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I can't get familiar with PUTCHAR and PUTS

I've got a problem. I've posted it yesterday but it was probably lost in text.

static void Nastav_seriovy_kanal (void)
{
	SCON = 0x50;
	TMOD = TMOD | 0x20;
	TH1 = 0xF4;
	TL1 = 0xF4;
	ES = 1;
	TR1 = 1;
}

static void Preruseni_seriovy_kanal (void) interrupt 4
{
	if (RI == 1)
	{
	    RI = 0;
	    if(SBUF == 'A') putchar('Q');
	}
	if (TI == 1) TI = 0;
}

I'm also including stdio.h, and string.h(string.h is not necessary).

Does anyone have any idea why it doesn't work?

Parents

0 Christoph Franck over 19 years ago
if (TI == 1) TI = 0;

If you remove this line, does it work ?

putchar.c will wait for TI to become '1' before sending a character. Setting TI to '0' manually therefore is probably a bad idea.
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0 Christoph Franck over 19 years ago
if (TI == 1) TI = 0;

If you remove this line, does it work ?

putchar.c will wait for TI to become '1' before sending a character. Setting TI to '0' manually therefore is probably a bad idea.
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0 Andy Neil over 19 years ago in reply to Christoph Franck

"putchar.c will wait for TI to become '1' before sending a character."

Quite so.

The source for putchar (and some others) is provided - so you can see it for yourself:

http://www.keil.com/support/man/docs/c51/c51_lib_source.htm
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