ESP32 Forum

Posted: **Mon Aug 07, 2017 11:29 am**

I try to create a Task which is pinned to Core 0, but it fails. My other task works fine.
Here is a code snippet:

void task1(void* arg)
{
    //This works
}

void task2(const char* data)
{
    //This not
}

    xTaskCreatePinnedToCore(
        task1, /* Function to implement the task */
        "task1", /* Name of the task */
        8192, /* Stack size in words */
        NULL, /* Task input parameter */
        1, /* Priority of the task */
        NULL, /* Task handle. */
        1); /* Core where the task should run */

      xTaskCreatePinnedToCore(
        task2, /* Function to implement the task */
        "task2", /* Name of the task */
        8192, /* Stack size in words */
        NULL, /* Task input parameter */
        2, /* Priority of the task */
        NULL, /* Task handle. */
        0); /* Core where the task should run */

error: invalid conversion from 'void (*)(const char*)' to 'TaskFunction_t {aka void (*)(void*)}' [-fpermissive]
0); /* Core where the task should run */

Is it because of 'const char* data' in my function task2?

Posted: **Mon Aug 07, 2017 11:52 am**

Hi,
FreeRTOS uses

Code: Select all

void task(void* param)

as the function's signature. Any other function signature breaks ABI.
To work around this, pass the pointer to your data as a void pointer and cast and assign it to the preferred type of variable on function entry, like so:

Code: Select all

const char* data = (const char*) param;

Posted: **Mon Aug 07, 2017 12:14 pm**

Thanks!

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Can't create a second xTaskCreatePinnedToCore()

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