17 files changed, 100 insertions, 46 deletions
diff --git a/keyboards/helix/rev2/config.h b/keyboards/helix/rev2/config.h
index fe82ce140f..467d2d66f6 100644
--- a/keyboards/helix/rev2/config.h
+++ b/keyboards/helix/rev2/config.h
@@ -30,7 +30,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define TAPPING_TERM 100
 
 /* Use I2C or Serial */
-#define USE_I2C
 #define USE_SERIAL
 //#define USE_MATRIX_I2C
 
@@ -68,6 +67,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3, B2 }
 // #define MATRIX_COL_PINS { B2, B3, B1, F7, F6, F5, F4 } //uncomment this line and comment line above if you need to reverse left-to-right key order
 
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION COL2ROW
+
 /* define if matrix has ghost */
 //#define MATRIX_HAS_GHOST
 
diff --git a/keyboards/helix/rev2/keymaps/default/readme.md b/keyboards/helix/rev2/keymaps/default/readme.md
index c618c47525..1237e5d5b6 100644
--- a/keyboards/helix/rev2/keymaps/default/readme.md
+++ b/keyboards/helix/rev2/keymaps/default/readme.md
@@ -137,6 +137,16 @@ $ make helix/rev2/oled/back:default          # with oled and backlight
 $ make helix/rev2/oled/under:default         # with oled and underglow
 ```
 
+build (experimental use of split_common)
+```
+$ make helix/rev2/sc:default
+$ make helix/rev2/sc/back:default
+$ make helix/rev2/sc/under:default
+$ make helix/rev2/sc/oled:default
+$ make helix/rev2/sc/oledback:default
+$ make helix/rev2/sc/oledunder:default
+```
+
 flash to keyboard
 ```
 $ make helix:default:flash
diff --git a/keyboards/helix/rev2/keymaps/xulkal/rules.mk b/keyboards/helix/rev2/keymaps/xulkal/rules.mk
index a636b2a619..03800f9bb9 100644
--- a/keyboards/helix/rev2/keymaps/xulkal/rules.mk
+++ b/keyboards/helix/rev2/keymaps/xulkal/rules.mk
@@ -9,3 +9,5 @@ OLED_DRIVER_ENABLE = yes
 OPT_DEFS += -DOLED_FONT_H=\"common/glcdfont.c\"
 # Xulkal specific oled define
 OPT_DEFS += -DOLED_90ROTATION
+
+SPLIT_KEYBOARD = yes
diff --git a/keyboards/helix/rev2/local_features.mk b/keyboards/helix/rev2/local_features.mk
index 0f4285eea9..4b120936de 100644
--- a/keyboards/helix/rev2/local_features.mk
+++ b/keyboards/helix/rev2/local_features.mk
@@ -10,7 +10,7 @@ define HELIX_CUSTOMISE_MSG
   $(info -  OLED_ENABLE          = $(OLED_ENABLE))
   $(info -  LED_BACK_ENABLE      = $(LED_BACK_ENABLE))
   $(info -  LED_UNDERGLOW_ENABLE = $(LED_UNDERGLOW_ENABLE))
-  $(info -  LED_ANIMATION        = $(LED_ANIMATIONS))
+  $(info -  LED_ANIMATIONS       = $(LED_ANIMATIONS))
   $(info -  IOS_DEVICE_ENABLE    = $(IOS_DEVICE_ENABLE))
   $(info )
 endef
@@ -43,12 +43,35 @@ endef
     ifeq ($(findstring ios,$(HELIX)), ios)
       IOS_DEVICE_ENABLE = yes
     endif
+    ifeq ($(findstring scan,$(HELIX)), scan)
+      # use DEBUG_MATRIX_SCAN_RATE
+      # see docs/newbs_testing_debugging.md
+      OPT_DEFS +=  -DDEBUG_MATRIX_SCAN_RATE
+      CONSOLE_ENABLE = yes
+      SHOW_VERBOSE_INFO = yes
+    endif
     ifeq ($(findstring verbose,$(HELIX)), verbose)
-       SHOW_VERBOSE_INFO = yes
+      SHOW_VERBOSE_INFO = yes
     endif
     SHOW_HELIX_OPTIONS = yes
   endif
 
+ifneq ($(strip $(SPLIT_KEYBOARD)), yes)
+  SRC += local_drivers/serial.c
+  KEYBOARD_PATHS += $(HELIX_TOP_DIR)/local_drivers
+
+  # A workaround until #7089 is merged.
+  #   serial.c must not be compiled with the -lto option.
+  #   The current LIB_SRC has a side effect with the -fno-lto option, so use it.
+  LIB_SRC += local_drivers/serial.c
+
+  CUSTOM_MATRIX = yes
+
+  SRC += rev2/matrix.c
+  SRC += rev2/split_util.c
+  SRC += rev2/split_scomm.c
+endif
+
 ########
 # convert Helix-specific options (that represent combinations of standard options)
 #   into QMK standard options.
@@ -80,18 +103,22 @@ ifeq ($(strip $(LED_ANIMATIONS)), yes)
 endif
 
 ifeq ($(strip $(OLED_ENABLE)), yes)
+    SRC += local_drivers/i2c.c
+    SRC += local_drivers/ssd1306.c
+    KEYBOARD_PATHS += $(HELIX_TOP_DIR)/local_drivers
     OPT_DEFS += -DOLED_ENABLE
-endif
-
-ifeq ($(strip $(LOCAL_GLCDFONT)), yes)
-    OPT_DEFS += -DLOCAL_GLCDFONT
+    ifeq ($(strip $(LOCAL_GLCDFONT)), yes)
+        OPT_DEFS += -DLOCAL_GLCDFONT
+    endif
 endif
 
 ifneq ($(strip $(SHOW_HELIX_OPTIONS)),)
   $(eval $(call HELIX_CUSTOMISE_MSG))
   ifneq ($(strip $(SHOW_VERBOSE_INFO)),)
-     $(info -- RGBLIGHT_ENABLE = $(RGBLIGHT_ENABLE))
-     $(info -- OPT_DEFS        = $(OPT_DEFS))
+     $(info -- RGBLIGHT_ENABLE    = $(RGBLIGHT_ENABLE))
+     $(info -- OLED_DRIVER_ENABLE = $(OLED_DRIVER_ENABLE))
+     $(info -- CONSOLE_ENABLE     = $(CONSOLE_ENABLE))
+     $(info -- OPT_DEFS           = $(OPT_DEFS))
      $(info -- LINK_TIME_OPTIMIZATION_ENABLE = $(LINK_TIME_OPTIMIZATION_ENABLE))
      $(info )
   endif
diff --git a/keyboards/helix/rev2/matrix.c b/keyboards/helix/rev2/matrix.c
index 70a6cb0a5e..050dcac2d2 100644
--- a/keyboards/helix/rev2/matrix.c
+++ b/keyboards/helix/rev2/matrix.c
@@ -47,7 +47,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 static uint8_t debouncing = DEBOUNCE;
 static const int ROWS_PER_HAND = MATRIX_ROWS/2;
 static uint8_t error_count = 0;
-uint8_t is_master = 0 ;
 
 static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
 static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
@@ -111,8 +110,6 @@ void matrix_init(void)
         matrix_debouncing[i] = 0;
     }
 
-    is_master = has_usb();
-
     matrix_init_quantum();
 }
 
@@ -200,7 +197,7 @@ int serial_transaction(int master_changed) {
 
 uint8_t matrix_scan(void)
 {
-    if (is_master) {
+    if (is_helix_master()) {
         matrix_master_scan();
     }else{
         matrix_slave_scan();
diff --git a/keyboards/helix/rev2/post_config.h b/keyboards/helix/rev2/post_config.h
new file mode 100644
index 0000000000..dda73d5d22
--- /dev/null
+++ b/keyboards/helix/rev2/post_config.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#if defined(SPLIT_KEYBOARD) /* if use split_common */
+#  if defined(RGBLIGHT_ENABLE) && !defined(RGBLIGHT_SPLIT)
+#    define RGBLIGHT_SPLIT /* helix hardware need this */
+#  endif
+#endif
diff --git a/keyboards/helix/rev2/rev2.c b/keyboards/helix/rev2/rev2.c
index abaa02cdb1..12b8ae9efa 100644
--- a/keyboards/helix/rev2/rev2.c
+++ b/keyboards/helix/rev2/rev2.c
@@ -1,5 +1,9 @@
 #include "helix.h"
 
+// Each keymap.c should use is_keyboard_master() instead of 'is_master'.
+// But keep 'is_master' for a while for backwards compatibility
+//  for the old keymap.c.
+uint8_t is_master = false;
 
 #ifdef SSD1306OLED
 #include "ssd1306.h"
@@ -15,7 +19,23 @@ void led_set_kb(uint8_t usb_led) {
 #endif
 
 void matrix_init_kb(void) {
+    // Each keymap.c should use is_keyboard_master() instead of is_master.
+    // But keep is_master for a while for backwards compatibility
+    //  for the old keymap.c.
+    is_master = is_keyboard_master();
 
 	matrix_init_user();
 };
 
+void keyboard_post_init_kb(void) {
+#if defined(DEBUG_MATRIX_SCAN_RATE)
+    debug_enable = true;
+#endif
+    keyboard_post_init_user();
+}
+
+#if defined(SPLIT_KEYBOARD) && defined(SSD1306OLED)
+void matrix_slave_scan_user(void) {
+    matrix_scan_user();
+}
+#endif
diff --git a/keyboards/helix/rev2/rev2.h b/keyboards/helix/rev2/rev2.h
index 4e69daef50..8b82a4a6ee 100644
--- a/keyboards/helix/rev2/rev2.h
+++ b/keyboards/helix/rev2/rev2.h
@@ -4,18 +4,16 @@
 
 #include "quantum.h"
 
-#ifdef RGBLIGHT_ENABLE
-//rgb led driver
-#include "ws2812.h"
+#ifndef SPLIT_KEYBOARD
+  extern bool is_helix_master(void);
+  #define is_keyboard_master() is_helix_master()
 #endif
 
-#ifdef USE_I2C
-#include <stddef.h>
-#ifdef __AVR__
-  #include <avr/io.h>
-  #include <avr/interrupt.h>
-#endif
-#endif
+// Each keymap.c should use is_keyboard_master() instead of 'is_master', 'has_usb()'.
+// But keep 'is_master' for a while for backwards compatibility
+//  for the old keymap.c.
+extern uint8_t is_master; // 'is_master' will be obsolete, it is recommended to use 'is_keyboard_master ()' instead.
+#define has_usb() is_keyboard_master()
 
 #if MATRIX_ROWS == 8 // HELIX_ROWS == 4
 #ifndef FLIP_HALF
diff --git a/keyboards/helix/rev2/rules.mk b/keyboards/helix/rev2/rules.mk
index 7357d568c6..db584c0b23 100644
--- a/keyboards/helix/rev2/rules.mk
+++ b/keyboards/helix/rev2/rules.mk
@@ -1,21 +1,5 @@
 KEYBOARD_LOCAL_FEATURES_MK := $(dir $(lastword $(MAKEFILE_LIST)))local_features.mk
 
-SRC += local_drivers/i2c.c
-SRC += local_drivers/serial.c
-SRC += local_drivers/ssd1306.c
-KEYBOARD_PATHS += $(HELIX_TOP_DIR)/local_drivers
-
-# A workaround until #7089 is merged.
-#   serial.c must not be compiled with the -lto option.
-#   The current LIB_SRC has a side effect with the -fno-lto option, so use it.
-LIB_SRC += local_drivers/serial.c
-
-CUSTOM_MATRIX = yes
-
-SRC += rev2/matrix.c
-SRC += rev2/split_util.c
-SRC += rev2/split_scomm.c
-
 # Helix Spacific Build Options default values
 HELIX_ROWS = 5              # Helix Rows is 4 or 5
 OLED_ENABLE = no            # OLED_ENABLE
diff --git a/keyboards/helix/rev2/sc/back/rules.mk b/keyboards/helix/rev2/sc/back/rules.mk
new file mode 100644
index 0000000000..066fffb74a
--- /dev/null
+++ b/keyboards/helix/rev2/sc/back/rules.mk
@@ -0,0 +1 @@
+LED_BACK_ENABLE = yes
diff --git a/keyboards/helix/rev2/sc/oled/rules.mk b/keyboards/helix/rev2/sc/oled/rules.mk
new file mode 100644
index 0000000000..dd68e9d3b0
--- /dev/null
+++ b/keyboards/helix/rev2/sc/oled/rules.mk
@@ -0,0 +1 @@
+OLED_ENABLE = yes
diff --git a/keyboards/helix/rev2/sc/oledback/rules.mk b/keyboards/helix/rev2/sc/oledback/rules.mk
new file mode 100644
index 0000000000..645984f865
--- /dev/null
+++ b/keyboards/helix/rev2/sc/oledback/rules.mk
@@ -0,0 +1,2 @@
+OLED_ENABLE = yes
+LED_BACK_ENABLE = yes
diff --git a/keyboards/helix/rev2/sc/oledunder/rules.mk b/keyboards/helix/rev2/sc/oledunder/rules.mk
new file mode 100644
index 0000000000..e415cbd492
--- /dev/null
+++ b/keyboards/helix/rev2/sc/oledunder/rules.mk
@@ -0,0 +1,2 @@
+OLED_ENABLE = yes
+LED_UNDERGLOW_ENABLE = yes
diff --git a/keyboards/helix/rev2/sc/rules.mk b/keyboards/helix/rev2/sc/rules.mk
new file mode 100644
index 0000000000..d38a618090
--- /dev/null
+++ b/keyboards/helix/rev2/sc/rules.mk
@@ -0,0 +1 @@
+SPLIT_KEYBOARD = yes
diff --git a/keyboards/helix/rev2/sc/under/rules.mk b/keyboards/helix/rev2/sc/under/rules.mk
new file mode 100644
index 0000000000..a37aa6fab3
--- /dev/null
+++ b/keyboards/helix/rev2/sc/under/rules.mk
@@ -0,0 +1 @@
+LED_UNDERGLOW_ENABLE = yes
diff --git a/keyboards/helix/rev2/split_util.c b/keyboards/helix/rev2/split_util.c
index 9d31d0dec3..ab40315487 100644
--- a/keyboards/helix/rev2/split_util.c
+++ b/keyboards/helix/rev2/split_util.c
@@ -45,7 +45,7 @@ bool waitForUsb(void) {
 }
 
 
-__attribute__((weak)) bool is_keyboard_left(void) {
+bool is_keyboard_left(void) {
 #if defined(SPLIT_HAND_PIN)
     // Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
     setPinInput(SPLIT_HAND_PIN);
@@ -53,13 +53,13 @@ __attribute__((weak)) bool is_keyboard_left(void) {
 #elif defined(EE_HANDS)
     return eeconfig_read_handedness();
 #elif defined(MASTER_RIGHT)
-    return !has_usb();
+    return !is_helix_master();
 #endif
 
-    return has_usb();
+    return is_helix_master();
 }
 
-__attribute__((weak)) bool has_usb(void) {
+bool is_helix_master(void) {
     static enum { UNKNOWN, MASTER, SLAVE } usbstate = UNKNOWN;
 
     // only check once, as this is called often
@@ -100,11 +100,10 @@ static void keyboard_slave_setup(void) {
 void split_keyboard_setup(void) {
    isLeftHand = is_keyboard_left();
 
-   if (has_usb()) {
+   if (is_helix_master()) {
       keyboard_master_setup();
    } else {
       keyboard_slave_setup();
    }
    sei();
 }
-
diff --git a/keyboards/helix/rev2/split_util.h b/keyboards/helix/rev2/split_util.h
index 687ca19bd3..c0ecdb0974 100644
--- a/keyboards/helix/rev2/split_util.h
+++ b/keyboards/helix/rev2/split_util.h
@@ -12,7 +12,7 @@ extern volatile bool isLeftHand;
 void matrix_slave_scan(void);
 
 void split_keyboard_setup(void);
-bool has_usb(void);
+bool is_helix_master(void);
 
 void matrix_master_OLED_init (void);