Due RAM Usage

Official Hardware Mega Due
1

When doing a compile with an AVR-based Arduino, an estimated RAM usage is displayed. This doesn't happen when doing Due compiles. Is there an easy way to gauge RAM usage?

Regards,
Ray L.

2

Some code I've picked up from somewhere and previously tried ... not sure how accurate it is though:

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

extern char _end;
extern "C" char *sbrk(int i);
char *ramstart = (char *)0x20070000;
char *ramend = (char *)0x20088000;

void setup()
{
  Serial.begin(115200);
  while (!Serial);
  char *heapend = sbrk(0);
  register char * stack_ptr asm ("sp");
  struct mallinfo mi = mallinfo();
  printf("\nDynamic ram used: %d\n", mi.uordblks);
  printf("Program static ram used %d\n", &_end - ramstart);
  printf("Stack ram used %d\n", ramend - stack_ptr);
  printf("My guess at free mem: %d\n\n", stack_ptr - heapend + mi.fordblks);

  int* ptr_i;
  int i = 0xaa;
  ptr_i = &i;

  printf("Size of int: %d, Size of uint: %d\n", sizeof(int), sizeof(unsigned int));
  printf("Size of char: %d, Size of uchar: %d\n", sizeof(char), sizeof(unsigned char));
  printf("Size of short: %d, Size of ushort: %d\n", sizeof(short), sizeof(unsigned short));
  printf("Size of float: %d, Size of double: %d\n", sizeof(float), sizeof(double));
  printf("Size of long: %d, Size of longlong: %d\n", sizeof(long), sizeof(long long));
  printf("Size of pointer (ptr_i): %d\n", sizeof(ptr_i));
  printf("Addr of pointer (ptr_i): 0x%x\n", ptr_i);
  printf("Value of i: 0x%x\n", *ptr_i);
}

void loop() {
  // put your main code here, to run repeatedly:
}
3

dlloyd:
Some code I've picked up from somewhere and previously tried ... not sure how accurate it is though:

#include <malloc.h>

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

extern char _end;
extern "C" char *sbrk(int i);
char *ramstart = (char *)0x20070000;
char *ramend = (char *)0x20088000;

void setup()
{
  Serial.begin(115200);
  while (!Serial);
  char *heapend = sbrk(0);
  register char * stack_ptr asm ("sp");
  struct mallinfo mi = mallinfo();
  printf("\nDynamic ram used: %d\n", mi.uordblks);
  printf("Program static ram used %d\n", &_end - ramstart);
  printf("Stack ram used %d\n", ramend - stack_ptr);
  printf("My guess at free mem: %d\n\n", stack_ptr - heapend + mi.fordblks);

int* ptr_i;
  int i = 0xaa;
  ptr_i = &i;

printf("Size of int: %d, Size of uint: %d\n", sizeof(int), sizeof(unsigned int));
  printf("Size of char: %d, Size of uchar: %d\n", sizeof(char), sizeof(unsigned char));
  printf("Size of short: %d, Size of ushort: %d\n", sizeof(short), sizeof(unsigned short));
  printf("Size of float: %d, Size of double: %d\n", sizeof(float), sizeof(double));
  printf("Size of long: %d, Size of longlong: %d\n", sizeof(long), sizeof(long long));
  printf("Size of pointer (ptr_i): %d\n", sizeof(ptr_i));
  printf("Addr of pointer (ptr_i): 0x%x\n", ptr_i);
  printf("Value of i: 0x%x\n", *ptr_i);
}

void loop() {
  // put your main code here, to run repeatedly:
}

Thanks! I'll give that a try and let you know what I get.

Regards,
Ray L.