KSDK memory footprint on KL15Z128

[noamziv]

I have a working project written under KDS2.0, PE and MQX Lite.

I am trying to migrate it to KSDK1.3, KDS3.0 and MQX Lite - trying to get ready for a KW processor.

However, when using the Freescale OS abstraction layer and associated drivers, my project no longer fits into the RAM and ROM on the device (it did when I used KDS2.0, PE and MQXLite).

Is there a way to reduce the memory footprint (code and RAM) of code generated by KSDK3.0?

Any other ideas?

Thanks!

[Jorge_Gonzalez]

Hello Noam:

Besides of Iva's good suggestion about optimization, please also check that you add the NDEBUG macro. See this discussion:

Size Project with Processor Expert

Regards!

Jorge Gonzalez

[noamziv]

Hi Jorge and Iva,

Adding NDEBUG did the trick.  I'm back to porting.

As far as optimization goes:

Is it possible to use different optimization levels for KDSK/libraries generated code and my code?

if so, how would I do it?

Thank you SO MUCH for your quick and helpful responses.

Noam

[ivadorazinova]

Hi Noam,

sure, you can use different optimization levels for libraries and for your project.

In case of GCC, please take a look at Forcing/Checking Kinetis Compiler Optimization Level | MCU on Eclipse

also helpful for you could be Optimize Options - Using the GNU Compiler Collection (GCC) which describes all optimization flags.

I hope this helps you.

Best Regards,

Iva

[ivadorazinova]

Hi Noam,

please try to do Optimization separately for your project and libraries.

You can look here, http://cache.nxp.com/files/microcontrollers/doc/user_guide/KDSUG.pdf page 44

Specify the optimizations that you want the compiler to apply to the generated object code:

• None (-O0) - Disable optimizations. This setting is equivalent to specifying the -

O0 command-line option. The compiler generates unoptimized, linear assembly-

language code.

• Optimize (-O1) - The compiler performs all target-independent (that is, non-

parallelized) optimizations, such as function inlining. This setting is equivalent to

specifying the -O1 command-line option. The compiler omits all target-specific

optimizations and generates linear assembly-language code.

• Optimize more (-O2) - The compiler performs all optimizations (both

targetindependent and target-specific). This setting is equivalent to specifying

the -O2 command-line option. The compiler outputs optimized, non-linear,

parallelized assembly-language code.

• Optimize most (-O3) - The compiler performs all the level 2 optimizations, then

the low-level optimizer performs global-algorithm register allocation. This setting

is equivalent to specifying the that is usually faster than the code generated from

level 2 optimizations.

• Optimize size (-Os) - The compiler optimizes object code at the specified

Optimization Level such that the resulting binary file has a smaller executable

code size, as opposed to a faster execution speed. This setting is equivalent to

specifying the -Os command-line option.

• Optimize for debugging (-Og) - The compiler optimizes object code at the

specified Optimization Level such that the resulting binary file has a faster

execution speed, as opposed to a smaller executable code size.

After doing that you can print size of the project

In my case - I did Optimization for the KSDK demo without optimization None (-O0),

before optimization there was result

and after setting optimization for all libraries (building as well) and project with option Optimize size (-Os)

there was this result

Be careful and consistently test the functionality of your code