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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Pointers to bits are not permitted |
 Posted: Fri Feb 25, 2011 2:35 pm |
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Hi There,
I created a function that would be called by reference but I get Pointers to bits are not permitted and if wanna pass the address of a value, i get BIT variable not permitted here - is there any way around that so I still can utilize my function?  |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Feb 25, 2011 2:42 pm |
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Post a very short program that can be copied-and-pasted into an MPLAB
project, that can be compiled (except for the error). Example of a short
test program for pointers:
http://www.ccsinfo.com/forum/viewtopic.php?t=40749&start=2
Try to make your program be shorter.
Also post your compiler version. |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Fri Feb 25, 2011 2:52 pm |
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| PCM programmer wrote: | Post a very short program that can be copied-and-pasted into an MPLAB
project, that can be compiled (except for the error). Example of a short
test program for pointers:
http://www.ccsinfo.com/forum/viewtopic.php?t=40749&start=2
Try to make your program be shorter.
Also post your compiler version. |
Absolutely minimized that would be this:
| Code: |
void MyFunction(int1 *test)
{ return; }
void main() {
int1 test;
MyFunction(&test);
} |
And it doesn't work if you change int1 test to int1 *test and the call to MyFunction(test); either... 
Oh, using 4.119 by the way. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Feb 25, 2011 2:57 pm |
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The CCS manual says this:
| Quote: |
Pointers to bits are not permitted
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Post a description of why you want pointers to bits. In other words, what
do the bits represent ? |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Fri Feb 25, 2011 2:59 pm |
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| PCM programmer wrote: | The CCS manual says this:
| Quote: |
Pointers to bits are not permitted
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Post a description of why you want pointers to bits. In other words, what
do the bits represent ? |
I read that as well but it didn't go into my little brain that I might just replace int1 with int8 to make it work (that's what I did now)... thanks for the kick!  |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Sat Feb 26, 2011 6:19 am |
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The reason for the restriction is quite simple.
Pointers are representing the base address of a data memory object. Up to eight Int1 bits are arranged at a single byte address, so the byte address doesn't allow to select it uneqivocally. If you want to apply pointers to a logical value, you have to use int8. |
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