In article <firstname.lastname@example.org>, Vladimir Vassilevsky <antispam_bo...@hotmail.com> wrote:
> problems@gmail wrote:
> > Vladimir Vassilevsky wrote:
> >>I've been doing the designs with Blackfin since 2003 and still do,
> >>and I can tell you that Blackfin is same as crap as all other MCUs
> >>and CPUs.
> > ] Speaking of BlackFin, it was initially seen as the CPU for the
> > ]cellphones. When it became apparent that they missed the market,
> > ]Intel pulled out the plug, leaving ADI with the unripe project.
> > ]ADI put the things together as they could, and released the
> > ]obviously incomplete processor. Sadly enough, the original
> > ]concept was appealing. Now ADI is pathetic in pushing
> > ] BlackFin in all directions, including those where BlackFin
> > ] doesn't fit (like the consumer video, for example).
> > So it's got low power consumption ?
> Although Blackfin consumes somewhat less power then the other DSPs,
> I wouldn't call it the low power processor.
> > How would it be for a 2..4 AA-cell driven Ebook ?
> > Or is the CPU power consumption irrelevant compared
> > to a 80 * 20 char display ?
> The very minimum power consumption of Blackfin is at the order of 80mA
> at 3.3V. This is if the core is running at 24MHz and idling most of the
> time. At full speed, BlackFin burns about a couple of watts.
> > How's the uClinux project/capability ?
> Kinda working. As good as the illustration of the possibility.
> If you want BlackFin to run with the speed of AVR, use ucLinux.
> uClinux is linux without MMU, which is nonsense indeed.
> Vladimir Vassilevsky
> DSP and Mixed Signal Design Consultant
So then what device/configuration would you advise for a
black & white 80 char wide, probably 20 lines, reader from
eg. CF, running from 2 to 4 rechargable AA cells & no-frills
miminal cost ?
== Chris Glur.
Reply by Vladimir Vassilevsky●August 3, 20082008-08-03
> So then what device/configuration would you advise for a
> black & white 80 char wide, probably 20 lines, reader from
> eg. CF, running from 2 to 4 rechargable AA cells & no-frills
> miminal cost ?
The task is stated very vaguely; it can be anything from as simple as
PIC/AVR to as complex as iPod/TabletPC depending on what the device
should be capable of.
DSP and Mixed Signal Design Consultant
Reply by ●August 7, 20082008-08-07
In article <JQjlk.email@example.com>, Vladimir Vassilevsky
> firstname.lastname@example.org wrote:
> > So then what device/configuration would you advise for a
> > black & white 80 char wide, probably 20 lines, reader from
> > eg. CF, running from 2 to 4 rechargable AA cells & no-frills
> > miminal cost ?
> The task is stated very vaguely; it can be anything from as simple
> as PIC/AVR to as complex as iPod/TabletPC depending on what the
> device should be capable of.
It starts from the belief that the 'one laptop per child'
hyped-idea from MIT can't handle the lack of mains electricity
in 3rd world locations.
So the 2 to 4 rechargable AA's need to give about 8 hours
reading. I didn't yet find out about display power consumption,
and a 'hi-volume used for other devices' display would be used.
Of course if the display's consumption is significant then the
CPU is less relevant. I guess a 8-bit CPU would do, except for
the lack of ability to leaverage existing software, eg. uclinux.
Here's some ideas of required capabilities for the student/reader:
* hyper link to random sections,
* bookmark where I was last time,
* bookmark the stuff/s that I want to show Joe & Jill..
* cutNpaste ..........
* search: where-else/if XYZ was mentioned........
* embed(?sp) [simple] sketches in the text...posibly animated
* ... etc. ..your ideas/requirements...
So, I realise that the half second delay of low-power Epaper
is a problem for eg. cutNpaste.
I'm thinking of a 5 or 10 finger-capacitive-pad input
Probably the starting decision must be the display ?
Thanks for any feedback,