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cpu/sam0_common: implement pm_off()#14999

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crasbe merged 1 commit intoRIOT-OS:masterfrom
benpicco:cpu/sam0_common-pm_off
Jun 20, 2025
Merged

cpu/sam0_common: implement pm_off()#14999
crasbe merged 1 commit intoRIOT-OS:masterfrom
benpicco:cpu/sam0_common-pm_off

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@benpicco benpicco commented Sep 10, 2020 •
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Contribution description

Use the OFF mode instead of whatever lowest standby / hibernate mode was provided my pm_set()

Testing procedure

pm off should turn off the CPU.

You can verify this in tests/periph/gpio:

init_out 1 5
set 1 5
pm off

master

PB05 will stay HIGH

this PR

PB05 will become floating / LOW

Issues/PRs references

@benpicco benpicco added Area: cpu Area: CPU/MCU ports Type: enhancement The issue suggests enhanceable parts / The PR enhances parts of the codebase / documentation labels Sep 10, 2020
@dylad dylad self-assigned this Sep 10, 2020
@dylad dylad added this to the Release 2020.10 milestone Sep 10, 2020
@benpicco benpicco added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Sep 10, 2020
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dylad commented Sep 10, 2020

Overall looks good. SAMD21 is still the black sheep of SAM0 family but that's the life.
I'll run some tests later.

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dylad commented Sep 16, 2020

I have a good one for you:
SAME54 MCU power consumption in master with pm_off() -> 0.15 mA
SAME54 MCU power consumption with your PR and pm_off() -> 0.50 mA

SAML11 and SAML21 looks good so far.

aabadie
aabadie reviewed Sep 25, 2020
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benpicco commented Sep 25, 2020

@dylad I don't have saml10 or sam21 to measure right now - did you see an improvement there?
If so, I'll just add pm_off() to their respective pm.c implementations.

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dylad commented Sep 25, 2020

I don't have saml10 or sam21 to measure right now - did you see an improvement there?

When I did these measurements, I did not see any regression for these families (unlike SAME54) but my amperemeter is not accurate enough to see improvement on a few uA.

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dylad commented Sep 25, 2020

My only issue right now is with SAME54 family for this PR.

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benpicco commented Nov 14, 2020

The thing is, if this is no improvement over the status quo, I don't see why we should have it.
I'll try to measure for different sam0 boards if it makes a difference anywhere when I'm at the office again.

@benpicco benpicco added State: WIP State: The PR is still work-in-progress and its code is not in its final presentable form yet and removed CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR labels Dec 7, 2020
@benpicco benpicco removed this from the Release 2021.04 milestone Feb 25, 2021
@MrKevinWeiss MrKevinWeiss added this to the Release 2021.07 milestone Jun 21, 2021
@MrKevinWeiss MrKevinWeiss removed this from the Release 2021.07 milestone Jul 15, 2021
@benpicco benpicco force-pushed the cpu/sam0_common-pm_off branch from aebecac to 1d1f9d5 Compare November 29, 2021 13:56
@github-actions github-actions bot added the Platform: ARM Platform: This PR/issue effects ARM-based platforms label Nov 29, 2021
@benpicco benpicco added State: stale State: The issue / PR has no activity for >185 days and removed State: WIP State: The PR is still work-in-progress and its code is not in its final presentable form yet labels Nov 29, 2021
@stale stale bot removed the State: stale State: The issue / PR has no activity for >185 days label Nov 29, 2021
@benpicco benpicco added the State: stale State: The issue / PR has no activity for >185 days label Nov 29, 2021
@stale stale bot closed this Mar 2, 2022
@benpicco benpicco reopened this Jun 19, 2025
@stale stale bot removed the State: stale State: The issue / PR has no activity for >185 days label Jun 19, 2025
@benpicco benpicco added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Jun 19, 2025
@benpicco benpicco force-pushed the cpu/sam0_common-pm_off branch from 1d1f9d5 to 3a52bc6 Compare June 19, 2025 13:03
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benpicco commented Jun 19, 2025

I'm restoring this because there is an important difference between OFF mode and what we currently have: OFF mode will cut the output of all pins.

@benpicco benpicco requested a review from HendrikVE June 19, 2025 13:59
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riot-ci commented Jun 19, 2025 •
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Murdock results

✔️ PASSED

fea0e0f cpu/sam0_common: implement pm_off()

Success Failures Total Runtime
10379 0 10379 13m:28s

Artifacts

HendrikVE
HendrikVE reviewed Jun 19, 2025
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cpu/sam0_common/periph/pm.c
PM->SLEEPCFG.bit.SLEEPMODE = PM_SLEEPCFG_SLEEPMODE_OFF;
while (PM->SLEEPCFG.bit.SLEEPMODE != PM_SLEEPCFG_SLEEPMODE_OFF) {}

cortexm_sleep(1);
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@HendrikVE HendrikVE Jun 19, 2025

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Shouldn't we call sam0_cortexm_sleep instead like we do in pm_set()?

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Nah, this turns off everything with no way to wake up again, so no need to switch clocks are configure GPIOs.

@benpicco benpicco force-pushed the cpu/sam0_common-pm_off branch from 3a52bc6 to 6a7bcea Compare June 19, 2025 15:17
HendrikVE
HendrikVE approved these changes Jun 19, 2025
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I can confirm that the GPIOs turn off with this power mode.

crasbe
crasbe reviewed Jun 19, 2025
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crasbe
crasbe approved these changes Jun 20, 2025
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I don't have the hardware to test this, but if you and HendrikVE tested it successfully, that is sufficient for me.

You can squash the changes directly.

@benpicco benpicco force-pushed the cpu/sam0_common-pm_off branch from 2f4dba2 to fea0e0f Compare June 20, 2025 13:33
@crasbe crasbe added this pull request to the merge queue Jun 20, 2025
Merged via the queue into RIOT-OS:master with commit 3d7b5b0 Jun 20, 2025
25 checks passed
@benpicco benpicco deleted the cpu/sam0_common-pm_off branch June 23, 2025 08:58
@Teufelchen1 Teufelchen1 added this to the Release 2025.07 milestone Jul 14, 2025
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@aabadie aabadie aabadie left review comments

@crasbe crasbe crasbe approved these changes

@dylad dylad Awaiting requested review from dylad dylad is a code owner

@kaspar030 kaspar030 Awaiting requested review from kaspar030 kaspar030 is a code owner

@keestux keestux Awaiting requested review from keestux keestux is a code owner

@roberthartung roberthartung Awaiting requested review from roberthartung

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@HendrikVE HendrikVE HendrikVE approved these changes

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Area: cpu Area: CPU/MCU ports CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Platform: ARM Platform: This PR/issue effects ARM-based platforms Type: enhancement The issue suggests enhanceable parts / The PR enhances parts of the codebase / documentation

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9 participants

@benpicco @dylad @riot-ci @aabadie @crasbe @HendrikVE @jia200x @Teufelchen1 @MrKevinWeiss