MegaSquirt

[Bruce Bowling]

I chose the GP32 because it works in this application, and it is easily 
available (and in stock) from places like Digi-Key and Newark. Yes, the 
HC12 family will also work, as well as the AVR family, Microchip, powerpc, 
arm, mips, Pentium, etc. - there are many solutions. I close the GP32 and 
it works for this application, and it keeps up with fuel calculation at 
16,000 RPM, plenty for me. At this point in the game I do not want to 
change a working processor with another processor - it have many other 
things to do, and when the exercise is done I will end up with yet another 
version that also works. Thanks for the offer of code conversion, and it 
you want to spin a board with the HC12 all of the information is on the WWW 
site. I personally would like to see other EFI systems out there with other 
processors, just to compare performance, etc.

Also keep in mind, there are about 250 or more EFI332 boards floating out 
over the world, which also performs 32 bit math,  10-bit ADC, 16-channel 
TPU, 8-output octal switch, direct stepper motor support, etc., and Jeff 
Clarke and Al Grippo both have operational code available. This would be a 
better target for a more substantial system, and I was hoping that soneone 
would have already made one of these boards more generic.

- Bruce

>----------------------------------------------------------------------
>
>Date: Fri, 12 Oct 2001 09:33:24 +1000
>From: "Wayne Macdonald" <wmcdonal at optushome.com.au>
>Subject: Re: MegaSquirt
>
>I was just wondering why you chose the 68HC908GP32 instead of the
>68HC912B32, The HC12 offers a number of improvements, It has 32 bit math,
>768 bytes of EEProm , 10 bit A/D, 8 input/output timed capture/compare lines
>and the code conversion is easy.
>I doubt that the extra cost would impact the final price much and I will
>convert all the assembler code if you like. I can also provide a bootloader
>and PC software to field upgrade the microcode.
>
>Wayne.
>
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---------------------------------------------
              Bruce A. Bowling
          bbowling at earthlink.net
    http://home.earthlink.net/~bbowling
---------------------------------------------

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