pinprobe-item.rst

PinProbe Item

Inherits

:qmlComponent

Enumerations

:cppPullMode, :cppType, :cppValue

Properties

:cppioid, :cppport, :cpppullMode, :cpptype, :cppvalue

Detailed Description

A PinProbe component represents an IO pin on the launchpad probe board. It can be used to physically interface Qst to a Device Under Test (DUT) and stimulate/analyse digital hardware signals.

Each PinProbe item can be configured either as input or output. Additional pull-up or pull-down resistors may be activated for inputs. The output state is set by writing to the output property and events on the probe wire can be observed by attaching a signal handler to the valueChanged() signal.

Example:

import qst 1.0

// Assuming a DUT with an LED and a button and two wires of a
// launchpad probe board attached.
// On a falling edge of the button IO, the LED shall be turned on.
Testcase {
    name: "test-app"

    property string port: "ttyACM3"

    PinProbe {
        id: button
        port: test.port
        type: PinProbe.Write
        value: PinProbe.High
    }

    PinProbe {
        id: led
        port: test.port
        type: PinProbe.Read

        onValueChanged: {
            Qst.info("The LED value is now " + led.value);
        }
    }

    function run() {
        Qst.wait(50);
        Qst.compare(led.value, PinProbe.Low, "LED should be off but is on");
        // Stimulate button press
        button.value = PinProbe.Low;
        Qst.wait(5);
        Qst.compare(led.value, PinProbe.High, "LED should be on but is off");
    }
}

PinProbe currently only emits the :cppvalueChanged() signal. All other properties are assumed to be constant during application life time.

Enumerations

Properties