[feature] st-util with SWO support possible?

[mhanuel26]

• [x] Stlink/v2-onboard
• [x] Linux
• [x] st-util
• [x] STM32F769 Discovery

I was wondering if it's possible to have SWO output from target. It will be great to have sort of printf window for debug messages. The closest minimalist solution I have found is explained here, but depends on STM32 ST-Link Utility or Keil uVision for it.

Please let me know your thoughts,

[xor-gate]

Its possible, but not implemented. OpenOCD has support for this to write ITM port 0 or 1 to a file.

[shizacat]

Hello, Do you plan to implement swo?

[romansavrulin]

+1 on SWO feature

[langhaarschneider]

also +1 on SWO feature

[simplerobot]

Hi @mhanuel26, @shizacat, @langhaarschneider, The stlink project now contains a st-trace utility program that will read SWO output from a target. (Run "st-trace --help" for more details.) Does this meet your needs? If not, can you explain how you would like this to work?

[Ant-ON]

@simplerobot Viewing the SWO output while debugging would be a nice touch. Currently only the semihosting is supported: https://github.com/stlink-org/stlink/blob/01418b5666c72ce802ea5af88b62dc9aa06c8c3e/src/st-util/gdb-server.c#L1423-L1481

[ChrisIdema]

I really need this feature. I see it is added to the list of release v1.7.1. When can I expect the release of v1.7.1?

[Nightwalker-87]

Currently no date or time frame is planned for any new release. This is because development is currently mostly on hold within this project, see also: https://github.com/stlink-org/stlink/discussions/1223

[Nightwalker-87]

I'd consider this a useful feature as well. Who can help out on this topic? Does anybody have an idea how to implement this?

[linuxguy123]

What is the status of SWO working with STLink (st-util) such that Cortex-Debug and uScope (RTT viewer, https://github.com/DEMCON/uscope) can use it ?

If it now does work, does one need to reflash the STLink device to make SWO work or just update st-util ?

If it doesn't work, what can I do to help the situation ?

[linuxguy123]

Hi @mhanuel26, @shizacat, @langhaarschneider, The stlink project now contains a st-trace utility program that will read SWO output from a target. (Run "st-trace --help" for more details.) Does this meet your needs? If not, can you explain how you would like this to work?

Speaking as a VSCode user, how would I configure VSCode to work with st-trace ? Let's assume I want to use uScope (https://github.com/DEMCON/uscope) as my rtt viewer.

[Nightwalker-87]

@linuxguy123 There have been no action or any efforts on this topic since the last response of @Ant-ON. I personally can't contribute to this topic, sorry.