On 10/12/15 14:45, gareth wrote:
Of those _REAL_ radio amateurs who are taking up the excellent
opportunities
for homebrewing in the field of computer programming, I wonder how many are
doing it
in ARM assembler?

And of those, how many are doing it from the ground up, with no supporting
OS?

Yes. On the Beaglebone Blacks PRUSS. Real Time as well. See

https://www.febo.com/pipermail/time-...st/086396.html
and
http://hal.g7iii.net/bb_tic/

Linux is used to load the code to the onboard PRU, and further
processing of the data only, the actual Time Interval Counting is
purely in assembler.

Similar code has also been used to make a mains clock. Further code
to discipline a clock from an RF time/frequency standard will be
forthcoming once the HP3586 Selective Level Meter (Highly sensitive
HF receiver) is installed in the shack.


73s

Iain