Add edvorakjp keymap for the Helix (rev2) keyboard (#3340)

* add readme.md

* add extern declaration of edvorakjp_config to edvorakjp.h

* add oled.c

* add layout definitions

* add keymap.c

* add rules.mk

* fix rgblight issue: rgblight_setrgb() ignore RGBLIGHT_LIMIT_VAL

keyboards/helix/rev2/keymaps/edvorakjp/keymap.c

@@ -0,0 +1,61 @@
+#include QMK_KEYBOARD_H
+#include "split_util.h"
+#include "keymap_xrows.h"
+#ifdef SSD1306OLED
+  #include "oled.h"
+#endif
+
+// keymaps definitions are moved to keymap_Xrows.c.
+
+bool process_record_keymap(uint16_t keycode, keyrecord_t *record) {
+  switch(keycode) {
+    case KC_LOCK:
+      if (record->event.pressed) {
+        if (edvorakjp_config.enable_kc_lang) {
+          SEND_STRING( SS_LCTRL(SS_LSFT(SS_TAP(X_POWER))) );
+        } else {
+          SEND_STRING( SS_LGUI("l") );
+        }
+      }
+      return false;
+  }
+  return true;
+}
+
+#ifdef SSD1306OLED
+void matrix_init_keymap(void) {
+  //SSD1306 OLED init, make sure to add #define SSD1306OLED in config.h
+  iota_gfx_init(!has_usb());   // turns on the display
+}
+
+void matrix_scan_user(void) {
+  iota_gfx_task();  // this is what updates the display continuously
+}
+#endif
+
+#ifdef RGBLIGHT_ENABLE
+uint32_t layer_state_set_keymap(uint32_t state) {
+  rgblight_mode_noeeprom(1);
+  switch (biton32(state)) {
+    case _EDVORAKJ1:
+    case _EDVORAKJ2:
+      // _EDVORAKJ1 & J2 are same colored
+      rgblight_sethsv_noeeprom_white();
+      break;
+    case _LOWER:
+      rgblight_sethsv_noeeprom_red();
+      break;
+    case _RAISE:
+      rgblight_sethsv_noeeprom_blue();
+      break;
+    case _ADJUST:
+      rgblight_sethsv_noeeprom_green();
+      break;
+    default: //  for any other layers, or the default layer
+      rgblight_mode_noeeprom(28);
+      rgblight_sethsv_noeeprom_red();
+      break;
+  }
+  return state;
+}
+#endif