New Project with 18F452

Hello, I’m a beginner for RTOS concept. I was buy two book which was written by Mr.Richard Barry and i read it. Now i want to start with RTOS Microchip 18F452. 1.i make a new project at MPLAB with project wizard. 2.i am copy very simple code at MCC18examplegetting_startedprogram1main.c to my directory and include it. 3.i am copy the files which they are founded at FreeRTOSV5.3.0Source directory. These files are croutine.c, list.c, list.o, queue.c, queue.o, task.c, task.o. (Question 1: the object files are required, or C files are sufficent?) 4.i am copy the files which they are founded at FreeRTOSV5.3.0Sourceinclude directory. These files are croutine.h, FreeRTOS.h, list.h, portable.h, projdefs.h, queue.h, semphr.h, StackMacros.h, task.h. (Question 2: All of these files are necessary? Or when am i use this files, when not use?) 5.i am copy the files which they are founded at FreeRTOSV5.3.0SourceportableMPLABPIC18F directory. These files are port.c, port.o, portmacro.h.(Question 2: Object and header files are necessary?) 6.i am copy FreeRTOSCnfig.h file from FreeRTOSV5.3.0DemoPIC18_MPLAB directory. 7.Compile my project. And this is te error. "Make: The target "D:BelgelerimPIC ProgramGTPtrymain.o" is up to date. Make: The target "D:BelgelerimPIC ProgramGTPtrylist.o" is up to date. Make: The target "D:BelgelerimPIC ProgramGTPtryport.o" is up to date. Make: The target "D:BelgelerimPIC ProgramGTPtryqueue.o" is up to date. Make: The target "D:BelgelerimPIC ProgramGTPtrytasks.o" is up to date. Make: The target "D:BelgelerimPIC ProgramGTPtrycroutine.o" is up to date. Make: The target "D:BelgelerimPIC ProgramGTPtrytry.cof" is out of date. Executing: "C:Program FilesMicrochipMCC18binmplink.exe" /p18F452 /l"C:Program FilesMicrochipMCC18lib" "main.o" "list.o" "port.o" "queue.o" "tasks.o" "croutine.o" /u_CRUNTIME /u_DEBUG /z__MPLAB_BUILD=1 /z__MPLAB_DEBUG=1 /o"try.cof" /M"try.map" /W MPLINK 4.31, Linker Copyright (c) 2009 Microchip Technology Inc. Error – could not find definition of symbol ‘vSerialRxISR’ in file ‘./port.o’. Errors    : 1" What is the wrong? At FreeRTOS book, only port.c, list.c and queue.c, task.c files are enough. Could you please explain me! I read the FreeRTOS book many times. But i don’t make a simple project. I am beginner. I’m sorry. Best regards, Zafer

New Project with 18F452

You have copied some files from a project and you did not take in account some others were some funtions are defined in. If you do not want to play with serial port you can include next code in your main.c file, for example, to remove the error message: #if (config_USE_SERIAL_PORT    == 0)     void vSerialRxISR(void){}     void vSerialTxISR(void){} #endif Then in FreeRTOSConfig.h file you have to include next line: #define config_USE_SERIAL_PORT    0