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From: Rich Webb on 11 Jan 2010 15:04
On Mon, 11 Jan 2010 13:34:41 -0500, Rich Webb
<bbew.ar(a)mapson.nozirev.ten> wrote:

>On Mon, 11 Jan 2010 18:44:41 +0100, "aleksa" <aleksazr(a)gmail.com> wrote:
>
>>I've looked at farnell, there are some 450 MPUs and thousands of MCUs,
>>which one should I learn, considering:
>>
>>I'm currently using a standard x86-32 PC for my project,
>>but would like to replace the whole motherboard with
>>just two chips: cpu and memory.
>>
>>The code for x86 is written (by me) in ASM, about 64k in size.
>>
>>This is what I need:
>>
>>1. 32-bit CPU
>>
>>2. 128k of internal CODE memory, ISP and IAP.
>> (in-system, in-application programmable)
>>
>>3. min 32MB of DATA memory.
>> (maybe SDRAM, directly connected to CPU)
>>
>>4. embedded FPU (or a free, precise library).
>>
>>5. QFP package (not BGAs).
>>
>>6. price: under 30 EUR.
>>
>>7. free develepment tools.
>
>Well, there's the LPC2105 from NXP (nee Philips). Under US$10 in
>quantity ones. Memory is onboard, so this is a one-chip solution.

To quote Homer Simpson (in honor of his 20th anniversary): D'Oh!

You wanted >M< B not >K< B... Fortunately, NXP (et al.) does have
inexpensive ($12-15) microcontrollers that do support external SDRAM.
Their parametric search is the place to look (several options) but one
example is the LPC2292.

--
Rich Webb Norfolk, VA
From: Bob on 11 Jan 2010 17:54
On 11 Jan, 17:44, "aleksa" <aleks...(a)gmail.com> wrote:
> I've looked at farnell, there are some 450 MPUs and thousands of MCUs,
> which one should I learn, considering:

ARM meets most of your requirements apart from FPU. I would look at
AT91SAM9260, There is a LQFP part but Farnell don't appear to sell it.
I assume you are looking for low quantities, and you didn't mention
CPU speed. I would also look at using a system module.

Personally I would start with one of the many ARM eval/SBC boards
(several low cost options) and take it from there. I have been working
with a Mini2440 board recently.



From: aleksa on 13 Jan 2010 09:16
> ARM meets most of your requirements apart from FPU. I would look at AT91SAM9260.

I knew I'll have to learn ARM someday!

On the first look, ARM has some pretty strange instructions,
(what, no CALL, only one-deep BL?) don't know yet if conversion
from x86 to ARM is doable...? (did a Z80 > x86, it was simple)

AT91SAM9260 looks good, thanks.

I've downloaded SAM-BA app from atmel,
but found no schematics for programming cable.
(haven't read the FAQs yet)

'9260 must have at least two external components:
1. dataflash (holds the code for booting only)
2. sdram (holds code and data for normal operation)
right?

> There is a LQFP part but Farnell don't appear to sell it.

Schukat does:
http://www2.schukat.com/schukat/schukat_cms_en.nsf/index/CMSDF15D356B046D53BC1256D550038A9E0?OpenDocument&wg=Y4716&refDoc=CMS4973C58BAA4AC604C12570DE0037E4FA


From: aleksa on 13 Jan 2010 09:16
> That's an unusual combination.
> ASM.X86+32MB SDRAM could point to the Atom, under e30,
> but not qfp.
> or http://www.pcengines.ch/platform.htm ?
>
> If you don't mind shifting all that asm, then look at
> http://ics.nxp.com/lpcxpresso/~LPC3130/#LPC3130
> These lpcxpresso modules are cheap, and make bga a
> don't-care - with luck, the 3130 module will have SDRAM?.
>
> The smaller LPCxpresso's use the LPC3130 as the USB interface!
> or even this ?
> http://www.embeddeddeveloper.com/group/1473/Zilog%C2%AE,-Inc./Encore!-32%E2%84%A2-Series-Z32AN.htm

None of your suggestions use QFP.


From: aleksa on 13 Jan 2010 09:17
> Floating point libraries for the 32-bitters have,
> in my experience, become quite reliable; I think
> that the gnu library should work just fine for you.

Honestly, I don't know anything about gnu.

I am now overloaded with information, so w/o searching
for gnu libraries, I have two questions:

How many bytes are used to represent a number?
(8 bytes is what I use now)

I suppose it is written in C, can it be linked with asm?


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