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Serial Full Duplex

Hi Community,
i have a big problem. I want to write something like a ECHO - Funktion. That means i recive a char an send it back like in this source ...

void serial_int (void) interrupt 4 using 3
{
    static char chr = '\0';

    if (RI == 1)
    {
        chr = SBUF;
        RI = 0;
        TI = 1;
            TL0 = 0xFF;
    }
    else if (TI == 1)
    {
        TI = 0;
        if (chr != '\0')
        {
            if (chr == '\r') chr = '\n';
            SBUF = chr;
            while(TI == 0);
            TL0 = 0xFF;
            chr = '\0';

        }

    }
}

The Problem is... i am using a Timer for multiplexing my LED-Digits.
Is there a faster methode for this application ?
(SRY FOR MY ENGLISH)

Parents

0 John Donaldson over 20 years ago in reply to Marek Swierzy

"I thing its the time i am waiting for the TI"

You aren't waiting for TI. When TI goes true the ISR is called.

Are you just trying to echo characters back out of the UART?
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0 John Donaldson over 20 years ago in reply to Marek Swierzy

"I thing its the time i am waiting for the TI"

You aren't waiting for TI. When TI goes true the ISR is called.

Are you just trying to echo characters back out of the UART?
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0 erik malund over 20 years ago in reply to John Donaldson
static void com_isr (void) interrupt 4 using 1 { .... putbuf(c); .... } void putbuf (char c) using 0 {

The default "using 0" added to show the problem.

Erik
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