3 files changed, 12 insertions, 6 deletions
diff --git a/keyboards/crkbd/keymaps/madhatter/config.h b/keyboards/crkbd/keymaps/madhatter/config.h
index 899fde008d..bcf4e05005 100644
--- a/keyboards/crkbd/keymaps/madhatter/config.h
+++ b/keyboards/crkbd/keymaps/madhatter/config.h
@@ -29,6 +29,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // #define EE_HANDS
 
 #define SSD1306OLED
+#define USE_SSD_I2C
 
 #define USE_SERIAL_PD2
 
diff --git a/keyboards/crkbd/keymaps/madhatter/keymap.c b/keyboards/crkbd/keymaps/madhatter/keymap.c
index 57a522deb4..c228a7b573 100644
--- a/keyboards/crkbd/keymaps/madhatter/keymap.c
+++ b/keyboards/crkbd/keymaps/madhatter/keymap.c
@@ -17,8 +17,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include QMK_KEYBOARD_H
-
-extern uint8_t is_master;
+#ifdef SSD1306OLED
+#    include "ssd1306.h"
+#    include <string.h>
+#endif
 
 enum corny_layers {
   _QWERTY,
@@ -108,7 +110,7 @@ void matrix_init_user(void) {
     #endif
     //SSD1306 OLED init, make sure to add #define SSD1306OLED in config.h
     #ifdef SSD1306OLED
-        iota_gfx_init(!has_usb());   // turns on the display
+        iota_gfx_init();   // turns on the display
     #endif
 }
 
@@ -132,10 +134,10 @@ void matrix_scan_user(void) {
 }
 
 void matrix_render_user(struct CharacterMatrix *matrix) {
-  if (is_master) {
+  if (is_keyboard_master()) {
     // If you want to change the display of OLED, you need to change here
-    matrix_write_ln(matrix, read_layer_state());
-    matrix_write_ln(matrix, read_keylog());
+    matrix_write(matrix, read_layer_state());
+    matrix_write(matrix, read_keylog());
     //matrix_write_ln(matrix, read_keylogs());
     //matrix_write_ln(matrix, read_mode_icon(keymap_config.swap_lalt_lgui));
     //matrix_write_ln(matrix, read_host_led_state());
diff --git a/keyboards/crkbd/keymaps/madhatter/rules.mk b/keyboards/crkbd/keymaps/madhatter/rules.mk
index f84e5b2af8..489b16ef1c 100644
--- a/keyboards/crkbd/keymaps/madhatter/rules.mk
+++ b/keyboards/crkbd/keymaps/madhatter/rules.mk
@@ -8,3 +8,6 @@ SRC +=  ./lib/glcdfont.c \
         # ./lib/mode_icon_reader.c \
         # ./lib/host_led_state_reader.c \
         # ./lib/timelogger.c \
+
+VPATH += keyboards/crkbd/lib
+LIB_SRC += ssd1306.c i2c.c