AVR-Chat

Well in codevisionC it's really easy...

// Input  Port E, Pin 1
#define TESTPIN1  	PINE.1
// Output Port E Pin 2
#define TESTPIN2  	PORTE.2

DDRE = 0b111110;  // All pins outputs except 1
PORTE= 0b000001;  // Enable ouptuts, pullup input pin 1



 while (!stop)
     { 
            TESTPIN2 = TESTPIN1; //light led IF Pin 1 is high (assuming high
lights LED)
     }




-----Original Message-----
From: inpactmicro [mailto:brendan.oflynn@nmrc.ie] 
Sent: February 19, 2004 9:29 AM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] reading a pin


   basic stuff I know but Im banging my head against a wall

Im trying to READ a pin (see if Its set high or low by a switch and 
turning on another testpin - LED on the basis of that
the (supposedly) input pin is on PinE1 (on testpin2)
the output pin iis on PINEo (Testpin 1)

this is my definitions
#define TESTPIN2  	(PINE, 0x01)
#define TESTPIN1_HI  sbi(PORTE, 0x00)
#define TESTPIN2_HI  sbi(PORTE, 0x01)
#define TESTPIN2_IN cbi(DDRE, 0x01)
#define TESTPIN1_LO  cbi(PORTE, 0x00)
#define TESTPIN2_LO  cbi(PORTE, 0x01)

 //init_devices();

 while (!stop)
      { 
                TESTPIN1_HI; //light led
		TESTPIN2_IN;//set direction of input pin (DDRE)
		
		if ((TESTPIN2 == 0) //if switch is off
		   TESTPIN1_LO;

     }
but nothing happens after the led comes on the first time
regardless of the polarity put on the TESTPIN2

can anyone help?

thanks
Bren




 
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