Post by thread:Urgent FFT help would be much appreciated

Colleagues, Have any of you used Microchip's FFT code in anger? Here's what I've got to do: my colleague and I are working on a product which needs to perform an FFT on a 1024 sample sound-bite. We are using a 17C44. The software is being developed in assembler using MPLAB. Here is my problem: I need to make the FFT module relocatable, so it can be linked with our other code (which is big and complex). The trouble is, there are at least three ORG statements in Microchip's published FFT code, one of which ORG's at 0x000. Simply replacing these with CODE statements makes the linker spit out a list of grumbles as long as my arm, and it looks like it might be horrendously complicated to work out just what we've got to do. The problem is made more difficult by only having a partial understanding of how the code works. So here's the bottom line: have any of you successfully altered Microchip's FFT code to make it relocatable? And have you expanded it to deal with 1024 samples? (currently it does 256). Alternatively, have any of you got alternative FFT code which will assemble and/or link using MPLAB? (It is too late to move the whole project over to another development environment). I'm pretty desperate for help, and any support would be gratefully received. If anyone has a solution "in the bag" - plug-and-go - I might be able to persuade my employer to make a financial contribution. Many thanks in anticipation, Steve Steve Thackery Suffolk, England. Web Site: http://www.btinternet.com/~stevethack/