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SVC delay in debug mode with I-Jet and IAR

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Hello,

since several month we have the problem, that we can't debug our firmware on the RZ/N1 processor anymore. We use the I-Jet debug probe with the IAR-EWB. The problem started with the activation of the SVC call, which is required for RTOS operation.

If the firmware is running free on the system, without a debugger, the SVC context switches work in a timely manner. As soon as we load the firmware in the debugger, each SCV call causes a delay of up to 100ms. This means that the firmware can no longer be tested in debug mode.

My colleague posted this here, but we didn't get any answer:

https://renesasrulz.com/mcu-mpu/rz/f/rz-forum/19619/swi-call-on-bare-metal-rz-n1s-takes-75-to-100-milliseconds

Any ideas how the SVC interferes with the debug registers?

Regards,

Stephan

RTRTOS


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