RFID Read not working after MCU migration

[Yves Bmnt]

Hi,

I changed the MCU on my design from STM32 L031 to L051 & L052 to have more flash then have a DAC output.

I kept exactly the same ST supplied libraries / APIs for the RFID part, and command them in the exact same way with all MCUs.

SPI to RFID chip runs @4Mbit/s.

My design is using the ST25r3911 for RFID in NFCV / 15693 standard.

Allthough the RFID works perfectly on the old design with L031, the RFID read returns a CRC error on the other 2.

The tag detect, ID read & single block write work fine though.

(The PCB design is exactly the same for the L031 and L051, only changed for L052 to add more functionalities)

Could anyone help please?

Kind regards,

Yves

[Andrew Neil]

Please show your schematics; also, what tools (including versions) are you using?

How to write your question to maximize your chances to find a solution

A change of tools (or tool versions) could cause timing variations, and might awake latent bugs.

Have you used an oscilloscope on the new hardware to verify signal integrity - levels, clean edges, noise, etc ?

Have you used an analyser to verify the actual comms on the wire ?

Compare & contrast the working & non-working cases.

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@Yves Bmnt wrote:

the RFID read returns a CRC error

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Is that in your software, or the reader itself ?

Again, compare & contrast the working & non-working cases.