#include<stdio.h>
#include<stdlib.h>

void myprint(char* fnName, unsigned int result);

extern "C"{
  unsigned int my_ass_fn(void);
}

void setup(){
  Serial1.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop(){

  unsigned int ass_ret_val;

  ass_ret_val = my_ass_fn();
  myPrint("my_ass_fn()", ass_ret_val);

  digitalWrite(LED_BUILTIN, HIGH);
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);
  delay(1000);

}
void myPrint(char* fnName, unsigned int printVal) {
   Serial1.print("The value returned from the assembly fn ");
   Serial1.print(fnName);
   Serial1.print(":");
   Serial1.print(printVal);
}