[sdiy] STM32 processor

[MTG]

TI OMAP

GB
www.musictechnologiesgroup.com

----- Original Message ----- 
From: "Eric Brombaugh" <ebrombaugh1 at cox.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, September 15, 2011 11:08 AM
Subject: Re: [sdiy] STM32 processor


> On 09/15/2011 10:41 AM, Olivier Gillet wrote:
>> Has anybody tried to benchmark those (esp. the 72 MHz parts) against
>> dsPICs for audio generation or audio effects? I'm curious to know
>> whether 40 Mhz clock + 16 bits instruction set with DSP features can
>> beat 72 Mhz clock (with wait states from the flash) + generic 32 bits
>> instruction set.
> 
> That was part of the rationale behind my experiment with the 'F100 part 
> - to see how it compares with the dsPICs I've used previously. Although 
> this one is running at just 24MHz compared to the 40MHz that the dsPIC 
> runs (no waits in either), I found that the 32-bit native register 
> operations provided a 'force multiplier' effect that erased some of the 
> difference in cycle speed. The interpolated wavetable oscillator 
> algorithms compare quite favorably running on the two different 
> architectures.
> 
> The dsPIC does have an advantage in providing true DSP capabilities 
> though - zero-overhead looping hardware, dual operand buses with 
> parallel address calculations and true single-cycle MAC instructions 
> that greatly accelerate filters, interpolations, etc. The ARM 
> architecture won't be able to match that without a behind-the-scenes 
> overhaul which even the newer Cortex-M4 series doesn't really provide 
> based on my reading of the documentation.
> 
> Eric
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