[FOSS-GPS] RTKLib MIPS requirements?

Danny Miller dannym at austin.rr.com
Tue May 1 18:15:16 EDT 2012

STM32F4 "demo board" uses an Arm Cortex m4.  32 bit, 210 DMIPs and a 
single-precision hardware FPU.  I'm slightly unclear on the memory space 
it has on this specific board but it should be 192KB SRAM and 1MB 
flash.  That's my porting plan.

If it WORKS, it'll be a great system, these boards are absurdly cheap.  
It is several more orders of magnitude of capability than these 8bit 
PICs and such, but I don't understand the scale of the flops requirement 
of RTKLib.  I know it's somewhere between "much more than any 8-bit 
controller could ever do" and "won't even make Intel i7 break into a 
sweat".   And those are wildly different magnitudes.  I don't know 
exactly where RTKLib 10Hz would be between those.

And it's be running RTKLib and just some minor application (navigation 
and monitoring) code which will not be processor-intensive, and it's not 
using Linux or an RTOS.  So there's not a significant overheat for other 
tasks and the overhead's timing can be managed predictably and 
accurately.  Pretty much the core can either do it or it can't.


On 5/1/2012 4:43 PM, julio menezes wrote:
> Hi Danny,
>> I have a core with a hardware FPU, but it's only capable of
>> doing Single floats, not Double.  It is going to break
>> things to implement the specified Double calcs with Single
>> precision?  I would assume so, but it's worth asking.
> The RTKLIB author T.Takasu and A.Yasuda have  ported RTKLIB to a BeagleBoard which has an ARM Cortex-A8- with 1 GHz and floating point, I do not know if double or single precision.
> I plan to move in this direction also, may be using a hardware less powerful but cheaper.
> Raspberry Pi
> http://www.raspberrypi.org/faqs
> The SoC is a Broadcom BCM2835.
> This contains an ARM1176JZFS, with floating point, running at 700Mhz, and a Videocore 4 GPU.
> I am waiting, anxiously,  the RTKLIB 2.4.2 version with RTCM-104 phase messages encoder to built a local base station as where I live there are no near NTRIP network ( less than 10km ).
> good luck,
> julio menezes
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