On Aug 20, 2004, at 7:34 AM, Lawrence Lile wrote:

> So here is the architecture question:  To interrupt or poll?  Put the
> RX line and interrupt on PortB,0, and use the "external interrupt"?
> Move it all back to a hardware UART, and use that as an interrupt
> source?  Or poll it all the time with kbhit() ? How do other people
> approach this?
>
If you can't have actually interrupt-driven IO (which is ideal, but can
be a bit tricky to implement on a bit-banged serial port), what you
probably want is a getc_wait(timeout) function:
        getc_wait(int timeout)
     {
            int then = currenttime()+ timeout;
            while (currenttimer < then) {
                    if (kbhit()) {
                           return getc();
                        }
                }
        }

this is what parallax's basic-stamp "serin" does, isn't it?

BillW

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics