beginner: Port set

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aladin

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beginner: Port set

· Gepostet: 26.06.2010 - 16:50 Uhr · #1

Hello,

I have Mega8 and want to set pins on PortD as output .

How to do procedure as PinSet (PortD,pin(0..7),1..0 ) ?

I know to set only by PortD := %00001010

Please help me
Thanks

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Homepage: e-lab.de
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Dabei seit: 03 / 2002

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Re: beginner: Port set

· Gepostet: 26.06.2010 - 20:34 Uhr · #2

Hello,

if you want to set a port to output you have to use the DDRx register, port direction register.

rolf

aladin

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Re: beginner: Port set

· Gepostet: 26.06.2010 - 23:41 Uhr · #3

Danke, but ... How?

DDRD:= %00001111;

how to set only one bit ? simply please

nwrightson

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Re: beginner: Port set

· Gepostet: 27.06.2010 - 01:56 Uhr · #4

DDRD.3 := 1;
PortD.5 := 0;

aladin

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Re: beginner: Port set

· Gepostet: 27.06.2010 - 09:14 Uhr · #5

thank you very much, it works

.

I tested

DDRD := 255;
for x:=0 to 7 do
PortD.x := 1;
MDelay(100);
//DDRD.[x] := 1;
PortD.x := 0;
MDelay(100);
endfor;

but this doesn't work - error

Jest

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Re: beginner: Port set

· Gepostet: 27.06.2010 - 10:29 Uhr · #6

Try this:

Code

procedure test;
var x, y: byte;
begin
  DDRD := 255;
  y := %00000001;
  for x :=0 to 7 do
    PortD := y;
    mDelay(100);
    PortD := 0;
    mDelay(100);
    y := y shl 1;
  endfor;
end;

DDR, Port and Pin are constants.

Best regards,
Andrej

aladin

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Re: beginner: Port set

· Gepostet: 27.06.2010 - 13:40 Uhr · #7

Hvala Andrej, it works

I don't know, why this simply information is not in Tutorial, as is for PicAxe - for small IC maybe 300pages with pictures...
I mean, that e-Lab is only for Professionals... but I don't like C

Jest

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Re: beginner: Port set

· Gepostet: 27.06.2010 - 15:47 Uhr · #8

Well, I do not agree that AVRco is for professionals only. It is not simple and you have to read some fundamentals about Pascal and AVR specific parts in AVRco. And when you will, that C will be just 4th letter of word Pascal.

Best regards,
Andrej

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