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
eventPeriod is zero, the DLN adapter generates single events when the level on the input pin drops (after transition from high to low level).
eventPeriod is non-zero, the DLN adapter resents events periodically with the
eventPeriod interval while the level is low.
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.