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ARM Cortex M4

Sarvesh Ranade
Note: This was originally posted on 27th May 2010 at http://forums.arm.com

Hello,
I just wanted to know if the "*.o" file generated by armcc / RVDS giving the option of processor as Cortex M3 is similar if the Cortex M4 were available. I have some code to be run and I was wondering if the Cortex M3 generated files could work with Cortex M4.
If not then in that case is ARMv7 the closest to Cortex M4 (since Cortex documents point to ARMv7 for reference) ?
In that case can I use RVDS to generate the ".o" files for ARMv7 ?
Or do I have to wait till RVDS for Cortex M4 is available ? Is there any GNU compiler which I can use ?

I am exploring the possibility re-using the existing ARM Compiler license for the Cortex M4 to which we plan to upgrade. Any advise / guidance or tips would be helpful.

Regards,
Sarvesh
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  • Arm Employee Badge
    Note: This was originally posted on 28th May 2010 at http://forums.arm.com

    Hi Sarvesh,

    Programs compiled for Cortex-M3 work directly in Cortex-M4.
    (instruction set of Cortex-M4 is a superset of the Cortex-M3).
    So you can use RVDS to compile programs for Cortex-M3, and run it on Cortex-M4.

    Keil MDK-ARM (Microcontroller Development Kit, see www.keil.com/arm/)
    already have Cortex-M4 support.  For the moment I suggest you to use Keil MDK-ARM to develop your application.

    CodeSourcery g++ also support Cortex-M4.  Please use
      -march=armv7e-m -mthumb
    and optionally (if you want to use floating point)
      -mfloat-abi=softfp -mfpu=vfpv3xd

    Hope this help.
    regards,
    Joseph
Reply
  • Arm Employee Badge
    Note: This was originally posted on 28th May 2010 at http://forums.arm.com

    Hi Sarvesh,

    Programs compiled for Cortex-M3 work directly in Cortex-M4.
    (instruction set of Cortex-M4 is a superset of the Cortex-M3).
    So you can use RVDS to compile programs for Cortex-M3, and run it on Cortex-M4.

    Keil MDK-ARM (Microcontroller Development Kit, see www.keil.com/arm/)
    already have Cortex-M4 support.  For the moment I suggest you to use Keil MDK-ARM to develop your application.

    CodeSourcery g++ also support Cortex-M4.  Please use
      -march=armv7e-m -mthumb
    and optionally (if you want to use floating point)
      -mfloat-abi=softfp -mfpu=vfpv3xd

    Hope this help.
    regards,
    Joseph
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