--large_memory_model switch for the MSP430 large memory devices

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Patrick Moran

• July 17, 2011 21:19

The MSP430F54xx apparently require a --large_memory_model  (code composer studio 4 has this) or equivalent switch in the compiler in order to address the 17 address range of the large memory devices. This compiles to a different instruction set when code is located in high memory.

What is the equivalent CrossWorks switch to do this?

Thanks in advance,

PJ

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  Paul Curtis

  • July 18, 2011 10:23

  If you compile for an MSP430X processor with >64KB of memory then the compiler automatically uses appropriate call instructions.  We do not support data >64K.

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  Bart Tormans

  • October 11, 2011 20:16

  If I have code in the >64k range. Should I then use 32bit variables to store function pointer?

  Does CrossStudio automatically make function pointers 32bit in this case?

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  Randy

  • May 02, 2012 22:59

  I am wondering the same thing.  Some code I inherited has function pointers that now point to larger than 64K addresses. Will this still work?

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  Paul Curtis

  • May 03, 2012 07:31

  Code that spans the 1MB address range of the MSP430X works correctly, even with function pointers.

  If you have data in the >64K address space then there is no direct support for this; you can, however, use the functions in <inmsp.h> to read data beyond 64K.

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  Randy

  • May 03, 2012 15:38

  Thank you for your response.  I will try to use the inmsp.h functions for the data that we may have in extended memory.  Is this data limitation something that "may be" enabled in future versions or is there something inherent in the Compiler/Instruction set that makes it difficult to implement?

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  Paul Curtis

  • May 03, 2012 15:39

  There is no compelling reason to support large data spaces; it has such an impact on code for MSP430X that I really don't want to contemplate supporting it.  You can read that as "it's just not going to happen".

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