3 files changed, 17 insertions, 1 deletions
diff --git a/app/include/zmk/hid.h b/app/include/zmk/hid.h
index 744de98..04b12e1 100644
--- a/app/include/zmk/hid.h
+++ b/app/include/zmk/hid.h
@@ -165,9 +165,11 @@ int zmk_hid_register_mods(zmk_mod_flags modifiers);
 int zmk_hid_unregister_mods(zmk_mod_flags modifiers);
 int zmk_hid_keypad_press(zmk_key key);
 int zmk_hid_keypad_release(zmk_key key);
+void zmk_hid_keypad_clear();
 
 int zmk_hid_consumer_press(zmk_key key);
 int zmk_hid_consumer_release(zmk_key key);
+void zmk_hid_consumer_clear();
 
 struct zmk_hid_keypad_report *zmk_hid_get_keypad_report();
 struct zmk_hid_consumer_report *zmk_hid_get_consumer_report();
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);
     }
diff --git a/app/src/hid.c b/app/src/hid.c
index f80906c..8f6c388 100644
--- a/app/src/hid.c
+++ b/app/src/hid.c
@@ -94,6 +94,8 @@ int zmk_hid_keypad_release(zmk_key code) {
     return 0;
 };
 
+void zmk_hid_keypad_clear() { memset(&kp_report.body, 0, sizeof(kp_report.body)); }
+
 int zmk_hid_consumer_press(zmk_key code) {
     TOGGLE_CONSUMER(0U, code);
     return 0;
@@ -104,6 +106,8 @@ int zmk_hid_consumer_release(zmk_key code) {
     return 0;
 };
 
+void zmk_hid_consumer_clear() { memset(&consumer_report.body, 0, sizeof(consumer_report.body)); }
+
 struct zmk_hid_keypad_report *zmk_hid_get_keypad_report() {
     return &kp_report;
 }