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Author Topic: FTD2XX: What do FT_GetVIDPID and FT_SetVIDPID do?  (Read 105 times)

mcmayer

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FTD2XX: What do FT_GetVIDPID and FT_SetVIDPID do?
« on: January 15, 2019, 02:01:01 PM »

The D2XX library has two functions FT_SetVIDPID and FT_GetVIDPID (I refer to the D2XX Programmer's Guide https://www.ftdichip.com/Support/Documents/ProgramGuides/D2XX_Programmer's_Guide(FT_000071).pdf).

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FT_GetVIDPID retrieves the current VID and PID combination from within the internal device list table.

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FT_SetVIDPID includes a custom VID and PID combination within the internal device list table.

Although it's not explilictly stated I think what's going on is this:
The D2XX library has a list of VID/PID combinations that it uses to select devices from the the scan. With FT_SetVIDPID VID/PID combinations can be appended to that list. FT_GetVIDPID retrieves the first (?) item in the list, and therefore never changes.

Am I getting this right?

It's somewhat counter-intuitive because FT_GetVIDPID is basically pointless. The returned value never changes.
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FTDI Community

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Re: FTD2XX: What do FT_GetVIDPID and FT_SetVIDPID do?
« Reply #1 on: January 18, 2019, 04:53:43 PM »

Hello,

These functions are specifically for MAC OS and Linux.

You are right, FT_GetVIDPID has been deprecated.

FT_SetVIDPID can be used to set multiple custom VID/PID combinations which need to use the FTDI driver.

Best Regards,
FTDI Community
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