[Keyboard] Add the [n]40-o (#11286)

* Create Alter folder

* Revert "Create Alter folder"

This reverts commit 361103b821dbb22957b66cdedb0d11f996def71c.

* Added the n40_o folder

* Edited info.json, n40_o.h and rules.mk

* Edited readme as per comment

1 files changed, 51 insertions, 0 deletions

diff --git a/keyboards/nightly_boards/n40_o/encoder_action.c b/keyboards/nightly_boards/n40_o/encoder_action.c
new file mode 100644
index 0000000000..042a3871c9
--- /dev/null
+++ b/keyboards/nightly_boards/n40_o/encoder_action.c
@@ -0,0 +1,51 @@
+/* Copyright 2020 Neil Brian Ramirez
+ *
+ * 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 3 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 "encoder_action.h"
+
+#ifdef ENCODERS
+static uint8_t encoder_state[ENCODERS] = {0};
+static keypos_t encoder_cw[ENCODERS] = ENCODERS_CW_KEY;
+static keypos_t encoder_ccw[ENCODERS] = ENCODERS_CCW_KEY;
+#endif
+
+void encoder_action_unregister(void) {
+#ifdef ENCODERS
+    for (int index = 0; index < ENCODERS; ++index) {
+        if (encoder_state[index]) {
+            keyevent_t encoder_event = (keyevent_t) {
+                .key = encoder_state[index] >> 1 ? encoder_cw[index] : encoder_ccw[index],
+                .pressed = false,
+                .time = (timer_read() | 1)
+            };
+            encoder_state[index] = 0;
+            action_exec(encoder_event);
+        }
+    }
+#endif
+}
+
+void encoder_action_register(uint8_t index, bool clockwise) {
+#ifdef ENCODERS
+    keyevent_t encoder_event = (keyevent_t) {
+        .key = clockwise ? encoder_cw[index] : encoder_ccw[index],
+        .pressed = true,
+        .time = (timer_read() | 1)
+    };
+    encoder_state[index] = (clockwise ^ 1) | (clockwise << 1);
+    action_exec(encoder_event);
+#endif
+}