PN7150 reduce power to avoid touchscreen interference

V_Palacio — Mon, 23 Jan 2023 16:29:34 GMT

Hi,

We have a device with a PN7150 reading RFID cards through a screen with a capacitive touch. Host is a Linux embedded ARM (iMX6) with libnfc-nci-linux.

When RFID is active, it generates an interfence than generates random touch events.

Disabling some technologies from polling (HOST_LISTEN_TECH_MASK), I can reduce this interferences, but I cannot get ride of all of them.

I'm trying to reduce radiated power from the NFC antenna, in order to see if I can eliminate false touch events, but I'm not finding any way to do this.

1 There is no function in libnfc-nci API to set power values

2 I've not found any parameter in the config files (libnfc-nci.conf libnfc-nxp-init.conf libnfc-nxp-pn548.conf) that can set power values.

I suspect NXP_CORE_CONF array can modify some config to do the trick, I cannot find any clue in the chip manual as what can change to do this.

Can someone point me in the right direction for this?

Regards,

NFCのトピックPN7150 reduce power to avoid touchscreen interference

PN7150 reduce power to avoid touchscreen interference