topic Page Write Saved even after failure code in NFC

Page Write Saved even after failure code

eljeffo — Thu, 26 Dec 2019 10:59:48 GMT

When using a CLRC663 to write to an Ultralight EV1 Chip, on occasion I get back error code 0x0201

status = phalMful_Write( pDataParams, Address, Data);

In these cases, I assume I have lost connection with the chip AND that my write is not saved.

However I find that often the write is successful, even though I get back an error status.

How do I interpret status = 0x0201?

Does it mean:

1) Write failed (doubt it)

2) Write maybe failed, but can't be sure (seems like it)

3) Write succeeded, then connection lost (can it be guaranteed?)

4) Write status impossible to determine without reconnection

Re: Page Write Saved even after failure code

IvanRuiz — Fri, 03 Jan 2020 22:37:38 GMT

Hello,

Please share the requested information in thread: https://community.nxp.com/thread/521102

Thank you,

Ivan.

Re: Page Write Saved even after failure code

AlexanderB — Tue, 07 Jan 2020 09:07:18 GMT

Hello @Jeffrey_Chan,

To check error codes look into the file 'ph_Status.h'.

Looking at '0x0201':

0x0200 is the component: PH_COMP_HAL
0x0001 is the error PH_ERR_IO_TIMEOUT /**< No reply received, e.g. PICC removal. */

So it is very likely that the write itself was successful but the response (ACK) hasn't been received and that's why you get a timeout error.

Do answer you question; This would be option "4) Write status impossible to determine without reconnection" because without reading it you don't know what failed.

Has the tag already NOT received your request. --> Nothing written
Has the tag received the frame but with error --> Nothing written
Has the tag recieved the request correct but PCD couldn't receive response (for whatever reason) --> Most probably written, but to be confirmed by reading.

Conclusion: By receiving an error you most likely can assume that the write was NOT successful. To be confirmed by reading back.

Hopefully that answered your question :-)

Best regards,

Alexander

Re: Page Write Saved even after failure code

eljeffo — Tue, 14 Jan 2020 10:03:43 GMT

Thanks Alexander! Appreciate your confirmation!