Just need to clarify...

[tazntex]

In the PBP manual under the REPEAT..UNTIL command it shows this example:
i = 0
REPEAT
PORTB.0[i] = 0
i = i + 1
UNTIL i > 7

I understand how it repeats until i is equal to 7 then moves on but what does the [i] in PORTB.0[i] do? That is the only example that I can find in the manual, other than where serial and the [] Versus is shown.

Thanks

[Bruce]

i is the bit index. PORTB.0[i] = 0 is PORTB.BIT[i] = 0. i increments from 0 to 7, so it clears
PORTB.0 to PORTB.7.

[tazntex]

Thanks for the quick reply Bruce,
So if I understand correctly, by
i = 0
REPEAT
PORTB.0[i] = 0
i = i + 1
UNTIL i > 7

i = i + 1 ' increments PORTB.0 thru 7 and
PORTB.0[i] = 0 ' places a 0 in each bit

Well, I'm good for the day, Learned something new.

Thanks again Bruce

[Demon]

i is the bit index. PORTB.0[i] = 0 is PORTB.BIT[i] = 0. i increments from 0 to 7, so it clears
PORTB.0 to PORTB.7.

I'm happy you posted this question tazntex. I never used the REPEAT instruction, but as a programmer I know I would have fallen into one of those see-what-you-want traps, something like this:

i = 0
REPEAT
PORTB.[i] = 0
i = i + 1
UNTIL i > 7

I would have looked at this code for hours before seeing where I went wrong.


(I wished we had a button that allowed us to use the CODE command, I can never remember the syntax.)

[Heckler]

I for one have called the good people over at MElabs and requested(suggested) that they spend more effort on better syntax examples in the manual. Why waste all those clean white pages? (They agreed, by the way)

As I look at this example it still does not make sense to me.
I would have tried it the same as Robert, and banged my head against the wall for hours...

This one does not look intuitive at all.

Thanks for the heads up...

Dwight

[rsocor01]

Tazntex,

In your first post you said

I understand how it repeats until i is equal to 7 then moves on but what does the [i] in PORTB.0[i] do?

Technically speaking, it repeats until I=8 then it exits the loop. Of course, it won't execute the line PORT[I]=0 for I=8.

Robert

[tazntex]

Thanks goes to all for you help and interest.