stm32wlx: SWOTrace not working

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#22 opened on Sep 6, 2023 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Domain: devtools, embedded-iot

Research direction

Start with target/stm32wlx.cfg and the supplied OpenOCD configuration; compare the STM32WLX setup with the referenced STM32WB scripts, focusing on SWO/TPIU initialization for the dual-core target. Reproduce the problem after power removal and verify that SWOTrace works without first enabling it in STM32CubeIDE, with SB8 bridged on the board.

Written by the indexing model from the issue text.

Description

I have been evaluating the nucleo-wl55jc1 and have deployment and debugging working via openocd (just single core at the moment). I am currently running "xPack Open On-Chip Debugger 0.12.0+dev-01312-g18281b0c4-dirty (2023-09-04-22:31)" a very recent build by xPack.

We use SWOTrace quite extensively, especially on devices that lack UART peripherals, however I have had trouble getting it to work with target/stm32wlx.cfg. My complete configuration derived from other working f1x, f4x, l4x parts : -

`source [find interface/stlink.cfg]

transport select hla_swd

source [find target/stm32wlx.cfg]

itm port 0 on
tcl_port 6666

tpiu create stm32wlx.cpu0.tpiu -dap stm32wlx.dap -ap-num 0
stm32wlx.cpu0.tpiu configure -protocol uart -traceclk 32000000 -output swo_out -formatter off -pin-freq 1000000
stm32wlx.cpu0.tpiu enable
`

Using this configuration SWOTrace only works if I enable and use it with STMCubeIDE first, this only seems to work with the "ST-LINK (ST-LINK GDB Server)" debug probe using the SWV capabilities of the IDE. I couldn't get "ST-LINK (openocd)" to work at all. The device will then work fine with SWOTrace until I remove power to the device. I suspect there are missing register changes in the openocd configuration, this might have something to do with the dual-core nature, but I did look at scripts for other parts like stm32wb but didn't notice anything different.

Note that I found that SB8 on the dev board requires a solder bridge for SWO to be passed to the built-in STLink device.

Dominant language: C
Stars: 202
Forks: 57
PR merge metrics: No merged PRs in 30d

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