There is power timing variability in sd card brands- try sandisk You could also try a power cycle (wait 10 seconds in off state) on your shimmers vs removing cards which is giving a definite power down to reset media from spi to sd mode
On Feb 29, 2012, at 7:57 AM, steve ayer <[email protected]> wrote: > hi klaus, > > this is a host-side issue, with different drivers and operating > systems/environments giving varying results. > > "do not adjust your set. the trouble is not in your set." > > i wish i had better news, > > steve > > On 02/29/2012 06:02 AM, Klaus-Hendrik Wolf wrote: >> Dear all, >> >> For one of our new settings we would like to use the shimmer as a >> recording device only and have the subjects collect the data from the SD >> card via an USB connected dock. >> >> During our testing we came across a problem which hopefully you know how >> to solve or work around. >> >> Inserting the shimmer into the dock *sometimes* results in it being >> discovered by the connected computer as a new medium in the >> corresponding block device (monitored with udevadm monitor). >> With my latest tests this *sometimes* unfortunately means: not very often. >> >> We first discovered this behavior with our own firmware, but it is >> reproducible with the justfatlogging app as well. I have tested at least >> four different shimmers (2r), so it should not be a hardware problem. >> >> I tried different combinations of resetting the shimmer (in and out of >> the dock), disconnecting and reconnecting the dock (shimmer in and out), >> but found no combination that is working in most cases. >> >> A work-around for justfatlogging i have found is to remove the SD card, >> reset the shimmer, insert the card and after that put it in the dock. >> >> But disassembling and removing the SD card is not really an option for >> our study. >> >> Does anyone of you have an idea how to make docking more reliable? >> If it is only one out of three it would still be OK. >> Even a workaround would be welcome! (As long as it does not involve >> opening the shimmer) >> >> Best regards, >> >> Klaus Hendrik >> _______________________________________________ >> Shimmer-users mailing list >> [email protected] >> https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > _______________________________________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users _______________________________________________ Shimmer-users mailing list [email protected] https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users
