lgeek

18 ms·

121.
by lgeek 12y ago
I like Deviation[0]. It runs on commercial transmitters and the developer reverse engineered many communication protocols used by proprietary systems which are now supported (some require adding hardware to your transmitter). [0] http:&#x2
122.
by lgeek 12y ago
Most RC transmitters are digital and use the 2.4 GHz spectrum. They do channel hopping, they do integrity checking (CRCs for the most part), have configurable channels and mixing. Some also do telemetry and support multiple profiles for the
123.
by lgeek 12y ago
I've experienced plenty of similar bugs that don't manifest when running under a debugger while working on modern ARM systems (not that any of it is necessarily specific to ARM, it's just what I work on). Usually it's on
124.
by lgeek 13y ago
That's with PAE, you're still limited to 4GB of virtual address space, or rather 3GB with the default Linux configuration.
125.
by lgeek 13y ago
It seems they don't have any rules against panelization. I wonder if they'll accept panelized designs with slots and mouse bites.
126.
by lgeek 13y ago
> It's by the people at Dangerous Prototypes Source? I can't find any mention on their website.
127.
by lgeek 13y ago
The regular price is $65. http://www.hardkernel.com/main/products/prdt_info.php?g_code...
128.
by lgeek 13y ago
> You reflow the whole board with a hot air station? I've been using an oven. How big a board can you do that way? Yep. It's not really by choice, but because I have limited space. That being said, I like being able to watch th
129.
by lgeek 13y ago
> QFNs and most reflows are tricky as well I've now manually soldered two dozen or so 0.5mm pitch QFN chips without a single failure. To be honest, I'm somewhat surprised myself. I'm using the footprint recommended by the
130.
by lgeek 13y ago
> We should instead supplement our sturdy but silent black boxes with a chattier partner. The new device would not survive a catastrophic breakup. Nor would it receive the omniscient breadth of data trusted to a black box. Instead, it wo
131.
by lgeek 13y ago
Note that as far as I know MCUs from that series don't have an ADC, which can be a real PITA. Personally, I've switched to using MCUs in QFP packages a while ago. You get a lot more pins, peripherals, speed, etc for the physical d
132.
by lgeek 13y ago
> ARM dudes came up with Thumb-2 I guess I'm nitpicking, but Cortex-M0+ and Cortex-M0 are basically Thumb only. The only Thumb-2 instructions implemented by these cores are the ones for barriers and transferring data between general
133.
by lgeek 13y ago
> registration before ordering is compulsory It's mostly a B2B company, I think it's natural their website won't be optimised for other types of users. You can still add items to the basket and see total charges without be
134.
by lgeek 13y ago
Except that americium dioxide is insoluble[0], so it wouldn't dissolve in the water supply. Even if consumed, it would pass straight through your digestive system and wouldn't accumulate in the body. [0] http://media.cn
135.
by lgeek 13y ago
A smoke detector contains about 0.25 μg of americium [0], which is painted on the inside of a chamber. In small quantities, it seems americium dioxide can only be dangerous if inhaled [0]. According to David Hahn's Wikipedia page[1],
136.
Jamie Hyneman: "Innovation, Explosions, and the Benefit of Adolescent Behavior"(youtube.com)
1 points by lgeek 13y ago|0 comments
137.
by lgeek 13y ago
I'm all for supporting small business that create hardware, especially open source (heck, I'm working on some stuff myself), but they must make an effort to make their products affordable. I can buy a 3.2" touchscreen LCD for
138.
by lgeek 13y ago
Well, you'll find the glorious smartphone screens are sold as replacement screens for smartphones. But of course, smartphones tend to have an LCD controller on the SoC, so you just get a raw LCD parallel interface. That means the LCD h
139.
by lgeek 13y ago
I don't see the concept of DMA as unsafe. I'm not that familiar with x86, but it seems that random devices can set up DMA transfers. Why? I guess there were performance considerations, but in that case an IOMMU needs to be used. O
140.
by lgeek 13y ago
You don't really need a bank account to rent a home. In fact, at my first place I've only paid rent with cash or by debit card for almost one year, and it was an agency. Private landlords tend to be even more flexible, basically t
141.
by lgeek 13y ago
Yep, two other more 'deterministic' strategies should have caught this: interactive debugging should have showed that the memory is set to zero immediately after loading, not while running; and inspecting the symbol table could ha
142.
by lgeek 13y ago
> Besides, the screenshots from VS's mixed source/asm debugging do look nice and are really clear and helpfu for beginners. gdb can print the same sort of thing using disas/m. Here's an example: http://i.im
143.
by lgeek 13y ago
> CISC has won (heck, even ARM is not RISC anymore). Deal with it :) If by RISC you literally mean a reduced number of instructions, I guess that's a valid point. But RISC is mostly used to describe instruction sets in which each in
144.
by lgeek 13y ago
I'll bite the bullet: Funnily enough, I think this sort of design fails to account for Moore's law (different Moore, you see). The principle here is to drop many of the principles that make modern processors fast: pipelines, cache
145.
by lgeek 13y ago
You're right about this. Dynamic analysis instance is only useful if the application goes on to the relevant execution path, and static analysis is made quite difficult by dynamic generation and a few other tricks. However, if hidden b
146.
by lgeek 13y ago
> You run their software in binary form, having no idea what it does. You have no way to verify whether what they say is true. Sorry, but it's a bit tiring seeing this blanket statement. You can absolutely verify what closed source
147.
by lgeek 13y ago
And then there's also TrustZone[0] so don't be surprised if there's an additional hypervisor or RTOS running on the main application processor. [0] http://www.arm.com/products/processors/technologies
148.
by lgeek 13y ago
According to this article[0], the data from old floppy disks is pretty much gone. [0] http://ascii.textfiles.com/archives/3191
149.
by lgeek 13y ago
When a battery might have been damaged, it's dangerous to discharge it, so I never see this becoming a standard procedure for handling EV crashes. A solution that might be more practical: individual Li-Ion cells are only 3.7-4.2V, so i
150.
by lgeek 13y ago
As a continental who has moved to the UK, I have to agree. BS1363 seems to be the best design: * it's mechanically sound, as opposed to Europlug which tends to wiggle and Schuko which is sometimes difficult to plug and especially unplu

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