FTDI Community

General Category => Discussion - Software => Topic started by: boodoooo on November 26, 2021, 10:46:57 AM

Title: FT201X - How to purge the FX-Buffer
Post by: boodoooo on November 26, 2021, 10:46:57 AM

Im trying to purge the FX-Buffer of the FT201X I2C-Slave. Somehow it seems not to work, the master still reads old data sets even after the purge-function is called. Im using C++(Visual Studio 2019) with the D2XX-functions given in the D2XX-Programmers-Guide.

I did try to use the StopInTask and RestartInTask functions before and after the purge command, but it still does not clear my buffer.
Any help is really appreciated!

Kind regards,
Hendrik

Title: Re: FT201X - How to purge the FX-Buffer
Post by: FTDI Community on November 26, 2021, 03:10:49 PM

Hi ,
Can you try FT_Purge? This function purges receive and transmit buffers in the device.

Regards
FTDI Community

Title: Re: FT201X - How to purge the FX-Buffer
Post by: boodoooo on November 29, 2021, 09:04:01 AM

Hello,

i did try FT_Purge already.

What buffer holds the data coming from the USB-Host? (Data sent via FT_Write)
The FT201X-datasheet has two statements to this, but they are mismatching.

Note that the Transmit buffer is the buffer which holds data which has come from the host computer and is going to be read by the external I2C master.

Data sent from the USB host controller to the I2C interface via the USB data OUT endpoint is stored in the FIFO RX (receive) buffer.

Regards, Hendrik