STW81200-EVB GUI Connection Issue: Device ID Reads as 0xFF, No SPI Activity Observed

[sabankocal]

Hi,
I am using your official GUI to read and write registers on the STW81200-EVB.
While the GUI initially indicates that it is connected, I am unable to read the Device ID or write any configuration data. You can find logs of your GUI as attachment.
Below is a summary of what I have tried and my current suspicions:

Steps I Have Tried:

1. Powered the board using:
   - USB
   - External power(Switch S1 is switched to A=EXT)
2. Changed the U5 jumper between the 4V5 and VCC positions.
3. Uninstalled and reinstalled both the GUI software and the FTDI driver.
4. Restarted the PC, used different USB ports and cables, and even tested on a second PC.

Current Issues:

• At startup, the GUI displays: "USB connection is OK."
• Read operations: No errors are shown, but the Device ID is always 0xFF (suggesting an issue with the MISO line).
• Write operations: An error appears: "Uncorrect device ID... Exiting. Tip: power supply might be disconnected."
• The 100 MHz clock is present at top right side of the crystal.
• The Locked LED never turns on, unlike a previous board I tested.
• The GUI states that the board is "Locked," but the LED indicates otherwise.
• I probed the SPI lines using both a logic analyzer and an oscilloscope but observed no signal changes on any line.

Suspected Issue:

I suspect the FTDI board might not be functioning correctly!!!

[sabankocal]

Hello,

It’s been a week since I posted about my evaluation board issue, and I haven’t received a response. Could you please provide an update or let me know if further details are needed?

Thank you!

[Binggee130]

I have same problem with STUW81300 EVB.

Mark

[Binggee130]

Hi.I think I solved the problem.

I checked the FTDI driver version in the device manager. It's Ver 2021.

But FTDI driver version is Ver 2015 in STSW-RFSOL003 - 2.0.

It may have compatibility issues with Win11.

I uninstalled all FTDI drivers，then restarted the system and disabled forced driver signing.

After reinstalling the FTDI driver, STuW81300GUI-v2.0 can correctly read the device ID of EVB. It can also be written to all registers, and EVB is locked