Hi, I’m trying to compile a FreeRTOS implementation and I need FastSerial.h, but I receive this erro: …librariesFreeRTOSport.c.o (symbol from plugin): In function `pxPortInitialiseStack’: (.text+0x0): multiple definition of `__vector_12′ Myapp19.ino.cpp.o (symbol from plugin):(.text+0x0): first defined here c:/program files/windowsapps/arduinollc.arduinoide1.8.10.0x86__mdqgnx93n4wtt/hardware/tools/avr/bin/../lib/gcc/avr/4.9.2/../../../../avr/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions collect2.exe: error: ld returned 1 exit status

I’m afraid there is way too little information in your post to know how to reply. I can glean from the file path that you are using an AVR GCC port – which is not from us – so I would recommend asking whoever you obtained the code from. As a guess it seems that you have the same interrupt defined twice – once in the FreeRTOS port.c file, and once elsewhere – maybe in example or driver code.

Sorry, I’m using Arduino Mega environment.

With the FreeRtos sample I can reproduce the problem: ‘# include <FastSerial.h> ‘# include <Arduino_FreeRTOS.h> // define two tasks for Blink & AnalogRead void Task1( void *pvParameters ); void Task2( void *pvParameters ); // the setup function runs once when you press reset or power the board void setup() {…

Sorry, I’ve identified the problem, related with my ISR handling Please close this issue.

I’ve identified the problem, related with my ISR handling

Maybe you can tell what caused the problem? It maybe useful for other users reading this post. Thanks.