GoLang: add print and greeting

Author: vshymanskyy

examples_pio/Wasm_Advanced/wasm_apps/tinygo/app.go

@@ -1,5 +1,9 @@
 package main
 
+import (
+  "strconv"
+)
+
 /*
  * Arduino API
  */
@@ -33,6 +37,31 @@ func digitalWrite(pin, value uint)
 //go:export getPinLED
 func getPinLED() uint
 
+//go:wasm-module arduino
+//go:export print
+func print(s string)
+
+//go:wasm-module arduino
+//go:export getGreeting
+func _getGreeting(buf *byte, maxlen uint)
+
+func println(s string) {
+    print(s + "\n")
+}
+
+func getGreeting() string {
+    var buf = make([]byte, 64)
+    _getGreeting(&buf[0], 64)
+    // Find '\0'
+    n := -1
+    for i, b := range buf {
+        if b == 0 {
+            break
+        }
+        n = i
+    }
+    return string(buf[:n+1])
+}
 
 /*
  * App
@@ -42,9 +71,15 @@ var LED = getPinLED()
 
 func setup() {
     pinMode(LED, 1)
+
+    println("TinyGo is running")
+    println("Greeting: " + getGreeting())
 }
 
 func loop() {
+    t := millis()
+    println(strconv.FormatUint(uint64(t), 10))
+
     digitalWrite(LED, HIGH)
     delay(100)
     digitalWrite(LED, LOW)