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comments below<br>
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<div class="moz-cite-prefix">On 03/09/2018 08:37 AM, Alex Davis via
TriEmbed wrote:<br>
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<blockquote type="cite"
cite="mid:19219EB2-A169-483B-B280-200EDCE14E9A@matrixwide.com">
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Following on my sleep/wake issues with the Feather M0, I have
switched to the Feather 32u4. The 32u4 is less flexible with
regards to external pin change interrupts, so I have kept things
simple and just went with hardware interrupts INT2 and INT3.
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<div class="">I’m using <avr/sleep.h> and have no trouble
waking the micro on external interrupt.</div>
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</div>
<div class="">The problem comes with polling the input used for
the interrupt to detect button presses. I would like to wake on
pin LOW (button tied to ground) and then time how long the
button is pressed down. This way accidental button presses will
be less likely to turn the device on.</div>
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</div>
<div class="">The code looks like this - simplified with LEDs to
show what it is doing vs my actual code:</div>
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</div>
<div class="">
<div class=""> // red LED on until button is pressed</div>
<div class=""> digitalWrite(RED_LED, HIGH);</div>
<div class=""><br class="">
</div>
<div class=""> // spin around until the button is pressed</div>
<div class=""> while (digitalRead(BUTTON_0) == HIGH);</div>
<div class=""><br class="">
</div>
<div class=""> // red LED off</div>
<div class=""> digitalWrite(RED_LED, LOW);</div>
<div class=""> // blue LED on</div>
<div class=""> digitalWrite(BLUE_LED, HIGH);</div>
<div class=""> </div>
<div class=""> // wait a bit to settle bouncing</div>
<div class=""> delay(50);</div>
<div class=""> // start button timer</div>
<div class=""> buttonTime = (unsigned long)millis(); </div>
<div class=""> // see if the button is held down long enough</div>
<div class=""> while (digitalRead(BUTTON_0) == LOW)</div>
<div class=""> {</div>
<div class=""> // if the button is held down LONG_CLICK_MS or
more</div>
<div class=""> if (((unsigned long)millis() - buttonTime)
> LONG_CLICK_MS)</div>
<div class=""> {</div>
<div class=""> digitalWrite(BLUE_LED, LOW);</div>
<div class=""> }</div>
<div class=""> }</div>
<div class=""> digitalWrite(RED_LED, HIGH);</div>
<div class=""><br class="">
</div>
<div class="">This works as expected when it has not woke from
an interrupt on BUTTON_0 (INT2). However, if I wake from INT2
(detaching it as soon as I wake) and run it, it will spin
around forever in the second while loop until the button is
released. It is as though Arduino pin 0 (PD2/INT2) being </div>
</div>
</blockquote>
Wait, this is what the code is supposed to do: loop until the button
is released. Is the bug that the blue LED never gets turned off? I
confess I didn't look at this closely the other day. So the bug is
that the counter in millis isn't incrementing while the pin is held
low?<br>
<br>
-Pete<br>
<br>
<br>
<blockquote type="cite"
cite="mid:19219EB2-A169-483B-B280-200EDCE14E9A@matrixwide.com">
<div class="">
<div class="">high somehow breaks millis(). It is not a case of
millis() alone being broken after waking, as I can use it as a
delay loop right after waking with no issue. I just can not
combine it with polling the PD3 pin.</div>
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</div>
<div class="">My work around for the time being is to wake on
INT2 (pin 0 or PD2) and then look for a long press on pin 1 or
PD3. It requires me to have the second button, though.</div>
<div class=""><br class="">
</div>
<div class="">Interestingly enough, the exact same
<avr/sleep.h> code and millis() loop wake/long button
press detect routine works fine on an ATTINY85 (as used in my
UV meter business card).</div>
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</div>
<div class="">I NEED TO BUY A DEBUGGER!!!</div>
<div class="">
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|\ | (¯ \/ |¯\ |V| |\ ¯|¯ |¯) | \/ | | | |¯\ (¯ /¯ /\
|V|</div>
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|_/ (_ . \_ \/ | |</div>
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