Hi everybody, I just want to know if there is anyone who had debugged the printf function using a modified putchar.c file. This is becasue my project which uses my own putchar.c file added to my project was compiled without any error nor warning. However when simulating the program I expected that once arriving at the statement printf the program cursor or execution jumped to my putchar.c file instructions(putchar function inside) carring the first character of the printf message, but not, it continues with the following statement in my main(caller)file which is a delay. My question is: How can I see , under debugging mode, that the printf effectively calls the putchar.c file and continues with the execution of the putchar function code? I appreciate so much your help. Regards OmarE