INL Command

Archiver

Ok, I'm trying to get a good understanding of the INS,INL,INH
functions or commands in PBASIC or within the BS2SX IC. I'm trying
to continuously check the status of the first inputs(1-8) on the
activity board(Port X7). When 2 of the pins go high, I want to use
the IF...THEN statement to do other things. But I can't seem to
check the INL or the inputs correctly. Can someone help me with this
problem? Thank You

Another question, on the activity board, port X7 shows pins 1-20.
Does it really mean pins 0-19? ...like pin1 is really pin0 for
programming purposes??? Thanks...someone please help me out

Archiver

In a message dated 3/11/2003 7:37:55 PM Pacific Standard Time,
the_prettiest@h... writes:

> Ok, I'm trying to get a good understanding of the INS,INL,INH
> functions or commands in PBASIC or within the BS2SX IC. I'm trying
> to continuously check the status of the first inputs(1-8) on the
> activity board(Port X7). When 2 of the pins go high, I want to use
> the IF...THEN statement to do other things. But I can't seem to
> check the INL or the inputs correctly. Can someone help me with this
> problem? Thank You
>
> Another question, on the activity board, port X7 shows pins 1-20.
> Does it really mean pins 0-19? ...like pin1 is really pin0 for
> programming purposes??? Thanks...someone please help me out


You want to do what is called bit masking.......

Write and AND statement to check the bits that you want to view.

example

if you want to check bits 0 and 1 but actually looking at the first 8 bits
(INL)

My syntax is probably wrong, but the idea is this:

Assing a variable to INL, for example Low_byte

code:

Low_byte = INL
Low_byte = Low_byte AND 00000011

Now perform your IF test on Low_byte

If both bits of INL were high, Low_byte will equal 3 (decimal)

If only bit 1 was high, Low_byte will equal 2.(decimal)

If only bit 0 was high, Low_byte will equal 1.(decimal)

Many other "stampers" will indeed correct my syntax if it is incorrect, and
likely give you a better way to do it. This solution is only one of many.

Ken



[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> In a message dated 3/11/2003 7:37:55 PM Pacific Standard Time,
> the_prettiest@h... writes:
>
> > Ok, I'm trying to get a good understanding of the INS,INL,INH
> > functions or commands in PBASIC or within the BS2SX IC. I'm
trying
> > to continuously check the status of the first inputs(1-8) on the
> > activity board(Port X7). When 2 of the pins go high, I want to
use
> > the IF...THEN statement to do other things. But I can't seem to
> > check the INL or the inputs correctly. Can someone help me with
this
> > problem? Thank You
> >
> > Another question, on the activity board, port X7 shows pins 1-
20.
> > Does it really mean pins 0-19? ...like pin1 is really pin0 for
> > programming purposes??? Thanks...someone please help me out
>
>
> You want to do what is called bit masking.......
>
> Write and AND statement to check the bits that you want to view.
>
> example
>
> if you want to check bits 0 and 1 but actually looking at the first
8 bits
> (INL)
>
> My syntax is probably wrong, but the idea is this:
>
> Assing a variable to INL, for example Low_byte
>
> code:
>
> Low_byte = INL
> Low_byte = Low_byte AND 00000011
>
> Now perform your IF test on Low_byte
>
> If both bits of INL were high, Low_byte will equal 3 (decimal)
>
> If only bit 1 was high, Low_byte will equal 2.(decimal)
>
> If only bit 0 was high, Low_byte will equal 1.(decimal)
>
> Many other "stampers" will indeed correct my syntax if it is
incorrect, and
> likely give you a better way to do it. This solution is only one of
many.
>
> Ken
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]

Thanks Ken! This clears up a lot. So I must setup a variable that's
equal to INL? Ok, I'm checking 8 inputs only. At any time, any one
of those 8 inputs may go high, but only 2 go high at a time and they
only stay high for 1 second before going back low. I must
continuously read or check these inputs and make sure that I catch
them when they go high. So, with this being the case, should I start
out with something like:

Low_Byte = INL
Low_Byte = Low_Byte AND 11111111

IF Low_Byte = 9 THEN Label-On 'Bits 0 and 3 go high

Would this be correct? Would I need to use INA, INB, INC, IND? Thanks
for your help...all of you...Thanks

Archiver

In a message dated 3/12/2003 6:34:31 AM Pacific Standard Time,
the_prettiest@h... writes:

> Thanks Ken! This clears up a lot. So I must setup a variable that's
> equal to INL? Ok, I'm checking 8 inputs only. At any time, any one
> of those 8 inputs may go high, but only 2 go high at a time and they
> only stay high for 1 second before going back low. I must
> continuously read or check these inputs and make sure that I catch
> them when they go high. So, with this being the case, should I start
> out with something like:
>
> Low_Byte = INL
> Low_Byte = Low_Byte AND 11111111
>
> IF Low_Byte = 9 THEN Label-On 'Bits 0 and 3 go high
>
> Would this be correct? Would I need to use INA, INB, INC, IND? Thanks
> for your help...all of you...Thanks
>

From what I see, you correctly understood my explanation.

The example you listed will indeed check the status of all 8 bits, and you
are correct when you stated:

"IF Low_Byte = 9 THEN Label-On 'Bits 0 and 3 go high"

You can use INA if you want to check only input pins 0 through 3. INB equates
to input pins 4 through 7, INC = bits 8 ~ 11 and of course, IND = bits 12 ~
15.

Or, INL will check pins 0 ~ 7, INH is pins 8 ~ 15. (if I remember correclty -
I don't use the stamp much these days)

Also, since your "two pins" will remain high for only one second, you program
loop should continuously check INL. The loop itself probably takes i500 to
600 uS or less to complete, so you should have no problem "missing" the high
state of both pins.


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Archiver

--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> In a message dated 3/12/2003 6:34:31 AM Pacific Standard Time,
> the_prettiest@h... writes:
>
> > Thanks Ken! This clears up a lot. So I must setup a variable
that's
> > equal to INL? Ok, I'm checking 8 inputs only. At any time, any
one
> > of those 8 inputs may go high, but only 2 go high at a time and
they
> > only stay high for 1 second before going back low. I must
> > continuously read or check these inputs and make sure that I
catch
> > them when they go high. So, with this being the case, should I
start
> > out with something like:
> >
> > Low_Byte = INL
> > Low_Byte = Low_Byte AND 11111111
> >
> > IF Low_Byte = 9 THEN Label-On 'Bits 0 and 3 go high
> >
> > Would this be correct? Would I need to use INA, INB, INC, IND?
Thanks
> > for your help...all of you...Thanks
> >
>
> From what I see, you correctly understood my explanation.
>
> The example you listed will indeed check the status of all 8 bits,
and you
> are correct when you stated:
>
> "IF Low_Byte = 9 THEN Label-On 'Bits 0 and 3 go high"
>
> You can use INA if you want to check only input pins 0 through 3.
INB equates
> to input pins 4 through 7, INC = bits 8 ~ 11 and of course, IND =
bits 12 ~
> 15.
>
> Or, INL will check pins 0 ~ 7, INH is pins 8 ~ 15. (if I remember
correclty -
> I don't use the stamp much these days)
>
> Also, since your "two pins" will remain high for only one second,
you program
> loop should continuously check INL. The loop itself probably takes
i500 to
> 600 uS or less to complete, so you should have no
problem "missing" the high
> state of both pins.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]


Thanks a lot! Ok, I'm dealing with X-10, the XOUT command, and it
seems to slow down the process a little, unless I had things setup
wrong which caused this. When certain pins go high, I want to
perform a certain XOUT command. Ok, so could you give me an example
of how the top portion, the variable declarations section, would look
for what I have going on? Or do I basically have it already? Will I
need to declare anything as INL or will the Low_Byte = INL do? What
would I declare Low_Byte as in the declarations? Thanks for all of
your help. It also seems like when I put my wires into the board,
the program seems to quit running or something. I'm using the
Activity Board. The input port, (X7) has pins 1-20, does it really
mean 0-19...for programming purposes? ...is my first pin pin1 or
pin0? Ok...I know that's a lot of questions...I'm sorry about that,
but if you could answer each of them I would really appreciate it,
really. Thanks in advance.

Archiver

In a message dated 3/12/2003 7:22:23 AM Pacific Standard Time,
the_prettiest@h... writes:

> Thanks a lot! Ok, I'm dealing with X-10, the XOUT command, and it
> seems to slow down the process a little, unless I had things setup
> wrong which caused this. When certain pins go high, I want to
> perform a certain XOUT command. Ok, so could you give me an example
> of how the top portion, the variable declarations section, would look
> for what I have going on? Or do I basically have it already? Will I
> need to declare anything as INL or will the Low_Byte = INL do? What
> would I declare Low_Byte as in the declarations? Thanks for all of
> your help. It also seems like when I put my wires into the board,
> the program seems to quit running or something. I'm using the
> Activity Board. The input port, (X7) has pins 1-20, does it really
> mean 0-19...for programming purposes? ...is my first pin pin1 or
> pin0? Ok...I know that's a lot of questions...I'm sorry about that,
> but if you could answer each of them I would really appreciate it,
> really. Thanks in advance.
>

I am not familiar with the "activity board" and input port X7, and pins 1-20.
Sorry for that. I am sure there are some "stampers" out there that will be
able to help you in that area.

Generally, from what I know, when talking about software, the least
significant bit is bit 0. So the lowest eight bits are bits 0 through bit 7
(first 8 bits)

Regarding the top portion of your program for variable declaration, the
following can be used to check the state of input pins 0 through 7.

Low_byte var byte 'defines variable Low_byte as 8 bits
mask var byte 'defines variable mask as 8 bits
mask = $FF 'assigns value %11111111 to mask


loop:

Low_byte = INL 'moves contents of INL into variable
Low_byte
Low_byte = Low_byte AND mask 'returns which bits of INL were high
'perform your IF statement to check any
number of bits

more code etc.

I hope this helps

Ken


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

In a message dated 3/12/2003 8:28:32 AM Pacific Standard Time,
smartdim@a... writes:

> Regarding the top portion of your program for variable declaration, the
> following can be used to check the state of input pins 0 through 7.
>
> Low_byte var byte 'defines variable Low_byte as 8 bits
> mask var byte 'defines variable mask as 8 bits
> mask = $FF 'assigns value %11111111 to mask
>
>
> loop:
>
> Low_byte = INL 'moves contents of INL into variable
> Low_byte 'OMIT THIS LINE
> Low_byte = Low_byte AND mask 'returns which bits of INL were high
> 'perform your IF statement to check any
> number of bits
>
> more code etc.
>
> I hope this helps
>
> Ken
>



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