[Keyboard] EXT65 rev3 support (#18873)

keyboards/aeboards/ext65/rev3/rev3.c

@@ -0,0 +1,38 @@
+/* Copyright 2022 Harrison Chan (Xelus)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "rev3.h"
+
+// Tested and verified working on EXT65 Rev3
+void matrix_io_delay(void) { __asm__ volatile("nop\nnop\nnop\n"); }
+
+void keyboard_pre_init_user(void) {
+  // Call the keyboard pre init code.
+  // Set our LED pins as output
+  setPinOutput(LED_LAYERS_PIN);
+}
+
+layer_state_t layer_state_set_kb(layer_state_t state) {
+    switch (get_highest_layer(state)) {
+      case 1:
+        writePinHigh(LED_LAYERS_PIN);
+        break;
+      default: //  for any other layers, or the default layer
+        writePinLow(LED_LAYERS_PIN);
+        break;
+      }
+    return layer_state_set_user(state);
+}