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PSoC 6

AlSa_1585471
New Contributor

Hello,

would like to have an very simple example how to share variables between CM0 and CM4 cores.

variable "a" should be used in cm0p.c and cm4.c

I have already read about IPC, but dont understand yet how it works.

It is a lot of code in examples, i am confused

There is no project to upload, because i have just started an new schematic with 1 LED from cy8ckit-062 kit.

I want toggle varible a i cm0p.c and act in cm4.c.

Can please anyone help?

Thanks and best regards

Alex

0 Likes
1 Solution
BragadeeshV
Moderator
Moderator

Hi info_1585471​,

I checked your code. The issue is that your variables have been assigned different memory locations in each of the cores.

(.map file in results)

cmoplus:

.mysection      0x08020000        0x4

*(.mysection)

.mysection     0x08020000        0x4 .\CortexM0p\ARM_GCC_541\Debug\main_cm0p.o

                0x08020000                Blue_On

                0x08020001                Red_On

                0x08020002                SW2_button

                0x08020003                Green_On

CM4:

.mysection      0x08020000        0x4

*(.mysection)

.mysection     0x08020000        0x4 .\CortexM4\ARM_GCC_541\Debug\main_cm4.o

                0x08020000                SW2_button

                0x08020001                Blue_On

                0x08020002                Red_On

                0x08020003                Green_On

You can force contiguous memory locations by putting all these into a structure or you may have to define separate sections in your linker file for each variable.

I have added the modified project where I have defined a structure for all the variables and your code worked as expected

volatile struct

{

uint8 Green_On ;

uint8 Red_On;

uint8 Blue_On ;

uint8 SW2_button;

}check  CY_SECTION(".mysection");

Regards,
Bragadeesh

View solution in original post

4 Replies
AlSa_1585471
New Contributor

Hello Ankita,

i have allready seen the reply from Mark, and his example from here Re: How to set up shared memory between CM4 and CM0p

works.

But if i modify it a little bit, it doesnt work anymore.

I have attached my really simple project.

It is running on psoc6 wifi-bt kit.

I am really confused, why it is not running well, would be glad if somebody can check it.

Thanks very much.

Best regards

Alex

0 Likes
RodolfoGL
Employee

There are two code examples that use the IPC low level driver to implement high level abstraction concepts - Pipes and Semaphore. They are way simpler.

https://www.cypress.com/documentation/code-examples/ce223820-psoc-6-mcu-ipc-pipes

https://www.cypress.com/documentation/code-examples/ce223549-psoc-6-mcu-ipc-semaphore

Hope this helps.

0 Likes
BragadeeshV
Moderator
Moderator

Hi info_1585471​,

I checked your code. The issue is that your variables have been assigned different memory locations in each of the cores.

(.map file in results)

cmoplus:

.mysection      0x08020000        0x4

*(.mysection)

.mysection     0x08020000        0x4 .\CortexM0p\ARM_GCC_541\Debug\main_cm0p.o

                0x08020000                Blue_On

                0x08020001                Red_On

                0x08020002                SW2_button

                0x08020003                Green_On

CM4:

.mysection      0x08020000        0x4

*(.mysection)

.mysection     0x08020000        0x4 .\CortexM4\ARM_GCC_541\Debug\main_cm4.o

                0x08020000                SW2_button

                0x08020001                Blue_On

                0x08020002                Red_On

                0x08020003                Green_On

You can force contiguous memory locations by putting all these into a structure or you may have to define separate sections in your linker file for each variable.

I have added the modified project where I have defined a structure for all the variables and your code worked as expected

volatile struct

{

uint8 Green_On ;

uint8 Red_On;

uint8 Blue_On ;

uint8 SW2_button;

}check  CY_SECTION(".mysection");

Regards,
Bragadeesh

View solution in original post

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