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Odd addresses generated for PIC33F CLR instruction- OK?

 
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leporid



Joined: 04 May 2010
Posts: 6

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Odd addresses generated for PIC33F CLR instruction- OK?
PostPosted: Sun May 09, 2010 11:41 pm     Reply with quote
Hi-
I am a dsPIC newbie, and have been trying to nail down the cause of a
restart loop in PCI33F code that I inherited. The ASM code that apparently
causes the reset is:

Code:

....................    gpsData.dateInfo.adjusted.time = 0;
009A4:  CLR     DDB
009A6:  CLR     DDD

Note that the operand addresses in both instructions are ODD.
Is an odd address legal in a CLR instruction?

Also, a different source line (if I read it right) is using even addresses
for the same variable:
Code:
....................    gpsData.dateInfo.adjusted.time = res;
01B86:  PUSH    F1C
01B88:  POP     DDA
01B8A:  PUSH    F1E
01B8C:  POP     DDC


I hate to suspect the compiler when I'm so new to dsPICs, but
this really looks odd (pun intended).
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Mon May 10, 2010 7:16 am     Reply with quote
Word accesses (e.g. CLR) to an odd address cause an address error trap with PIC24/dsPIC. As discussed in a previous
thread, you can enable a trap handler to visualize this kind of error (and even allow the code to continue, if meaningful at all).

http://www.ccsinfo.com/forum/viewtopic.php?t=36479
leporid



Joined: 04 May 2010
Posts: 6

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Odd addresses generated for PIC33F CLR instruction- OK?
PostPosted: Mon May 10, 2010 1:57 pm     Reply with quote
Thanks, maybe an interrupt routine can help me learn more.
But the odd addresses seem like a real problem.
I have filed a bug report.
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