RE: [Sdcc-user] SDCC help

[EVANDRO L. H. <eva...@si...>]

And don't forget the loop :-)

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#include <8052.h>
#include "generic.c"
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void main (void)
{
   while(1)
   {   =20
        P1_7=3D0;
        sec_wait(2);
        P1_7=3D1;
        sec_wait(2);
   }
}

=20

best regards,

Evandro

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-----Original Message-----
From: Paul [mailto:pa...@pj...]=20
Sent: s=E1bado, 31 de maio de 2003 14:44
To: sdc...@li...
Subject: Re: [Sdcc-user] SDCC help

=20

Shahzad Khan wrote:



Hi,
I am a newbie with SDCC and facing a lot of problem in
a project. I am trying to glow a LED in the main
program and nothing else. But the LED doesn't behave
as desired. I am pretty sure that the problem is in
software.

Why are you sure of that?

A common error is to connect the LED from a port pin to ground, with the=
 intention that the LED will light when the pin is high.  This does not=
 work, because the pin can not source much current.

The LED must be connected between the pin and Vcc, with a current limiting=
 resistor in the range of 200 to 1000 ohms.  Disconnect the wire from your=
 port pin and try shorting it to ground to verify that the LED really does=
 light when the pin is driven low.

Also, connect a voltmeter to the pin and watch the actual voltage.  If the=
 resistor is too high and its a low efficiency LED there may not be enough=
 current to light the LED.





 Either, the linkage is not proper or their
is a memory problem (in RAM).=20
 =20

	Does SDCC give error in
	compilation if there is a memory problem? (small
	model)

Usually you will get an error, but not always.

You did not provide the exact command you're using to run sdcc, so we can=
 not see what options you are giving to the linker for memory mapping. =
 Please refer to the list of 4 recommended things to include in support=
 requests:

http://sdcc.sourceforge.net/#Support




Please help me as I am badly stuck.
 =20

	Find the files attached.
	I am using AT89C52.

The code looks like it should work, assuming you're compiling the main() in=
 the second attached file.


Paul






=20
=20
Thanks in advance,
Shahzad
=20
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