Digispark (Arduino clone with ATtiny85)
Marco
Akiba
Most likely, they’re bitbanging the USB using the lowspeed USB protocol. Goddam! $140k for an ATTiny board. Gotta get me some project on kickstarter.
Akiba
FreakLabs Open Source Wireless
Shop:http://www.freaklabsstore.com
Twitter: http://www.twitter.com/freaklabs
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Torsten Wagner
some people really have a strange worldview...
if I *donate* $1000 or resp. $500 they still ask me to add $20 for
shipping cost.... ?!?!?!
Serious!
We are all ear about your kickstart idea Akiba !!!
Just a hint.... still waiting for this tiny FREAKARM-Linux embedded
board which focus on measurement and control instead of multimedia
(many I/Os, decent ADCs and DACs, RTC, etc.)
Totti
Marco
Nava Whiteford
@Dennis and @Dinesh - The bootloader waits 5-10 seconds (not final yet) for incoming code at power on,
if it doesn't seen any it goes to the program loaded, if it does it loads the code. The USB
communication is achieved by a virtual usb port running from the attiny85
(see the V-USB project for an idea how we do that).
Re kickstarter I agree, suggest this: http://xkcd.com/1055/
I also think a bitcoin smart card would make a great kickstarter project...
On Wed, Aug 22, 2012 at 04:11:27PM +0900, Akiba wrote:
> Most likely, they're bitbanging the USB using the lowspeed USB protocol.
> Goddam! $140k for an ATTiny board. Gotta get me some project on kickstarter.
>
>
>
> Akiba
>
> FreakLabs Open Source Wireless
>
>
> Shop: <http://www.freaklabsstore.com> http://www.freaklabsstore.com
>
> Twitter: <http://www.twitter.com/freaklabs>
> http://www.twitter.com/freaklabs
>
>
>
> _____
Akiba
No, the IDE just sends data serially at some bitrate dependent on the board setting. As long as the STK500 bootloader protocol is used, it doesn’t matter if it’s a bit-banged USB, FTDI, etc. Most likely, they are using V-USB and have integrated it into a custom bootloader.
Akiba
FreakLabs Open Source Wireless
Shop:http://www.freaklabsstore.com
Twitter: http://www.twitter.com/freaklabs
Akiba
Shop:http://www.freaklabsstore.com
Twitter: http://www.twitter.com/freaklabs
Marco
Torsten Wagner
V USB "simply" emulates the entire USB stack in software including the parts which are normally covered by dedicated hardware.
From the developer side it is tricky since you need to make sure you get all the timings right. From the user view its limited because more complex stacks (eg usb host functionality) can't be emulate fast enough in software (on the given target architecture). For the same reason it's limited to lower speeds too. It is impressive that the VUSB des got it right on such a small uC already.
Another drawback is the consumption of memory space which is already rather limited.
The biggest advantage is the almost free USB interface... Perfect for small projects.
Totti
To view this discussion on the web visit https://groups.google.com/d/msg/tokyohackerspace/-/55qNZCc3EQMJ.