Calling to FastSemihosting from interrupts before initialization finished loops

[Gordon01]

It’s very simple to reproduce:

From the main():

1. Initialize RTC and enable it’s IRQ (every second)
2. call printf(“hello world”);

From RTC_IRQHandler:

1. Just call printf(“RTC counter = %ld\n”, wvt_rtc_counter++);

I’ve attached call stack, it gives clear explanation of the problem: WriteRawFastSemihostingData() is called from IRQ before InitializeFastSemihosting() finished.

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[Gordon01]

The microcontroller is STM32L071, running from MSI on 4.194 MHz.

[support]

Hi,

No problem, we have published an update to the profiler framework that introduces a new setting: Disable interrupts during semihosting operations.

Please try updating the framework and then set the new option to “Yes” in order to automatically disable interrupts during the execution of WriteToFastSemihostingChannel().

[Author]

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