Add goroutines and function pointers

src/examples/blinky/blinky.go

@@ -7,15 +7,34 @@ import (
 )
 
 func main() {
-	led := machine.GPIO{17} // LED 1 on the PCA10040
+	go led1()
+	led2()
+}
+
+func led1() {
+	led := machine.GPIO{machine.LED}
 	led.Configure(machine.GPIOConfig{Mode: machine.GPIO_OUTPUT})
 	for {
-		println("LED on")
-		led.Set(false)
-		runtime.Sleep(runtime.Millisecond * 500)
+		println("+")
+		led.Low()
+		runtime.Sleep(runtime.Millisecond * 1000)
 
-		println("LED off")
-		led.Set(true)
-		runtime.Sleep(runtime.Millisecond * 500)
+		println("-")
+		led.High()
+		runtime.Sleep(runtime.Millisecond * 1000)
+	}
+}
+
+func led2() {
+	led := machine.GPIO{machine.LED2}
+	led.Configure(machine.GPIOConfig{Mode: machine.GPIO_OUTPUT})
+	for {
+		println("  +")
+		led.Low()
+		runtime.Sleep(runtime.Millisecond * 420)
+
+		println("  -")
+		led.High()
+		runtime.Sleep(runtime.Millisecond * 420)
 	}
 }

src/examples/hello/hello.go

@@ -25,6 +25,16 @@ func main() {
 	printItf(5)
 	printItf(byte('x'))
 	printItf("foo")
+
+	runFunc(hello) // must be indirect to avoid obvious inlining
+}
+
+func runFunc(f func()) {
+	f()
+}
+
+func hello() {
+	println("hello from function pointer!")
 }
 
 func strlen(s string) int {