DART-6UL suspend: Difference between revisions
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= Current consumption when suspended = | = Current consumption when suspended = | ||
To measure the current remove resistor R4 and connect ampere meter instead.<br> | To measure the current remove resistor R4 and connect ampere meter instead.<br> | ||
The current consumption should be measured is around 5mA at 3.3V<br> | The current consumption should be measured is around 5mA at 3.3V<br> | ||
Revision as of 17:26, 23 January 2017
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 $ echo mem > /sys/power/state
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 and connect ampere meter instead.
The current consumption should be measured is around 5mA at 3.3V