SWV ITM Data Console on Dual Core M7 & M4 of STM32H755

[Domy_ST]

I'm working on my first development projects on the STM32H755, which has two M7 and M4 cores. I need to display the printout on the ITM console while debugging. For example:

The main.c file of M7 has the following code:

.....
while(1) {
printf("Welcome Cortex-M7\n");
HAL_Delay(2000); }
.....

The same is true in the main.c file of M4 with the following code:

.....
while(1) {
printf("Welcome Cortex-M4\n");
HAL_Delay(1000);}
.....

Before debugging, I configured the ITM console with SWV on the STM32CubeIDE environment, following the YouTube video:

https://www.youtube.com/watch?v=Zwylu6ma9gU 

https://www.youtube.com/watch?v=k3mXhPZSasw 

Then I enabled SWD to both the M7 and M4 cores in the Debugger option with the same clock frequency (64.0 MHz), port 0 for the M7 and port 3 for the M4.

Based on this configuration, during debugging, I see the "Welcome Cortex-M7" character printed, so debugging for the M7 is working correctly. However, I don't see the "Welcome Cortex-M4" character printed on either port 0 or port 4. The SWD of M4 has the same configuration as the M7.

What's wrong?

Thanks for your support.

[Domy_ST]

Hello ST Community,

Has anyone had a similar problem? How did you solve it, if any of you have?

Thanks.

[Souhaib MAZHOUD]

---

@Domy_ST wrote:

Then I enabled SWD to both the M7 and M4 cores in the Debugger option with the same clock frequency (64.0 MHz), port 0 for the M7 and port 3 for the M4.

 I don't see the "Welcome Cortex-M4" character printed on either port 0 or port 4. 

---

Could you please ensure your configuration, which port did you enabled for M4 port3 or port4?

KR, Souhaib

[Domy_ST]

Hi @Souhaib MAZHOUD ,
Here are the screenshots of the configuration I set up for STM32CubeIDE 2.0.0.

for the M7 debugger:

M7 Debugger

for the M4 debugger:

M4 Debugger

as you can see for M7 it is set to port 0, and the m4 to port 3.

On the ITM console I see only port 0 of the M7 printing while port 3 on the M4 does not print anything, as shown in the screenshot below:

Port 0 on M7 and Port 3 on M7 is empty

ITM Data Console Port0 and Port3

what's wrong?

Thanks.

[Domy_ST]

Hello ST Community,

is there any idea to fix the problem?

Thanks.

[Souhaib MAZHOUD]

Hello @Domy_ST 

Actually, there is a limitation when using SWO in CM4 for STM32H755. Only one core's trace output can be connected to the physical SWO pin. 

You can refer to this post Solved: Best practices for instrumentation logging with du... - STMicroelectronics Community, which provides a detailed explanation.

BR, Souhaib