defined(SPLIT_KEYBOARD) && defined(DIP_SWITCH_PINS_RIGHT)
+static pin_t dip_switch_pad_right[] = DIP_SWITCH_PINS_RIGHT;
+#  endif
 #endif
 
 #ifdef DIP_SWITCH_MATRIX_GRID
@@ -60,7 +66,15 @@ __attribute__((weak)) void dip_switch_update_mask_kb(uint32_t state) { dip_switc
 void dip_switch_init(void) {
 #ifdef DIP_SWITCH_PINS
     for (uint8_t i = 0; i < NUMBER_OF_DIP_SWITCHES; i++) {
-        setPinInputHigh(dip_switch_pad[i]);
+#  if defined(SPLIT_KEYBOARD) && defined(DIP_SWITCH_PINS_RIGHT)
+        if ( isLeftHand ) {
+#  endif
+            setPinInputHigh(dip_switch_pad[i]);
+#  if defined(SPLIT_KEYBOARD) && defined(DIP_SWITCH_PINS_RIGHT)
+        } else {
+            setPinInputHigh(dip_switch_pad_right[i]);
+        }
+#  endif
     }
     dip_switch_read(true);
 #endif
@@ -89,7 +103,15 @@ void dip_switch_read(bool forced) {
 
     for (uint8_t i = 0; i < NUMBER_OF_DIP_SWITCHES; i++) {
 #ifdef DIP_SWITCH_PINS
-        dip_switch_state[i] = !readPin(dip_switch_pad[i]);
+#  if defined(SPLIT_KEYBOARD) && defined(DIP_SWITCH_PINS_RIGHT)
+        if (isLeftHand) {
+#  endif
+            dip_switch_state[i] = !readPin(dip_switch_pad[i]);
+#  if defined(SPLIT_KEYBOARD) && defined(DIP_SWITCH_PINS_RIGHT)
+        } else {
+            dip_switch_state[i] = !readPin(dip_switch_pad_right[i]);
+        }
+#  endif
 #endif
 #ifdef DIP_SWITCH_MATRIX_GRID
         dip_switch_state[i] = peek_matrix(dip_switch_pad[i].row, dip_switch_pad[i].col, read_raw);