Chris,
Could you ask SmartFusion about Cortex M4F? It should not be a stretch
from what they are presently offering.
Thanks
Bruce
On 4/17/2013 11:00 AM, Chris Testa wrote:
I agree that the lack of FPU means it's a lot harder to support all
the software that would ideally live in a baseband modem. I'm not
clear what the solution is yet, except that the fixed point gmsk modem
could make it into the baseband processor. At this point, my plan is
to offer up this project I've been working on: schematics, source, and
docs as open source. Hopefully, lessons will be learned and some part
of this will be valuable to the community at whole.
The board that I'm manufacturing for Hamvention is a full-duplex
quadrature-bits to RF board with sleep states in mA range (10 bits
resolution). Operating range should be 5MHz to 1000MHz w/ 1MHz
bandwidth, though right now you'll have to change parts on a few
matching networks to optimize signal integrity for a given band.
Based on the CMX991, it fits in a 38mmx57mm "room" at 3.3V. This
could be connected to any processor you want to try.
The baseband processor I'm trying is an ARM Cortex-M3 SoC processor
that has an integrated FPGA called the SmartFusion. This is doing DSP
to/from the quadrature rf transceiver. I think the SmartFusion is a
really interesting hybrid chip that allows for low power sleep modes
and the agility of a reconfigurable radio, with Linux in the package.
In practice, I think the FGPA will end up being a co-processor for
FIR, IIR, FFT just like the functions in the SHARC DSP.
I'm into creating an open project, and both Verilog and ARM C have
cross vendor support. There's ARM SoC FPGA's from Xilinx Zynq, Actel
SmartFusion(2), and very recently Altera Cyclone V. Expect the SDR
manufacturers using FGPA's to come out with radios built on these
chipsets.
I definitely think you could hook up a DSP processor but I'm not sure
which one to try. I'd be interested to see your results.
Chris KD2BMH
On Wed, Apr 17, 2013 at 5:13 AM, Greg Troxel <g...@work.lexort.com
<mailto:g...@work.lexort.com>> wrote:
I know the Elecraft KX3 is not Open Source, but it's interesting
to look
at the CPU choices because it does an amazingly good job at
functionality per dollar and per watt. There's an 18F87K22 and an AMD
floating point DSP (ADSP-21479) and no conventional CPU. It
manages to
receive HF with 200 mA. For a handheld, battery life is going to be a
huge consideration. So if I were going to build something that
was like
an FM handheld and also had DV (and probably a GPS chip and APRS, like
the VX8), I'd avoid SDR and put the codec2 modem in the DSP.
http://www.analog.com/en/processors-dsp/sharc/ADSP-21479/products/product.html
My guess is that once codec2 is on that DSP, and maybe the container
protocol (like D-STAR) replacement, then the PIC can do the rest
of the
UI.
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