LED¶

Description¶

The LED object represents an LED attached to the device. It allows turning on/off or toggling an LED.

This object was introduced in InCore 2.0.

› Inherits:	Object

Overview¶

Properties¶

index
networkInterfaceName
systemName
trigger
value
Object.objectId
Object.parent

Methods¶

Signals¶

Object.completed()

Properties¶

index¶

This property holds the index of the LED which to control through the object instance. If systemName is set, this property is ignored.

› Type:	Index
› Default:	LED.None
› Signal:	indexChanged()
› Attributes:	Writable

networkInterfaceName¶

This property holds the name of the network interface (i.e. NetworkInterface.hardwareName) which to indicate traffic for.

This property was introduced in InCore 2.5.

› Type:	String
› Signal:	networkInterfaceNameChanged()
› Attributes:	Writable

systemName¶

This property holds the system name of the LED (i.e. the name of the corresponding entry in /sys/class/leds/) which to control through the object instance. This property takes precedence over index.

This property was introduced in InCore 2.5.

› Type:	String
› Signal:	systemNameChanged()
› Attributes:	Writable

trigger¶

This property holds a trigger which controls the LED at the system level automatically. See the LED.Trigger enumeration for details.

This property was introduced in InCore 2.5.

› Type:	Trigger
› Default:	LED.NoTrigger
› Signal:	triggerChanged()
› Attributes:	Writable

value¶

This property holds the desired state of the LED.

› Type:	Boolean
› Default:	`false`
› Signal:	valueChanged()
› Attributes:	Writable

Methods¶

toggle()¶

This method toggles the current state of the LED, i.e. inverts the value property.

Enumerations¶

Index¶

This enumeration describes the supported LED indexes.

Name	Value	Description
`LED.None`	`0`	No valid LED configured.
`LED.StatusRed`	`1`	The red status LED.
`LED.StatusGreen`	`2`	The green status LED.
`LED.StatusBlue`	`3`	The blue status LED.

Trigger¶

This enumeration describes the supported triggers for controlling LEDs at the system level. A trigger makes the configured LED flash on certain events or under certain conditions.

This enumeration was introduced in InCore 2.5.

Name	Value	Description
`LED.NoTrigger`	`0`	No trigger configured.
`LED.Heartbeat`	`1`	A trigger indicating a running system as well as the system load.
`LED.StorageAccess`	`2`	A trigger indicating access to the local storage (MMC/NAND).
`LED.NetworkTraffic`	`3`	A trigger indicating traffic at a certain network interface (networkInterfaceName).
`LED.SystemActivity`	`4`	A trigger indicating any kind of CPU usage.

Example¶

import InCore.Foundation 2.5
import InCore.IO 2.5

Application {

    LED {
        id: blueLed
        index: LED.StatusBlue
    }

    // toggle blue LED every 1000 ms
    Timer {
        onTriggered: blueLed.toggle()
    }

    AnalogInput {
        id: ain
        index: AnalogInput.AIN1
        mode: AnalogInput.Mode10V
        Polling on value { }
    }

    // turn on red LED if AIN1 exceeds 5 V
    LED {
        index: LED.StatusRed
        value: ain.value > 2048
    }
}