Connect NanoVNA-H to Windows 7 Machine and Assign COM Port

[rpi-maker]

Updated firmware on NanoVNA-H to current version 1.0.70, Windows 7 shows "ChibiOS/RT Virtual COM Port" under Universal Serial Bus devices, but won't assign an actual COM Port Number under Ports (COM & LPT) in Windows Computer Management - Device Manager.

Running Windows 7 Professional with SP1
Installed Microsoft Visual C++ Redistributable packages
Successfully Installed STSW-STM32102 - STM32 Virtual COM Port Driver (VCP_V1.5.0_Setup_W7_x64_64bits.exe)

Trying to connect to NanoVNA-Saver, but wont connect without a COM port assigned
https://github.com/NanoVNA-Saver/nanovna-saver

Any help would be appreciated, maybe an issue with the firmware or need a specific Windows 7 driver?

Also, possibly related to the following issue:

"Cannot connect via USB immediately after plugging in" #58

NanoVNA-H USB Connection Details on Windows 7 Machine
=========================== USB Port8 ===========================

Connection Status : 0x01 (Device is connected)
Port Chain : 1-1-8

  ========================== Summary =========================

Vendor ID : 0x0483 (STMicroelectronics)
Product ID : 0x5740
USB Version : 1.10
Port maximum Speed : High-Speed
Device maximum Speed : Full-Speed
Device Connection Speed : Full-Speed
Self powered : yes
Demanded Current : 100 mA
Used Endpoints : 4

  ======================== USB Device ========================

    +++++++++++++++++ Device Information ++++++++++++++++++

Device Description : ChibiOS/RT Virtual COM Port
Device Path 1 : \?\USB#VID_0483&PID_5740#400#{a5dcbf10-6530-11d2-901f-00c04fb951ed} (GUID_DEVINTERFACE_USB_DEVICE)
Device Path 2 : \?\USB#VID_0483&PID_5740#400#{f445ae01-1799-49a0-b833-8ebf2fec9ebb}
Kernel Name : \Device\USBPDO-7
Device ID : USB\VID_0483&PID_5740\400
Hardware IDs : USB\VID_0483&PID_5740&REV_0200 USB\VID_0483&PID_5740
Driver KeyName : {88bae032-5a81-49f0-bc3d-a4ff138216d6}\0014 (GUID_DEVCLASS_USBDEVICE)
Driver : system32\DRIVERS\WinUsb.sys (Version: 6.1.7601.17514 Date: 2010-11-20)
Driver Inf : C:\Windows\inf\oem117.inf
Legacy BusType : PNPBus
Class : USBDevice
Class GUID : {88bae032-5a81-49f0-bc3d-a4ff138216d6} (GUID_DEVCLASS_USBDEVICE)
Service : WinUSB
Enumerator : USB
Location Info : Port_#0008.Hub_#0003
Location IDs : PCIROOT(0)#PCI(1D00)#USBROOT(0)#USB(1)#USB(8)
Container ID : {760c3622-4a59-596d-bacb-13523c1ebcfe}
Manufacturer Info : STMicroelectronics
Capabilities : 0x14 (Removable, UniqueID)
Status : 0x0180600A (DN_DRIVER_LOADED, DN_STARTED, DN_DISABLEABLE, DN_REMOVABLE, DN_NT_ENUMERATOR, DN_NT_DRIVER)
Problem Code : 0
HcDisableSelectiveSuspend: 0
EnableSelectiveSuspend : 0
SelectiveSuspendEnabled : 0
EnhancedPowerMgmtEnabled : 0
IdleInWorkingState : 0
WakeFromSleepState : 0
Power State : D0 (supported: D0, D2, D3, wake from D0, wake from D2)

    ---------------- Connection Information ---------------

Connection Index : 0x08 (Port 8)
Connection Status : 0x01 (DeviceConnected)
Current Config Value : 0x01 (Configuration 1)
Device Address : 0x08 (8)
Is Hub : 0x00 (no)
Device Bus Speed : 0x01 (Full-Speed)
Number Of Open Pipes : 0x03 (3 pipes to data endpoints)
Pipe[0] : EndpointID=2 Direction=IN ScheduleOffset=5 Type=Interrupt
Pipe[1] : EndpointID=1 Direction=OUT ScheduleOffset=0 Type=Bulk
Pipe[2] : EndpointID=1 Direction=IN ScheduleOffset=0 Type=Bulk
Data (HexDump) : 08 00 00 00 12 01 10 01 02 00 00 40 83 04 40 57 ...........@..@W
00 02 01 02 03 01 01 01 00 08 00 03 00 00 00 01 ................
00 00 00 07 05 82 03 08 00 FF 05 00 00 00 07 05 ................
01 02 40 00 00 00 00 00 00 07 05 81 02 40 00 00 ..@..........@..
00 00 00 00 ....

---------------------- Device Descriptor ----------------------

bLength : 0x12 (18 bytes)
bDescriptorType : 0x01 (Device Descriptor)
bcdUSB : 0x110 (USB Version 1.10)
bDeviceClass : 0x02 (Communications and CDC Control)
bDeviceSubClass : 0x00
bDeviceProtocol : 0x00 (No class specific protocol required)
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x0483 (STMicroelectronics)
idProduct : 0x5740
bcdDevice : 0x0200
iManufacturer : 0x01 (String Descriptor 1)
Language 0x0409 : "STMicroelectronics"
iProduct : 0x02 (String Descriptor 2)
Language 0x0409 : "ChibiOS/RT Virtual COM Port"
iSerialNumber : 0x03 (String Descriptor 3)
Language 0x0409 : "400"
bNumConfigurations : 0x01 (1 Configuration)
Data (HexDump) : 12 01 10 01 02 00 00 40 83 04 40 57 00 02 01 02 .......@..@W....
03 01 ..

------------------ Configuration Descriptor -------------------

bLength : 0x09 (9 bytes)
bDescriptorType : 0x02 (Configuration Descriptor)
wTotalLength : 0x0043 (67 bytes)
bNumInterfaces : 0x02 (2 Interfaces)
bConfigurationValue : 0x01 (Configuration 1)
iConfiguration : 0x00 (No String Descriptor)
bmAttributes : 0xC0
D7: Reserved, set 1 : 0x01
D6: Self Powered : 0x01 (yes)
D5: Remote Wakeup : 0x00 (no)
D4..0: Reserved, set 0 : 0x00
MaxPower : 0x32 (100 mA)
Data (HexDump) : 09 02 43 00 02 01 00 C0 32 09 04 00 00 01 02 02 ..C.....2.......
00 00 05 24 00 10 01 05 24 01 00 01 04 24 02 02 ...$....$....$..
05 24 06 00 01 07 05 82 03 08 00 FF 09 04 01 00 .$..............
02 0A 00 00 00 07 05 01 02 40 00 00 07 05 81 02 .........@......
40 00 00 @..

    ---------------- Interface Descriptor -----------------

bLength : 0x09 (9 bytes)
bDescriptorType : 0x04 (Interface Descriptor)
bInterfaceNumber : 0x00
bAlternateSetting : 0x00
bNumEndpoints : 0x01 (1 Endpoint)
bInterfaceClass : 0x02 (Communications and CDC Control)
bInterfaceSubClass : 0x02 (Abstract Control Model)
bInterfaceProtocol : 0x00 (No class specific protocol required)
iInterface : 0x00 (No String Descriptor)
Data (HexDump) : 09 04 00 00 01 02 02 00 00 .........

[rpi-maker]

I solved this myself. Ended up using Zadig to replace the drivers for the "ChibiOS/RT Virtual COM Port". For others with the same problem, try the following:

1. Install Microsoft Visual C++ Redistributable packages
2. Install STSW-STM32102 - STM32 Virtual COM Port Driver (VCP_V1.5.0_Setup_W7_x64_64bits.exe) from https://www.st.com/en/development-tools/stsw-stm32102.html
3. In Zadig - Options - List All Devices.
4. In Zadig - Select "ChibiOS/RT Virtual COM Port" device in the drop down list
5. In Zadig - Select "USB Serial (CDC)" as the replacement driver
6. In Zadig - Upgrade Driver
7. Verify Windows Computer Management - Device Manager assigned a COM Port # for the NanoVNA
8. Open NanoVNA-Saver - Serial Port Control (lower left) should show COM Port # assigned to NanoVNA (for me "COM16 (NanoVNA)" is listed)
9. NanoVNA-Saver - Serial Port Control - Connect to Device

Hope this helps someone else get NanoVNA-Saver up and running with the current firmware.