View source for DART-6UL suspend

{{PageHeader|Suspend to RAM}}
{{DocImage|category1=Yocto|category2=DART-6UL}}
= Suspend to RAM =

This state offers significant power savings as everything in the system is put into a low-power state, except for memory, which is placed into the self-refresh mode to retain its contents.<br>
{{note| NOTE:<br>The test in this section was performed with LCD display disconnected.|info}}

To suspend to RAM:
<pre>
# pm-suspend
</pre>

= Wake up =
There are many possible ways to wake up from suspend.<br>
A few examples:<br>
- Pushing the ON/OFF button (when present on the board)<br>
- Pushing a button on the board which has the boolean property "gpio-key,wakeup" set in its device tree node (under gpio_keys), e.g.:

 	gpio-keys {
 		compatible = "gpio-keys";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_gpio_keys>;
 
 		back {
 			label = "Back";
 			gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
 			linux,code = <KEY_BACK>;
 			'''gpio-key,wakeup''';
 		};
 	};

= Current consumption when suspended =
To measure the current remove resistor R4 on the 6ULCustomBoard and connect an ammeter instead.<br>
The expected measured current consumption should be around 4.5mA at 3.3V<br>