Thanks Gerhard for your thoughts. - As a fallback, instead of repeating the last value, I opted for inserting a single value of -1.0 to signal the change of recording. This helps aligning the measurements with timestamps times printed by sr_err().
- I did some further experiments but dBA/dBC seems to be the only useful flag that can be recovered. So, here's the commit on github: https://github.com/mguillau/libsigrok/commit/8cc328fdee3f98ad7ae85e1e2cc57f947bb3f6e9 Happy to receive some feedback, Matthieu On Mon, Nov 28, 2016 at 2:50 PM, Matthieu Guillaumin <[email protected]> wrote: > Hi, > > I finally had some time to play with my pce-322a and now I'm almost > done with a first implementation of recovering its memory. I have a > few questions though: > > - The memory is a sequence of recordings that start with a header > (containing some flags and a timestamp). This timestamp is obviously a > very important piece of information about past recorded measurements, > but I haven't found any way to provide them to the sr_session_send() > function. Right now I can only print the timestamps on stderr using > something like sr_info(), so it's pretty lame, since stderr and stdout > need not be synced. Do you have any suggestion on how to handle this > before I submit a patch? > > - I still haven't fully figured out all the semantics of the header > flags. Is it ok to submit a patch with only partial support? > (currently, it only supports the dBA/dBC flag of recordings, not fast > vs. slow nor measurement ranges) > > - Experimenting with my pce-322a device has unearthed some minor > differences with what is currently described on the wiki page [*]. I'd > be happy to update the page if you gave me an account. It could be > interesting to see if the differences are due to variations of the > model or incomplete reverse-engineering by the original author (in > CC). > > Matthieu > > [*] https://sigrok.org/wiki/PCE_PCE-322A > > On Sat, Oct 1, 2016 at 12:24 PM, Uwe Hermann <[email protected]> wrote: >> Hi, >> >> On Thu, Sep 29, 2016 at 08:16:45AM +0200, Matthieu Guillaumin wrote: >>> Hi, >>> >>> I'm a happy user of sigrok with my pce-322a SPL logger (I use it with a >>> imx6-based cubox device with debian jessie, and it's working great). So >>> first of all, thanks a lot for this library! >>> >>> There's one thing though that I haven't been able to do yet, which is, >>> download the internal memory of the pce-322a (which contains recordings >>> that I made on the go). Looking at the support wiki page ( >>> https://sigrok.org/wiki/PCE_PCE-322A ), it seems that there is support for >>> reading the memory, but I cannot seem to find how to invoke this >>> functionality via sigrok-cli. >> >> The driver currently doesn't seem to have support for that. It's usually >> done using the SR_CONF_DATA_SOURCE key, see e.g. uni-t-ut32x or >> kecheng-kc-330b for examples, which you can use from sigrok-cli via the >> "data_source" option (to specify whether you want live data or data from >> an internal memory of the device usually). >> >> The protocol seems documented in the wiki indeed, so it should be doable >> to create a patch to add support for this to the pce-322a driver if you >> want to give it a try. >> >> >> Cheers, Uwe. >> -- >> http://hermann-uwe.de | http://randomprojects.org | http://sigrok.org ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ sigrok-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sigrok-devel
