RGB LED controller that change color in sequence,did anyone have sample program?

hello, im a newbie in this PIC, i never learn about this pic 16f877a, but my supervisor asked me to write a program with it in c.
did anyone have the kind of sample to let me use as reference??
thank you if anyone could help.
my project is RGB LED controller
this project use to change the color in sequence, i don't have any clue about it, please help.thank you