SOLVED: i manage to not use class and everithing work fine. Thanks

Thanks for the answer,

could you please provide an example ?

Of course! for be more precise i posted also the: .h file #ifndef int_lib #define int_lib #include "Arduino.h" class InterruptLibrary { public: void interrupt_setup(); void IRAM_ATTR onTimer0(); hw_timer_t * timer0 = NULL; portMUX_TYPE timerMux0 = portMUX_INITIALIZER_UNLOCKED; }; #endif .cpp file #i...

Hello everyone, I want to put this code, that i used for generate a precise interrupt into a library: hw_timer_t * timer0 = NULL; portMUX_TYPE timerMux0 = portMUX_INITIALIZER_UNLOCKED; void IRAM_ATTR onTimer0(){ portENTER_CRITICAL_ISR(&timerMux0); //Code portEXIT_CRITICAL_ISR(&timerMux0); } void set...