Hello. I am using F28035 as PMBus Master device and trying to communicate with UCD. I can read data but can't write it. Any advice?
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If you are in ROM mode, perhaps you are not using a PEC at the end of your messages. You will still be able to do a read, but not a write command.
If that's not the issue, then please give us some more information about specifically what messages you are writing and what you are seeing.
For an additional debugging approach, I suggest that you use the USB to GPIO adapter with the GUI, and try that and verify that it works. Then look with a scope to see what the differences are between what your F28035 is sending vs the USB to GPIO.