nRF52 NFC record_text example

[Arepa]

Hi all,

Is possible using NFC to send variable message? I want to send a counter event (data I got via BLE) to the NFC module.

Using the example I was not able to do it because the message has to be "constant"

inside the XX_record_add functions I tried, but I did not have luck

any suggestion?

Thanks

[Jørgen Holmefjord]

Hi,

This should be possible. The reason that the member of the record descriptor is declared as const is that it must be consistent for the time the encode function works, to avoid that the data get corrupted.

As long as you make sure that the variable does not change during the time the encoder function work, you should be able to ignore the warning or typecast your variable to a constant.

Note that you need to stop and reinitialize the NFC tag emulation when updating the value, by calling nfc_t2t_emulation_stop() and nfc_t2t_emulation_start().

I have attached an example that output a count value on the NFC interface once every second: nfc_record_variable.zip

Best regards,

Jørgen

[Arepa]

Thanks a lot Jørgen

Sorry for make it an answer too late

[michaeld]

I tried doing this in my code with softdevice but I can only read the NFC ones and then I cannot read it again. Any idea why this would be the case?

[Jørgen Holmefjord]

Is BLE still working on the device after reading using NFC? Have you tried debugging, to see if any error codes are returned?

[michaeld]

Yes BLE works fine and no errors on the NFC Lib functions.

Please take a look at my code: nfc_type2.c