Simple audio in-out code for the ADSP-BF706 EZ-KIT

Hello Patrick !

That is I need for my first BF706 project on my own dsp board.

Thank you !

Roman

Hi PatrickG, could you change it to audio in-out block-to-block ,thank you very much!

No problem. I also have the same version in pure assembly code if you are interested.

Ok, I'll work on this!

Hello Patrick,

your program for the BF706 EZ-Kit Lite is very useful, very clear and it works fine!
I have written a DMA and interrupt driven version to avoid polling.
This could be a first step to block in-out. The attached file is also free software.

UweS

Thanks Uwes! I am also writing some code for DMA block in-out. At the moment I am focusing on assembly, since that seems to give the best speed. However, I want to do a comparison between filtering in C and assembly - my C code at the moment gives about 1500 taps for an FIR, but I can get 13000 for an assembly version. Must be doing something wrong.

Hallo Patrick,

my BF706 audio filter program has a bug. The lines

if (*pREG_DMA1_STAT & ENUM_DMA_STAT_IRQDONE)
    *pREG_DMA1_STAT = ENUM_DMA_STAT_IRQDONE;

are missing in the SPORT0_RX_interrupt_handler.

Maybe this is useful for the development of your own DMA interrupt software.

The attached version BF706_Audio_Filter_v2 should be correct.

Best regards

Uwe

OK thanks for this. I shall try this first thing tomorrow!

Hi Patrick,

it seems your program (and my version of it) does not run in
release mode. I guess the delay loops in write_TWI are getting
too short or are removed completely by the compiler in release mode.
The attached version Audio_Filter_v3 has new delay loops.
Debug mode could also explain the poor results for the FIR filters in C.

Regards

Uwe

Hi UweS,

Yes, I forgot to mention that CCES in debug mode automatically sets the PLL clocks to maximum (not mentioned in the literature). The FIR code that I wrote (in assembly), which could handle over 8000 32-bit coefficients (around 13500 for 16-bit) would not work from boot up. Once I had set the clocks explicitly in the code, it worked fine. Here is the code to max the speed:

// Set the clocks to maximum

R1=0X2000;                

[REG_CGU0_CTL]=R1;

R1=0X42042442;

[REG_CGU0_DIV]=R1;