Hi all, I wanna use the function like outportb and inportb to read/write my RS-232 port. I have included the "stdio.h" in my C program and it gives out the error messages like ''outportb' missing function prototype'. I have read soem books about that and it just says to include the "stdio.h" will do. Would anyone tell me what I have done wrong? Or the 'stdio.h' header file in my PC is wrong? And where could I download a 'usable' header file?
View all questions in Keil forum