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passing ports to a function

Justin Moses

I have a program in which I have to manipulate 4 LEDs. I have a function that is designed to find out exactlywhat I need to do to each LED ie flash, fade, dim, etc but in order to save on code space I would like to send the program the LED by reference. For instance on of my functions looks like the following:

void switchon(&sbit LED, bit turnon)
{
  if(turnon)
  {
    LED=ON;
  }
  if(!turnon)
  {
    LED=OFF;
  }
}
where LED is the LED I am currently wanted to manipulate. I keep getting errors with this code. I have even tried just passing the LED by value and as a bit. Nothing seems to work. Is this valid?

Thanks
Justin Moses

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  • 0 in reply to HansBernhard Broeker

    "It's quite simple, really: "pass by reference" doesn't exist in C. You have to pass a pointer instead:"

    Except that bits are not "addressable" and therefore cannot be directly passed by reference. Also, presuming LED is a port (meaning SFR) bit, the SFR cannot be passed by reference assuming you want to directly dereference it.

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  • 0 in reply to HansBernhard Broeker

    "It's quite simple, really: "pass by reference" doesn't exist in C. You have to pass a pointer instead:"

    Except that bits are not "addressable" and therefore cannot be directly passed by reference. Also, presuming LED is a port (meaning SFR) bit, the SFR cannot be passed by reference assuming you want to directly dereference it.

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