Merge pull request bitcraze#502 from jonasdn/jonasdn/510

Make it clear that fw upgrade not possible using USB

docs/userguides/userguide_client/index.md

@@ -84,6 +84,7 @@ client.
 ### Firmware upgrade
 
 For updating the Crazyflie firmware you can keep being connected to the crazyflie. This will open up a seperate dialog that will guide you through the process.
+Please note that you need to use a Crazyradio dongle to connect to the Crazyflie when doing firmware upgrades. Upgrading using USB is not possible.
 
 ![CFclient bootloading](/docs/images/firmware-upgrade.png)
 

src/cfclient/ui/dialogs/bootloader.py

@@ -176,11 +176,17 @@ def setUiState(self, state):
         elif (state == self.UIState.FW_CONNECTED):
             self._cold_boot_error_message = None
             self.resetButton.setEnabled(False)
-            self.programButton.setEnabled(True)
-            self.setStatusLabel("Connected in firmware mode")
             self.coldBootButton.setEnabled(False)
-            self.setSourceSelectionUiEnabled(True)
             self._helper.connectivity_manager.set_enable(True)
+
+            if self._helper.cf.link_uri.startswith("usb://"):
+                self.programButton.setEnabled(False)
+                self.setStatusLabel("Connected using USB")
+                self.setSourceSelectionUiEnabled(False)
+            else:
+                self.programButton.setEnabled(True)
+                self.setStatusLabel("Connected in firmware mode")
+                self.setSourceSelectionUiEnabled(True)
         elif (state == self.UIState.FW_SCANNING):
             self._cold_boot_error_message = None
             self.resetButton.setEnabled(False)