Discussion:
[Arm-netbook] riki200 v3 first print: success
Luke Kenneth Casson Leighton
2017-09-10 01:51:13 UTC
Permalink
http://forums.reprap.org/read.php?177,767087,787441#msg-787441

yay!

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Christopher Havel
2017-09-18 05:22:10 UTC
Permalink
Hey, Luke, this might be useful to you... (I *think* I have the right
thread here... lol...)

https://hackaday.com/2017/09/17/better-stepping-with-8-bit-micros/
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Luke Kenneth Casson Leighton
2017-09-18 06:07:04 UTC
Permalink
On Mon, Sep 18, 2017 at 6:22 AM, Christopher Havel
Post by Christopher Havel
Hey, Luke, this might be useful to you... (I *think* I have the right
thread here... lol...)
https://hackaday.com/2017/09/17/better-stepping-with-8-bit-micros/
they're using DMA - which is really what you're supposed to be doing anyway.

the entire arduino software ecosystem was never designed to actually
give people proper access to the hardware. anything that's a 180mb
download and requires a 200mb runtime environment to compile and
upload an executable that's only 16k in size *really* isn't going to
end well.

so they're stepping well outside of the "normal" boundaries - good
luck to them.

personally i feel it's much better to use a faster 32-bit processor,
and to stick reaaasonably within an eco-system. however....
RepRapFirmware is just... genuinely much better-designed than Marlin.
it's written in c++, it takes full advantage of OO techniques (Marlin
does not. at all). it's also event-driven which means that the
highest priority - based on a timer - is the actual stepper moving,
with other "tasks" running to handle keeping the queue full... lots
more as well.

also as it's timer-based and event-driven it's *automatically* far
superior to what Marlin does. if you wanted to use DMA (if it isn't
already) it would be far easier to use that in RepRapFirmware than
Marlin. Marlin is a hard-coded for-loop with an interrupt for
handling moves, but it's bit-banged (!) and... yeah.

anyway. back to PCB work...


l.

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Elena ``of Valhalla''
2017-09-18 09:15:02 UTC
Permalink
Post by Luke Kenneth Casson Leighton
the entire arduino software ecosystem was never designed to actually
give people proper access to the hardware. anything that's a 180mb
download and requires a 200mb runtime environment to compile and
upload an executable that's only 16k in size *really* isn't going to
end well.
Well, IIRC they do bundle gcc(-avr), which tends to be quite big, but
doesn't really need to be downloaded again if you already have it from
your distribution, and the runtime environment is only needed if you
want to use their IDE instead of your favourite editor + a Makefile (and
there is (was?) at least one example Makefile somewhere in the arduino
package).

Looking at the installed sizes on debian (which has an older version for
license reasons) I see that the libraries are about 6½MB and the IDE
itself is just 1½MB.

https://packages.debian.org/sid/arduino-core
https://packages.debian.org/sid/arduino

To really reduce size they would have to drop gcc, but I don't think
that would be a reasonable choice for just the aim of side reduction.

Other than assuming that beginners will be fine with just their IDE (and
targeting their documentation at them), I don't think they ever did
anything to prevent people from going deeper on their own, as they
learned more, including using the arduino board as an AVR devboard
completely ignoring the arduino software.
Post by Luke Kenneth Casson Leighton
so they're stepping well outside of the "normal" boundaries - good
luck to them.
Fully agree here: what they are doing lately makes them at the very
least quite irrelevant to the Open Hardware world.
--
Elena ``of Valhalla''

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Luke Kenneth Casson Leighton
2017-09-18 10:33:42 UTC
Permalink
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Mon, Sep 18, 2017 at 10:15 AM, Elena ``of Valhalla''
Post by Elena ``of Valhalla''
Post by Luke Kenneth Casson Leighton
the entire arduino software ecosystem was never designed to actually
give people proper access to the hardware. anything that's a 180mb
download and requires a 200mb runtime environment to compile and
upload an executable that's only 16k in size *really* isn't going to
end well.
Well, IIRC they do bundle gcc(-avr), which tends to be quite big, but
doesn't really need to be downloaded again if you already have it from
your distribution, and the runtime environment is only needed if you
want to use their IDE instead of your favourite editor + a Makefile (and
there is (was?) at least one example Makefile somewhere in the arduino
package).
yehyeh... it wasn't always like that.
Post by Elena ``of Valhalla''
Looking at the installed sizes on debian (which has an older version for
license reasons) I see that the libraries are about 6½MB and the IDE
itself is just 1½MB.
phil was instrumental in arranging that.
Post by Elena ``of Valhalla''
https://packages.debian.org/sid/arduino-core
https://packages.debian.org/sid/arduino
yep he recommended to the arduino package maintainer that the actual
core parts not be glommed together with a runtime and IDE and
everything else.

then there's avr-utils, a few other things, the libraries as well:
you can now basically mix and match and use editors and minimal build
dependencies... but seriously that's *not* the way it's normally done
[by beginners]
Post by Elena ``of Valhalla''
To really reduce size they would have to drop gcc, but I don't think
that would be a reasonable choice for just the aim of side reduction.
yehyeh.
Post by Elena ``of Valhalla''
Other than assuming that beginners will be fine with just their IDE (and
targeting their documentation at them), I don't think they ever did
anything to prevent people from going deeper on their own, as they
learned more, including using the arduino board as an AVR devboard
completely ignoring the arduino software.
yeah if you've ever heard of the OSMC (Open Source Motor Controller)
that uses a PIC, i bought one back in... 2003 or so. 1,000 lines of
c, using not even gcc. no libraries, nothing.

.... when i first heard about arduino i was really shocked at how
much the dev environment was.
Post by Elena ``of Valhalla''
Post by Luke Kenneth Casson Leighton
so they're stepping well outside of the "normal" boundaries - good
luck to them.
Fully agree here: what they are doing lately makes them at the very
least quite irrelevant to the Open Hardware world.
ho hum :) i really wanted to use RADDS because the Duet 0.8.5 and
the Duet-NG are almost as much as an entire 3D printer can be sourced
for here... only to find that the damn thing's non-free! they're
happy to provide a non-commercial license...

... it was the last straw. i spent the weekend making an improved
version of RAMPS 1.4 - called RD3D (yes after R2D2...) and it's been
sent for first PCB manufacturing, already, this morning. yes i rushed
it, yes i realised i'm using only a 500mA regulator which means it
might be current-limited: i'll just have to drop a different LDO in
place using some wires.

http://reprap.org/wiki/RD3D/1.0

but guess what? it's GPLv3 and it's *properly open*. and awesome.
6 steppers (RAMPS has 5) and 4 MOSFETs (RAMPS has 3) and an on-board
MicroSD card and and and.

it was a very... busy... weekend :)

l.

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Philip Hands
2017-09-20 08:12:34 UTC
Permalink
Post by Luke Kenneth Casson Leighton
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Mon, Sep 18, 2017 at 10:15 AM, Elena ``of Valhalla''
Post by Elena ``of Valhalla''
Post by Luke Kenneth Casson Leighton
the entire arduino software ecosystem was never designed to actually
give people proper access to the hardware. anything that's a 180mb
download and requires a 200mb runtime environment to compile and
upload an executable that's only 16k in size *really* isn't going to
end well.
Well, IIRC they do bundle gcc(-avr), which tends to be quite big, but
doesn't really need to be downloaded again if you already have it from
your distribution, and the runtime environment is only needed if you
want to use their IDE instead of your favourite editor + a Makefile (and
there is (was?) at least one example Makefile somewhere in the arduino
package).
yehyeh... it wasn't always like that.
Post by Elena ``of Valhalla''
Looking at the installed sizes on debian (which has an older version for
license reasons) I see that the libraries are about 6½MB and the IDE
itself is just 1½MB.
phil was instrumental in arranging that.
Post by Elena ``of Valhalla''
https://packages.debian.org/sid/arduino-core
https://packages.debian.org/sid/arduino
yep he recommended to the arduino package maintainer that the actual
core parts not be glommed together with a runtime and IDE and
everything else.
Well, I reacted badly to the Java UI (because it was ludicrously broken
under tiling window managers -- the menu required you to click the
screen elsewhere to get anywhere, and my screen wasn't wide enough to
click anything on the sub-menus ;-) ), and noticed that it was actually
possible to use a Makefile, and that there were several Makefiles in
circulation, so chose what looked to be the most maintained one, and
suggested that the author pick up the nice features in the other ones,
and then stuck that together as the arduino-core package.

Then we worked out how to make the arduino package play nicely with
that, in order to remove the duplication, so ironically I'm now an
uploader on both, including the Java bits, despite the fact that my only
motivation at the start was driven by my aversion to Java.

As it happens, I fired up my arduino for the first time since doing the
arduino-core uploads last week -- My 5 year old daughter and I are
knocking up something to drive some LEDs and a motor in order to make
her IKEA kitchen have a working turntable in the microwave, and a blue
LED to simulate water coming out of the tap, etc.

I was actually using the IDE for that (which now works with Xmonad) just
for expediency, but this reminds me that I should use it as an excuse to
make sure that arduino-core still works.
Post by Luke Kenneth Casson Leighton
http://reprap.org/wiki/RD3D/1.0
Cool :-)

BTW you called it 'R3D3' in the penultimate paragraph.

Cheers, Phil.
--
|)| Philip Hands [+44 (0)20 8530 9560] HANDS.COM Ltd.
|-| http://www.hands.com/ http://ftp.uk.debian.org/
|(| Hugo-Klemm-Strasse 34, 21075 Hamburg, GERMANY
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Luke Kenneth Casson Leighton
2017-09-20 08:26:41 UTC
Permalink
Post by Philip Hands
Post by Luke Kenneth Casson Leighton
yep he recommended to the arduino package maintainer that the actual
core parts not be glommed together with a runtime and IDE and
everything else.
Well, I reacted badly to the Java UI (because it was ludicrously broken
under tiling window managers --
ohh that's right. you use xmonad. written in 1200 lines of haskell
if i recall. fricking awesome and scary at the same time :)
Post by Philip Hands
the menu required you to click the
screen elsewhere to get anywhere, and my screen wasn't wide enough to
click anything on the sub-menus ;-) ), and noticed that it was actually
possible to use a Makefile, and that there were several Makefiles in
circulation, so chose what looked to be the most maintained one, and
suggested that the author pick up the nice features in the other ones,
and then stuck that together as the arduino-core package.
cool!

yyyeah... have you noticed btw that the way they do "finding of
libraries" is... to indiscriminately extend make's "VPATH". all and
any headers, object files, modules, executables... *all* of those are
searched for in *every single one* of the paths.

if you happen to have the same filename somewhere anywhere in those
paths, you're hosed.

it's a total global namespace .... nightmare. nnnngh! whyyyy do
they doo thiiiiis!
Post by Philip Hands
As it happens, I fired up my arduino for the first time since doing the
arduino-core uploads last week -- My 5 year old daughter and I are
knocking up something to drive some LEDs and a motor in order to make
her IKEA kitchen have a working turntable in the microwave, and a blue
LED to simulate water coming out of the tap, etc.
ha, cool! yeah i bought something called a "Sparki" robot for me and
lilyana to play with. which was for about... 2 days. the GUI on that
however i have to say is extremely cool. it's block-based like a
jigsaw, and it auto-generates actual code which you can then look at
to see if it does what you expected.
Post by Philip Hands
Post by Luke Kenneth Casson Leighton
http://reprap.org/wiki/RD3D/1.0
Cool :-)
yeah. just added a 4th MOSFET (2 fans, 1 extruder, 1 heater or 2
extruders, 1 fan, 1 heater), an I2C EEPROM, and whoops added in a 4th
endstop (X, Y, Z, Z-probe - Z-probe veeery important if you want to do
auto-bed-levelling... *sigh*...)

but i have to say, it is completely insane that i've been driven to
design and have manufactured my own 3D printing PCB.

so i had to add that last section in order to explain it - mostly
it's for the crowd-funding people who might be going, "wtf???"
Post by Philip Hands
BTW you called it 'R3D3' in the penultimate paragraph.
ah good call, thx phil.

l.

l.

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Philip Hands
2017-09-20 15:29:09 UTC
Permalink
Post by Luke Kenneth Casson Leighton
Post by Philip Hands
Post by Luke Kenneth Casson Leighton
yep he recommended to the arduino package maintainer that the actual
core parts not be glommed together with a runtime and IDE and
everything else.
Well, I reacted badly to the Java UI (because it was ludicrously broken
under tiling window managers --
ohh that's right. you use xmonad. written in 1200 lines of haskell
if i recall. fricking awesome and scary at the same time :)
Post by Philip Hands
the menu required you to click the
screen elsewhere to get anywhere, and my screen wasn't wide enough to
click anything on the sub-menus ;-) ), and noticed that it was actually
possible to use a Makefile, and that there were several Makefiles in
circulation, so chose what looked to be the most maintained one, and
suggested that the author pick up the nice features in the other ones,
and then stuck that together as the arduino-core package.
cool!
yyyeah... have you noticed btw that the way they do "finding of
libraries" is... to indiscriminately extend make's "VPATH". all and
any headers, object files, modules, executables... *all* of those are
searched for in *every single one* of the paths.
if you happen to have the same filename somewhere anywhere in those
paths, you're hosed.
it's a total global namespace .... nightmare. nnnngh! whyyyy do
they doo thiiiiis!
Post by Philip Hands
As it happens, I fired up my arduino for the first time since doing the
arduino-core uploads last week -- My 5 year old daughter and I are
knocking up something to drive some LEDs and a motor in order to make
her IKEA kitchen have a working turntable in the microwave, and a blue
LED to simulate water coming out of the tap, etc.
ha, cool! yeah i bought something called a "Sparki" robot for me and
lilyana to play with. which was for about... 2 days. the GUI on that
however i have to say is extremely cool. it's block-based like a
jigsaw, and it auto-generates actual code which you can then look at
to see if it does what you expected.
Sounds somewhat like scratch.

Also in the same vein is the thing from microsoft: 'makecode',
that the Love To Code folk at chibitronics are using in conjunction with
the Chibi Chip:

https://makecode.chibitronics.com/

makecode also supports other microcontrollers boards, it seems:

https://makecode.com/

The chibi chip is one of Bunnie's projects, for making it easy to do
clever stuff with circuits made out of sticky copper tape and stick-on
LEDs and sensors -- I'm awaiting one in the post, having found a UK
based seller last week:

https://chibitronics.com/shop/love-to-code-chibi-chip-cable/

Bunnie gave a nice talk about it at CCC last year:

https://archive.org/details/media.ccc.de-33c3-7975-making_technology_inclusive_through_papercraft_and_sound

(for which I happened to be on Main Camera, in the video team filming it)

I particularly like his Sauerkraut analogy about always getting the same
outcome if you start with the same ingredients.

Cheers, Phil.
--
|)| Philip Hands [+44 (0)20 8530 9560] HANDS.COM Ltd.
|-| http://www.hands.com/ http://ftp.uk.debian.org/
|(| Hugo-Klemm-Strasse 34, 21075 Hamburg, GERMANY
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Luke Kenneth Casson Leighton
2017-09-20 16:15:31 UTC
Permalink
Post by Philip Hands
Post by Luke Kenneth Casson Leighton
ha, cool! yeah i bought something called a "Sparki" robot for me and
lilyana to play with. which was for about... 2 days. the GUI on that
however i have to say is extremely cool. it's block-based like a
jigsaw, and it auto-generates actual code which you can then look at
to see if it does what you expected.
Sounds somewhat like scratch.
ah! yes that was the name of its competing... thing.
Post by Philip Hands
The chibi chip is one of Bunnie's projects, for making it easy to do
clever stuff with circuits made out of sticky copper tape and stick-on
LEDs and sensors -- I'm awaiting one in the post, having found a UK
https://chibitronics.com/shop/love-to-code-chibi-chip-cable/
nice! wasn't there some sort of... circuit pen that you could use to
literally draw your own traces? why am i suggesting that you get one
when you know full well that your house - from the downstairs to the
upstairs will instantly be filled with stickers and line-drawings on
the walls... ha, i know why: because i would love to hear that that
actually happened :)
Post by Philip Hands
I particularly like his Sauerkraut analogy about always getting the same
outcome if you start with the same ingredients.
:)

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zap
2017-09-20 19:59:23 UTC
Permalink
I was wondering if you ever thought of creating a hardware encrypted
flash drive?
I know nitrokey is doing this, but I was wondering if you could make one
that could go even up to 128gb and have the software built into it so
that you can set a password from your computer then, everytime you put
it in you have to type the password in. Also there would be options of:

change password
upgrade firmware if wanted
up to four different hidden folders to store files
and of course the strongest encryption + ten mistakes = reset whatever
hidden folder you were trying to get into. meaning the files would all
be wiped off. And yes this could be an option rather than a requirement.

even 64gb would be good to be honest, I just don't like the idea of
having to rely on software that may disappear in the future or die out.

Nitrokey's weakness is you need their app to access your files. alas...
that's why I suggested this.

if you did that, even 64gb I would pay 200$ for something of that sort.
as long as it is gpl3 software that is. :)

Mull it over if you want.

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Christopher Havel
2017-09-20 20:14:07 UTC
Permalink
Forgive my inevitable naivety with regard to this sort of thing, but can't
gparted create encrypted partitions, and why wouldn't that be secure
enough...? My understanding is that it still takes a few hundred years to
crack AES encryption with a standard PC... and the average criminals who
are likely to blackmail you, I can't imagine they're well funded enough to
buy a supercomputer sufficient to pop the lid on those things in a
reasonably timely fashion.

Of course, if you piss off the Russian Mob, that's different, at least
potentially... but that's also a comparatively pretty rare circumstance,
I'd think.
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Philip Hands
2017-09-20 20:32:00 UTC
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Post by Christopher Havel
Forgive my inevitable naivety with regard to this sort of thing, but can't
gparted create encrypted partitions, and why wouldn't that be secure
enough...? My understanding is that it still takes a few hundred years to
crack AES encryption with a standard PC... and the average criminals who
are likely to blackmail you, I can't imagine they're well funded enough to
buy a supercomputer sufficient to pop the lid on those things in a
reasonably timely fashion.
Of course, if you piss off the Russian Mob, that's different, at least
potentially... but that's also a comparatively pretty rare circumstance,
I'd think.
Obligatory XKCD: https://www.xkcd.com/538/ ;-)

Cheers, Phil.
--
|)| Philip Hands [+44 (0)20 8530 9560] HANDS.COM Ltd.
|-| http://www.hands.com/ http://ftp.uk.debian.org/
|(| Hugo-Klemm-Strasse 34, 21075 Hamburg, GERMANY
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Christopher Havel
2017-09-20 20:36:49 UTC
Permalink
The hover text is pretty much my position on the subject -- although I've
been informed that it's a rather obsolescent conclusion. (...to which my
response almost always is, "I'm sorry, sir/madam/etc, but I'm all out of
kitchen foil." ;) )
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zap
2017-09-21 01:49:35 UTC
Permalink
Post by Christopher Havel
Forgive my inevitable naivety with regard to this sort of thing, but can't
gparted create encrypted partitions, and why wouldn't that be secure
enough...? My understanding is that it still takes a few hundred years to
crack AES encryption with a standard PC... and the average criminals who
are likely to blackmail you, I can't imagine they're well funded enough to
buy a supercomputer sufficient to pop the lid on those things in a
reasonably timely fashion.
You could be right, but It would be a good thing for those who lose
things they don't want others to access. also, hardware encryption is
far stronger than software encryption.
Post by Christopher Havel
Of course, if you piss off the Russian Mob, that's different, at least
potentially... but that's also a comparatively pretty rare circumstance,
I'd think.
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Philip Hands
2017-09-21 10:16:26 UTC
Permalink
zap <***@posteo.de> writes:

...
also, hardware encryption is far stronger than software encryption.
Faster (potentially), maybe less open to side-channel attacks (if
properly designed), but I see no reason that the same algorithm
implemented in silicon would be any "stronger" than if it were in
software.

Most of the time, what you're calling hardware is liable to just be
software running on a different processor, perhaps in a box that has
been glued shut such that it's less convenient for bugs to be found,
fixed and patched.

Cheers, Phil.
--
|)| Philip Hands [+44 (0)20 8530 9560] HANDS.COM Ltd.
|-| http://www.hands.com/ http://ftp.uk.debian.org/
|(| Hugo-Klemm-Strasse 34, 21075 Hamburg, GERMANY
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Luke Kenneth Casson Leighton
2017-09-21 11:10:55 UTC
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Post by Philip Hands
Most of the time, what you're calling hardware is liable to just be
software running on a different processor, perhaps in a box that has
been glued shut such that it's less convenient for bugs to be found,
fixed and patched.
glued shut, electric fences added which electrocute the user, or run
the instruction "HCF" [Halt and Catch Fire. mythical iinstruction
which was supposed to be in the 68000 or perhaps the 8086, but was
actually down to running a loop of instructions that flipped IO and
internal logic so hard that the processor overheated). :)

the latest freescale has an on-board Cortex M0 i think it is, which is
ultra-low-power enough to run permanently on battery, so you can do
tamper-detection.

you'll like this: when i was working for NC3A i was asked to help
with a little ethernet network box that transferred data from a
low-security environment to a high-security one. the rule was simple:
absolutely no physical connection, and absolutely no data must travel
- ever from the high security level to the low security one.

that *includes* ICMP packet responses which are normally used to
acknowledge and set up even a *UDP* connection.

so somebody wrote a *modified* TCP stack which took out the need for
ICMP traffic... but it went way waaay further than that.

the metal box was implemented as an ultra-low power receiver /
transmitter pair, with a metal firebreak and a tiny hole between for
the radio signal to get through on a Coax cable (so that there was no
data leakage by emitted radio waves).

power was SEPARATELY provided on both sides of the box.

then.... when it was confirmed 100% working, the ENTIRE BOX WAS
FLOODED WITH RESIN.

bit of a heat problem, that....

baiscally what i'm saying, with this story is: the tricky part will
not be the software at all: the tricky bit will be getting a processor
into a tamper-resistant, tamper-detecting box.

l.

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Tor, the Marqueteur
2017-09-21 15:06:30 UTC
Permalink
On 09/21/2017 01:10 AM, Luke Kenneth Casson Leighton wrote:
...snip...
Post by Luke Kenneth Casson Leighton
baiscally what i'm saying, with this story is: the tricky part will
not be the software at all: the tricky bit will be getting a processor
into a tamper-resistant, tamper-detecting box.
I can't vouch for them, but ISTR a project on Crowd Supply to produce a
USB password storage device. Been too long to recall how well it meets
the criteria for real security.

OT: I've recently gotten back to reading the list after all the list
emails got sent to spam for a while.

Tor
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808-828-1107
GPG Key: 2BE1 426E 34EA D253 D583 9DE4 B866 0375 134B 48FB
*Be wary of unsigned emails*

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Luke Kenneth Casson Leighton
2017-09-21 16:45:46 UTC
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https://www.crowdsupply.com/third-pin/pastilda

same sort of thing. basically they use an STM32F4 (both of them).
btw when you next speak to them, mention libopencm3 and the fact that
i use the STM32F072... there is *absolutely no need* for proprietary
firmware-flashing tools with the STM32F range *at all*.

l.

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Luke Kenneth Casson Leighton
2017-09-21 17:10:38 UTC
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---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Thu, Sep 21, 2017 at 5:50 PM, Alexander Ross
heres there article about smartcards and nitrokey
https://www.devever.net/~hl/smartcards
thoughts? :/
pretty interesting. says it all...

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