Create a ProgramSection in Flash. Not working.

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Doug Sandru

• March 28, 2011 20:41

I am trying to create a const version number at a specific location in flash.

In my .c file:

#pragma constseg("VERSION")
const volatile WORD ver = 100;
#pragma constseg(default)

In my section_placement file:

...
<MemorySegment name="FLASH">
    <ProgramSection load="Yes" name="ISR"  />
    <ProgramSection load="Yes" name="CONST"/>
    <ProgramSection load="Yes" name="CODE" />
    <ProgramSection size="2"  load="Yes" start="0xFF90" name="VERSION" />
    <ProgramSection size="68" load="Yes" start="0xFFA0" name="CHECKSUM"/>
    <ProgramSection size="32" load="Yes" start="0xFFE0" name="INTVEC"  />
  </MemorySegment>
...

I am doing this now with const calibration data in different sections (D,C, & B) and with the compiler generated checksum. My .map file and .hex file are coming back without that section. I have no idea what I am missing here...

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  Paul Curtis

  • March 28, 2011 21:11

  One assumes you have not instructed the linker to keep that symbol.

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  Doug Sandru

  • March 28, 2011 21:17

  Thanks Paul, I changed the Linker Options->Keep Symbols to include "VERSION" in the solution properties. As a result I get a warning: "kept symbol "VERSION" not found in object files". Still the memory section isn't created. Maybe I did something wrong?

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  Paul Curtis

  • March 28, 2011 21:25

  If you read the manual in this area, it has some tips on what you need to do.  I could tell you here, but really, try reading the manual...

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  Doug Sandru

  • March 28, 2011 21:43

  I have read through the manual and done numerous searches on the topic before I posted here. It might be obvious but I still don't see it.

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  Doug Sandru

  • March 29, 2011 12:17

  I still have not found a solution to my problem. I have added command line argument -K_ver per manual... Also included _ver in the keep symbols option under linker properties. The only way I get this to work is if I set up a dummy instruction in main to equal _ver. This is obviously specific to the compiler so I would think I could get a little more help on this issue...

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  Paul Curtis

  • March 29, 2011 12:28

  The Linker Options > Keep Symbols should be set to _ver.

  I've just tried this and it works perfectly.

  The symbol to keep is not VERSION but _ver.

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  Doug Sandru

  • March 29, 2011 12:36

  I did see that mistake yesterday, but this is still not working for some reason. I have this set under the properties config Solution->Common

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  Doug Sandru

  • March 29, 2011 12:37

  I should also note I am using CrossWorks for MSP430 Release 2.1.0.2010120702.9082

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  Paul Curtis

  • March 29, 2011 12:41

  I have attached an example project which does exactly what you need.  It builds and "ver" is correctly placed.

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  Doug Sandru

  • March 29, 2011 12:49

  I found the problem. I was adding the "_" to the variable name in the code as well as the option in the linker to keep the symbol. The "_" should only be added to the option in the linker config and not in the code itself. This fixed it.

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  Paul Curtis

  • March 29, 2011 12:51

  This is covered in the documentation:

  http://www.rowleydownload.co.uk/documentation/msp430_2_0/hcl_option_keep_symbol.htm

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  Doug Sandru

  • March 29, 2011 12:56

  I read that and took it to mean add "_" to the C variable name in my code... It was a misunderstanding of the documentation. Sorry for the misunderstanding and thanks for taking the time to help out.

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  Paul Curtis

  • March 29, 2011 12:58

  Hmm, ok.  I can read it that way too.

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