// What is used by a function call?

#include "mem_syms.h"
// remove initialization and location changes from 0x200 to 0x212

// format for printing addresses, sometimes HEX, sometimes DEC
#define ADDR DEC
#define PRINT_ADDR(x) Serial.println( (int) x, ADDR)

char* stack_before;
char* stack_after;
int stack_used_by_call;

void fn() {
  int x = 42;
  stack_after = STACK_TOP;
  // do something
  Serial.print("fn ");
  Serial.println(x, DEC);
}

void setup() {
  Serial.begin(9600);
    
  Serial.println("MEM06");

  Serial.println("Stack bot, top, size");
  Serial.println( (int) STACK_BOTTOM, ADDR);
  Serial.println( (int) STACK_TOP, ADDR);
  Serial.println( (int) STACK_SIZE, ADDR);
  
  stack_before = STACK_TOP;
  fn();
  
 
  stack_used_by_call = (int) stack_before - (int) stack_after;
 
  Serial.print("Stack used ");
  Serial.println(stack_used_by_call, ADDR); 
  
  Serial.println("Stack bot, top, size");
  Serial.println( (int) STACK_BOTTOM, ADDR);
  Serial.println( (int) STACK_TOP, ADDR);
  Serial.println( (int) STACK_SIZE, ADDR);
  
 }

void loop() {
}