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Re: Floating Point using AN974 with MC9S12A256
by ga5941
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--- In 68HC12@..., David Armstrong <mamoru.tbreesama@...> wrote:
>
> If you have a working version of the AN974 Floating point code, why not
> share it with the rest of the community here? I'm sure there are several
> individuals that would like to see and use it.
>
> Dave
>
> On Thu, Apr 30, 2009 at 4:48 PM, ga5941 <ga5941@...> wrote:
>
> >
> >
> > Earlier I reported a problem(16296)using AN974, MC68HC11 Floating Point
> > Package by Gordon Doughman. I'm now happy to report that I have resolved the
> > problem and it wasn't with AN974. My floating point calculations in assembly
> > code are working correctly including trig functions. The package, however,
> > does not include an Arctan function. I have written my own, in assembly of
> > course, using the Cordic algorithm. The Arctan function is necessary for
> > converting celestial coordinates RA and DEC to earth based coordinates ALT
> > and AZ.
> >
> > A reply to my original note suggested a possible difference between HC11
> > and HC12 regarding stack operations but I have found none when using AN974.
> >
> > Thanks to all that replied.
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>After extensive search of Freescale files, I found the AN974/D document. It is type .pdf, 745 KB. You can download it from:
http://www.freescale.com/files/microcontrollers/doc/app_note/AN974.pdf?fpsp=1&WT_TYPE=Application%20Notes&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=pdf&WT_ASSET=Documentation
It was located with the application notes for the MC68HC11 micros. I did not find the actual software file itself though it is listed in the AN974/D document. The actual code file is about 2 KB. I do not have my own website but can send it in an e-mail as a file attachment to someone who maintains a website. Any volunteers?
The routine for Arctan(X) that I wrote in assembly code also includes Arcsin(X) and Arccos(X) and runs 249 bytes. To obtain a proper understanding of it one should also read this paper:
http://www.andraka.com/files/crdcsrvy.pdf
and another that I downloaded from the internet but is no longer accessible. This one runs about 48 Kb.
I would be happy to help anyone who needs this material. Perhaps it could be done through this 68HC12 Yahoo group through the file system.
I don't know how to use the file system, perhaps someone could walk me through it. My email addr is ga5941@...
Gil
>
> If you have a working version of the AN974 Floating point code, why not
> share it with the rest of the community here? I'm sure there are several
> individuals that would like to see and use it.
>
> Dave
>
> On Thu, Apr 30, 2009 at 4:48 PM, ga5941 <ga5941@...> wrote:
>
> >
> >
> > Earlier I reported a problem(16296)using AN974, MC68HC11 Floating Point
> > Package by Gordon Doughman. I'm now happy to report that I have resolved the
> > problem and it wasn't with AN974. My floating point calculations in assembly
> > code are working correctly including trig functions. The package, however,
> > does not include an Arctan function. I have written my own, in assembly of
> > course, using the Cordic algorithm. The Arctan function is necessary for
> > converting celestial coordinates RA and DEC to earth based coordinates ALT
> > and AZ.
> >
> > A reply to my original note suggested a possible difference between HC11
> > and HC12 regarding stack operations but I have found none when using AN974.
> >
> > Thanks to all that replied.
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
http://www.freescale.com/files/microcontrollers/doc/app_note/AN974.pdf?fpsp=1&WT_TYPE=Application%20Notes&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=pdf&WT_ASSET=Documentation
It was located with the application notes for the MC68HC11 micros. I did not find the actual software file itself though it is listed in the AN974/D document. The actual code file is about 2 KB. I do not have my own website but can send it in an e-mail as a file attachment to someone who maintains a website. Any volunteers?
The routine for Arctan(X) that I wrote in assembly code also includes Arcsin(X) and Arccos(X) and runs 249 bytes. To obtain a proper understanding of it one should also read this paper:
http://www.andraka.com/files/crdcsrvy.pdf
and another that I downloaded from the internet but is no longer accessible. This one runs about 48 Kb.
I would be happy to help anyone who needs this material. Perhaps it could be done through this 68HC12 Yahoo group through the file system.
I don't know how to use the file system, perhaps someone could walk me through it. My email addr is ga5941@...
Gil
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