[time-nuts] precision timing pulse
hmurray at megapathdsl.net
Wed Nov 16 16:03:42 EST 2016
chris at chriscaudle.org said:
> but once you get to most of the ARM processors it is harder to make them
> deterministic because of caches.
There are many ARM SOC chips that are half way between an Arduino and a
Raspberry Pi. They have GPIO and various serial ports and counter/timers.
They don't have USB, Ethernet, or a display controller. They do have on-chip
RAM and Flash.
The ones I worked with didn't have a cache. The on-chip SRAM was good enough.
They typically came with 3 sizes of on-chip memory, growing by a factor of 2
each step. So you get things like
16K RAM, 64K Flash
32K RAM, 128K Flash
64K RAM, 256K Flash
That was 5-10 years ago, so things have probably changed. I'd be surprised
if something similar wasn't available today. I haven't looked for eBay style
low cost boards.
These are my opinions. I hate spam.
More information about the time-nuts