Hi Bruce, thanks for your reply. > Hardware floating point is required. So, your low-power CPU might not be the right choice - I think only the ones with "F" in the part number have hardware floating point.
STM32L series are, as I understand it, an extension of the F series in that they also have FPUs, though the clocks are lower to conserve energy. > And don't ask anyone to rewrite the code for fixed-point unless you have a lot of money :-) It would be an experiment I would undertake myself, I'm not expecting anyone to work on my behalf for free ;-) > Since OpenRTX has been getting Codec2 and M17 to work in several commercial HTs, including TYT MD-UV380 and Yaesu FT2D, and this work is scalable to similar HTs from several different brands, your time might be better spent in helping that effort. I'll look into the OpenRTX project, I had not heard of it so thank you. Though, that may be tangential to the goals of our project, which is to build some hardware and firmware for our own radios. Cheers, Josh. On May 14, 2021, Bruce Perens <br...@perens.com> wrote: > Hardware floating point is required. So, your low-power CPU might not > be the right choice - I think only the ones with "F" in the part > number have hardware floating point. And don't ask anyone to rewrite > the code for fixed-point unless you have a lot of money :-) > > Since OpenRTX has been getting Codec2 and M17 to work in several > commercial HTs, including TYT MD-UV380 and Yaesu FT2D, and this work > is scalable to similar HTs from several different brands, your time > might be better spent in helping that effort. > See <https://github.com/OpenRTX/OpenRTX> > and <https://m17project.org/> > > Thanks > > Bruce > On Thu, May 13, 2021 at 3:24 PM Josh Lloyd via Freetel-codec2 > <freetel-codec2@lists.sourceforge.net <mailto:freetel- > cod...@lists.sourceforge.net>> wrote: > Hi David & freetel-codec2, > > Firstly I would like to express a great appreciation for Codec 2, it's > excellent to see an open-source codec in this low bitrate space! > > I have a question about the performance of the algorithm on embedded > hardware. A collection of friends from the local amateur radio club > have got together to try build a digital radio hand-held, essentially > a walkie-talkie. This is to strengthen our understanding of digital > radio, and to practice our electronics engineering. > > I came across your algorithm when looking for free open-source codecs > that could be used with a low bitrate, and I noticed that you already > had this working on the SM1000 which runs an STM32F4. I understand > that the CPU is also computing the baseband for TX and RX, so there is > some spare headroom outside of the codec. My question is how much > headroom is available, and what clock rate do you run the SM1000 at to > get the necessary performance? > > The team and I were postulating using an STM32L4 for our radio since > it offers some very low power modes which are ideal for a battery > powered device, but I am concerned that the 48MHz clock will be > insufficient to run Codec 2. I intend to have a separate controller > handle the packet radio, so that chore is lifted off the main > processor. > > Can you provide any insight into how Codec 2 currently performs and at > which clock rate does it fail timing? Further, is there any reason to > suspect that using fixed point or integer multiplication may increase > the performance? > > Thanks again to all those involved with Codec 2; and for your work on > the thesis before it David, as well as the talks you've provided to > the wider community. > > Kind regards, > Josh > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net <mailto:Freetel- > cod...@lists.sourceforge.net> > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > -- > Bruce Perens K6BP- Board Partner, OSS Capital LLC Venture Capital- > CEO, undisclosed startup
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