Kinetis MicrocontrollersのトピックRe: insufficient heap size at a released demo project

insufficient heap size at a released demo project

tirak — Sun, 11 Mar 2018 12:58:56 GMT

I cannot understand why the NXP support team releases a demo for the MK60 tower board

-> twrk60d100m_demo_apps_lwip_lwip_ping_freertos

that leads into a failed compilation cos insufficient heap size.

After some invastigation I figured out it is a problem of the 2 RAM areas of the M4 core

(unfortunately I realized this only after this issue occured)

But why NXP releases a demo that doesn't work? For a beginner it is not funny.

Is it a M4 problem or a special NXP design issue?

c:/nxp/mcuxpressoide_10.1.1_606/ide/tools/bin/../lib/gcc/arm-none-eabi/6.3.1/../../../../arm-none-eabi/bin/ld.exe: twrk60d100m_demo_apps_lwip_lwip_ping_freertos.axf section `.heap' will not fit in region `SRAM_UPPER'
SRAM_UPPER: 82240 B 64 KB 125.49%

So how can I fix this problem without run into danger the CPU makes an access at this border 0x20000000

And how can I tell the linker to set for example an fixed array[4096] into the SRAM_LOWER area

Marcus

Re: insufficient heap size at a released demo project

BlackNight — Mon, 12 Mar 2018 06:47:52 GMT

There is a memory boundary at 0x2000'0000 because of the two memory controllers. See FreeRTOS Heap with Segmented Kinetis K SRAM | MCU on Eclipse for a discussion and how to allocate the heap into different memory areas.

If you would like to have multiple memory regions, see the following article.:

Using Multiple Memory Regions with the FreeRTOS Heap | MCU on Eclipse

I hope this helps,

Erich

Re: insufficient heap size at a released demo project

tirak — Tue, 13 Mar 2018 18:40:52 GMT

Not really. Cos I don't know how to mage it with MCUExpresso. All your

examples refer to Kinetis Studio and Processor Expert.

Do you suggest to use this IDE?

Am 12.03.2018 um 07:48 schrieb BlackNight:

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Re: insufficient heap size at a released demo project
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Re: insufficient heap size at a released demo project

jingpan — Thu, 15 Mar 2018 03:26:44 GMT

Hi,

Currently twrk60d100m_demo_apps_lwip_lwip_ping_freertos is not supported by MCUXpresso. You can see the readme file in its directory. If you want to use MCUXpresso, you can open a twrk60d100m_demo_apps_lwip_lwip_ping_bm and copy related file to that project.

Regards,

Jing

Re: insufficient heap size at a released demo project

tirak — Thu, 15 Mar 2018 18:34:19 GMT

Ok, thanks...

There is one question open. How can I set fixed memory like array[1024] to a fixed address.

How can I tell it the linker?

I know this is a C language question but I would not have it when this ristriction of the memory didn't exist.