Faisal,
I've not yet done any work to port 2400A or 2400B to the SM1000 or STM32F4.
The FMFSK modem used by 2400B will probably run without issue, as it
doesn't use a whole lot of memory as is, but I'm not sure about FSK. The
big issue I see for you is that 2400A and 2400B operate at a 48Khz sample
rate instead of the 8Khz rate of 1600 or 7.5/8Khz rate of 700B. You'll also
need to move the 2400A/B initialization outside of the #ifdefs in
freedv_api.c for it to build to the SM1000.
Thanks,
Brady O'Brien
On Thu, Mar 17, 2016 at 2:01 PM, David Rowe <da...@rowetel.com> wrote:
> Hi Faisal,
>
> 1/ You need to change the protocol, bit packing, FEC, number of tones
> etc. There may be CPU load issues. Suggest you start with the Host PC
> version and test there. Get the entire system working fine on a PC
> first, then try porting to the SM1000.
>
> 2/ Edit sm1000_main.c where PTT is pressed? Maybe use a state machine
> to inject a compressed Codec 2 message before taking audio from the
> microphone.
>
> - David
>
> On 17/03/16 22:39, Faisal Saleem wrote:
> >
> > Hi all,
> > I am an engineering student and working on a digital voice project. I
> am impressed by codec2 and sm1000, the freedv adapter. I just got 2 sm1000
> modules and built the firmware sm1000.bin successfully. I connected the two
> sm1000 boards back to back using RIG interface (a cross RJ45 cable). And
> both sm1000 are talking to each other both in analog and DV modes
> (fantastic). While studying the code, I've seen that the codec 2 mode is
> set to 1300. I just changed the codec2 mode to 1600. At 1600 mode the voice
> quality was not very good compared to 1300 mode and also there was a bit
> error (error LED constantly on). When I just set the mode to 2400, receiver
> doesn't receive any thing while transmitter is transmitting. My questions
> are:
> > 1) Is it enough to change the codec mode in freedvapi.c to change the
> codec mode or do I need to change some other parameters like Nc, NB etc to
> run it on 2400 mode without any BER.
> > 2) I want to access the PTT i.e. whenever I press PTT, I want to
> transmit a custom message first before transmitting the actual voice. How I
> can do this?
> >
> > Thanks in advance for your precious help.
> >
> > Regards,
> > Faisal
> >
> >
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