Hello,

Virtual COM port (VCP) drivers cause the USB device to appear as an additional COM port available to the PC.  Application software can access the USB device in the same way as it would access a standard COM port.

D2XX drivers allow direct access to the USB device through a DLL.  Application software can access the USB device through a series of DLL function calls.  The functions available are listed in the D2XX Programmer's Guide document which is available from the Documents section of this site.

Unfortunately you can't communicate over SPI through VCOM interface. LibMPSSE and the MPSSE Engine can only be configured via the D2XX drivers.

Best Regards,
FTDI Community

Hello,

I believe this project will be able to help you https://www.ftdichip.com/Support/Documents/AppNotes/AN_195_Vinculum-II_UART_to_SPI_Master_Bridge.pdf.This demonstration application will bridge a VNC2 UART to the VNC2 SPI Master for controlling SPI slave devices. Data is transferrable in both directions.

The default SPI master parameters are SPI mode 0 with a 50kHz clock. Data will be sent MSB first.
The file may be used on 32, 48 or 64 pin packages.

also you should have a look at https://ftdichip.com/wp-content/uploads/2020/08/AN_142_Vinculum-II_Tool_Chain_Getting_Started_Guide.pdf.

all of our VNC2 documentation can be found on the product page, under the documents tab https://ftdichip.com/products/vnc2-48q1c/ .

Best Regards

FTDI Community

Hi Gregg,

Don’t do this – OE needs to be controlled by a separate signal from the downstream FPGA.

RD# needs to be throttled by the FPGA according to the state of the RXF# flag.

could you please fill out the attached survey form?

Best Regards

FTDI Community

Hi,

all the CBUS pins are programmable through FT_PROG, https://ftdichip.com/wp-content/uploads/2020/08/AN_124_User_Guide_For_FT_PROG.pdf. Section 2.4 of the FT232H datasheet shows the ACBUS signal options https://ftdichip.com/wp-content/uploads/2020/07/DS_FT232H.pdf.

however, they can only be controlled when the device is in UART mode.

Best Regards,

FTDI Community

Hello,

LibMPSSE can't be used with UMFT201XB as the FT201X does not have an MPSSE Engine inside.

FT232H, FT2232H and FT4232H can be used with LibMPSSE.
Note that these can be I2C masters only.

FT201X can only be an I2C slave.

You may be interested in AN_255_USB to I2C Example using the FT232H and FT201X devices.
The software can be downloaded here:
https://ftdichip.com/wp-content/uploads/2020/07/AN_255-Files.zip

Best Regards,
FTDI Community

Hello,

what version of Linux are you using? our Linux VCP drivers can be downloaded from our website https://ftdichip.com/drivers/vcp-drivers/.

are you sure that the FT4232H mini module being powered correctly? depending on the power configuration you are using, there are some external connections needed. Section 3 of the module datasheet explains this https://ftdichip.com/wp-content/uploads/2020/07/DS_FT4232H_Mini_Module.pdf.

Best Regards,

FTDI Community.

Hi,
What version of LibMPSSE are you using?  The latest version of libMPSSE is v0.6:
https://ftdichip.com/software-examples/mpsse-projects/libmpsse-spi-examples/

You could add debug commands to try and figure out where the delays are, Another option is not to use libMPSSE and use the d2xx drivers direct:

To use I2C/SPI as a master, see AN_135 - MPSSE Basics and our existing MPSSE Example projects:
https://ftdichip.com/wp-content/uploads/2020/08/AN_135_MPSSE_Basics.pdf
https://ftdichip.com/software-examples/mpsse-projects/

There are two options to use I2C/SPI modes with the MPSSE engine:
 
a.   Use LibMPSSE libraries. Example code is provided with the download.
b.   Use D2XX drivers direct.  AN_108 provides the necessary information
https://ftdichip.com/wp-content/uploads/2020/08/AN_108_Command_Processor_for_MPSSE_and_MCU_Host_Bus_Emulation_Modes.pdf

Regards
FTDI Community 

Hello,

It sounds like there are hardware issues with your custom PCB.

Details on PWREN#:

Active low power-enable output.
PWREN# = 0: Normal operation.
PWREN# =1: USB SUSPEND mode or device has not been configured.

Please contact your local support office and we can review your schematics:

https://ftdichip.com/technical-support/

We do also have FT2232H based hardware that you can use for test, evaluation and reference.
Scroll down to products found here:

https://ftdichip.com/?s=ft2232h&post_type=product

Best Regards,
FTDI Community