RE: [avr-gcc-list] Heli reding inputs from PORTC

[Gavin Jackson]

The ports are made up of three registers, a direction register DDRA, an
output register PORTA and an input register PINA. Try Using PINC instead of
PORTC when reading back the value.

-----Original Message-----
From: Helix [mailto:address@hidden 
Sent: Tuesday, 3 February 2004 11:32 a.m.
To: address@hidden
Subject: [avr-gcc-list] Heli reding inputs from PORTC


Hello,
I am trying to use an input, but seems thatI'm doing something wrong here. I
tried to turn on some ouput (where I connected a led thatI already tested as
output) when I read an input high. My output is always off (seems that I'm
unable to read input from portc. What am I doing wrong here ? TIA

My CPU is AT90S8515

int main()
{
 unsigned int i;
 unsigned char c ;

 // enable all bits of PORTA as outputs
 DDRA = 0xff;

 // enable all bits of PORTC as inputs
 DDRC = 0x00;

    while (1) {

  if (PORTC)
   PORTA = 0xFF ;
  else
   PORTA = 0 ;
 }

 return 0;
}


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