CR95HF: Intermittent Invalid Protocol - 0x83

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Hello Folks,

We intermittently see an "invalid protocol - 0x83' error while reading data.

send_cmd 0x04 0x04 0x16 0x00 0x00 0x00

rcv_hdr 0x83 0x00

This happens intermittently and I have not been successful in reproducing the error.

Usually a restart or connect helps to resolve the error.

Any pointers on what is causing the error and how to reproduce it on a testing environment?

Best Regards,

Abhi.

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Brian TIDALBest answer

ST Technical Moderator

Hi Abhi,

can you provide more information about the firmware being used:

is it based on RFAL from X-CUBE-NFC3 (or from ST25 Embedded NFC library) or is it a custom firmware implementing the commands from the datasheet?
do you use SPI or UART interface?
do you use the IRQ_OUT or SPI polling mechanism for reading response from the CR95HF?
on MCU side, do you use a RTOS with different tasks accessing the CR95HF?

I suspect that sometimes the SendRcvd command is used while the protocol has been reset to field off.

Can you connect a logic analyser on SPI (CLK, SS, MISO, MOSI) +IRQ_OUT and provide a trace?

Rgds

BT

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