X-NUCLEO-NFC03A1 not reading tags anymore

[lcopparoni]

Hi everyone,

I'm new to this forum. I'm facing a problem: I'm using the X-NUCLEO-NFC03A1 evaluation board mounted on a NUCLEO-F401RE. I'm also using, with an Arduino UNO, the X-NUCLEO-NFC04A1 tag evaluation board. I'm using the Arduino IDE for now, but since yesterday everything worked great.

I'm able to install the Arduino STM32 library which contains the example code for the NFC03A1 reader. The upload to the board goes fine, and I can see in the console the message asking to press the user button to change mode, or just present an NFC tag to read its content. Now here comes the problem: without changing anything (nor code, nor board, nor the F401RE), suddenly the X-NUCLEO-NFC03A1 has stopped reading tags. If I press the user button in the NUCLEO it does change, and the LEDS on the X-NUCLEO-NFC03A1 power on, but anyway if I present the X-NUCLEO-NFC04A1 tag it does nothing, while some days ago it printed correctly the tag UID and told me there was no NDEF format message (in that case I was using my phone as a tag). As said, now, it doesn't work at all with any tag: nor my phone, nor the X-NUCLEO-NFC04A1, nor with another simple tag which was recognized some days ago.

Since I'm inexperienced I'm really asking if there may be a problem with the board, or I can solve the issue in some way. Thank you

[Brian TIDAL]

Hi,

Can you probe the RF field with a scope to make sure the antenna is not damaged? You can use an oscilloscope probe where you connect the ground wire to the tip (building a loop) and put it in free air close to the tag antenna.

Also, can you connect a logic analyzer on SPI (CLK, SS, MISO, MOSI) + IRQ_IN + IRQ_OUT and send me the trace?

Rgds

BT

[lcopparoni · Accepted solution]

Hi, thanks for the reply. I made some tries and in the end it was a contact problem between pins from the NUCLEO64 and the reader. Everything works now. Thank you!