uControls that can handle higher level math

srfranci · 13th February 2006, 06:27 AM

I've only had experience with pic's, and those are limited to add, subtract, and to my knowledge basic routines for mult and div. Does anyone have any experience with higher level processors and know where to steer me? I'd like to be able to do math like trig, calc, DE's, etc. but hard coded into the hardware. I know I could potentially do something software based such as a mini via motherboard / linux or windows, but that seems overly extreme for routine, although complex, calculations.

BTW, I'm going to use this for redesigning my car ECU and integrating some other stuff. Not exactly audio related, but I got a lot of help with my orions on this forum so I figured someone might know something.

In short, I need something somewhere in between a pic and and a desktop processor.

neutron7 · 13th February 2006, 07:56 AM

maybe you could use a "BASIC stamp" which is a little board that can run BASIC programs .

they have been around for a while, maybe there is something better now.

im not sure what functions it supports but im sure google can help you with that

Nigel Goodwin · 13th February 2006, 09:38 AM

A BASIC STAMP is no use, they just run a slow BASIC interpreter inside a PIC.

I don't know of any micro-controllers with maths co-processors?, bear in mind it's only since the Pentium that Intel have been including them in their processors (the 486 only had some with them).

I would suggest you need to think more about it?, sensible design will probably remove your requirement for it?.

Ouroboros · 13th February 2006, 11:00 AM

If you're into car ECU design, have you looked at the Megasquirt and Megajolt projects on the web?

phase_accurate · 13th February 2006, 11:29 AM

There are newer PIC chips with a DSP core. While these do not support trigonometry and the like they can be implemented by software.

Regards

Charles

srfranci · 13th February 2006, 03:00 PM

I was just thinking. Does anyone know what chips are inside the TI calculators or HP?

neutron7 · 13th February 2006, 03:11 PM

How about via nano ITX its 12x12 CM and about as powerful as a celeron 600 or so

xplod1236 · 13th February 2006, 03:46 PM

Quote:

Originally posted by srfranci
I was just thinking. Does anyone know what chips are inside the TI calculators or HP?

The TI-89 has a Motorola 68000

DSP_Geek · 13th February 2006, 08:03 PM

Modulo using some part with a heavy math coprocessor (hello Pentium!), doing trig involves math routines, ideally coded in assembly. The techniques are well-known (check Numerical Recipes for hints), and depending on the processor you might even be able to find prebuilt libraries.

Calculus is always done numerically in real-time contexts, but for most problems that's exactly what you want anyway.

Long story short, for your application either you run a Pentium or you learn to really love assembler.

Cheers & good luck,
Francois.

Loial · 13th February 2006, 10:36 PM

Using real-time calculations in a car ECU puts very high demands on the processor, therefore (as far as I know), todays injection controllers simply look up pre-calculated values from (EEP)ROM.

13th February 2006, 06:27 AM	#1
srfranci diyAudio Member Join Date: Oct 2004	uControls that can handle higher level math I've only had experience with pic's, and those are limited to add, subtract, and to my knowledge basic routines for mult and div. Does anyone have any experience with higher level processors and know where to steer me? I'd like to be able to do math like trig, calc, DE's, etc. but hard coded into the hardware. I know I could potentially do something software based such as a mini via motherboard / linux or windows, but that seems overly extreme for routine, although complex, calculations. BTW, I'm going to use this for redesigning my car ECU and integrating some other stuff. Not exactly audio related, but I got a lot of help with my orions on this forum so I figured someone might know something. In short, I need something somewhere in between a pic and and a desktop processor.

13th February 2006, 09:38 AM	#3
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	A BASIC STAMP is no use, they just run a slow BASIC interpreter inside a PIC. I don't know of any micro-controllers with maths co-processors?, bear in mind it's only since the Pentium that Intel have been including them in their processors (the 486 only had some with them). I would suggest you need to think more about it?, sensible design will probably remove your requirement for it?. __________________ Nigel Goodwin

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13th February 2006, 07:56 AM	#2
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	maybe you could use a "BASIC stamp" which is a little board that can run BASIC programs . they have been around for a while, maybe there is something better now. im not sure what functions it supports but im sure google can help you with that

13th February 2006, 11:00 AM	#4
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	If you're into car ECU design, have you looked at the Megasquirt and Megajolt projects on the web?

13th February 2006, 11:29 AM	#5
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	There are newer PIC chips with a DSP core. While these do not support trigonometry and the like they can be implemented by software. Regards Charles

13th February 2006, 03:00 PM	#6
srfranci diyAudio Member Join Date: Oct 2004	I was just thinking. Does anyone know what chips are inside the TI calculators or HP?

13th February 2006, 03:11 PM	#7
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	How about via nano ITX its 12x12 CM and about as powerful as a celeron 600 or so

13th February 2006, 08:03 PM	#9
DSP_Geek diyAudio Member Join Date: Aug 2003 Location: Santa Cruz, California	Modulo using some part with a heavy math coprocessor (hello Pentium!), doing trig involves math routines, ideally coded in assembly. The techniques are well-known (check Numerical Recipes for hints), and depending on the processor you might even be able to find prebuilt libraries. Calculus is always done numerically in real-time contexts, but for most problems that's exactly what you want anyway. Long story short, for your application either you run a Pentium or you learn to really love assembler. Cheers & good luck, Francois.

13th February 2006, 10:36 PM	#10
Loial diyAudio Member Join Date: Nov 2004 Location: Gävle	Using real-time calculations in a car ECU puts very high demands on the processor, therefore (as far as I know), todays injection controllers simply look up pre-calculated values from (EEP)ROM.

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