S32 Design Studio中的主题 Re: How can i use the same variables in different sub-project using S32DS?

How can i use the same variables in different sub-project using S32DS?

timwang — Thu, 12 Oct 2017 09:01:31 GMT

I want to use core0 to receive some CAN data,and then transmit these data to the terminal by using core1.So i write some code in these two sub-project,how can i transmit the data which i received in project Z4_1 in project Z4_2?

My development board is devkit-mpc5748g。

The following attachment is my project！

Regards

Original Attachment has been moved to: enet_rmii_udp.rar

Re: How can i use the same variables in different sub-project using S32DS?

jiri_kral — Thu, 12 Oct 2017 10:33:50 GMT

Hello,

you can use shared memory. Here is example for multi-core shared memory usage:
https://community.nxp.com/docs/DOC-335344

Example is for S32R274, but you can use this technique for MPC5748G too.

Jiri

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Fri, 13 Oct 2017 02:42:06 GMT

Hello Jiri,

I have added these two files shared_mem and shared_func into my project.But i still have thses faults,do i have to make some other configuration?

Regards

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Fri, 13 Oct 2017 03:04:24 GMT

Do i have to add the two files into all the sub-project?

In this example,only the z7_0 project contain the 'shared_mem' and the 'shared_func' file.

Regards

Re: How can i use the same variables in different sub-project using S32DS?

jiri_kral — Fri, 13 Oct 2017 06:39:48 GMT

Hi,

you also need to modify linker files for all cores. Please check the linker files in the example and your project (Your Project Name->Project_settings->Linker_files). You need to add path for shared objects (shared_mem.o and shared_func.o) into project settings (see screenshot bellow). Source codes - shared_mem.c and shared_func.c needs to be build by the firstly built core project (one of the cores is always build as the first and I can't find way how to change the build sequence - looks like that it is alphabetically sorted).

The basic idea is

one memory space and starting address shared across cores (one instance for all cores) - technically linked shared_mem.o object on the very same address for each core
usage semaphores for accessing shared memory (one instance per core) - technically linked shared_func.o on unique address for each core.

Here is linker file with added shared mem location:

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Fri, 13 Oct 2017 09:06:26 GMT

Hi Jiri,

Thank you very much !

It works for me!

But i still have this problem.As the picture showed below,In project Z4_1,i have change the value of the Tx_Message which is a shared variable，but in project Z4_2,the value of the Tx_Message is still previous value,Why?How can i solve this problem?

Thanks

Regards

Re: How can i use the same variables in different sub-project using S32DS?

jiri_kral — Fri, 13 Oct 2017 10:28:44 GMT

There may be couple reasons. Are you unlocking shmem access? Do you have only one source code for shmem/shfunc in the Z2_3 project and for other cores is linked object file from Z2_3 core?

If you attach your update project - I'll look at it.

Jiri

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Fri, 13 Oct 2017 13:34:14 GMT

Hi Jiri,

I'm sure that i do all these configuration as you say.

Now,i attach my project below,if you have some free time,please look at my project.

Apologize for taking up your time.

Thank you very much!

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Fri, 13 Oct 2017 14:16:33 GMT

I still have a question that when i import a project,in debug process,if i want to set a breakpoint in Z4_2 project,it always can not be effective,and the console window shows these messages：

And the breakpoint in Z4_1 project is effective.

Regards

Re: How can i use the same variables in different sub-project using S32DS?

jiri_kral — Mon, 16 Oct 2017 08:48:05 GMT

Hi,

I tested your project - and for me it is working normally. But I used test data only (no real message from ethernet).It is good idea to add some flag in the shared memory - like NewDataReady - and Core 2 should process incoming data only when new data is ready.

In attachment is project with test values.

Re: How can i use the same variables in different sub-project using S32DS?

jiri_kral — Mon, 16 Oct 2017 08:52:20 GMT

I have no issue about sources. Did you start debug session as a launch group?

Your issue also may be caused by spaces in the path - like "S32 Design IDE". You can try to locate your workspace in the path without spaces.

Jiri

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Mon, 16 Oct 2017 09:38:00 GMT

Hi Jiri,

Actually,in core0 ,i keep receiving data from CAN_0,and store the data in Tx_Message.In core1,i read the data in Tx_Message and transimit them by ENET.

My problem is that in core1,only the first data in Tx_Message can be read normally.When the data that core0 received changed,Tx_Message should also change.But in Z4_2 project,the Tx_Message didn't change.

For example,the data that core0 recevied first are{253,53,86,102},then the data changed to {10,55,86,102},the Tx_Message shoule change to{10,55,86,102}.But on debugging,if i choose the Z4_1 debug,the Tx_Message are{10,55,86,102}, if i choose the Z4_2 debug,the Tx_Message are still{253,53,86,102}.

The pictures below show the state

I dont't know why it happend.Please help me.

Thank you!

Re: How can i use the same variables in different sub-project using S32DS?

jiri_kral — Mon, 16 Oct 2017 11:23:28 GMT

Hi,

this is really strange. But technically - there is only one Tx_Message instance on address 0x400B8090 - as you can see in your debug window. I can't reproduce it with test data. You have enabled I_CAHE and D_CACHE for Z4_2 core - try to remove these defines from your project settings for test:

I also can't see any difference on screenshots - may be I don't get the correct order. there are the very same data on picture #1 and #2 and different same data on #3 and #4.

Jiri

Re: How can i use the same variables in different sub-project using S32DS?

timwang — Tue, 17 Oct 2017 01:36:21 GMT

Hi Jiri,

Thank you very much!

Disabling I_CAHE and D_CACHE for Z4_2 core works for me！

Regards