devel May 2012

devel@libdivecomputer.org

2 participants
2 discussions

Re: Tine subsurface updates
by Jef Driesen 07 May '12

07 May '12

Hi, For those not on the subsurface mailinglist, you can read the first part of this discussion here: http://lists.hohndel.org/pipermail/subsurface/2012-May/000208.html On 2012-05-03 17:58, Linus Torvalds wrote: > It's the *ugly* and pointless breakage that I get so upset about. It > makes things harder for everybody for no actual reason. And it is > indicative of the same old "I don't think of libdivecomputer as a > library, I think of it as a random collection of internal routines" > problem. > > Interfaces are important. Even during development. They are doubly > important when it's a library that other projects use. Let's try to approach this discussion from another perspective. In the past, the libdivecomputer library provided no official releases, and there was just a single development branch (git master) where all the work was done. This development model didn't work well for applications, and therefore I introduced the new model with the 0.1.0 release. My idea was to proceed as follows: 1. We keep git master as the main development branch. This is where all the work towards the next stable release happens. New features can be introduced and backwards compatibility isn't guaranteed. 2. Stable releases (e.g. v0.x.0) are provided at the end of each development cycle. 3. Whenever bugfixes for a stable release are necessary, a new release branch is created. Only bugfixes are allowed here, and backwards compatibility is maintained. Releases from this branch will increment the micro number only (e.g. v0.x.y). This development model would allow me to introduce backwards-incompatible changes incrementally and also faster (e.g. no need to delay breaking changes). Applications should stick to the stable releases, and therefore require updating only when upgrading to the next stable release. Any incompatible changes will be documented with the new release. No more unexpected breaks anymore. Support for older versions can be kept by conditional compilation based on the libdivecomputer version macros. I assumed this would be a huge improvement compared to the previous situation, because it keeps the pain for applications to a minimum, while still providing enough flexibility to commit work-in-progress to the development branch. At some point, once we're all satisfied with the public api, we can move to v1.0.0 and never break backwards compatibility again. But let's concentrate on the road towards that goal first. If you (or anyone else) think this is not the right way to proceed, please tell me what you would do different. Jef

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aeris epic - incorrect depth and time in samples
by Chad Burt 06 May '12

06 May '12

I'm having some trouble using the "universal" sample with my Aeris Epic dive computer. After running, I get what appears to be correct information for each dive, except for the samples. The depth is always 11.41, and despite the fact that my sampling interval is set to 1 second I only get a sample for every two seconds: <sample> <time>00:04</time> <vendor type="5" size="8">5A0057025A005702</vendor> <temperature>24.44</temperature> <pressure tank="0">0.00</pressure> <depth>11.41</depth> </sample> <sample> <time>00:06</time> <vendor type="5" size="8">5A00570257005702</vendor> <temperature>24.44</temperature> <pressure tank="0">0.00</pressure> <depth>11.41</depth> </sample> I've compiled the samples on my machine and used the pre-built binaries with the same result. I've also used the plugin from diveboard.com to connect to my computer as well and had the same problem. MacDive imports them just fine though. Odd, since I understand both of these apps use libdivecomputer. I'd very much appreciate any help. I'm hoping to develop some software for analyzing this xml output as well as UDCF from the perspective of the freediver. I've got some ideas for organization and visualization that I think will be a lot more useful than the typical scuba-focused software provides. -Chad

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devel May 2012