Monotoring of 8 lines

BernardJP

Hi,
Using BS2sx, I'm expecting to scan 8 lines connected to 8 ports ( positive logic, "1" remaining less than 700mS on one or two lines simultaneouly ).
Trial using BUTTON instructions in an endless loop let me catch no more yhan 5 lines faultless.
Have you a better idea ???
Regards,
Bernard

Paul Baker

Isn't there a way to just read in all 8 if they are on the same port? Someone with experience in PBASIC please confirm if·this is true.

Post Edited (Paul Baker) : 3/24/2005 5:29:59 PM GMT

Bean

Yes, just use INL or INH or even INS (to monitor all 16). I haven't tested this, but something like:

temp VAR byte

temp=INL
Again:
If INL = temp THEN Again
' here is any of the 8 input changed

Bean.

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Jon Williams

Bean has the best idea, and if you're running out of IO pins you can use a 74HC165 shift register to turn three IO pins into eight inputs. Download StampWorks for complete details and code.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

BernardJP

Many thanks to Paul; Bean and yourself Jon !
I'm just reading and understanding Experiment #15 founded in StampWorks and later experimenting !
Best Regards,
Bernard