Impossible to use I2C in an external PCB at the same time as Explore NFC board

After several days, It works!! The Explore NFC is working properly in card emulation mode, in  a PCB with other I2C devices, without corrupting the I2C communication. We have modified the library deleting completely all the reference to the GPIO 2 in this file:

CardEmulation-FB_NFC-Sources\CardEmulation-FB\source\NxpRdLib_PublicRelease\comps\phbalReg\src\RPiSpi\phbalReg_RPiSpi.c

In the Explore NFC, pins 2 and 3 (i2c pins) are not connected to the Raspberry Pi.

I hope it helps to anybody with the same issue,

Bye!

Hi, i know this post is quite old but...

Where "CardEmulation-FB_NFC-Sources" is located on the Raspberry ?

I'm having the same issue on RPI, can you help us with the path of the sources?

I've no idea but.. it appears you can go here:

EXPLORE-NFC - Exclusive from element14|NXP

Click on Downloads tab and download the software.

The software has changed since the year 2014, this is an ancient post, don't expect to find the same path to the files or the same filename.

You will still find the source\NxpRdLib_PublicRelease\comps folder (the top level path is source\ and not CardEmulation-FB_NFC-Sources\CardEmulation-FB\Source)

and some files with similar names but looks like enough changes have occurred that the file names are different.

You'll have to use your own initiative to figure it all out though - once you do figure it all out, please respond back with information to help others.

The relevant GPIO configs are now located here:

SW282911.zip\explorenfc-cardemulation_1.1.tar.gz\source\NxpRdLib_PublicRelease\comps\phbalReg\src\Stub\phbalReg_Stub.c

You can get the zip with sources here:

EXPLORE-NFC - Exclusive from element14|NXP

Michael

Hello Virginia, I have the same problem as you had. My project consists in Raspberry Pi 3 communicating  with a custom PCB composed of Explore NFC (PN512) and other devices. I am using the SPI and I2C protocols. The SPI communication between Explore NFC (PN512) and Raspberry Pi 3 has been implemented using this guide https://www.nxp.com/docs/en/application-note/AN11480.pdf . The problem is that the I2C communication is corrupted by the SPI and I have a limited time to solve the problem. I would like you to help me and, in particular, to give me the modified library allowing a good coexistence between SPI and I2C protocols. Thanks in advance.