MAGIC functionality, AG swap in default layout

tmk_core/common/magic.c

@@ -0,0 +1,36 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include <util/delay.h>
+#include "matrix.h"
+#include "bootloader.h"
+#include "debug.h"
+#include "keymap.h"
+#include "host.h"
+#include "action_layer.h"
+#include "eeconfig.h"
+#include "magic.h"
+
+keymap_config_t keymap_config;
+
+void magic(void)
+{
+    /* check signature */
+    if (!eeconfig_is_enabled()) {
+        eeconfig_init();
+    }
+
+    /* debug enable */
+    debug_config.raw = eeconfig_read_debug();
+
+    /* keymap config */
+    keymap_config.raw = eeconfig_read_keymap();
+
+#ifdef NKRO_ENABLE
+    keyboard_nkro = keymap_config.nkro;
+#endif
+
+    uint8_t default_layer = 0;
+    default_layer = eeconfig_read_default_layer();
+    default_layer_set((uint32_t)default_layer);
+
+}