| FFT routines Kategorie: Programmierung Assembler (von PepeV - 26.02.2013 21:50) | ||
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Hi all, Attached are some FFT routines in assembler, adapted from the work of ChaN. Any suggestions for improvement are welcome. The routines: 1. perform a wave capturing (a series of AD conversions in Free Running Mode) 2. execute 'butterfly operations' 3. calculate the frequency spectrum I have tested them on my Pro-Bot128 and plan to use them for sound control, in stead of the much slower routines in cc I used until now. Some figures with results are included in the attached zip file too. Torsten, you were right twice: - I needed access to flash in assembler for the sin/cos and other tables. Since this is not possible directly, I now copy these to ram before use. (For this reason I cannot process more than 256 samples, helas!) - I need to disable the global interrupt. But to my great surprise, not only in the ADC capture but in all routines. If I do not do that, I end up with garbage results. Peter: can you explain why interrupts mess up my routines? Is it that interrupts trigger actions that change registers while my routines are running? Is it the Y- register? Regards, Pepe FFT.zip | ||
Antwort schreiben Antworten:  Re: FFT routines (von Torsten - 28.02.2013 19:51)Re: FFT routines (von PepeV - 19.03.2013 13:47)Re: FFT routines (von PeterS - 28.02.2013 14:46)Re: FFT routines (von PepeV - 28.02.2013 15:41)Re: FFT routines (von PeterS - 28.02.2013 17:28)Re: FFT routines (von PepeV - 28.02.2013 21:26) | ||
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