Same with the pi4j DSL, you can create a pi4j block to execute within a CoroutineScope using the pi4jAsync DSL.
pi4jAsync {
delay(100) // suspended call
describe()
}
Inside pi4jAsync you have access to a newly created auto context and you can run your code in the provided CoroutineScope.
You can also use a custom CoroutineScope instance.
pi4jAsync(CoroutineScope(Dispatchers.Default)) {
delay(100) // suspended call
describe()
}
This is a the same as the minimal example, but leveraging Kotlin’s Coroutines
private const val PIN_BUTTON = 24 // PIN 18 = BCM 24
private const val PIN_LED = 22 // PIN 15 = BCM 22
private var pressCount = 0
pi4jAsync {
console {
digitalInput(PIN_BUTTON) {
id("button")
name("Press button")
pull(PullResistance.PULL_DOWN)
debounce(3000L)
piGpioProvider()
}.onLow {
pressCount++
+"Button was pressed for the ${pressCount}th time"
}
digitalOutput(PIN_LED) {
id("led")
name("LED Flasher")
shutdown(DigitalState.LOW)
initial(DigitalState.LOW)
piGpioProvider()
}.run {
while (pressCount < 5) {
+"LED ${state()}"
toggle()
delay(500L / (pressCount + 1))
}
}
}
}