Hello,

When using the D2xx driver it can only be accessed by one handle at a time.

Note that FT245B is Not Recommended for New Designs (NRND) and is being made EOL.
See AN_559 Migrating from FT2xxB however the same limitation applies with the D2xx driver.

There could be other FTDI Community members who have experience with sharing a handle in shared memory but it's not something that FTDI support.

Best Regards,
FTDI Community

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Best Regards,
FTDI Community

Hello,

According to LibMPSSE-SPI User Guide when using our MPSSE library it's possible to run at 30Mhz:

uint32 ClockRate
This parameter takes the value of the clock rate of the SPI bus in hertz. Valid range for ClockRate is 0 to 30MHz.

So you can maybe try with our library which has source code provided for reference.

These also may be useful to you:

AN_114 Interfacing FT2232H Hi-Speed Devices To SPI Bus
AN_180 FT232H MPSSE Example – USB Current Meter using the SPI Interface

Other software examples exist:

https://ftdichip.com/software-examples/mpsse-projects/#usb-to-spi-interface

Also please also note, SPI modes 1 and 3 are not supported with our MPSSE engine.
So please check that your SPI device doesn’t work with these modes.

We also have a support office in Taiwan.

Best Regards,
FTDI Community

Hello,

When using our products in electrically noisy environments, you can try in section 5.1 Adjusting the Reset Pipe Retry Count of AN_107 Advanced Driver Options.

You can also edit the registry, opposed from editing the INF files which breaks driver signing.

Note that registry entry may need to be created:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\FTDIBUS\Parameters\RetryResetCount
The default value is 50 so you can try increasing to see if it has an effect.
This can stop USB disconnects in electrically noisy environments.

The above might be something additional to try to see if it helps, otherwise modify your hardware to cope in electrically noisy environments might be the best way forward and check if you are using a USB certified and shielded cable.

Best Regards,
FTDI Community

Hi Scott,

The only vendor class devices supported by VNC2 are FTDI vendor class devices.

You should have a look at the FT90x series that is made by our sister company Bridgetek. FT90x is a programmable host controller, like VNC2, however it is open source so you can create your own software.

Best Regards
FTDI Community

Hi Yvonne,

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Q: May I ask what's the difference between the PORT_STATE_CONNECTED and PORT_STATE_ENUMERATED?

PORT_STATE_CONNECTED:
Before the USB starts to enter the enumeration process.

PORT_STATE_ENUMERATED:
USB successfully completed the enumeration process.

If the USB enumeration fails, it means that the USB driver cannot operate successfully.

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Q:  However, I used the example code "USBHostHID2" to try to get the same function previously.
In this code, I used the same enumeration function "usbhost_connect_state" as mentioned before.
However, I can only scan data at the very first plugin for the HID device. When I remove the HID device and re-plugin another HID device, the enumeration can fail all the time.

 Sorry, this is the restriction of this sample code.

Q: could the state after doing the usbhost_connect_state function always stay in PORT_STATE_CONNECTED or PORT_STATE_DISCONNECTED?
       
No, it will change according to the actual state of the USB device.

Best Regards

FTDI Community

Hello,

It depends if you are building a static or dynamic application.

.lib is a static library which is linked into an .exe at compile time. Only the .lib is included in the folder.
.dll is a dynamic library that is loaded at runtime. That includes a .lib for the symbols.

Best Regards,
FTDI Community

Hi Yvonne,

I did the same experiment, but I could detect the second HID device successfully.
I've checked our source code and there is nowhere that is actively calling the changeInEnumeration function.
At present, I can only suspect that the possible reason is that there is something wrong with the program you are running, which leads to such strange things happening.

Could you provide us more details, so we can clarify the problem?

Best regards

FTDI Community