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Error reading tag with ST25R3911B with ST code

Question asked by Yves Bmnt on Jun 7, 2018
Latest reply on Jun 7, 2018 by Yves Bmnt



I am using the code supplied by ST for the X-NUCLEO-NFC05A1, with a different processor (STM32L031) than on the demo NUCLEO board, to control the ST25R3911 with ISO15693.

This code comes from the example STM32CubeExpansion_NFC5_v1.0.0.

Seems I have something wrong because I always get the error ERR_IO when trying to detect a tag.

Comments in code say: 

/* REMARK: Silicon workaround ST25R3911 Errata #TBD */
/* ST25R3911 may indicate RXE without RXS previously, this happens upon some */
/* noise or incomplete byte frames with less than 4 bits */


I haven't been able to figure out why I get this error so far, although if I plug directly the demo board processor to my RFID reader board with SPI bus + IRQ signal, everything works fine.

With my board, RFAL initialisation works fine, it seems my controller communicates well with the RFID reader, but then I get this error. The antenna seems to emit the right signal too.


Any help would be welcome