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bit reverse

I was hoping that there would be some psuedo or example code for the CMSIS generated bit reverse look up tables for the FFTs. I would like to try and extend the FFT to 8k in length. So I am looking at these tables, but can not figure out how they are generated, specifically the tables like armBitRevIndexTable128.

Thanks.

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0 Quinn over 6 years ago in reply to Daniel White

Dan,

Could you expand on the technique used to generate the bit reversal tables? I'm also trying to create an 8K variant as G. Goodwin was looking for previously. The other tables that need expansion have psuedo code which can be used to generate future tables. The bit reversal tables are less defined.

I use arm_rfft_fast_f32 for the eventual calculation.

Thanks!
Quinn
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0 Quinn over 6 years ago in reply to Daniel White

Dan,

Could you expand on the technique used to generate the bit reversal tables? I'm also trying to create an 8K variant as G. Goodwin was looking for previously. The other tables that need expansion have psuedo code which can be used to generate future tables. The bit reversal tables are less defined.

I use arm_rfft_fast_f32 for the eventual calculation.

Thanks!
Quinn
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