Playing around with https://play.tinygo.org

tinygo-morse.go

package main

import (
	"machine"
	"time"
)

const pattern = "... ––– ..."
const interval = time.Second / 3

func space() {
	led.Low()
	time.Sleep(interval)
}

func dot() {
	led.High()
	time.Sleep(interval)
	led.Low()
	time.Sleep(interval)

}

func dash() {
	led.High()
	time.Sleep(interval * 3)
	led.Low()
	time.Sleep(interval)
}

var (
	// Patrick approves
	signals = map[rune]func(){
		' ': space,
		'.': dot,
		'-': dash,
		'–': dash,
	}
)

const led = machine.LED

func main() {
	println("Hello, TinyGo")
	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
	for _, v := range pattern {
		println(string(v))
		signals[v]()
	}
	led.Low()
	time.Sleep(interval)
}