There is also Raspberry Pi Zero, which is supposed to cost $5.
If you want good battery life you will need to modify David's present
software to be interrupt-driven, to have some sort of hardware squelch that
interrupts when there's a signal to be handled, and to spend most of its
time halted. This is the conventional means of getting battery efficiency.
SM1000 currently busy-loops. This makes it run somewhat hotter and it used
more power than otherwise, but mostly nobody cares. The main economy would
come from hardware squelch.
On Fri, Jan 8, 2016 at 3:56 PM, James Cloos <[email protected]> wrote:
> Given the $9 cost and its battery and audio capabilities , NextThingCo's
> CHIP looks like a useful option for a codec2 transceiver.
>
> >From some simple tests, it looks like c2enc and c2dec would each use
> about fifteen to twenty percent of the cpu when used real-time.
>
> I'm still wating on batteries, so I don't know how much talk time one
> would get per Ah; I should be able to do some tests next week or so.
>
> (I'll have to simulate radio costs by using its 802.11 radio; I don't
> have anything else available.)
>
> By default the T/R/R/S socket has video out on the Sleeve, but a simple
> hardware mod (scrape a tiny trace and add a solder blob nearby) will
> switch the sleeve to Microphone In; doing that would allow the use of
> any T/R/R/S headset. Else one can use a USB headset.
>
> The price point seems like a good fit.
>
> Has anyone else done any c2+chip testing?
>
> -JimC
> --
> James Cloos <[email protected]> OpenPGP: 0x997A9F17ED7DAEA6
>
>
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