Alan - I missed your reply: sorry. I will take a look!
On 11/10/2025 19:07, Alan C. Assis wrote:
Hi Tim,
There is also a presentation on YouTube from a company here in Brazil that
developed a datalog for mining tailings dams:
https://www.youtube.com/watch?v=oo6ckvjXoxQ&list=PLd73yQk5Fd8JlsCoUYGyAf7W63BekgPup&index=13
In the past some accidents happened because some of these dams broke and
destroyed small cities killing many people.
Now they are detecting dams leaking very early and avoiding these kinds of
accidents.
BR,
Alan
On Sat, Oct 11, 2025 at 1:04 PM Tim Hardisty <[email protected]>
wrote:
Thank Gregory.
It looks like very few NuttX-supported processor architectures have any
power modes implemented, but looks like maybe one or 2, plus many others
with "not yet implemented" comments (now I know what to look for).
I will have a look at what is included in builds when CONFIG_PM is
enabled, and try and find some "hooks" that give me clues as to how to
add code to the SAMA5D2 arch code.
On 11/10/2025 13:25, Gregory Nutt wrote:
The are no and special arch/board drivers. There could be, of course,
but they are not required by the PM subsystem.
Low-power mode is done via the PM subsystem and the regular drivers. It
is a subscibe/notify design. Each regular driver registers for PM call
backs and/or generates PM notifications. The relevant calls are prototyped
in include/nuttx/power/pm.h.
The high level, coordinating logic is in drivers/power/pm.
Example usage is in architectures whose drivers call pm_register().
That sets up the driver to receive PM event notifications.
Some older references:
https://cwiki.apache.org/confluence/display/NUTTX/Power+Management+-+Final+Report
https://cwiki.apache.org/confluence/display/NUTTX/Porting+Guide#pwrmgmt
And probably others in the old Wiki (that predate Apache NuttX).
________________________________
From: Tim Hardisty <[email protected]>
Sent: Saturday, October 11, 2025 3:00 AM
To: [email protected] <[email protected]>
Subject: low power mode drivers?
Hello all.
I want to put a SAMA5D2 processor into low power modes via a software
function call. I have found some Microchip App Notes but they either
refer to Linux or have pseudo code for bare-metal, but I sort of
understand what the functions will need to do.
Can someone point me to where in NuttX such arch/board drivers should
live and/or the methodology/template/whatever to use? Then I can find a
board or arch I can use as a reference.
Probably staring me in the face but can't see anything appropriate as
yet!
Thanks!
