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#bit into an array?

 
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Will Reeve



Joined: 30 Oct 2003
Posts: 209
Location: Norfolk, England

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#bit into an array?
PostPosted: Wed May 18, 2011 10:53 am     Reply with quote

Never had to do it before but I would like to do the following:
BYTE address, i2creceivedata[5], i2csenddata[5];
#bit iRun = i2csenddata[4].0
#bit iError = i2csenddata[4].1

I can't see a reason why this isn't possible as the compiler must know where the array is stored. Is there a good robust workaround?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed May 18, 2011 11:57 am     Reply with quote

This works, but it seems a little messy.

What this does is:
- Declare the array
- Set a fixed address for it
- Identify an element and its address
- Declare a bit in that element

Maybe there's some easier way to do it, but I don't have time to work
on this any more.
Code:

#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

BYTE i2csenddata[5];
#locate i2csenddata = 0x400
#byte i2csenddata_4 = i2csenddata +4
#bit iRun = i2csenddata_4.0

//======================================
void main(void)
{

iRun = 1;

while(1);
}
Will Reeve



Joined: 30 Oct 2003
Posts: 209
Location: Norfolk, England

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PostPosted: Wed May 18, 2011 12:52 pm     Reply with quote

Thanks, looks a very neat solution to me. I was using up precious code to do this with variables.
Ttelmah



Joined: 11 Mar 2010
Posts: 19496

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PostPosted: Thu May 19, 2011 2:40 am     Reply with quote

As a comment, you don't need to locate the array, the compiler already knows where it is, and can do the offset in the same line as the bit location.
So:
Code:

BYTE i2csenddata[5];
#bit iRun = i2csenddata+4.0


Will happily give you a variable 'iRun', accessing bit 0 of the last byte in i2csenddata.
It is a really useful ability. Smile

Best Wishes
bkamen



Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA

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PostPosted: Fri May 20, 2011 7:53 pm     Reply with quote

I also tend to build structures so I don't worry about the big location when modifying it... only when creating the structure.

From there, I can spit out the entire struct or plunk around in it by names.

-Ben
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