DART-6UL WakeableGPIO: Difference between revisions
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MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01 0x1b0b0 /* WAKE gpio */ | MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01 0x1b0b0 /* WAKE gpio */ | ||
</pre> | </pre> | ||
= Enter memory | = Enter memory retention mode = | ||
<pre> | <pre> | ||
$ echo mem > /sys/power/state | $ echo mem > /sys/power/state | ||
</pre> | </pre> | ||
= Wake up the system = | = Wake up the system = | ||
Connect pins J6.6 and J6,8 with a jumper. It will wake the system up.<br> | Connect pins J6.6 and J6,8 with a jumper. It will wake the system up.<br> | ||
You can also press PWR button to wake up the system. | You can also press PWR button to wake up the system. | ||
Revision as of 13:58, 25 April 2016
In Suspend mode, The power domains of all pins of the SOM are switched off in memory retention mode => All GPIOs lose their state.
The only domain that remains alive is RTC domain (SNVS) and the only pins that still accessible are bank 5 of the GPIO.
The DART-6UL provides 4 external GPIO pins that are a part of bank 5, and can be used for waking the system up and for controlling external peripherals in sleep mode.
In teh below example we will use GPIO5_1 to wake up the system. This pin is exposed on J2.64 of the SOM and on pin J6.6 of the EVK.
Define GPIO as a key pad
Add the following section to the imx6ul-var-dart.dtsi file, right after leds section:
gpio_keys {
compatible = "gpio-keys";
#address-cells = <1>;
#size-cells = <0>;
autorepeat;
button@21 {
label = "GPIO Key UP";
linux,code = <103>;
gpios = <&gpio5 1 1>;
gpio-key,wakeup;
};
};
Add GPIO pad configuration
Add the following section to the imx6ul-var-dart.dtsi file, into pinctrl_hog_1 group:
MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01 0x1b0b0 /* WAKE gpio */
Enter memory retention mode
$ echo mem > /sys/power/state
Wake up the system
Connect pins J6.6 and J6,8 with a jumper. It will wake the system up.
You can also press PWR button to wake up the system.