NFC stops working

[T IJ]

Hello Devzone,

For my project I am using NFC and I am using the writeable NDEF message project as an example.

Everything is working except I have found one issue.

Whenever I receive the NFC_T4T_EVENT_FIELD_ON event and I get an interrupt that takes time to complete NFC stops working.

I can still read and write my device but the NFC_T4T_EVENT_NDEF_UPDATED is never triggered.

I use this event to process all incoming data.

This issue can be easily reproduced by adding the following code in the NFC_T4T_EVENT_FIELD_ON event

uint32_t temp = 100000;
while(--temp); // Simulate interrupt by "waiting" in event.

How can I solve this problem that the NFC_T4T_EVENT_NDEF_UPDATED  will be triggered if I receive an interrupt in the NFC_T4T_EVENT_FIELD_ON event?

[T IJ]

I am using RTT backend. I have added some additional prints here and there and this is what I've got.

Every time my device is read, I also do a write so every time the text I got read prints, it should follow up with a I got written

 <info> app_timer: RTC: initialized.
<info> app: NFC starting initializaion
<debug> ndef_file_m: FDS event 0 with result 0.
<info> ndef_file_m: Found NDEF file record.
<debug> ndef_file_m: NDEF file data length: 24 bytes.
<debug> ndef_file_m:  00 16 C1 01 00 00 00 0F|........
<debug> ndef_file_m:  55 01 6E 6F 72 64 69 63|U.nordic
<debug> ndef_file_m:  73 65 6D 69 2E 63 6F 6D|semi.com
<debug> app: NFC active
1
<info> app: NFC starting encryption
Field on
I got read
Field off
Field on
<info> app: NFC starting decryption
Correct
I got written
Interrupt
 Field off
Interrupt
 Interrupt
 Field on
I got read
Field off
Field on
<info> app: NFC starting decryption
Correct
I got written
Field off
Interrupt
 Interrupt
 Field on
I got read
Field off
Field on
Interrupt
 Field off
Interrupt
 Interrupt
 Field on
Field off
Field on
<info> app: NFC starting decryption
Correct
I got written
Field off
Interrupt
 Interrupt
 Field on
I got read
Field off
Interrupt
 Field off
Interrupt
 Interrupt
 Field on
I got read
Field off
Field on
<info> app: NFC starting decryption
Correct
I got written
Field off
Interrupt
 Interrupt
 Field on
Interrupt
 Interrupt

[Simonr]

Thanks, Are you able to print any return values at all so we can see what the various functions in your application returns?

Still no response from our experts on the matter I'm afraid. Thank you for your patience!

Best regards,

Simon

[T IJ]

These prints are all the prints I can do, most of the functions I use do not produce error codes.

Only prints I get are the standard prints from the ndef_file_m.c 

I must say that I've removed the scheduler from the default project as it is not required to update every write to flash.

[Simonr]

Very well, then we'll have to wait for the developers to get back with more details on this. Thank you!

Best regards,

Simon

[T IJ]

Any more news from the developers?.

Thank you