Access pin using index

[victorf57]

Couldn't we use LOOKUP for this??

my_var = port A

Lookup my_var,[0,1,2,3,4,]pin_pressed



wouldn't pin_presed now hold the pin that was triggered?
Victor

[xnihilo]

Couldn't we use LOOKUP for this??

my_var = port A

Lookup my_var,[0,1,2,3,4,]pin_pressed



wouldn't pin_presed now hold the pin that was triggered?
Victor

From what is written in the manual:

"LOOKUP B0,[“Hello!”],B1 ' Get character number B0 from string to variable B1"

So if you lookup portA then you will have a value equal to the bit rank of the bits that are set. I only need to find the first bit set when reading the PORTA register from LSB to MSB.
With LOOKUP, if the bits 0 and 2 are set, portA will be = 5, that is not the pin_pressed.
(It will will return the value of the 5th constant).

The only way I found till now is to use redundant code like:
if porta.0 = 0 then
pin = 0
Goto bypass
endif
if porta.1 = 0 the
pin = 1
Goto bypass
endif
...etcetera

That's not nice but it works

[skimask]

That's not nice but it works

This may not be any nicer, and I'm not even sure if it'll work...but...

temp var byte
pin var byte

pin = 0 : temp = porta     'initial pin to zero and save porta to temp
loop: pin = pin + 1 : if (temp.0[pin] <> 0) AND (pin <> 4) then loop
got_pin:    'when you get here, if pin = 5 then porta.0 thru porta.3 <> 0

[xnihilo]

This may not be any nicer, and I'm not even sure if it'll work...but...

temp var byte
pin var byte

pin = 0 : temp = porta     'initial pin to zero and save porta to temp
loop: pin = pin + 1 : if (temp.0[pin] <> 0) AND (pin <> 4) then loop
got_pin:    'when you get here, if pin = 5 then porta.0 thru porta.3 <> 0

This seems to be the way to index the pin registers.
In fact before checking the replies on the forum (and your reply) I've tried the tutorial from BRUCE where he is using:
SYMBOL TRIGGERED_PIN = PORTA

Then

IF (TRIGGERED_PIN.0[index] == 0) THEN
...

and it worked fine I'm very happy.

[sheepdog]

You have substituted arrogance for intelligence
Time enough
nostromo signing off

[skimask]

You have substituted arrogance for intelligence
Time enough
nostromo signing off

Even I disagree with that statement...(who would've thunk that eh? )

I think he substituted something that you think MIGHT have worked for him with something that DID work for him.