FTDI Community

Please login or register.

Login with username, password and session length.
Advanced Search  


Welcome to the FTDI Community!

Please read our Welcome Note

Technical Support enquires
please contact the team
@ FTDI Support

New Bridgetek Community is now open

Please note that we have created the Bridgetek Community to discuss all Bridgetek products e.g. EVE, MCU.

Please follow this link and create a new user account to get started.

Bridgetek Community

Author Topic: Cannot find FT4222 chip on Windows  (Read 2427 times)


  • Newbie
  • *
  • Posts: 2
    • View Profile
Cannot find FT4222 chip on Windows
« on: May 07, 2018, 08:32:49 PM »

I'm still working on debugging my other issue (http://www.ftdicommunity.com/index.php?topic=83.0).  While I was able to detect the FT4222 chip on my Mac OS X machine, when I built the software on Windows 10, I cannot see it.

To reduce any issues with my code, I'm using the i2c_master example.  In the code, after the call to:
Code: [Select]
FT_STATUS status = FT_CreateDeviceInfoList(&numOfDevices);
numOfDevices is always 0.

However, when I look at the Windows Device Manager, I do see a "FT4222H Mode 3 Device" entry in the "Universal Serial Bus controllers" section.

I installed the D2xx drivers (http://www.ftdichip.com/Drivers/D2XX.htm) using the Windows setup executable. Can you help me detect this device in my code?

FTDI Community

  • Administrator
  • Sr. Member
  • *****
  • Posts: 423
    • View Profile
Re: Cannot find FT4222 chip on Windows
« Reply #1 on: May 08, 2018, 11:32:16 AM »


There should be no problems running the example code provided with the library.

Does the same thing happen on a different Windows PC?

Please ensure that you are using the latest version LibFT4222 Windows Library (v1.4.1) and Examples.

Mode 3 is the correct mode for using the device as 1 port for data stream (I2C or SPI) as per Table 5.1 in the FT4222H Datasheet.

You could try completely uninstalling and reinstalling the FTDI drivers. See FTDI_Driver_Uninstall_with_2-12-28_Install.pdf for details on how to do this.

Best Regards,
FTDI Community
« Last Edit: September 13, 2019, 03:20:04 PM by FTDI Community »