Merged Fliphalf, now defined in config, added OLED

Can now use the following in the keymap config.h to call the flipped matrix

```
#define FLIPHALF
```

keyboards/lets_split/rev2/rev2.c

@@ -5,6 +5,13 @@
     float tone_goodbye[][2] = SONG(GOODBYE_SOUND);
 #endif
 
+#ifdef SSD1306OLED
+void led_set_kb(uint8_t usb_led) {
+    // put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
+    led_set_user(usb_led);
+}
+#endif
+
 void matrix_init_kb(void) {
 
     #ifdef AUDIO_ENABLE
@@ -30,3 +37,4 @@ void shutdown_user(void) {
 	stop_all_notes();
     #endif
 }
+

keyboards/lets_split/rev2/rev2.h

@@ -6,23 +6,66 @@
 //void promicro_bootloader_jmp(bool program);
 #include "quantum.h"
 
+
+#ifdef USE_I2C
+#include <stddef.h>
+#ifdef __AVR__
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#endif
+#ifdef SSD1306OLED
+extern bool iota_gfx_init(void);
+extern void iota_gfx_task(void);
+extern bool iota_gfx_off(void);
+extern bool iota_gfx_on(void);
+extern void iota_gfx_flush(void);
+extern void iota_gfx_write_char(uint8_t c);
+extern void iota_gfx_write(const char *data);
+extern void iota_gfx_write_P(const char *data);
+extern void iota_gfx_clear_screen(void);
+#endif
+#endif
+
 //void promicro_bootloader_jmp(bool program);
 
+#ifndef FLIP_HALF
+//Standard Keymap
 #define KEYMAP( \
-	k00, k01, k02, k03, k04, k05, k45, k44, k43, k42, k41, k40, \
-	k10, k11, k12, k13, k14, k15, k55, k54, k53, k52, k51, k50, \
-	k20, k21, k22, k23, k24, k25, k65, k64, k63, k62, k61, k60, \
-	k30, k31, k32, k33, k34, k35, k75, k74, k73, k72, k71, k70 \
+	k40, k41, k42, k43, k44, k45, k05, k04, k03, k02, k01, k00, \
+	k50, k51, k52, k53, k54, k55, k15, k14, k13, k12, k11, k10, \
+	k60, k61, k62, k63, k64, k65, k25, k24, k23, k22, k21, k20, \
+	k70, k71, k72, k73, k74, k75, k35, k34, k33, k32, k31, k30 \
+	) \
+	{ \
+		{ k45, k44, k43, k42, k41, k40 }, \
+		{ k55, k54, k53, k52, k51, k50 }, \
+		{ k65, k64, k63, k62, k61, k60 }, \
+		{ k75, k74, k73, k72, k71, k70 }, \
+		{ k00, k01, k02, k03, k04, k05 }, \
+		{ k10, k11, k12, k13, k14, k15 }, \
+		{ k20, k21, k22, k23, k24, k25 }, \
+		{ k30, k31, k32, k33, k34, k35 } \
+	}
+
+#else
+// Keymap with one side flipped
+#define KEYMAP( \
+	k00, k01, k02, k03, k04, k05, k40, k41, k42, k43, k44, k45, \
+	k10, k11, k12, k13, k14, k15, k50, k51, k52, k53, k54, k55, \
+	k20, k21, k22, k23, k24, k25, k60, k61, k62, k63, k64, k65, \
+	k30, k31, k32, k33, k34, k35, k70, k71, k72, k73, k74, k75 \
 	) \
 	{ \
 		{ k00, k01, k02, k03, k04, k05 }, \
 		{ k10, k11, k12, k13, k14, k15 }, \
 		{ k20, k21, k22, k23, k24, k25 }, \
 		{ k30, k31, k32, k33, k34, k35 }, \
-		{ k40, k41, k42, k43, k44, k45 }, \
-		{ k50, k51, k52, k53, k54, k55 }, \
-		{ k60, k61, k62, k63, k64, k65 }, \
-		{ k70, k71, k72, k73, k74, k75 } \
+		{ k45, k44, k43, k42, k41, k40 }, \
+		{ k55, k54, k53, k52, k51, k50 }, \
+		{ k65, k64, k63, k62, k61, k60 }, \
+		{ k75, k74, k73, k72, k71, k70 } \
 	}
+#endif
+
 
 #endif