Add mdbt50q rx button listener

Author: kot149

boards/shields/roBa/roBa.dtsi

@@ -144,3 +144,9 @@
         gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
     };
 };
+
+/ {
+    mdbt50q_rx_buttons: buttons {
+        status = "disabled";
+    };
+};

boards/shields/roBa/roBa_dongle.conf

@@ -18,6 +18,8 @@ CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_PROXY=y
 CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING=y
 
 CONFIG_INPUT=y
+CONFIG_INPUT_GPIO_KEYS=y
+CONFIG_INPUT_THREAD_STACK_SIZE=2048
 
 CONFIG_ZMK_STUDIO=y
 CONFIG_ZMK_STUDIO_LOCKING=n

boards/shields/roBa/roBa_dongle.overlay

@@ -24,3 +24,7 @@
 &trackball_listener {
     status = "okay";
 };
+
+&mdbt50q_rx_buttons {
+    status = "okay";
+};

config/roBa.keymap

@@ -53,6 +53,26 @@
 
 &sl { release-after-ms = <1000>; };
 
+/ {
+    input_processors {
+        zip_button_to_key: zip_button_to_key {
+            compatible = "zmk,input-processor-behaviors";
+            #input-processor-cells = <0>;
+            type = <INPUT_EV_KEY>;
+            codes    = <INPUT_KEY_0>;
+            bindings = <&reset_bootloader 0 0>;
+        };
+    };
+
+    mdbt50q_rx_buttons_listener: mdbt50q_rx_buttons_listener {
+        compatible = "zmk,input-listener";
+        status = "okay";
+        device = <&mdbt50q_rx_buttons>;
+
+        input-processors = <&zip_button_to_key>;
+    };
+};
+
 &mouse_gesture_kp {
     tapping-term-ms = <200>;
     quick-tap-ms = <250>;