Difference between revisions of "How to debug with Serial Wire Viewer tracing on STM32MP15"

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This article provides some setup information for STM32MP15 serie, debugging Cortex-M in Production Mode. It does not intend to cover all STM32CubeIDE Serial Wire Viewer (SWV) capabilities; complete information is available in (UM2609), chapter 4. It only provides some setup information for STM32MP15 serie, debugging Cortex-M in Production Mode.

In that mode, the available console on the board (UART4) is used by Cortex-A Linux. The clock tree is managed by Linux and 'Trace clock' needed to setup SWO is available from Linux console with command:
awk '/ck_trace/{print $5}' /sys/kernel/debug/clk/clk_summary

In order to test, let's modify main.c file from a generated project with a looping variable 'i', as depicted hereafter.

File:Swv-traceclk-linux-main.png
Trace clock from Linux console



Then, setup debug configuration, enabling SWV and setting the clock: 133.25MHz here.

File:Swv-dbg-cfg.png
Debug Configuration with SWV enabled



Stopping Debug session, open Serial Wire Views: Window > Show View > Other... > SWV > SWV Trace Log & SWV Data Trace.
In SWV Trace Log > Configure Trace menu, setup Comparator 0 in order to spy variable 'i'.


File:Swv-settings.png
SWV Setting
Then start the trace

Resuming debug session gives inside SWV Data Trace view the corresponding graphic.

File:Swv-data-trace.png
SWV Data Trace Output
This article provides some setup information for STM32MP15 serie, debugging Cortex-M in ''Production Mode''. It does not intend to cover all STM32CubeIDE Serial Wire Viewer (SWV) capabilities; complete information is available in  ([[STM32MP15 resources#UM2609|UM2609]]), chapter 4. It only provides some setup information for STM32MP15 serie, debugging Cortex-M in ''Production Mode''. 
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In that mode, the available console on the board (UART4) is used by Cortex-A Linux. The clock tree is managed by Linux and 'Trace clock' needed to setup SWO is available from Linux console with command:  <br>

'''''awk '/ck_trace/{print $5}' /sys/kernel/debug/clk/clk_summary'''''<br>
<br>

In order to test, let's modify main.c file from a generated project with a looping variable 'i', as depicted hereafter.<br>

[[File:Swv-traceclk-linux-main.png|frame|center|''Trace clock from Linux console'']]<br>
<br>

Then, setup debug configuration, enabling SWV and setting the clock: 133.25MHz here.<br>

[[File:Swv-dbg-cfg.png|frame|center|''Debug Configuration with SWV enabled]]<br>
<br>

Stopping Debug session, open Serial Wire Views:  ''Window > Show View > Other... > SWV > SWV Trace Log & SWV Data Trace''. <br>

In ''SWV Trace Log > Configure Trace'' menu, setup ''Comparator 0'' in order to spy variable 'i'. 
[[File:SWVConfigureTraceButton.png|none|frameless]]<br>

[[File:Swv-settings.png|frame|center|''SWV Setting'']]

Then start the trace [[File:SWVStartTraceButton.png|none|frameless]]
Resuming debug session gives inside ''SWV Data Trace'' view the corresponding graphic.  <br>

[[File:Swv-data-trace.png|frame|center|''SWV Data Trace Output'']]
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[[Category:STM32CubeIDE|51]]</noinclude>
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This article does not intend to cover all STM32CubeIDE Serial Wire Viewer (SWV) capabilities; complete information is available in  ([[STM32MP15 resources#UM2609|UM2609]]), chapter 4. It only provides some setup information for STM32MP15 serie, debugging Cortex-M in ''Production Mode''.  
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This article provides some setup information for STM32MP15 serie, debugging Cortex-M in ''Production Mode''. It does not intend to cover all STM32CubeIDE Serial Wire Viewer (SWV) capabilities; complete information is available in  ([[STM32MP15 resources#UM2609|UM2609]]), chapter 4.  
 
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[[File:Swv-data-trace.png|frame|center|''SWV Data Trace Output'']]
 
[[File:Swv-data-trace.png|frame|center|''SWV Data Trace Output'']]
 
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