Ahh,,,,very dangerous,,,,,No one should be permitted to write in C language on a microcontroller until they are first proficient in native assembly language.

From the comments in your post it is clear that you do not want to do any work and are less than likely wanting to learn. There is so much information on this subject on the WEB and this forum that you should be already drowning in it if you looked enough.

Nuff Said !!
Michael Karas