Chief Delphi - switches in order

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PBoss

26-01-2003 03:59

switches in order

Here is a piece of code in PBasic 2.5
IF p1_sw_top=1 AND p2_sw_top=1 then
p1_y=200

This means that at any given time, if p1 switch and p2 switch are pressed together p1_y=200, but here is my question:

Is there a way that you can program so that the switches will have to be pressed in order- first p1 switch and then p2 switch or vice versa- then only p1_y=200???

ttedrow

26-01-2003 04:17

Yes, you can declare a latch or memory bit that is set when the first button is pushed and cleared when the second button is pressed.

Tim Tedrow

PyroPhin

26-01-2003 09:04

yes, you can do that very simply, using 2 for, next loops:

sw1:
if p1_sw_top = 1 then sw2
goto endswich

sw2:
if p2_sw_top = 1 then dostuff:
goto endswich

Dostuff:
p1_y = 200

endswich:

the program will process the first loop, then only if that requirement is met, go to the second loop. if the requirement isnt met at either button, or at the second, not the first, it bypasses the dostuff loop ^.^

~Pyro

Nate Smith

26-01-2003 10:45

Here's a bit of code which will do what you want:

Code:

'in variable declaration section

seq1_flag VAR bit



'in main loop



'Check 2nd condition first to allow for continuous action, and not just one loop

if p2_sw_top = 1 AND seq1_flag = 1 then run_seq1



'Check first condition

if p1_sw_top = 0 then skip_seq1



'if we got here, condition 1 is true, set flag

seq1_flag = 1

'jump out of sequence loop

goto seq1_done



skip_seq1:

'first condition is not met, clear flag

seq1_flag = 0

'jump out of sequence loop

goto seq1_done



run_seq1:

'both conditions met, set value

p1_y = 200



seq1_done:

'end of sequence loop

PyroPhin

26-01-2003 15:50

isnt that overkill?

~Pyro

rbayer

26-01-2003 22:02

No. The code you posted doesn't actually take the order you pressed the switches into account. The switch variables don't get updated until you do a SERIN, so you need a way to keep track of stuff between the loops.

--Rob

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