halting gptimer during jtag debug/breakpoint (IDFGH-15526)

[barbiani]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

Hello everybody,

I am debugging an application that uses gptimer, and after a breakpoint I can see that the timer keeps ticking.

Resuming the code show a big delta count between pre and post breakpoint.

Is there anything I can do to stop the timer when the code is halted/stepping?

Thank you.

[suda-morris]

The GPTimer typically run off its own clock sources and is designed to continue counting even when the CPU is idle or halted—this is common in embedded systems for maintaining precise timing or watchdog functions. But I think you can script openocd to set the TIMG_T0_EN bit of the TIMG_T0CONFIG_REG register before issuing the halt.