Kinetis Design Studio中的主题 Re: Odd new() exception - K22F KDS

Odd new() exception - K22F KDS

tharonhall — Fri, 26 Jun 2015 15:34:47 GMT

I am getting a rather odd __cxa_throw() exception using operator new() using KDS and a K22F. I saw, odd, because it happens on only maybe the second invocation of new(), and there is PLENTY of room on the heap.

Using the representative code below:

class_ptr1 = new Class("Class 1");

class_ptr2 = new Class("Class 2");

class_ptr1 is assigned the address 0x20000020

When the attempt to allocate the second class fires, I get the __cxa_throw() exception. Of course, this would typically mean I am out of memory, but I have TONS of space left in the heap, unless i am reading this wrong somehow and the space is allocated top to bottom and not bottom to top:

.heap 0x20000000 0x8000

0x20000000 . = ALIGN (0x8)

0x20000000 __end__ = .

0x20000000 PROVIDE (end, .)

0x20000000 __HeapBase = .

0x20008000 . = (. + HEAP_SIZE)

Anyone else seen this? This triggered after I changed my OSA from Bare Metal to FreeRTOS, so something funny may have happened there.

This has stopped me in my tracks, so any help GREATLY appreciated. Thanks!

Re: Odd new() exception - K22F KDS

tharonhall — Fri, 26 Jun 2015 19:58:04 GMT

So it appears that FreeRTOS didn't pull back into the code as cleanly as I had hoped. I did some clean up and the trap went away. Know I am having other issues with FreeRTOS, which I did not see before. It makes me suspicious that some more things are not set up correctly.

Will look at a clean FreeRTOS build for reference and see if I can't find something that is amiss.

Re: Odd new() exception - K22F KDS

Carlos_Mendoza — Thu, 02 Jul 2015 21:45:55 GMT

Hi Tharon,

Is good to hear that the problem with the __cxa_throw() exception was fixed, please let us know if you you run into any other problem.

Best Regards,

Carlos Mendoza

Technical Support Engineer