1 files changed, 17 insertions, 8 deletions
diff --git a/app/usb.c b/app/usb.c
index fc9e6ea..d1fb625 100644
--- a/app/usb.c
+++ b/app/usb.c
@@ -77,16 +77,25 @@ void otg_fs_isr (void)
 }
 
 
-static int control_request (usbd_device *usbd_dev,
-                            struct usb_setup_data *req,
-                            uint8_t **buf,
-                            uint16_t *len,
-                            usbd_control_complete_callback *complete)
+static enum usbd_request_return_codes control_request (usbd_device *usbd_dev,
+    struct usb_setup_data *req,
+    uint8_t **buf,
+    uint16_t *len,
+    usbd_control_complete_callback *complete)
 {
-  if (dfu_control_request (usbd_dev, req, buf, len, complete))
-    return 1;
+  enum usbd_request_return_codes ret;
 
-  return cdcacm_control_request (usbd_dev, req, buf, len, complete);
+  ret = dfu_control_request (usbd_dev, req, buf, len, complete);
+
+  if (ret != USBD_REQ_NEXT_CALLBACK)
+    return ret;
+
+  ret = cdcacm_control_request (usbd_dev, req, buf, len, complete);
+
+  if (ret != USBD_REQ_NEXT_CALLBACK)
+    return ret;
+
+  return USBD_REQ_NOTSUPP;
 }
 
 static void set_config (usbd_device *usbd_dev, uint16_t wValue)