David Smart
Revised test using private new/delete methods suggested in http://mbed.org/forum/mbed/post/24686/
Revision 0:63f4520f2953, committed 2014-06-11
- Comitter:
- WiredHome
- Date:
- Wed Jun 11 10:59:02 2014 +0000
- Commit message:
- Added custom new/delete methods suggested in http://mbed.org/forum/mbed/post/24686/
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Utility.cpp Wed Jun 11 10:59:02 2014 +0000
@@ -0,0 +1,22 @@
+
+#include "Utility.h"
+
+uint32_t Free() {
+ uint32_t max = 50000;
+ uint32_t x = max / 2;
+ uint32_t min = 0;
+
+ __disable_irq();
+ while (min < max-1) {
+ void * p = malloc(x);
+ if (p) {
+ free(p);
+ min = x;
+ } else {
+ max = x;
+ }
+ x = (max + min)/2;
+ }
+ __enable_irq();
+ return(x);
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Utility.h Wed Jun 11 10:59:02 2014 +0000 @@ -0,0 +1,3 @@ +#include "mbed.h" + +uint32_t Free(void);
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Jun 11 10:59:02 2014 +0000
@@ -0,0 +1,56 @@
+#include "mbed.h" // blinky starts with mbed lib 76, however this was updated to lib 81
+#include "Utility.h"
+//#include "RawSerial.h"
+
+Serial pc(USBTX, USBRX);
+DigitalOut myled(LED1);
+extern "C" void mbed_reset();
+
+void* operator new(size_t size) throw()
+{
+ void *ptr;
+
+ ptr = malloc(size);
+ return ptr;
+}
+
+void operator delete(void *ptr) throw()
+{
+ free(ptr);
+}
+
+void operator delete[](void *ptr) throw()
+{
+ free(ptr);
+}
+
+int main() {
+ //pc.baud(460800); // I like a snappy terminal, so crank it up!
+ int f = Free();
+ pc.printf("\r\nBlinky eating memory - Build " __DATE__ " " __TIME__ "\r\n");
+ pc.printf(" %d bytes free\r\n", f);
+ int i = 2000;
+ int total = 0;
+
+ while(1) {
+ myled = 1;
+ wait(0.2);
+ pc.printf("Allocating %d bytes in addition to %d already allocated.\r\n", i, total);
+ char * p = new char [i]; // This never returns after 24000
+ //char * p = (char *)malloc(i); // This fails gracefully with NULL return after 24000
+ pc.printf(" %d bytes free.\r\n", Free());
+ __heapvalid((__heapprt)fprintf, stdout, 0);
+ if (p) {
+ total += i;
+ pc.printf(" Success! \r\n");
+ } else {
+ pc.printf(" Failed...\r\n");
+ break;
+ }
+ myled = 0;
+ wait(0.2);
+ }
+ pc.printf("done.\r\n");
+ while (!pc.readable()) {}
+ mbed_reset();
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Jun 11 10:59:02 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/0b3ab51c8877 \ No newline at end of file