Post by thread:FFT engine in Hi-Tech C

Colleagues, Following on from recent topics, I'm going to try to convince my colleague/boss to move the PIC 17C44-based project we're working on from MPASM to Hi-Tech PIC C because I need to do some fairly heavy duty 32-bit maths and, frankly, we are already running late with the development activity. I do have one problem. I need to do an FFT on a short sound bite (1024 samples). I originally chose to develop this project in assembly language (MPASM-compatible) because Microchip publish an assembly language FFT module. However, I find that Hi-Tech's assembler won't assemble Microchip's FFT module due to endless minor syntactical and lexical differences. Nor will Hi-Tech's linker work with MPASM object files, so I can't mix Microchip assembler source with Hi-Tech C source. So, it looks like I'm knackered unless I can find an FFT module that will integrate with Hi-Tech C. It doesn't matter if it's in Hi-Tech-compatible assembler, C source or even an object file. I just need an FFT module that I can use in a Hi-Tech C project. Can anyone help? Is there such a module? I'm sure I can't be the first person to want to do this! Thanks in anticipation. Steve Steve Thackery Suffolk, England. Web Site: http://www.btinternet.com/~stevethack/

Steve, Undoubtedly someone else on this list will simply have the exact source code that will compile up and do the job under Hi-Tech C, but as a general matter of course, two excellent places to look for this kind of thing are: http://www.netlib.org/ and http://math.nist.gov/gams/ Also, I did a search on http://www.google.com for the words "FFT source code", and came up with 3299 hits, So I tried "FFT source code PIC" and got 241 hits. "FFT source code PIC Microchip" gave 26, although a good half of them were PICLIST posts :-) Among those last 26 posts, I found the following article which you may find interesting... http://www.edtn.com/embapps/emba035.htm --Bob On Fri, Sep 03, 1999 at 12:18:14AM +0100, Steve Thackery wrote: > Colleagues, > ... > So, it looks like I'm knackered unless I can find an FFT module that will > integrate with Hi-Tech C. It doesn't matter if it's in Hi-Tech-compatible > assembler, C source or even an object file. I just need an FFT module that > I can use in a Hi-Tech C project. > ... -- ============================================================ Bob Drzyzgula It's not a problem spam_OUTbobTakeThisOuTdrzyzgula.org until something bad happens ============================================================

Steve Thackery wrote: > > > However, I find that Hi-Tech's assembler won't assemble Microchip's FFT > module due to endless minor syntactical and lexical differences. Nor will > Hi-Tech's linker work with MPASM object files, so I can't mix Microchip > assembler source with Hi-Tech C source. It will work with MPC. (would have worked?) I've used some Mchip asy samples with MPC before. Geez are you guys *ever* going to learn? <G> Take it away, Andy! ;) -- Friendly Regards /"\ \ / Tjaart van der Walt X ASCII RIBBON CAMPAIGN .....tjaartKILLspam@spam@cellpt.co.za / \ AGAINST HTML MAIL |--------------------------------------------------| | GSM Technology for Positioning and Telematics | | Cellpoint Systems SA http://www.cellpt.com | | http://www.wasp.co.za/~tjaart/index.html | | WGS84 -26.0124 +28.1129 Voice +27 (0)11 2545100 | |--------------------------------------------------|

At 06:05 3/09/99 +0200, you wrote: >Steve Thackery wrote: >> >> >> However, I find that Hi-Tech's assembler won't assemble Microchip's FFT >> module due to endless minor syntactical and lexical differences. Nor will >> Hi-Tech's linker work with MPASM object files, so I can't mix Microchip >> assembler source with Hi-Tech C source. > >It will work with MPC. (would have worked?) >I've used some Mchip asy samples with MPC before. > >Geez are you guys *ever* going to learn? <G> Take it away, Andy! ;) Perhaps you should threaten them at gunpoint <G> But I don't think taht even the bigest stick will help. But one has to ask, why would you want to mix gold with lead? Dennis {Quote hidden}> >-- >Friendly Regards /"\ > \ / >Tjaart van der Walt X ASCII RIBBON CAMPAIGN >tjaartKILLspamcellpt.co.za / \ AGAINST HTML MAIL >|--------------------------------------------------| >| GSM Technology for Positioning and Telematics | >| Cellpoint Systems SA http://www.cellpt.com | >| http://www.wasp.co.za/~tjaart/index.html | >| WGS84 -26.0124 +28.1129 Voice +27 (0)11 2545100 | >|--------------------------------------------------| > >

> >It will work with MPC. (would have worked?) > >I've used some Mchip asy samples with MPC before > Perhaps you should threaten them at gunpoint <G> > But I don't think taht even the bigest stick will help. But one has to ask, > why would you want to mix gold with lead? OK, I get the hint. What is MPC? Will it support 32-bit data types? Anyone got a URL? I'm not sure what the gold and lead question means. To reiterate: I need a C compiler which fully supports 32 bit data types and floating point maths, supports the 17C44, and will either: 1/ assemble MPASM-compatible assembly code 2/ link MPASM-generated object code The reason for the fixation with MPASM is simply that I intend to use their published FFT module. I'm absolutely happy to use a different FFT module - would prefer it, even, if I could get one in C source for the appropriate compiler. Hi-Tech C gets damn close, but it won't assemble much MPASM assembler due to a number of small syntactical and lexical differences. Steve Thackery Suffolk, England. Web Site: http://www.btinternet.com/~stevethack/

Steve Thackery wrote: > > > >It will work with MPC. (would have worked?) > > >I've used some Mchip asy samples with MPC before > > > Perhaps you should threaten them at gunpoint <G> > > But I don't think taht even the bigest stick will help. But one has to > ask, > > why would you want to mix gold with lead? > OK, I get the hint. What is MPC? Will it support 32-bit data types? > Anyone got a URL? Hehehe. http://www.bytecraft.com Ask Walter (.....walterKILLspam.....bytecraft.com) if you get 32-bit support. -- Friendly Regards /"\ \ / Tjaart van der Walt X ASCII RIBBON CAMPAIGN EraseMEtjaartspam_OUTTakeThisOuTcellpt.co.za / \ AGAINST HTML MAIL |--------------------------------------------------| | GSM Technology for Positioning and Telematics | | Cellpoint Systems SA http://www.cellpt.com | | http://www.wasp.co.za/~tjaart/index.html | | WGS84 -26.0124 +28.1129 Voice +27 (0)11 2545100 | |--------------------------------------------------|

>But I don't think taht even the bigest stick will help. But one has to ask, >why would you want to mix gold with lead? It makes the lead go farther before you run out? Andy ================================================================== Andy Kunz Life is what we do to prepare for Eternity ------------------------------------------------------------------ andyspam_OUTrc-hydros.com http://www.rc-hydros.com - Race Boats @spam@andyKILLspammontanadesign.com http://www.montanadesign.com - Electronics ==================================================================