Home- gpiohandle = gpio.new(app, callback)
- functioncallback(event) ...
- gpiohandle:close()
SYNOPSIS
DESCRIPTION
Create a new GPIO event handler. The handler is attached to the event processor passed in app.
Events are reported by calling the passed callback function. The parameter event is a table containing fields describing the event.
| type | The event type. This is one of the GPIO_xxx type values from lua/gpio.lh. |
| pin | The pin number where the event happened. |
| group | The pin group where the event happened. This is either one of the predefined GPGRP_xxx values from lua/gpio.lh or a group ID registered with gpio.register(). |
| value | The value associated with the event. |
| rising, falling | For events that report edge counters, these fields contain the counter values. These events do not report a value field. |
The gpio:close() will close the GPIO handler when no longer needed. The handle becomes invalid. This automatically happens during garbage collection, but that takes an unknown amount of time.
RETURN VALUE
Returns a gpio event handler instance.
NOTES
Call gpio.new() only once per application. With more than one event handler, it is
undefined which handler will get the events.