comp.arch.embedded Google Group

Re: How to synchronize a streaming system with FPGA+FT2232H FIFO

d...@designgame.ca (dlopez) — Sat, 11 Nov 2009 01:16:07 UT

Hi,
This is all getting clearer now. However, I wonder if using this FT2232H IC
in synchronous FIFO mode isn't complicating everything. Isn't all of this
'packet' and 'layer' and 'CRC' stuff handled by the clever people who
designed USB in the first place?
Then I use a chip which takes care of all of this, but only give me access

Re: How to synchronize a streaming system with FPGA+FT2232H FIFO

usene...@ladybug.xs4all.nl (Arlet) — Sat, 11 Nov 2009 00:54:08 UT

You could use HDLC, which does what you want, is standard, and not too
complicated.
[link]
You can use the address byte to switch between data and control streams.

Re: Mensuration device parameterization scheme [VERY long]

not.going.to...@seen.com (D Yuniskis) — Fri, 11 Nov 2009 23:40:20 UT

Ooops! That was intended for an email message! :-(
(a hazard of having email and news handled in the same
client!)
Sorry...

Re: Friday afternoon C trivia:

no.s...@please.net (Clifford Heath) — Fri, 11 Nov 2009 22:51:35 UT

Nils wrote:
The correct answer is, none of them. You can't assign a void type.
You need to cast the pointer to something else, and then it's not
the same pointer, is it?
Had you done the same thing with char however, the answer is based
on a simple principle; const applies to the thing to its immediate

Re: Friday afternoon C trivia:

al...@theworld.com (mac) — Fri, 11 Nov 2009 22:06:56 UT

See above. It might claim to be "long", but you have to look up the
declaration to see that it isn't.
Reminds me of a Pascal textbook that included exapmples with
const NINE = 9;
Presumably this allows the program maintainer to easily change the value
of NINE to something else, such as 7.
Since this is comp.arch.embedded, it's excusable that we're still

Re: "Pulse" gel-cell charge strategy?

zwsdot...@gmail.com (larwe) — Fri, 11 Nov 2009 21:35:07 UT

It all depends where you put your break-even point; a thousand-year
payoff? :)
No, this is waste energy in fact.
They're propane though, aren't they?

Re: New Atmel ATtiny Microcontrollers have 6 Pins, ADC, and LOW Power Consumption

jim.granvi...@gmail.com (-jg) — Fri, 11 Nov 2009 21:33:23 UT

A wry smile perhaps, but I actually do have here,
emulation parts with connection 'out the top' !!
So it has already been done :)
However, perhaps more practical, is the 'more pins' choice, and that
has also been done.
Winbond and Fairchild are two suppliers I know OTTOMH that supply
bigger-bonded emulation - usually adding 2-4 more pins.

Re: "Pulse" gel-cell charge strategy?

jim.granvi...@gmail.com (-jg) — Fri, 11 Nov 2009 21:25:23 UT

So this project has no dollars per watt metric, that
it needs to meet ? ;)
Surely the power generation is _not_ the primary goal here ?
We have Bird Scarers here, that use similar 'sporadic explosion' basis
- called 'Bird cannon'
-jg

Re: Mensuration device parameterization scheme [VERY long]

not.going.to...@seen.com (D Yuniskis) — Fri, 11 Nov 2009 20:24:28 UT

Well, it took a while to prototype (bad time of year to get
anything *done* :< ) but this seemed to work quite well.
I still haven't figured out how to resolve conflicting
requests -- except to push that decision into the
applications themselves -- but, as with anything "new",
experience will suggest a suitable fix.

Re: "Pulse" gel-cell charge strategy?

zwsdot...@gmail.com (larwe) — Fri, 11 Nov 2009 19:51:41 UT

Yes, this project has similar problems to solve. Hence the desire for
no unnecessary moving parts.
Don't forget to add 1100ft of AWG 0000 copper wire to your shopping
list. You may wish to rent a truck... and an armed guard ;) Of course
you could make a scaled-down version with magnet wire, but that simply

Re: Friday afternoon C trivia:

not.going.to...@seen.com (D Yuniskis) — Fri, 11 Nov 2009 19:40:48 UT

Agreed. It is far too easy for people reading code ex post facto
to "read what they want to read" (i.e., "see what they hope to see")
and not what the code actually *says*. Writing good code means
writing code that is easily understood and so needless careless
mistakes are minimized.
For example, I parenthesize arithmetic expressions involving anything

Re: Endianness macros

not.going.to...@seen.com (D Yuniskis) — Fri, 11 Nov 2009 19:31:44 UT

Noob wrote:
[snip]
Actually, I suspect that is a big part of the problem!
It implies that the "device" (addresses) being accessed is
external to the processor itself (you haven't mentioned
specifics -- processor, device, etc.).
A Little Endian processor stores LSB at lower address
and MSB at next higher address (I make no claims yet about the

Re: "Pulse" gel-cell charge strategy?

mborger...@comcast.net (Mark Borgerson) — Fri, 11 Nov 2009 19:12:37 UT

In article <4B0FD7A9.D0599...@bytecraft.c om>, wal...@bytecraft.com
says...
Sounds like a neat idea for dairy farms and landfills. Lots of
methane generated in manure digesters and in the land fill. Our
local landfill runs a gnerator with some of their gas---but the
gas requires a lot cleaning lest H2S corrode the generator.

Re: SiLab C8051F064, SPI, 3/4 wire, P0.3, NSSMD problem

first.l...@verizon.net (Gene S. Berkowitz) — Fri, 11 Nov 2009 19:08:17 UT

In article <7n9ugmF3knom...@mid.individua l.net>,
B...@SynectixLtd.com says...
I would check your crossbar configuration again; I think you
might have P0.3 configured as MISO.

MISO is likely configured as open-drain. Are you relying only on
the weak internal pullup? Try something stiffer.

Re: How to synchronize a streaming system with FPGA+FT2232H FIFO

t...@seemywebsite.com (Tim Wescott) — Fri, 11 Nov 2009 19:04:54 UT

Yes. Although if the cost of misreading a command is low enough you
could maybe just go ahead and execute.
An example of a high-cost command would be one that triggers a charge of
dynamite -- you don't want that one executed unless it's really right.
An example of a low-cost command might be a chunk of sound for a speaker