DART-6UL suspend: Difference between revisions
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{{PageHeader|Suspend to RAM}} | {{PageHeader|Suspend to RAM}} | ||
{{DocImage|category1=Yocto|category2=DART-6UL | {{DocImage|category1=Yocto|category2=Debian}} [[Category:DART-6UL]] | ||
= Suspend to RAM = | = Suspend to RAM = | ||
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<pre> | <pre> | ||
Enable Wi-Fi if not enabled to ensure the firmware is loaded: | Enable Wi-Fi if not enabled to ensure the firmware is loaded: | ||
# ifconfig wlan0 up | |||
Disable Wi-Fi to put it into sleep state: | Disable Wi-Fi to put it into sleep state: | ||
# ifconfig wlan0 down | |||
Disable Bluetooth | Disable Bluetooth | ||
# echo 0 > /sys/class/gpio/gpio132/value | |||
Enter Sleep mode | Enter Sleep mode | ||
# pm-suspend | |||
</pre> | </pre> | ||
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= Current consumption when suspended = | = Current consumption when suspended = | ||
To measure the current remove resistor R4 and connect | To measure the current remove resistor R4 on the 6ULCustomBoard and connect an ammeter instead.<br> | ||
The current consumption should be | The expected measured current consumption should be around 4.5mA at 3.3V<br> | ||
Latest revision as of 19:31, 28 April 2023
Suspend to RAM
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.
NOTE:
The test in this section was performed with LCD display disconnected.
The test in this section was performed with LCD display disconnected.
To suspend to RAM:
Enable Wi-Fi if not enabled to ensure the firmware is loaded: # ifconfig wlan0 up Disable Wi-Fi to put it into sleep state: # ifconfig wlan0 down Disable Bluetooth # echo 0 > /sys/class/gpio/gpio132/value Enter Sleep mode # pm-suspend
Wake up
There are many possible ways to wake up from suspend.
A few examples:
- Pushing the ON/OFF button (when present on the board)
- 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.
The expected measured current consumption should be around 4.5mA at 3.3V