Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
10 years, 1 month ago.
How to print Free RAM, available RAM or used RAM
When using the FRDM-K64F how would you write mbed code to display or print out the free RAM or available RAM or how much RAM the program is using?
There is this question: https://developer.mbed.org/forum/mbed/topic/433/?page=2
or https://developer.mbed.org/forum/helloworld/topic/3040/
or http://developer.mbed.org/questions/7103/How-to-determine-available-RAM-at-runtim/
unsigned long heapSize()
{
char stackVariable;
void *heap;
unsigned long result;
heap = malloc(4);
result = &stackVariable - heap;
free(heap);
return result;
}
.
or https://developer.mbed.org/questions/3223/How-can-I-check-for-available-RAM/
and this code for "Demonstrating crash on memory allocation" http://developer.mbed.org/users/Kemp/code/memory_test/file/883b8bc1f54a/main.cpp
Question relating to:
2 Answers
10 years, 1 month ago.
Hi Ed,
I have found a little program to know how much RAM is available for dynamic allocation.
I call FreeMem() at several critical places to understand what happens with the memory allocation.
The code is short, I hope this can help you.
Robert
/* Using malloc() to determine free memory.*/
#include <stdio.h>
#include <stdlib.h>
#define FREEMEM_CELL 100
struct elem { /* Definition of a structure that is FREEMEM_CELL bytes in size.) */
struct elem *next;
char dummy[FREEMEM_CELL-2];
};
int FreeMem(void) {
int counter;
struct elem *head, *current, *nextone;
current = head = (struct elem*) malloc(sizeof(struct elem));
if (head == NULL)
return 0; /*No memory available.*/
counter = 0;
// __disable_irq();
do {
counter++;
current->next = (struct elem*) malloc(sizeof(struct elem));
current = current->next;
} while (current != NULL);
/* Now counter holds the number of type elem
structures we were able to allocate. We
must free them all before returning. */
current = head;
do {
nextone = current->next;
free(current);
current = nextone;
} while (nextone != NULL);
// __enable_irq();
return counter*FREEMEM_CELL;
}
.
posted by -deleted- 12 Apr 2015