LabVIEW FTDI MPSSE I2C DeviceRead always returning 0xFF

[Arj]

Hi

I am using the MPSSE I2C drivers over a USB FT232H device, communicating with BMP280.  When I read the BMP280 device ID, it is supposed to return 0x58 but the DeviceRead vi returns 0xFF.  I have used a logic analyser and can confirm that the device is actually sending 0x58, but the output from the read vi is 0xFF.  Has anyone had this same problem, or can anyone suggest what might be the issue?

Thanks

Arj

Edited March 18, 2023 by Arj
Typo

[Arj]

An update: No matter what register I am trying to read in the BMP280, it returns the correct value on the logic analyser, but the DeviceRead vi always reads 0xFF

[gammaray]

Hi,

It was long ago when you asked. You've probably already solved it. I just started using the FT2232H in LabVIEW and noticed your question. Connect the DO and DI pins to each other and it will work.

[gammaray]

By the way, this library is a bit weird.I haven't been able get the master yet to send an ACK when reading, if more bytes need to be read and a NAK after the last byte has received.

Edited 1 hour ago by gammaray