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<p>Thanks for the update, Alex. This is very interesting.</p>
<p>-Pete<br>
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<div class="moz-cite-prefix">On 02/22/2018 09:03 AM, Alex Davis via
TriEmbed wrote:<br>
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I finally got my Adafruit M0 Adalogger board to sleep without
crashing, as well as to get a LIS3DH accelerometer to do both
event interrupt triggering and continuous readout. It’s not a full
success, however, as measuring current draw shows the M0 does not
always go to actual low-power mode. The best I have achieved so
far as about 2mA - that’s pretty poor. Worst case “sleep” was 18
mA.
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<div class="">I’m using the LowPower.h library. Yes, that is
lazy and I should be setting the registers manually etc…</div>
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<div class="">I think also there are some subtleties with
the ATSAMD21 concerning the stack and vectors with interrupts
and sleep. If I keep my sleep/wake within main(), it works
fine, but if I try do it within a function as part of a
switch-case state machine, it fails or appears to run the
wrong code.</div>
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<div class="">I would not recommend the ATSAMD21 for low-power
projects when using Arduino. The Adafruit M0 products in
particular do not have a JTAG interface, so you’re reduced to
using LEDs to try to debug, since sleeping shuts down the USB
serial interface. I think if you want to use the Feather stuff
and want low-power, stick with the 32u4 models.</div>
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<div class="">I put my working and non-working code here on my
github: <a
href="https://github.com/quarterturn/feather-m0-sleep-shake-project"
class="" moz-do-not-send="true">https://github.com/quarterturn/feather-m0-sleep-shake-project</a></div>
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<div class="">I can probably accept a 2mA draw in sleep mode. I
have a 110 mAh battery, and at 2 mA standby and the occasional
15 mA during recording it should last a whole night. I just
have to figure out why the exact same sleep command behaves
differently at times.</div>
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<div class="">Alex<br class="">
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|\ | (¯ \/ |¯\ |V| |\ ¯|¯ |¯) | \/ | | | |¯\ (¯ /¯
/\ |V|</div>
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