5 years, 10 months ago.

Mbed export for uVision microlib

Trying to us microlib in uVision for a KL05z export and get these errors at the end of compiling when the linking process starts. No other errors

.\build\MBED_10.axf: Error: L6218E: Undefined symbol initial_sp (referred from entry2.o).

.\build\MBED_10.axf: Error: L6218E: Undefined symbol heap_base (referred from malloc.o).

.\build\MBED_10.axf: Error: L6218E: Undefined symbol heap_limit (referred from malloc.o).

Is it possible to use microlib in uVision with mbed exports?

I have same problem but I didn't find the similar file like startup_LPC1768.s under the mbed folder. I only find startup_LPC17xx.o file. so want can i do to fix this problem

posted by Akash Jivani 23 Mar 2016

This is the similar file for the LPC1768 that I changed for KL05z:

https://developer.mbed.org/users/mbed_official/code/mbed-dev/file/75b7d1f8d36d/targets/cmsis/TARGET_NXP/TARGET_LPC176X/TOOLCHAIN_ARM_MICRO/startup_LPC17xx.S

You will need to make changes and re-import it to Mbed because this file is unreadable in the online compiler. The changes I did was to use it in uVision. Do you need microlib? the LPC1768 does have 512k flash.

posted by Paul Staron 23 Mar 2016

1 Answer

Paul Staron
poster
5 years, 10 months ago.

I have worked out the answer here.

I replaced the fist part of the start up file ( startup_MKL05Z4.s ) by adding this code:

Original part of startup_MKL05Z4.s


__initial_sp        EQU     0x20000C00  ; Top of RAM

                PRESERVE8
                THUMB

Added this code:

Changed and added this


Stack_Size      EQU     0x00000200

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
                EXPORT  __initial_sp

Stack_Mem       SPACE   Stack_Size
__initial_sp            EQU     0x20000C00


; <h> Heap Configuration
;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Heap_Size       EQU     0x00000000

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
                EXPORT  __heap_base
                EXPORT  __heap_limit

__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit

                PRESERVE8
                THUMB

Initial tests indicate its working correctly, if the program remains stable, using MicroLIB has trimmed down my executable from 25.5k to 15.5k.

Perhaps MicroLIB should be used in Mbed for the smaller flash MCU's as default like it is for the LPC812 depending on pros and cons.

Accepted Answer

I have a similar problem when I using LPC1768 mbed. If I select the microlib, it give me following error. .\build\SingleJointAngle.axf: Error: L6218E: Undefined symbol aeabi_assert (referred from joint.o). .\build\SingleJointAngle.axf: Error: L6218E: Undefined symbol initial_sp (referred from entry2.o). .\build\SingleJointAngle.axf: Error: L6218E: Undefined symbol heap_base (referred from malloc.o). .\build\SingleJointAngle.axf: Error: L6218E: Undefined symbol heap_limit (referred from malloc.o).

However I didn't find the similar file like startup_LPC1768.s under the mbed folder. I only find startup_LPC17xx.o file. Could you suggest what I should do?

Does mbed online compiler using microlib as default? I am trying to keep consistent with it on my uvision 5.

cheers Kingwinter

posted by Jindong Liu 28 Jan 2015

hi jindong, you solve this problem ??

posted by Akash Jivani 23 Mar 2016