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ST25R3911B Adds additional one at the beginning of the frame

GBert.3
Associate

Hey there community,

I am trying to set up a active NFCIP-1 communication between two ST25R3911B chips (X-Nucleo-NFC05A1 Board).

I was able to get the communication running without the library (because I can not use it in the following project), in about 50% of the cases the communication just worked fine. But in the other half an additional "one" is added to the frame, which shifts the entire frame to the right and cause a not reversible data corruption.

The 0xF0 startbyte become 0xF8 and so on. A simple left shift over the entire frame does not restore the data properly.

I think the problem is on the target side, but can also be wrong. Does anyone get the same issue and may give me an advice to fix it?

The target function runs as a state machine which is called periodically, the initiator function is called with a 1s delay between.

Thank you for your time!

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