Communication with FT2232D

[Ih3b]

Hello guys,

I'm utilizing an EVK-ANNA-B402 module, which includes an nRF52833 microcontroller with Zephyr OS, and I'm exploring ways to enable bidirectional communication with an FT2232D device over USB. Has anyone successfully achieved this?

The FT2232D belongs to the Vendor-Specific USB class and cannot be used with the CDC-USB class. Therefore, I am exploring alternatives and the development of a driver for the FT2232D appears to be quite complex :c

Here is the device I need to communicate with :

Any assistance would be greatly appreciated !

Thank you in advance!

[hmolesworth]

Alternative solution: Cut the Device UART Rx input trace from the FT22320 Tx output; connect 3 pins from EVK-ANNA-B402 to Device: name them Rx, Tx, Gnd. Use a UART on the nRF52833 to drive those lines.

[Ih3b]

Is it possible to interface my SIP ( which contains the nRF52833)  with the MAX3421E IC, as discussed here?  What should I do to make nRF52840 to be a USB host?

[Ih3b]

Hello Vidar Berg , Is there any library available for the MAX3421E that would enable easy communication with my FT2232D via SPI on Zephyr? I'm finding it difficult to understand how USB samples could function when built with the MAX3421E shield as you said ?

Any help please :( ?

[Vidar Berg]

Hello,

You can test the shield using the USB shell sample. However, please note that the USB stack and configuration used here have experimental support.

Building the sample with the sparkfun shield in VS code

[Ih3b]

Thanks Vidar Berg , do you have any idea why the main.c of that sample is empty on github ?

https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/usb/shell

[Vidar Berg]

The USB shell commands are registered in usbd_shell.c here:

The registration occurs at startup before the program reaches main().

You can also find the MAX3421E driver here:

[Ih3b]

Thank you Vidar Berg  , However, the FTDI chip won't send me any data until I configure its line properties (parity, stop bits, etc.) and baud rate using FTDI's custom commands.

How can I send and receive data from the device connected to the MAX3421E?

I apologize, but I'm planning to purchase all the required hardware, which is why I'm trying to gather all the necessary information to ensure the feasibility and speed of development

[Turbo J]

The very complex communication between the FTDI chip and the MAX seems very much out-of-scope for this forum here.

Last time I checked there was some documentation for the protocol on ftdichip.com website available - but this requires that the user understands how an USB host works IIRC.

[Ih3b]

Thank you, everyone, for your support. I'll keep you all updated as I acquire the necessary hardware and begin implementing the solution. Here's hoping everything goes smoothly :-)