fix implementation issues from SSD1306 clean up, added rotation (#1494)

* moved OLED update task to keymap

* fix splitting render display to keymap

* Added rotation option for OLED, fixed splitting display render update to keymap

* issues with attribute

keyboards/lets_split/keymaps/OLED_sample/config.h

@@ -36,6 +36,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define FLIP_HALF
 
 #define SSD1306OLED
+//#define OLED_ROTATE180
 
 
 #define PREVENT_STUCK_MODIFIERS

keyboards/lets_split/keymaps/OLED_sample/keymap.c

@@ -358,6 +358,7 @@ const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
     return MACRO_NONE;
 }
 
+
 void matrix_update(struct CharacterMatrix *dest,
                           const struct CharacterMatrix *source) {
   if (memcmp(dest->display, source->display, sizeof(dest->display))) {
@@ -366,6 +367,17 @@ void matrix_update(struct CharacterMatrix *dest,
   }
 }
 
+//assign the right code to your layers for OLED display
+#define L_BASE 0
+#define L_LOWER 8
+#define L_RAISE 16
+#define L_FNLAYER 64
+#define L_NUMLAY 128
+#define L_NLOWER 136
+#define L_NFNLAYER 192
+#define L_MOUSECURSOR 256
+#define L_ADJUST 65560
+
 void iota_gfx_task_user(void) {
 #if DEBUG_TO_SCREEN
   if (debug_enable) {
@@ -408,18 +420,16 @@ void iota_gfx_task_user(void) {
   snprintf(buf,sizeof(buf), "Undef-%ld", layer_state);
   matrix_write_P(&matrix, PSTR("\n\nLayer: "));
     switch (layer_state) {
-        case _QWERTY:
-        case _COLEMAK:
-        case _DVORAK:
+        case L_BASE:
            matrix_write_P(&matrix, PSTR("Default"));
            break;
-        case _RAISE:
+        case L_RAISE:
            matrix_write_P(&matrix, PSTR("Raise"));
            break;
-        case _LOWER:
+        case L_LOWER:
            matrix_write_P(&matrix, PSTR("Lower"));
            break;
-        case _ADJUST:
+        case L_ADJUST:
            matrix_write_P(&matrix, PSTR("ADJUST"));
            break;
         default: