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Steve Kemp: Writing your own e-books is useful

Wed, 08/10/2014 - 20:03

Before our recent trip to Poland I took the time to create my own e-book, containing the names/addresses of people to whom we wanted to send postcards.

Authoring ebooks is simple, and this was a useful use. (Ordinarily I'd have my contacts on my phone, but I deliberately left it at home ..)

I did mean to copy and paste some notes from wikipedia about transport, tourist destinations, etc, into a brief guide. But I forgot.

In other news the toy virtual machine I hacked together got a decent series of updates, allowing you to embed it and add your own custom opcode(s) easily. That was neat, and fell out naturely from the switch to using function-pointers for the opcode implementation.

Categories: LUG Community Blogs

Steve Kemp: Before I forget, a simple virtual machine

Sun, 05/10/2014 - 09:34

Before I forget I had meant to write about a toy virtual machine which I'ce been playing with.

It is register-based with ten registers, each of which can hold either a string or int, and there are enough instructions to make it fun to use.

I didn't go overboard and write a complete grammer, or a real compiler, but I did do enough that you can compile and execute obvious programs.

First compile from the source to the bytecodes:

$ ./compiler examples/loop.in

Mmm bytecodes are fun:

$ xxd ./examples/loop.raw 0000000: 3001 1943 6f75 6e74 696e 6720 6672 6f6d 0..Counting from 0000010: 2074 656e 2074 6f20 7a65 726f 3101 0101 ten to zero1... 0000020: 0a00 0102 0100 2201 0102 0201 1226 0030 ......"......&.0 0000030: 0104 446f 6e65 3101 00 ..Done1..

Now the compiled program can be executed:

$ ./simple-vm ./examples/loop.raw [stdout] register R01 = Counting from ten to zero [stdout] register R01 = 9 [Hex:0009] [stdout] register R01 = 8 [Hex:0008] [stdout] register R01 = 7 [Hex:0007] [stdout] register R01 = 6 [Hex:0006] [stdout] register R01 = 5 [Hex:0005] [stdout] register R01 = 4 [Hex:0004] [stdout] register R01 = 3 [Hex:0003] [stdout] register R01 = 2 [Hex:0002] [stdout] register R01 = 1 [Hex:0001] [stdout] register R01 = 0 [Hex:0000] [stdout] register R01 = Done

There could be more operations added, but I'm pleased with the general behaviour, and embedding is trivial. The only two things that make this even remotely interesting are:

  • Most toy virtual machines don't cope with labels and jumps. This does.
    • Even though it was a real pain to go patching up the offsets.
    • Having labels be callable before they're defined is pretty mandatory in practice.
  • Most toy virtual machines don't allow integers and strings to be stored in registers.
    • Now I've done that I'm not 100% sure its a good idea.

Anyway that concludes todays computer-fun.

Categories: LUG Community Blogs

Steve Kemp: Kraków was nice

Sat, 04/10/2014 - 13:20

We returned safely from Kraków, despite a somewhat turbulent flight home.

There were many pictures taken, but thus far I've only posted a random night-time shot. Perhaps more will appear in the future.

In other news I've just made a new release of the chronicle blog compiler, So 5.0.7 should shortly appear on CPAN.

The release contains a bunch of minor fixes, and some new facilities relating to templates.

It seems likely that in the future there will be the ability to create "static pages" along with the blog-entries, tag-clouds & etc. The suggestion was raised on the github issue tracker and as a proof of concept I hacked up a solution which works entirely via the chronicle plugin-system, proving that the new development work wasn't a waste of time - especially when combined with the significant speedups in the new codebase.

(ObRandom: Mailed the Debian package-mmaintainer to see if there was interest in changing. Also mailed a couple of people I know who are using the old code to see if they had comments on the new code, or had any compatibility issues. No replies from either, yet. *shrugs*)

Categories: LUG Community Blogs

Alan Pope: XDA Developer Conference 2014

Wed, 01/10/2014 - 11:09

The XDA Developer community had its second conference last weekend, this time in Manchester, UK. We were asked to sponsor the event and were happy to do so. I went along with Daniel Holbach from the Community Team and Ondrej Kubik from the Phone Delivery Team at Canonical.

This was my first non-Ubuntu conference for a while, so it was interesting for me to meet people from so many different projects. As well as us representing Ubuntu Phone, there were guys from the Jolla project showing off SailfishOS and their handset and ports. Asa Dotzler was also there to represent Mozilla & FirefoxOS.

Daniel did a small Ubuntu app development workshop which enabled us to learn a lot from our materials and process around App Dev Schools which we’ll feed back to later sessions. Ondrej gave a talk to a packed room about hardware bring-up and porting Ubuntu to other devices. It was well receieved and explained the platform nicely. I talked about the history of Ubuntu phone and what the future might hold.

There were other sponsor booths including big names like nVidia showing off the Sheild tablet and Sony demonstrating their rather bizarre Smart EyeGlass technology. Oppo and OnePlus had plenty of devices to lust after too including giant phones with beautiful displays. I enjoyed a bunch of the talks including MediaTek making a big announcement, and demonstrating their new LinkIT One platform.

The ~200 attendees were mostly pretty geeky guys whose ages ranged from 15 to 50. There were Android developers, ROM maintainers, hardware hackers and tech enthusiasts who all seemed very friendly and open to discuss all kinds of tech subjects at every opportunity.

One thing I’d not seen at other conferences which was big at XDA:DevCon was the hardware give-aways. The organisers had obtained a lot of tech from the sponsors to give away. This ranged from phone covers through bluetooth speakers, mobile printers, hardware hacking kits through to phones, smart watches & tablets, including an Oppo Find 7, pebble watch and nVidia Sheild & controller. These were often handed out as a ‘reward’ for attendees asking good questions, or as (free) raffle prizes. It certainly kept everyone on their toes and happy! I was delighted to see an Ubuntu community member get the Oppo Find 7 I was rewarded with an Anker MP141 Portable Bluetooth Speaker during one talk for some reason

On the whole I found the conference to be an incredibly friendly, well organised event. There was plenty of food and drink at break times and coffee and snacks in between with relaxing beers in the evening. A great conference which I’d certainly go to again.

Categories: LUG Community Blogs

Steve Kemp: Next week I shall be mostly in Kraków

Fri, 26/09/2014 - 18:20

Next week my wife and I shall be mostly visiting Poland, and spending a week in Kraków.

It has been a while since I've had a non-Helsinki-based holiday, so I'm looking forward to the trip.

In other news I've been rationalising DNS entries and domain names recently, all being well this zone should be served by Amazon shortly, subject to the usual combination of TTLs and resolution-puns.

Categories: LUG Community Blogs