controle led with pus button

[georgetwo]

Hi every one
Im new to pic. Class assignment
I need your help in making my pic18f4550 respond directly to the input of one of the ports.
Example
port c is 8bit output connected to 8 leds

port d is input connected to 8 push buttons

now if i push one button on port c i need the same bit on port b to turn on.

Im using c with Hi-tech c and pic kit 2
thanks for reading
thanks for your suggestions

 

[tom_pay]

Hi

You could multiplex the LEDs. Something like this could do:

if (PININ1 = 1)
{
PINOUT1 = 1;
[B]
TMRO pause[/B]

PINOUT1 = 0;
}

if (PININ2 = 1)
{
PINOUT2 = 1;

[B]TMRO pause[/B]

PINOUT2 = 0;
}

ect.

Then have this for each of the inputs/outputs repeating lots and lots.


Tom

 

[Mosaic]

Just read the Port D (Dig. In) into the w register and write it to the PORT C Register (Dig. out). Two instructions.

movf PORTD,w
movwf PORTC

loop that and you're done.

That's the 16F asm version. 18F has the movff instruction which could prob be all u need. No multiplexing required as u have a pin per button and an LED per pin.

C would be equally simple.

 

[georgetwo]

Thanks for the idear
but how do i express
it in c? i red a book which used assembly as shown
mov A, P0
mov P1, A
just these two

 

[be80be]

Something like this would test for change.

	while(1)
        (
          If  (PortA <> PORTB);
               PortA = PORTB:
  )
)