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#1 |
Junior Member
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Join Date: Jun 2019
Location: Budapest, Hungary
Device: Hanlin V3+
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Hanlin v3+ application development
Sorry for jumping in medias res with my first post, but here we go: I've tried pretty much everything else and could not find any help with my problem, which is the following: I'd like to develop native applications (or maybe just one) for the Hanlin v3+, but I do not have the necessary toolchain and SDK. I'm sorry if this is not the right subforum to ask, but I could not figure out a better place for it.
I am aiming at porting a Xiang Qi (a Chinese relative of our chess)-playing application to the ebook reader, as a way to salvage what use remains in the device, now that I use an iPad for reading books. I have found the earliest version of the v3 toolchain and SDK on the Internet a couple of years ago, and although I managed to get it to work and compile Leo's SDK, the resulting binary is simply causing the device to hang, and it can only be restarted after a reset. Seems like the v3 and the v3+ aren't even ABI-compatible. No other versions of the kit appear to be present anywhere on the Internet. I have also contacted the local distributor, who empathized with my problem but could not help. They proposed that I ask people on mobile reader forums, which I'm doing right now. The v3+ and perhaps the v3 also have a somewhat limited and utterly undocumented Java virtual machine, which I have investigated deeply enough to have ported a limited version of the program to it. But this VM seems to have a very low size limitation on I don't even know what, perhaps memory left available to code + data after the JVM takes up residence in memory; anyway, it will crash with an out-of-memory entry in the log unless I pack all my data into bytes instead of ints. I plan to complete the port to Java - only the interaction part is missing -, but odds are it won't fit into memory and even if it will, it will run very slowly - thinks for almost a minute on a 4-ply search and although I don't expect to need more depth any time soon, this still seems like too slow, interfering with the joy of the game and depleting the battery like there's no tomorrow. (I have just outfitted the device with a new battery - some counterfeit Nokia, by the sound of it - but I doubt I will be able to do so again in a few years if this battery gets run down due to excessively frequent charging cycles.) So, bottom line, can someone point me to a toolchain and an SDK (including documentation) suitable for the V3+? Many thanks in advance. |
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#2 |
The Grand Mouse 高貴的老鼠
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Location: Norfolk, England
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You're certainly asking this in the right place. I hope someone can help you. Have you tried asking the manufacturer directly?
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#3 | ||
Junior Member
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Join Date: Jun 2019
Location: Budapest, Hungary
Device: Hanlin V3+
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#4 |
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Location: Chennai
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i found some stuff under this link; Maybe could be of help.
https://4pda.ru/forum/index.php?show...ost&p=76948761 |
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#5 | |
Junior Member
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Location: Budapest, Hungary
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#6 |
Junior Member
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While waiting for a miracle here I have finished implementing the game in Java, and it does run - for a low enough value of 'running' - on the ebook reader. I'd need some proper words to describe its performance, but for now we can probably settle on "abysmal". 2-ply search + extending the horizon by one ply at each check, plus a quiescence search along captures + repetition check using Zobrist hashes = sometimes three-four minutes worth of thinking. I'm sure I could tune the algorithm somewhat - e.g. the efficiency of the alpha-beta cutoff depends on a preliminary sorting and I am not at all sure I'm doing it correctly. For now, given how a weak player I am and how I'll use this game mostly amid distractions provided by public transport, I think I'll simply cut back on depths - no horizon expansion, a ten-ply limit even for quiescence search etc. We should be evenly matched, then.
I kept postponing this particular experiment for four years because when I last tried it I kept running into spurious Out of memory errors with it, and the errors seemed to be linked to the amount of static data I had. But it turns out the problem is with JVM initialization, not class loading. Specifically, I need two-three megabytes at most, but since I kept getting the OOM erros, I was trying to set the heap size as high as possible, which is 64 M. Turns out the problem is this heap size - if I set it to 32 M, which is still more than I need, the OOM errors go away. All this is rather unsatisfactory, so I still hope someone can direct me to the proper SDK. I was told nothing ever disappears from the Internet once it makes it there, but I seem to have stumbled upon a counterexample. |
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#7 |
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i have been plodding through the wayback machine.
one interesting link i found relating to v3+: https://web.archive.org/web/20150923...r=asc&start=20 According to this, v3+ sdk seems same a a v5 sdk. A suggestion is, try to contact Buggins. He may be able to help. (github, sourceforge etc.,) https://github.com/buggins Failing which, another suggestion is to create your own toolchain: something like this, it deals with the exact same processor of the v3+. https://www.sachinsharma.com/2010/12...hain_7883.html (might be a real long shot this one) On other thoughts: why try to develop for such an ancient device? something like a BQ Cervantes, would be far more easier. It is supposedly open source and sourcecode etc., all available in github. |
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#8 | |||
Junior Member
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I might have to contact the person in question. I have come across the claim that "v3+ resembles v5 more than v3" but I never thought that the SDK might be not just similar but identical. Quote:
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On a positive note, the Java version seems to be working better now. I have figured out that quiescence search benefits from alpha-beta pruning too (yeah, sarcasm - I removed the supporting code in a bid to reduce code size, and when it turned out this was not a problem I forgot to re-enable it), and that the way I implemented alpha-beta, contrary to what I said earlier, is doing a very good job cutting down execution time - the long waits were due to quiescence search being done in a full minimax fashion, and basic search would have exploded similarly if not for alpha-beta. (On the flip side this also means the Java VM is even slower than I originally thought.) Now the program replies in a few seconds, rarely reaching 5s, and it also seems to play reasonably well (time to time it beats Zillions of Games with decent search depth settings - it's kind of a rock-paper-scissors situation, as I can beat the reader, the reader can beat Zillions and Zillions can beat me; sounds like our weaknesses line up in a funny way). So if all else fails, I'll stay with this implementation at least until I learn its quirks and weaknesses to the point that I cannot fix them but get bored with beating it due to knowing them. |
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#9 |
Enthusiast
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Join Date: Feb 2009
Location: Denmark
Device: LBook (Hanlin v.3), iPad1+3, GloHD 32GB, ClaraHD 8GB, iPadPro2 512GB
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I still have one of these - the L-book - and maybe also some software/firmware from those days too (if any interest).
It still holds a charge, but unfortunately the #2 button does not work anymore, and I have not had the energy to seek out a solution. |
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