USB LDD K40 link error

[FredF]

I have posted a similar message to the MQX forum, but I was not sure if this forum would be more appropriate. If the USB LDD is added to the bsp_twrk40x256_pe BSP project in CW 10.1 using MQX 3.7, a link error occurs indicating that "_mem_alloc_system_align" is not defined when the pe_demo_twrk40x256 MQX sample project is built. I have not found any reference to this function in the MQX documentation.  This code is generated by Processor expert, and I do not know how to resolve the erorr.

[hard_ware]

Hello,

I got exactly the same error, I think its is related to the not included USB lib, but could not resolve it till now.

[FredF]

I was able to resolve the error by linking the USB libraries.  Thanks for the suggestion.

[hard_ware]

Glad to could help you, could you please tell the steps how you get it compiled, I tried to add the USB lib to project and included the USB.h but still get the

Undefined : "_mem_alloc_system_align"

error.

[FredF]

My previous post was not correct since there was a mismatch in the LDD names, so the code was not actually being linked. This is the repsonse I received from a sevice request that resolved the issue.

We made a quick analysis and there seem to be two problems:

- The funtion _mem_alloc_system_align seems not to be present in latest MQX.
So as the customer correctly observed, it's necessary to use _mem_alloc_align instead.

- The _mem_alloc_align is available only if the BSP and PSP is recompiled with the option MQX_USE_LWMEM_ALLOCATOR set to 0.
It should help adding #define MQX_USE_LWMEM_ALLOCATOR 0 to for example small_ram_config.h file, before this symbol is used."

For a current workaround you can use "_mem_alloc_align", enable the allocator macro and recompile the BSP/PSP.

Processor Expert team is getting more details on the best solution for these problems so that they get fixed for further releases of PExpert.

[ProcessorExpert · Accepted solution]

Hello,

the solution of the issue is here:

https://community.freescale.com/thread/100242

best regards
Vojtech Filip
Processor Expert Support Team