Use NFC in nrf52840 in 2-way communication mode

[Moghees]

Hi we are designing custom Board using nrf52840 and want to use NFC as mode of communication. We want to use NFC in nrf52840 in 2 way communication mode. My questions are:

1) Is it possible to achieve 2-way communication using NFC in nrf52840?

2)  What is best possible way to achieve NFC 2-way communication in nrf52840? 

[Jared]

Hi,

With the NFC peripheral alone? Not that I'm aware off. The NFC is half duplex in that communication is only sent in one direction. Try using the UART peripheral instead. 

regards

Jared 

[Moghees]

Not at same time. We want to use in half duplex mode. We want to use NFC in nrf52840 to read tags as well. We want to use NFC in peer - peer mode.

Peer-Peer mode:
Peer-to-Peer mode is used to establish a two-way communication channel between a pair of NFC-enabled devices. Each NFC-enabled device serves as an endpoint, meaning the two systems can initiate a communication as equals, or peers. This mode uses either a passive or active communication scheme.

I know we can send data to mobile phone using NFC but can we read data from phone when it is behaving as tag using NFC of nrf52840

Regards,

Moghees

[Jared]

Moghees said:

I know we can send data to mobile phone using NFC but can we read data from phone when it is behaving as tag using NFC of nrf52840

Then you need a NFC reader such as the Adafruit NFC shield. The NFC Tag Reader example shows how you can use the Adafruit NFC shield along with the NFC libraries to setup a NFC reader. 

[Moghees]

So it means we cannot read tag using NFC peripheral available on nrf52840?
Can you tell me the reason why nrf52840 cannot read tags?

Regards,
Moghees Bin Zahid

[Jared]

Because the peripheral is a NFCT(Near Field Communication Tag) peripheral. Which means that it implements the tag role of the NFC protocol. Again, you would need additional hardware to implement the reader role.