LabNotes for This Project
18 Mar 2025
Today in the lab, we’re doing some celebrating. I set myself a goal back around the turn of winter that PETI version 0.5.0 would release before Spring had Sprung. And now, with just about a full day to spare, I am announcing that release on time. This marks the fisrt time that a PETI release has been even close to its original promised timeframe and also was quite possibly the most straightforward update I’ve cut. Most of what we wanted to add is basically just new animation, and thanks to the last several refactors of the display code, adding new animation is just straightforward string manipulation now.
12 Feb 2025
For the last few weeks, particular during our scheduled lab livestreams, I’ve been working on the 0.5.0 firmware update for PETI, our house-developed virtual pet. While the main focus of the update is going to be the Bathing and Bathroom gameplay features, the update also includes some window-dressing changes and an important change to support the Revision D development kit, which should be coming out sometime this spring. This last bit is the piece we’ve just implemented: the use of Pulse-Width Modulation to drive an audio signal on the pet.
13 Jan 2025
As is the running tradition around here, I can open this post by hooping my thumbs through my suspenders and saying “Boy, it sure has been a while since we had a PETI update, huh?”. For a project that’s been running for multiple years now, the progress certainly seems slow when you view it on the aggregate timeline. That’s why I have good news: the next firmware update is coming soon!
02 Jun 2024
Only half a year or so behind the original projected release date, I am absolutely thrilled to announce the release of version 0.4.0 of the firmware for PETI, which has been tested and validated against the very same Revision B/C development kits that sold out back in February. 0.4.0 is being billed as The Sleep and Growth update because of the features it comes packing, and also includes all the fixes needed for a few bugs introduced in 0.3.0, which was released last fall.
27 Feb 2024
It’s not just you - for the last several months I’ve been talking about pretty much exclusively the 0.4.0 firmware update for PETI, and with such a close eye on that (admittedly large) prize, it can be hard to see where the rest of the project is going. That’s why, for this week’s blog post, I want to take a step back, and look at the current roadmap for updates that should lead us more or less all the way up to the 1.0 firmware update - the “release” version.
06 Feb 2024
Just last time, I talked about how I’ve been working on making some changes to how fonts are handled in PETI; specifically, switching to a more standard font “source” format that would allow more choice on the developer end, insofar as what tools would be usable for editing the fotns. We chiefly did this by creating a FontX2-format exporter for the older fontedit editor, since fontx2 is a relatively simple bitmap font format used by lots of other embedded devlopers, and usable for quite a few different font editors. The simplicity of the format gave me a pretty clear idea for how to get the fonts included directly into PETI’s source code, which itself gave me some ideas for working toward one of the loftier end-goals of the project.
24 Jan 2024
When it comes to PETI firmware updates, it’s a small secret that they rarely come out according to plan. The next firmware update, 0.4.0, is no exception - dedicated readers will remember that I had originally promised that release by Christmas, on the heels of a mid-autumn release of the current version, 0.3.0. The update was supposed to support the ability for the pet to sleep and for the implementation of the game’s native evolution system, so it should come as no small shock to anyone that in actual fact its being blocked by - font development. If that doesn’t seem to make sense to you, jump below the cut and we’ll have a look at what’s going on here.
03 Dec 2023
Our major project, PETI, was supposed to recieve a major firmware update “around christmastime” that was going to add in two new major features: the ability for the pet to sleep (including a battery-saving mode to shut off the screen after a while while it’s sleeping) and the ability for the pet to evolve from one form to another. I started creating that update two months ago, back around mid-october, hot on the heals of the 0.3.0 firmware update, and I’m bundling in a large number of bugfixes to go with it, such as issues that were silently introduced with the previous firmware updates that had to do with handling higher-address fonts and stuff like that. The release of 0.4.0 was going to be a major feather in my cap, done on time - it would have marked the first time since the start of the project I’d actually managed a quarterly feature update, and sleep and evolution were the last two major features that were considered part of the magic version 1.0 milestone set; everything else after this is window dressing, tweaks, and refinements, with the only major feature to release after this being the expansion header standards, which are a stretch goal onto the project anyway.
04 Oct 2023
A few weeks ago, I published the PETI 0.3.0 firmware update! This update included mostly power management changes and display driver fixes. Here’s a quick look at how to get it, what it does, and what’s coming next in 0.4.0, which I’m hoping to get out later this year.
08 Sep 2023
I set an incredibly light and easy goal for myself going into the first month or two of fall 2023: fix the power management problem that is reducing battery life to about 10% of what my back-of-the-napkin math had me expecting it to be. The culpret seemed immediately obvious: clearly, we are writing to the display too often.
18 Aug 2023
This announcement here, on my own site, is actually a couple weeks late, but I finally got around to finishing the service manuals for the PETI development kit and making the development kits available on Tindie as DIY assembly kits! In part due to the through-hole design making assembly easy (though a tad prohibitively time-expensive when doing large numbers of them) and TI’s licensing around what I can and cannot do with the development hardware they themselves designed that make up part of the kit, I decided to opt for the route of selling the Development Kits as Do It Yourself kits consising of the PCBs for the Controller Board and the Rear Expansion Board.
23 May 2023
Today we’ll talk about something changing around the lab, dive fairly deep in to the state of our currently-flagship project, PETI, and drill down into some side projects for the back half of the year. We start in with bad news and then it just gets better and better as you go, so tear the proverbial bandage off under the cut.
29 Nov 2022
Last week in our quarterly update post I mentioned implementing a Mersenne Twister for PETI. This was a bald-faced lie, made possible by not consulting my notes. A Mersenne Twister would have been much more effective than the Linear Congruential Generator I implemented instead. I want to talk about how we got there, as well as what is wrong with it.
15 Mar 2022
One of the great truisms of making things (the precise definitions of ‘making’ and ‘things’ being surprisingly flexible) is that there’s always room for a nice side project, and since the last update on PETI, that’s exactly what I’ve been working on. A short time ago I acquired a Saleae Logic 8 USB Logic Analyzer, and while it’s sort of pushing the envelope of what a logic analyzer is used for, I decided to take the opportunity to stretch its functionality into a sorely needed utility - video capture for PETI’s main display over USB.
03 Mar 2022
Was there a firmware update to PETI? I must have done a refactor of the Display driver code. It’s sort of a tradition at this point, but to be fair it’s not the totality of the 0.1.0 firmware update. Let’s see what’s new.
11 Feb 2022
It’s not necessarily what you’d expect me to be working on in the weeks immediately following getting my hands on the prototypes of the rear expansion board, but it turns out that implementing at least a proof-of-concept version of the alert drivers took about four hours, and I’m ready to move on to something that was done wrong the last time it was implemented; the display refactor. Click through to the full article for some details.
16 Jan 2022
Members of the #PETI channel on the Arcana Labs Discord Server may have already known this, but late last year I developed a plan to sell a small number of PETI Development Kits early. The plan was to have my prototype of the Rear Expansion Board milled, then either assemble or package them as kits together with the necessary components, TI Launchpad for MSP430FR5994, and other accessory boards. The idea was that if I sold the small number of extras I would have from that particular PCBWay order, it would help defray costs going into the last little streth of development.
30 Dec 2021
The categorization features of the site sort of discourage it, but I thought I might go ahead and put together a sort of year-end megapost and just recap everything. Everything. Because why not? Jump through the cut and we’ll take a stroll down past and future a bit here.
01 Dec 2021
What’s it been, the better part of a month? Three weeks? Time flies. A lot has happened around the lab in those three weeks: PETI got a new version, I broke some stuff, and I fixed some stuff. Hop in to see the full update.
10 Nov 2021
Considering I called this punch during the previous update, it should come as no real surprise to anyone that the most recent release of PETI code, v 0.0.5, is mostly about menus. Indeed, you could even go so far as to call it as the Menu Update. In this update, we’ve added the custom menu that displays the pet’s current status, as well as the all-important text menu generator, which will let us avoid making too many more special-purpose menus.
31 Oct 2021
Last Time Around, we talked a little bit about the hardware backplane and audio. Spoiler alert: that is now a solved problem. While PETI itself doesn’t use it, I’ve proofed the timing circuit and I’ll be ordering those boards eventually, which will be a good time to talk about that a bit more and implement it into the PETI software itself. Instead, I’ve been putting work into solving a problem with the main menu screen: drawing the icon-based main game menu, released as PETI firmware v 0.0.4.
14 Sep 2021
As you probably recall from the previous update, the last little push for the PETI development kit is the “back board”, an extra expansion on the existing dev kit that will add key functionality like the battery pack to the device. One such feature is the ability to do auditory alters via a small speaker. In the true spirit of known and unknown unknowns, I went 100% Dunning-Kreuger and decided that this would be relatively trivial, and since it was the part of the back circuit I understood the least, it would be the first part of the board I would proof the concept of.
27 Aug 2021
Wasn’t there an update for Tapestry coming out this month? Weren’t you going to keep working on PETI? Did anything get done at the labs, come to think of it? Actually, yeah. Lots of things have happened. Let’s talk about those.
27 Jul 2021
Circumstance and mood have conspired to make this, the final week of July, on of two periods of paid leave from work which I’ll be able to take this summer. As a result, I spent monday night and a good chunk of yesterday updating and recompiling PETI’s firmware. Last night I published this firmware update’s source [here (permalink)] as the 0.0.3 release. This version adds a new demo functionality, replacing the old demo with a menu which allows you to cycle through the various forms PETI can take, and view all four of their currently-supported animations: idle, face right, face left, and eating. I’ll go back through and add support for the sleeping animation at around the same time I add sleeping into the game.
11 Jun 2021
PETI has a text-based interface; I think I’ve said that enough times by now for everyone to have it burned into their brain, but in case I haven’t - almost everything PETI can display on its screen is functionally text, in that it is comprised of cells of a given size (8 by 8, 8 by 12, or 16 by 16 pixels), and the display library treats each row of such cells as a string of text, referencing a font to determine which pixels to turn on or off depending on the size needed. This places some constraints and labouriousness on managing the display which I want to talk about today, because it’s what I’ve been working on.
13 May 2021
While calling it an operating system is overstating the complexity involved dramatically, the fact remains that I have had a very productive week in that the two most convoluted portions of the PETI firmware is now in place - the two systems which manage the central game state object and decide what is drawn on the screen and when. Step on through and we’ll talk about how that was done, and the pitfalls I found along the way.
04 May 2021
24 hours ago, I was absolutely certain I had attained a dubious electrical engineering right of passage, and blown up my first development board. I was certain of this because I had tested it extensively. Twelve hours ago, I learned I was wrong.
22 Apr 2021
It’s been a while since I’ve done an update on PETI, the implemented-in-hardware virtual pet I’ve been designing, and that’s true for a very good reason: I’ve taken and killed it, stone dead.
24 Dec 2020
Just a few moments ago, I finally set (the PETI and PETI-Helpers repos)[https://github.com/zadammac/peti] public! This update has been a long time coming, but it’s also not the end of this project. In a way, it’s merely the beginning.
25 Nov 2020
Two weeks? More or less. We’re on company time, after all.
02 Oct 2020
Last time we talked about PETI, I spent a few hundred words bloviating over getting trapped in a state of not having an ISR to handle an Interrupt that I couldn’t resolve because it didn’t occur during debugging, and thus couldn’t be identified. To be honest, I still haven’t identified the relevant interrupt. What I did do, though, was heavily troubleshoot my SPI_WriteLine function, resolving whatever issue was raising the interrupt in the process, so close enough.
15 Sep 2020
Over the last two weeks (read: about half a dozen lab hours) I’ve manage to break my stalemate on PETI. For those keeping track, I have been fiendishly attempting to not have to engineer a display driver by instead porting a display driver so badly that I’ve rewritten much of its functionality essentially from scratch.
05 Jul 2020
Several friends of the Lab have suggested I blog more about all the various projects I’m working on at KSL, whether those projects are ready for release or not. This is actually sort of a return to the origin of the blog - if you dive into the archives you’ll find plenty of notes on projects that never quite got of the ground - like Tarnished Tale.
