In PC folder i have not use existing main.c, I have make my own make new main.c using existing main.c Very simple appl. Create queue create task task function entry : sending mes and receiving mes Run successfully but after 1 sec gives this message -———————– 16 bit MS-DOS Subsystem C:FreeRTOSDemoPCrtosdemo.exe The NTVDM CPU has encountered an illegal instruction. CS:1044 IP:a72c OP:ff ff 00 00 4d Choose ‘close’ to terminate the application close Ignore -————————– What could be the problem? Can anyone support me? Thanks

Does the demo that comes with the download run OK? See if there is anything useful in this thread, which describes something similar. https://sourceforge.net/forum/forum.php?thread_id=1731798&forum_id=382005 Regards.

yes, Demo comes with download only. From that thread i didn’t get any info. anyone knows let me know.

If anyone done application on PC like me, anyone got same error? what could be the reason? it is very important for me to remove error, b’coz i don’t have any other hardware to test functionality of RTOS.