Help with function pointers and xTaskCreate & xTaskCreatePinnedToCore

[qheinal]

I want to run a task on a specific core. The code is loaded from external source. The external code just does some register moves and then an ILL instruction which causes the Illegal Instruction Exception as i intended it to. Code is loaded in IRAM btw.

This works but it dispaches it to wrong core because I set exception handlers specific for core 0 and they dont get triggered.

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         void (*MainPtr)(void*);
         MainPtr = (void(*)(void*))(FunctionAddr) ; //FunctionAddr is the Address of start of code from external source in IRAM
        xTaskCreate(MainPtr,"test" ,8192, NULL, 1, NULL); 

This does not work. It just restarts esp32

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         void (*MainPtr)(void*);
         MainPtr = (void(*)(void*))(FunctionAddr) ; //FunctionAddr is the Address of start of code from external source in IRAM
         xTaskCreatePinnedToCore(MainPtr,"test" ,8192, NULL, 1, NULL, 0);  

This works with no issues.

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         void (*MainPtr)(void*);
         MainPtr = (void(*)(void*))(FunctionAddr) ; //FunctionAddr is the Address of start of code from external source in IRAM
         MainPtr(NULL); //Execute code 

I do not know why it doesn't work for xTaskCreatePinnedToCore because manually triggering execution of code works by using function pointer

[liaifat85]

Please check if that 'FunctionAddr' contains the correct address of the start of the code in IRAM.

[chegewara]

Code: Select all

         void (*MainPtr)(void*);
         MainPtr = (void(*)(void*))(FunctionAddr) ; //FunctionAddr is the Address of start of code from external source in IRAM
         MainPtr(NULL); //Execute code
       

If this works, then maybe try to use some hack and call it from within a task created with xTaskCreate?

Or maybe all works fine, just code crash because task should not return and yours FunctionAddr does return.

[qheinal]

It doesn't return its a loop. Apparently if i change the priority from 1 to 2 it works.