BS2P40 polling question
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Posts: 46,084
With two sets of I/O pins on the 40 pin version how do I handle this situation:
Main I/O pin p15
Aux I/O pin X15
Is this even possible?? If so how do I let the Poll commands know I want to
"watch" both pin 15's??
Thanks
MIke B.
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Main I/O pin p15
Aux I/O pin X15
Is this even possible?? If so how do I let the Poll commands know I want to
"watch" both pin 15's??
Thanks
MIke B.
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Comments
When you set pin15s to do polling on the MAINIO and AUXIO both are active all
the time. Some example code below:
mainio
pollmode 0 'deactivate polling interrupts
pollout 0,1 'if an interrupt occours make pin0 high
pollin 15,0 'set active when pin15 goes low
auxio
pollin 15,1 'set active when pin15 goes high
mainio
pollmode 2 'activate polling
start: 'do program and if an interrupt occurs pin0
(mainio) will go high
For x=128 to 131 'read all pins (mainio, 128 & 129, and auxio, 130 &131)
to determine which polling pin was active
get x,y
debug bin8 y,cr 'screen print in binary
next
goto start
Hope this helps.
Chuck
That answered my question. The manual is pretty vague in this area and I
am having a hard time getting up to speed on these new (to me) commands in
the 'P' series chips. I have a pretty complex hardware environment to keep
track of and need to be pretty sharp on the polling stuff and also running
programs in the various slots to make sure I don't lose track of my under
water vessel ! ! Were getting there slowly but surely.
Thanks again..
Mike B.
Original Message
From: <CHIPKEN@a...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, September 02, 2002 3:52 PM
Subject: Re: [noparse][[/noparse]basicstamps] BS2P40 polling question
> Mike,
> When you set pin15s to do polling on the MAINIO and AUXIO both are active
all
> the time. Some example code below:
>
> mainio
> pollmode 0 'deactivate polling interrupts
> pollout 0,1 'if an interrupt occours make pin0 high
> pollin 15,0 'set active when pin15 goes low
> auxio
> pollin 15,1 'set active when pin15 goes high
> mainio
> pollmode 2 'activate polling
> start: 'do program and if an interrupt occurs pin0
> (mainio) will go high
> For x=128 to 131 'read all pins (mainio, 128 & 129, and auxio, 130
&131)
> to determine which polling pin was active
> get x,y
> debug bin8 y,cr 'screen print in binary
> next
>
> goto start
>
> Hope this helps.
> Chuck
>
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1 Hz squarewave, (Half second high, half second low). I have tried various
Pollmodes (3,4, 10, 11) however it appears that I am finishing my "POLLRUN"
while the squarewave is still in the high condition which I assume is triggering
the pollrun again.
Apparently what I need to do is only react to a TRANSISTION from low to high
so the run 1 only executes once per second. Can this be done somehow using
polling?? I suppose I could build a circuit to generate a short pulse only on
the low to high transistion but that seems a bit extreme.
Any clever ideas out there??
Mike B.
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w6ffc@p... writes:
> Progress however slight is progress. I have the need to react every second
> to a 1 Hz squarewave, (Half second high, half second low). I have tried
> various Pollmodes (3,4, 10, 11) however it appears that I am finishing my
> "POLLRUN" while the squarewave is still in the high condition which I
> assume is triggering the pollrun again.
That is correct when I looked at your code.
>
> Apparently what I need to do is only react to a TRANSISTION from low to
> high so the run 1 only executes once per second. Can this be done somehow
> using polling??
You could reverse the pollin (pollin 1,0 to pollin 1,1) when in run 1.
I suppose I could build a circuit to generate a short pulse only on the low
to high
> transistion but that seems a bit extreme.
>
> Any clever ideas out there??
>
Sorry I was late getting back. Your code seems to have a clear direction but
you might need to install a delay so the pollin can go back to its non alarm
state. You could use another pollin pin for alarm control after you have
cleared the old pollin pin alarm.
Regards,
Chuck
> Mike B.
>
>
>
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