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Re: [Xylo-SDR] Firewire, DSP and FPGA on one module
Bob,
another big problem with using C-incapable DSP chips is the fact that
once these are obsolete, it needs to be ported to the new processor.
C67x is a nice part. I use C64x in my day job and have used all the
other 16-bit fixed point TI parts too (I work for TI). If there were
free tools, I would have definitely prefered to use a C67xx part for
PIC-A-STAR, which would have given me more MIPS to do more interesting
stuff and also write everything with C.
Ramakrishnan
On 12/18/05, Robert McGwier <rwmcgwier@comcast.net> wrote:
> The TMS320C6713B DSK comes with free development tools but you need to
> purchase the DSK. I greatly prefer this chip to any of the
> alternatives. You can get it to run at 300 MHz and draw very small
> power. For most SDR applications, you easily run entirely off on chip
> memory. It runs fast in float modes. The DSK, which comes with
> development tools is $450 or so. Lyle, Howard Long (G3LVB), Chuck
> Green (N0ADI), Frank Brickle (AB2KT), and I are working on hardware and
> software using this part at its heart fir AMSAT SDR based transponders.
>
> The drawback to the free development tools with the DSK is that you hope
> you get a bug free version since it does not appear that they upgrade
> the freeware once you have installed.
>
>
> Cheers,
> Bob
>
>
>
> Ramakrishnan Muthukrishnan wrote:
>
> >On 12/18/05, Robert McGwier <rwmcgwier@comcast.net> wrote:
> >
> >
> >>The 16 bit fixed point DSP chip could be an issue which is dependent on
> >>how it is used. Dealing with fixed point is an art few can master. I
> >>..
> >>..
> >>This has 50K. So that is a win plus it has the 18x18 multipliers. All
> >>positives. It is my personal opinion that we are better served at this
> >>time by mostly avoiding the use of DSP chips, especially fixed point
> >>ones and to rely on our ability to speedily process data on our modern
> >>desktops. The SDR-1000 DSP core, written by AB2KT and I, recently was
> >>
> >>
> >
> >Bob,
> >
> >Everything agreed. But for those folks who are interested to see a
> >radio as a radio - packaged in a small box - DSP seem to be the only
> >way out as of now. Also there are some nice TI DSPs out there which
> >draws very less power, like the C55x for instance. If there were a
> >free toolchain available for them, I would have definitely choosen
> >them for a DSP-based SDR instead of the PIC-A-STAR that I am building
> >right now. There are very very powerful devices. If we have the luxury
> >of a powerful development environment like GNU/Linux and a free
> >toolchain which has a community behind it, nothing to beat it.
> >
> >--
> > 73, Ramakrishnan - VU3RDD
> >_______________________________________________
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> >
> >
> >
>
>
> --
> Laziness is the number one inspiration for ingenuity. Guilty as charged!
>
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--
73, Ramakrishnan - VU3RDD