NFC03A1 with Raspberry Pi 4, tag not detecting

[venukrish]

HW : Raspberry PI 4 with NFC03A1 board connected to SPI

SW : Linux_RFAL_st25r95_v2.0.4.tar.gz

we built and we are able to run on the Rpi board, poller example

issue :

ISO1444A tag not detected

SPI seems to be working, we observed IDN command responds with the details as per the datasheet

IRQ_OUT also seems to be correct  refer to log1.txt

rfalInitialize seems to be success. No errros

while ISO14443A tag detection we are observing err timeouts.. refer to log2.txt

pls advise

[Brian TIDAL · Accepted solution]

Hi,

what I see in the trace is:

• line 161: A protocolSelect command is sent to activate the RF field for ISO14443A operations. This command will cause a power consumption increase
• line 181: response 00 00 to the protocolSelect command. The command has been taken into account
• line 191 A Write Analog Config Register is sent. The beginning of the Rx buffer is OK (bytes 0x06) but then the Rx buffer has random values which show something abnormal (lines 200/202/204/206). Thus, it is likely that the extra power consumption due to the RF field activation cannot be satisfied.

I suggest to try to supply both CN6.2 and CN6.4 with 2 different wires from 2 different RPi4 pins. Same for CN6.6 and CN6.7 (GND) to be connected on 2 different GND pins.

Rgds

BT

[venukrish]

Thanks for your inputs Brian. i will check  CN6.2 and CN6.4 with 2 different wires from 2 different RPi4 pins

what about 5v? not required right ? we tried both 3v3 and 5v one at a time.

[Brian TIDAL]

Hi,

5V is not connected. Make sure not to inject 5V on 3V3.

Rgds

BT

[venukrish]

so 5V is not used, only 3.3v is used right.. i did have a look at the schematics and didnot see any +5v connections.

we were able to detect the tag after connecting 2 seperate 3.3v, CN6.2 and CN6.4 ..

i think we missed CN6.2, may be thats the reason why board was not responding...

Appreciate all your inputs. thanks !!