Hi David
If you right click on the STM Device in dfu mode and select properties.
Go to update driver.
Browse to the install directory for the STM software ( prob in programs x86) and press enter.
That should fix it.
Other thing to check is that the com port assigned to the STM USB driver is correct and not clashing with another in device manager.
Worked for me with W10 on 64 bit machine.
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On 1 Mar 2023, at 12:35 am, David Reams <dwr.kj4de@...> wrote:
?I am still unable to get the nanoVNA to assign a port. I have Windows 10
and the nanoVNA will not automatically assign a port and the program
suggested above does not assign a port. When I place the nanoVNA in DFU
mode it does show "STM Device in DFU Mode". under Universal Serial bus
Controllers. Otherwise it shows "Unknown device" if not in DFU mode. No
port assignment is indicated at all. I might be having a problem with
the nanoVNA equipment itself. When not connected to a PC, the device works
fine.
Maybe this problem can be solved, but if there is, in fact, a problem with
the device, no solution would be forthcoming.
Again, thanks for all of your help!!
David
.
On Tue, Feb 28, 2023 at 1:31?PM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:
On Mon, Feb 27, 2023 at 06:33 PM, David Reams wrote:
Can you give me some more information on the STM boot loader and a
source to
download?
David,
There are two different drivers required when using a NanoVNA-H or
NanoVNA-H4. One is required to get a COMxx: port so that your PC can
exchange data with a NanoVNA. The other driver is required when you want
to do firmware updates on your device.
COM port driver
---------------------
With Windows 10 and Windows 11 the required driver will be installed by
Windows when you connect your NanoVNA to a USB port. With Windows 7 and
Windows 8 you have to manually install the driver and then plug in your
NanoVNA. If Windows 10 fails to install the driver (rarely happens) you
can use the Windows 8 driver. You can check that the driver is working by
plugging in and turning on your NanoVNA and then going into Device Manager
and looking under ports to get the COM port number that has been assigned
If you power off the NanoVNA the COM port should disappear from Device
Manager. I have put a copy of the drivers on my BOX account for you to
download. Here is a link where you can download it >>
Unzip and select the 32 or 64 bit version for your computer.
Firmware Upgrade driver
---------------------------------
This driver is only required when you want to upgrade your firmware. It
does not assign a COM port when the NanoVNA is plugged in and in DFU mode.
DFU mode is activated in different ways depending on your device and the
firmware installed. Old devices had to be put in DFU mode by opening the
case and shorting the Boot0 and DFU pins. In other cases DFU was accessed
by a Menu selection. DFU mode on the -H4 is activated by depressing the
rocker switch down and powering on the anoVNA. When in DFU mode the screen
will be black. You can check that the driver is installed correctly by
looking under USB controllers and seeing if it shows that your device is in
DFU mode (see attached screenshot). I have posted a link to the DfuSe
package on my Box account for you. It will install the DFU driver and the
DfuSe firmware upgrade application.
The Absolute Beginners Guide in the file section of this group tells you
how to install the DFU drivers that are needed for firmware update and how
to install the latest firmware.
/g/nanovna-users/files/Absolute%20Beginner%20Guide%20to%20The%20NanoVNA/Absolute_Beginner_Guide_NanoVNA_v1_6.pdf
You don't have to register to get the DFU program and drivers. I have put
a copy on my Box account for you...
Roger
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