feat(endpoints): clear HID report on endpoint change

This prevents stuck keys when switching endpoints by clearing
everything in the HID report and sending one last report before
switching to the new endpoint.

1 files changed, 11 insertions, 1 deletions

diff --git a/app/src/endpoints.c b/app/src/endpoints.c
index 4f56aa5..3acaba6 100644
--- a/app/src/endpoints.c
+++ b/app/src/endpoints.c
@@ -126,11 +126,21 @@ static enum endpoint get_selected_endpoint() {
     return ENDPOINT_USB;
 }
 
+static void disconnect_current_endpoint() {
+    zmk_hid_keypad_clear();
+    zmk_hid_consumer_clear();
+
+    zmk_endpoints_send_report(USAGE_KEYPAD);
+    zmk_endpoints_send_report(USAGE_CONSUMER);
+}
+
 static int endpoint_listener(const struct zmk_event_header *eh) {
     enum endpoint new_endpoint = get_selected_endpoint();
 
     if (new_endpoint != current_endpoint) {
-        // TODO: send null report on previous endpoint
+        /* Cancel all current keypresses so keys don't stay held on the old endpoint. */
+        disconnect_current_endpoint();
+
         current_endpoint = new_endpoint;
         LOG_INF("Endpoint changed: %d", current_endpoint);
     }