Status of the framework

So I'm on my flight back from Taiwan now after spending three weeks at the Openmoko office in Taipei working on the FSO middleware. I believe we have made a lot of progress during that time and I'm quite happy about the general state of our middleware.

I'll give a brief overview of what we accomplished during our stay and in some later posts I will write some tutorials demonstrating the possibilities the FSO stack offers you.

  • The whole phone stack now supports the UCS2 charset. This means that sending and receiving Chinese SMS will work, as well as saving contacts with Russian names on your SIM.
  • The resource handling has been revamped completely which removes some ugly hacks in the power handling of the GSM and GPS chips. The usage daemon doesn't have any hard coded knowledge of what resources are present on a given device, Instead resources register themselves with the usage daemon. Simple resources are still handled by odeviced, more complex ones like GSM and GPS are handled by their respective daemon. Suspending and resuming the resources is also handled by ousaged.
  • All DBus calls dealing with SMS have an additional a{sv} parameter for optinal/advanced properties. At the moment this includes getting the SMSC timestamp, fields for port addressing and fields for CSM (concatenated short messages). There have also been some other changes (warning, API breakage!) in org.freesmartphone.GSM.SIM SMS related functions as we added direct sending and receiving of SMS (through org.freesmartphone.GSM.SMS).
  • Tasklets are being used by ousaged and ogsmd now, supposedly making the code flow easier to follow (I still need to understand them :-)
  • The GPS subsystem has made some really nice improvements. Quite some bugs in the warmstart path for the ublox chips got fixed which should improve the time to first fix considerably if you already have ephemeris data. There are still some quirks I need to investigate, but I believe it should be possible to get down to 10 seconds ttff easily. Also SBAS is now enabled by default and if you are lucky enough to pick up one of the geostationary satellites sending out correction data your accuracy is going to increase to 2m or better. GTA01 GPS is now also much better supported, see my last post on that.
  • The rules syntax in oeventsd changed as we try to get to a rules system that is powerful yet easy to read and understand for normal users.

Besides coding we also discussed what next issues we want to tackle, but that's something I'll mail to the mailing list (om-devel and smartphones-standards) as soon as I've had the time to write up the mail.

Let me just conclude by saying that I enjoyed the last three weeks a lot and I'm looking forward to visiting Taipei again sometime next year! :-)

Posted by daniel 12/10/2008 at 22:08


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