Re: ARM9 Choice

icegray <icegray@xxxxxxxxx> wrote:
On Feb 25, 6:32═pm, Tim Wescott <t...@xxxxxxxxxxxxxxxx> wrote:
On Mon, 25 Feb 2008 09:54:35 -0600, Vladimir Vassilevsky wrote:
icegray wrote:

Hi,
I am looking for cpu for a automotive infotainment project. Project
details are 800x600 lcd, graphical charts, graphical user interfaces,
audio (MP3 and Radio), CAN Bus communication, probably embedded linux,
maybe rear camera and gps, etc.

You need a Pentium class industrial PC with WinCE or Embedded XP.

ok maybe ARM9 performance not enough but why windows? could you please
explain more?


Unless, of course, you want your device to have a low enough COGS to both
sell and make money for your company. ═

The above mentioned combination may be the best to _prototype_ the
product, but I wouldn't rule it in for the real product, particularly if
you're going to be shipping in high enough volumes to justify some
serious engineering.

I doubt that you'll find one processor that does all that you want all by
itself. ═The biggest driver to processing power that I can see is video,
and even that is highly variable depending on what you want to do:

* Are you going to stream video at all? ═If everything else can go at
"GUI" speeds your processor can be modest. ═This means that having that
rear-view camera is going to make an expensive step in your COGS.

* Are you going to stream video through the processor? ═I.e., can you get
by with a chipset that hijacks part of the screen for video without
running the data through the processor, or are you going to do something
like use a USB or Firewire camera and have the processor fondle every
byte that goes through?

* Are you going to decompress video in the processor? ═Are you going to
be playing MPEG files and DVDs? ═If _that's_ the case then maybe
Vladimir's Pentium is a candidate, although for a large production run
you could probably do better with a more modest 'main' processor that's
getting serious help from a DSP chip, an FPGA, an ASIC, or a dedicated
video decompresser (if such things exist these days).

You are right this device should be cost-effective. I am not sure now
that i will use what kind of camera. This device do not play any kind
of video, there are only one video source and it is rear-view camera.
If ARM9 not enough for handle video i can use ASIC for LCD driving and
camera data streaming.

You can use e.g. something from DaVinci family from TI. It will work much
better than a Pentium-XYZ, you don't need Windoze, it will drive your LCD,
videocamera and everything else (probably excluding CAN) right off the chip.
It will cost less than Pentium-XYZ and Linux is totally free. You will get
all the graphics and GUI you need with it and it will draw 100 times less
power.

Don't buy Windoze crap. It is not worth it.

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