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A DLN adapter generates the DLN_GPIO_EVENT_LEVEL_LOW events each time the level on the input pin drops.


Use the DlnGpioPinSetEventCfg()function to configure events. Pass DLN_GPIO_EVENT_LEVEL_LOW for the eventType parameter.

If the eventPeriod is zero, the DLN adapter generates single events when the level on the input pin drops (after transition from high to low level).

If the eventPeriod is non-zero, the DLN adapter resents events periodically with the eventPeriod interval while the level is low.

DLN_GPIO_EVENT_LEVEL_LOW events with period

A series of events begins when the level on the GPIO line drops. At this moment, the DLN adapter sends the first event in the series. The eventCount field of the first event is set to zero and the value field contains 0 to reflect the actual value on the GPIO line. Then, while the level on the GPIO line remains low, the DLN adapter repeatedly sends events. The value in the value field stays the same. The eventCount field increments for every new event. The interval between recurring events is equal to eventPeriod milliseconds. You can calculate the time passed from the last level lowering (time = eventCount * eventPeriod).

When the level on the GPIO line rises, the series of events ends. When the level on the line drops again, a new series of events begins. The eventCount field is reset to zero.

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