ok. thanks for you all previous help. i can work with the USART interrupt with my code already but now i encounter with a new problem.
im using 16f877a.
i need to receive a string of command from computer. then execute some function after received a valid command. now i need to execute the blinking effect by toggling the enable pin to let the led on and off continuosly untill another set string of command come in and either stop blinking or continue blinking.
but now i found out that the blinking sub-routine is a dead loop. when i continuosly execute the blink function and a new string command come in from computer my firmware will hang there.
any solution for this?
i need you all suggestion.
thanks