led command

Synopsis

led <led_label> <on|off|toggle>
led <led_label> blink <blink-freq in ms>
led <led_label>
led list

led <led_label>

Get state of the LED whose label is the one passed as <led_label> argument.

Provided <led_label> is module_led, the possible outputs for this command are:

LED 'module_led': off
LED 'module_led': on
LED 'module_led': blink

led <led_label> on|off|toggle

Turn on, off or toggle state of the LED whose label is the one passed as <led_label> argument.

led <led_label> blink <blink-freq in ms>

Make the LED whose label is the one passed as <led_label> argument blink at a frequency specified by the argument <blink-freq in ms>.

The frequency is parsed as a decimal number and its unit is milliseconds. The duty cycle is 50%. Example:

led blue blink 1000

will make the blue-labeled LED blink with a state (on or off) kept for 500ms before switching to the other state (respectively off or on) for 500ms, looping endlessly.

led list

List all available LEDs by their label and provide their known state, which can be either off, on or blink.

If a LED has not been probed yet, its state will be shown as <inactive> in the list.

Examples

=> led list
module_led      on
sd_card_led     <inactive>
=> led module_led
LED 'module_led': on
=> led module_led off
=> led module_led
LED 'module_led': off
=> led module_led toggle
=> led module_led
LED 'module_led': on
=> led module_led toggle
=> led module_led
LED 'module_led': off
=> led module_led blink 1000
=> led module_led
LED 'module_led': blink
=> led sd_card_led
LED 'sd_card_led': off
=> led list
module_led      blink
sd_card_led     off

Configuration

The led commands are only available if CONFIG_CMD_LED=y.

The led <led_label> blink command is only available if CONFIG_CMD_LED=y and either CONFIG_LED_BLINK=y or CONFIG_LED_SW_BLINK=y.