How to write port names into array ?

[Amoque]

Perhaps I misunderstood your inquiry; it is difficult with so little explanation...

Perhaps you mean:

'DEFINE ARRAY
AC var bit[7]

'ASSIGN ALIAS
SYMBOL AC[5] = PORTC.5
SYMBOL AC[4] = PORTC.4
.
SYMBOL AC[1] = PORTB.5

'LOOP THRU VALUES

FOR LOOP = 5 to 1 STEP -1
AC[LOOP] = Some assigned bit value
Next LOOP

Of course, the bit array may be expanded to include as many elements as you need and you may SYMBOL each element to any port or single bit variable you like to access them through a loop - which need not begin at the first element nor continue through the last.

You mention ARRAYWRITE, but if the answer was there you would certainly have seen that in the manual, yes?

[CuriousOne]

Yes, I want to put different port names into array, so when needed, I can read or address them sequentally.

[CuriousOne]

So what I want to do, I'll write a code in some imaginary basic, a bit short code that will do a running led light:

DIM LEDS(3) 'define array with 3 entries
LET LEDS(1)=PORTA.2
LET LEDS(2)=PORTB.3
LET LEDS(3)=PORTC.1 'enter data into array

FOR A=1 TO 3
HIGH LEDS(A)' make pin high
pause 500 ' wait some time
LOW LEDS(A) 'make pin low
NEXT A

[CuriousOne]

So I wrote it in this way, but it does not works:

AC VAR BIT[5]
AR VAR BIT[7]


AC[5]=PORTC.5
AC[4]=PORTC.4
AC[3]=PORTB.3 
AC[2]=PORTB.1
AC[1]=PORTB.5 

AR[1]=PORTB.6
AR[2]=PORTC.7
AR[3]=PORTB.2 
AR[4]=PORTB.0 
AR[5]=PORTB.4 
AR[6]=PORTB.7
AR[7]=PORTC.6 

'make all leds connected to ports on.

low ac[1]
low ac[2]
low ac[3]
low ac[4]
low ac[5]
high ar[1]
high ar[2]
high ar[3]
high ar[4]
high ar[5]
high ar[6]
high ar[7]

'but it does not works
'but it works with code below
low PORTB.3
HIGH PORTC.7



end

[HenrikOlsson]

Hi
It doesn't work that way, it won't work that way and it can't work that way.

When you do AR VAR BIT[7] you are reserving space in RAM for 7 consecutive bits. You can't them simultanously mirror each bit in RAM to a ANOTHER adress (which the ports are) - it won't and can't work.

Aliases must all point to the SAME location, like

AR VAR BIT[7] 
myBit VAR AR[2]

In the above case AR[2] and myBit are the one and same memory location, ie. two names for the same location, you can't do it the other way around. Ie you can't have one name for two locations which is basically what you're trying to do.

When you do

AR VAR BIT[7]

AR[1]=PORTB.6

You are reading the state of PORTB.6 and store the result of that in AR[1].

The only way I know of that is similar to what you're trying is to use a port offsets and a lookup table.

/Henrik.

[CuriousOne]

So,

PORTB.6=AR[1] won't work?

[HenrikOlsson]

Hi,
Well, yes, it'll work.
It'll set the state of PortB.6 to what is stored in AR[1], either 1 or 0 at the time that the instruction executes.
What it will NOT do is create a "mirror" where the state of PortB.6 automatically changes whenever AR[1] changes - which I suspect is what you're looking for.

/Henrik.

[CuriousOne]

Quite interesting, why it can't ?

The code example with LET & DIM is from Sinclair Basic, written in 1982 and running on Z80. It can handle such things, and picbasic pro - can't ?