[time-nuts] ARM boards for low-cost GPSDOs

davidh dhooke at gmail.com
Fri Apr 11 11:49:06 UTC 2014

Hi All,

I've used the STM32F4 for a few projects, and was considering it for a 
time tagger for a DMTD system. I have a question about the clocking 
though that someone may be able to help me with.

The 32F4 (like lots of similar ARMs) uses a PLL to generate the internal 
clocks from much lower frequency clock or crystal. Has anyone quantified 
the stability of the synthesised clock?



On 11/04/2014 8:02 AM, Alberto di Bene wrote:
> On 4/10/2014 11:38 PM, Hal Murray wrote:
>> Does anybody have a favorite low-cost ARM board?  I'm looking for a
>> simple
>> Arduino like setup rather than something that runs Linux.  The idea is
>> to get
>> 32 bit counters so a bunch of the recent discussion can be ingnored.
> ==========
> I can't recommend warmly enough the Discovery board from STM.
> It sports a Cortex ARM M4F that can run at 180 MHz, has a native
> IEEE compliant floating point core, 2MB flash and 256 kB RAM,
> and a wealth of interesting peripherals on chip, TFT display touch
> enabled included.  And at 23.52 USD is cheaper than a much
> less powerful Arduino...
> I implemented on it a fully featured SDR, without using any opsys,
> talking directly to the bare metal using the Keil IDE/compiler.
> A joy to use. Look here :
> http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1848/PF259090
> 73  Alberto  I2PHD
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