I've blogged on a FreeDV 1600 modem bug I just found and fixed. It
discusses sample clock offset problems and has worked examples of how I
develop and integrate the modem code with FreeDV:
http://www.rowetel.com/?p=6041
- David
On 05/05/18 04:51, David Rowe wrote:
Hi Danilo,
700D might need some refactoring to run on a small machine, in
particular the LDPC codec uses some large arrays and doubles.
For example one "modem frame" is 119 complex QPSK symbols (119 * 2
values/complex symbol * 4 bytes/float * 2 bits/symbol = about 2kbyte
soft decisions values per frame). A 16 frame interleaver will need
arrays of 2kbyte x 16. Although the interleaving can be limited if
necessary, I haven't settled on a fixed value for it.
The OFDM modem port should be straight forward, and after a little
optimisation perhaps use less memory and CPU than the FDMDV modem used
for 1600.
Codec 2 700C will also need to be ported.
I can give you some tips on refactoring for small machines and porting
700D if you are interested on working on this.
Cheers,
David
On 04/05/18 22:02, Danilo Beuche wrote:
Hi,
we'll shortly be able to test how a CORTEX-M7 single core architecture
holds up against 700D performance demands in the UHSDR firmware
(STM32F7@216 MHz and STM32H7@400Mhz). And for sake of completeness, we
can test it with a STM32F4 @ 168 Mhz but I don't have high hopes here...
For the 800 Mhz for the A4-5000, I think this is current frequency when
running the cpuinfo command, not necessarily the frequency when the
processor is doing 700D (unless the command was called at the right
time). A4-5000 ha 1.5Ghz max clock.
Regards,
Danilo
model : 0
model name : AMD A4-5000 APU with Radeon(TM) HD Graphics
stepping : 1
microcode : 0x700010b
cpu MHz : 800.000
cache size : 2048 KB
fpu : yes
fpu_exception : yes
bogomips : 2994.54
top - 18:32:54 up 115 days, 4:43, 4 users, load average: 1.46,
1.13, 0.70
Tasks: 291 total, 3 running, 288 sleeping, 0 stopped, 0 zombie
%Cpu(s): 31.8 us, 4.2 sy, 0.0 ni, 63.9 id, 0.0 wa, 0.0 hi, 0.1
si, 0.0
st
KiB Mem : 7592440 total, 205480 free, 1813748 used, 5573212
buff/cache
KiB Swap: 8191996 total, 6313456 free, 1878540 used. 5352648
avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
28410 alanb 20 0 1205880 56316 38656 R 96.4 0.7 5:33.78
freedv
11081 alanb 20 0 368284 43696 27040 S 14.9 0.6 282:15.78 Xorg
This should be indicative of a modern laptop.
Keep smiling
Alan VK2ZIW
On Fri, 4 May 2018 14:55:21 +0930, David Rowe wrote
No need for alarm .... it's consistent with previous versions of
FreeDV GUI that people have been running since 2012.
Optimisation of the DSP code won't help, as it doesn't appear to be
in the modem/codec/FEC, e.g. running the FreeDV stack from the
command line over 60 second samples:
$ time ./freedv_rx 1600 ~/Desktop/ve9qrp_1600_8010.raw /dev/null
real 0m0.748s
$ time ./freedv_rx 700D ~/Desktop/ve9qrp_700d.wav /dev/null
real 0m0.766s
Perhaps 1% CPU.
It's most likely in the GUI code. If anyone would like to take a
look at this, I'd be interested in the results of profiling and will
happily accept patches to reduce CPU. This is a job anyone with
general C/C++ coding experience could do - you don't need to
understand the DSP.
- David
On 04/05/18 12:51, glen english wrote:
or rather either that's alot of CPU or the cache is thrashing
Is it using SSD / NEON vector instructions ?
On 4/05/2018 1:11 PM, Steve wrote:
The lights aren't dimming in the office, the UPS isn't beeping, and
crows aren't falling from the sky :-)
On Thu, May 3, 2018 at 10:07 PM, glen english <g...@cortexrf.com.au
<mailto:g...@cortexrf.com.au>> wrote:
How many watts is that taking?
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