Hi again.. I am having som troubles using the the using semaphores. I’ve declarated it as extern xSemaphoreHandle mutex; in my .h file and included in my main where I initiated like this mutex = xSemaphoreCreateMutex(); The error message i am getting is that it has an undefined reference to my mutex, which i don’t understand since i’ve included the .h file of it’s initiation??..

Problem solved.