Binary Representation of Variables

Vega256

Hey Guys,

Lets suppose that I would like to set I/O pins [0..8] to output and in a loop set their states' to some binary number that increments after every cycle of the loop. How would I contain this value in a variable, increment the value in the variable and represent that value as a binary number? I used the (%) sign followed by the variable name but that produces a compile-time error.

kuroneko

What about something like this:

PUB null

  dira[0..8]~~
  repeat
    outa[0..8]++
    waitcnt(clkfreq/4 + cnt)

outa[0..8] := variable++ will also work (as will thousands of other variations).

Basically there is no special binary state, it's just a different way of looking at it (a variable).

Vega256

var
  byte address
pub first
  address := 0
  dira [16..23] := 1
  repeat
    outa [16..23] := address ++
    waitcnt (3_000_000 + cnt)

When I attached LEDs to the pins using this code, only the first bit is toggled, the second is constantly low.

kuroneko

var
  byte address
pub first
  address := 0
  dira[16..23] := [COLOR="red"]%1111_1111    ' 1 is equivalent to %0000_0001[/COLOR]
  repeat
    outa[16..23] := address++
    waitcnt (3_000_000 + cnt)

Vega256

I see. Although the range expression refers to all of the pins in the range, it is still required to list the states individually.

kuroneko

Vega256 wrote: »

I see. Although the range expression refers to all of the pins in the range, it is still required to list the states individually.

Correct, the left-hand-side is effectively an 8 bit variable (16..23), so you still have to provide 1 bit each. The post set operator (~~) does exactly that for you. You can also assign TRUE (-1).