[OZAPRS] development strategy- new MODEM

[Glen English VK1XX]

Encoder requirements- minimum -  32 bit microcontroller with at least 
12kRAM, 96kFLASH like cortex M3 >= 20 MHz.

Encoder is frugal...640 col x 512 row parity checks are computed by help 
of Look Up Table.

Decoder requirements linux,alsa,  x86 SSE2 or ARMv7 NEON+VFPv3    (Not 
Pi-A). cache.

any ATOM processor, Edison etc, many thin clients etc,  or ARM cortex at 
least A5. (many !)

decoder CPU load proportional to minimum SNR performance and search 
bandwidth. something like 2000 DMIPS per 2.5kHz search BW for best 
performance. A Cortex A5 is about 1.5 DMIPS/MHz . A15 is ~ 4 DMIPS/MHz.

Odroid C1 @ 1 GHz (4 cores) , Pi C, various rockchips etc anythign 
designed in the last 8 years would be OK. All the MYIR products are good 
like MYS-6ULX-IND  ($25) .single core A7 ~ 1000 DMIPS

Can use maximum 6 cores. (parameterized) .




On 30/12/2017 5:39 PM, Scott Evans wrote:
>
> Certainly interested some of the requirements I've most likely got 
> sitting on the shelf in the radio room!
>
>
> On Sat., 30 Dec. 2017, 17:11 Glen English VK1XX, 
> <glenlist at pacificmedia.com.au <mailto:glenlist at pacificmedia.com.au>> 
> wrote:
>
>     1) beta testers with linux platforms for people that know what
>     "make" is  .
>     x86 and ARMv7 and above. uses ALSA (sorry).
>
>     (now)
>
>     2) encoder code for off the shelf STM32 discovery eval PCBs (10-20$)
>
>     (already works)
>
>     3) encoder code for some PCBs I have that have a micro and a
>     AD9859 DDS
>     for direct output on freq (to 300 MHz)
>
>     (already works)
>
>     4) production encoder PCB using STM32 and all onboard interfaces.
>     ($35)
>
>     5) provision of prebuilt configured small linux encode/ decode
>     platforms
>     (raspberry Pi  , Odroid,  MYS-6ULX-IND)
>     and audio +cpntrol + gps interface PCB for order.
>
>     and in there , : fix up ratty code and interfaces / dire wolf etc
>
>
>
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