Systems and methods for mitigating effects of an unresponsive secure element during link establishment

1. A method of communicating with a secure element (SE), comprising:

transmitting successive RSET frames from a single wire protocol (SWP) interface to an SE, the successive RSET frames including RSET frame retransmissions;

counting a number of successive RSET frame retransmissions due to a timer expiring;

generating a firmware interrupt in response to determining that the count has reached a threshold; and

deactivating the SWP interface based on the firmware interrupt.

2. The method of claim 1 , wherein the RSET frame retransmissions occur during a simplified high level data link control (SHDLC) link establishment procedure.

3. The method of claim 1 , wherein the SWP interface is established by a contactless front-end (CLF) communicatively coupled to the SE.

4. The method of claim 3 , wherein the CLF comprises a near-field communication (NFC) controller, and wherein the SE comprises at least one of a universal integrated circuit card (UICC) or an embedded SE.

5. The method of claim 1 , wherein the RSET frame retransmissions occur before any payload data is sent or received.

6. The method of claim 1 , further comprising resetting the count in response to detecting activity from the SE.

7. The method of claim 1 , further comprising resetting the count in response to reactivating the SWP interface.

8. The method of claim 1 , further comprising resetting the count in response to a second timer expiration.

9. An electronic device configured to communicate with a secure element (SE), comprising:

a processor;

a memory in communication with the processor; and

instructions stored in the memory, the instructions executable by the processor to:

transmit successive RSET frames from a single wire protocol (SWP) interface to an SE, the successive RSET frames including RSET frame retransmissions;

count a number of successive RSET frame retransmissions due to a timer expiring;

generate a firmware interrupt in response to determining that the count has reached a threshold; and

deactivate the SWP interface based on the firmware interrupt.

10. The electronic device of claim 9 , wherein the RSET frame retransmissions occur during a simplified high level data link control (SHDLC) link establishment procedure.

11. The electronic device of claim 9 , wherein the SWP interface is established by a contactless front-end (CLF) communicatively coupled to the SE.

12. The electronic device of claim 11 , wherein the CLF comprises a near-field communication (NFC) controller, and wherein the SE comprises at least one of a universal integrated circuit card (UICC) or an embedded SE.

13. The electronic device of claim 9 , wherein the RSET frame retransmissions occur before any payload data is sent or received.

14. The electronic device of claim 9 , wherein the instructions are further executable to reset the count in response to detecting activity from the SE.

15. The electronic device of claim 9 , wherein the instructions are further executable to reset the count in response to reactivating the SWP interface.

16. The electronic device of claim 9 , wherein the instructions are further executable to reset the count in response to a second timer expiration.

17. An apparatus configured to communicate with a secure element (SE), comprising:

means for transmitting successive RSET frames from a single wire protocol (SWP) interface to an SE, the successive RSET frames including RSET frame retransmissions;

means for counting a number of successive RSET frame retransmissions due to a timer expiring;

means for generating a firmware interrupt in response to determining that the count has reached a threshold; and

means for deactivating the SWP interface based on the firmware interrupt.

18. The apparatus of claim 17 , wherein the RSET frame retransmissions occur during a simplified high level data link control (SHDLC) link establishment procedure.

19. The apparatus of claim 17 , wherein the SWP interface is established by a contactless front-end (CLF) communicatively coupled to the SE.

20. The apparatus of claim 17 , wherein the RSET frame retransmissions occur before any payload data is sent or received.

21. The apparatus of claim 17 , further comprising means for resetting the count in response to detecting activity from the SE.

22. The apparatus of claim 17 , further comprising means for resetting the count in response to reactivating the SWP interface.

23. The apparatus of claim 17 , further comprising means for resetting the count in response to a second timer expiration.

24. A computer-program product for communicating with a secure element (SE), the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions comprising:

code for causing an electronic device to transmit successive RSET frames from a single wire protocol (SWP) interface to an SE, the successive RSET frames including RSET frame retransmissions;

code for causing the electronic device to count a number of successive RSET frame retransmissions due to a timer expiring;

code for causing the electronic device to generate a firmware interrupt in response to determining that the count has reached a threshold; and

code for causing the electronic device to deactivate the SWP interface based on the firmware interrupt.

25. The computer-program product of claim 24 , wherein the RSET frame retransmissions occur during a simplified high level data link control (SHDLC) link establishment procedure.

26. The computer-program product of claim 24 , wherein the SWP interface is established by a contactless front-end (CLF) communicatively coupled to the SE.

27. The computer-program product of claim 24 , wherein the RSET frame retransmissions occur before any payload data is sent or received.

28. The computer-program product of claim 24 , wherein the instructions further comprise code for causing the electronic device to reset the count in response to detecting activity from the SE.

29. The computer-program product of claim 24 , wherein the instructions further comprise code for causing the electronic device to reset the count in response to reactivating the SWP interface.

30. The computer-program product of claim 24 , wherein the instructions further comprise code for causing the electronic device to reset the count in response to a second timer expiration.