Hi Danny,
I strongly doubt that a STM32F4 will be able to run RTKLIB.
It's true that it runs on a beaglebone, but Cortex-A8 has around
2MIPS/MHz and runs at frequencies close to 1GHz,
whereas a Cortex-M4 has 1.25MIPS/MHz and runs at frequencies up to
150MHz: there is almost one order of magnitude.
In addition since the structure of rtkrcv is quite strongly coupled with
a Linux OS,
there will be a lot of effort required to port it to a lighter RTOS, let
go to bare metal code.
But I don't want to discourage you.. if you think it's doable go for it :)
Best regards,
Michele
On 02/05/2012 00:15, Danny Miller wrote:
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.
Danny
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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