init

wayland/sgp40-air-quality-sensor/init

Initialize SGP40 device.
init
@/init
Initialize SGP40 device.
DEV@/sgp40-device
An SGP40 device.
I2Cxod/i2c/i2c
I²C bus
INITpulse
Initialize.
init
DEV
I2C
INIT
OK
OKpulse
Pulse on initialization.
To use the node in your project you should have the wayland/sgp40-air-quality-sensor library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.

C++ implementation

#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_INIT

node {

    void evaluate(Context ctx) {
        // The node responds only if there is an input pulse
        if (!isInputDirty<input_INIT>(ctx))
            return;

        auto sensor = getValue<input_DEV>(ctx);
        auto wire = getValue<input_I2C>(ctx);

        // Attempt to initialize sgp40 module; if attempt fails emit error
        if (!sensor->begin(wire)) {
            raiseError(ctx);
            return;
        }

        emitValue<output_OK>(ctx, 1);

    }
}