#openocd on 2025-05-19 — irc logs at libera.catirclogs.org

2021-05-27 14:41 NishanthMenon changed the topic of #openocd to: this is the place to discuss all things OpenOCD | Logs: https://libera.irclog.whitequark.org/openocd/

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09:39 <braunr> hello

09:40 <braunr> when using itm with a jlink, openocd tells me "jaylink_swo_read() failed: device: unspecified error"

09:40 <braunr> i'm careful to write to the itm only when its fifo is ready

09:41 <braunr> the swo pin frequency is automatically detected so i wouldn't expect a logic level change rate issue

09:41 <braunr> what i am doing wrong ?

10:15 <karlp> does it do this all the time? only sometimes? has this jlink ever worked?

10:17 <braunr> yes it ususally works very well

10:17 <braunr> usually*

10:17 <braunr> i think it's related to the amount of data being transmitted

10:17 <braunr> i usually don't have as much being transferred

10:17 <braunr> but i expected some messages to be lost, not low level errors

10:37 <braunr> could my swo cable be too long for the frequency ?

10:54 * karlp shrugs wouldn't expect a jaylink read failure then, just corruped data.

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15:16 <braunr> the signal looks fine

15:16 <braunr> could openocd be too slow compared to the input rate ?

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15:24 <braunr> or rather than openocd, could the jlink usb interface be too slow to transfer everything

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22:02 <zapb_> braunr, I would assume that the SWO buffer is not large enough

22:02 <zapb_> you could try to allocate more memory (change jlink.c driver) and check whether you still experience this error

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22:21 <braunr> zapb_: seems reasonable, i'll try that, thanks

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22:25 <zapb_> braunr, what jlink adapter do you have?

22:25 <zapb_> braunr, please let me know if you have success

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