push_back() causes program to stop before entering main()

Question

I\'m developing in c++ for my STM32F3 Discovery board and using std::deque as queue. After trying to debug my code (directly on device with ST-link or in simulator), the code ev

Answer 1

Try by checking if scale_buffer contains any element (scale_buffer.empty()) before calls to .back() and .front(): you are probably reading and writing some garbage, which makes the deque invalid, preparing the ground for a crash when you call push_back()

Answer 2

I had the same problem. I learnt it has something to do with so called 'semihosting' and that I should build with my project file 'retarget.c' that contains definitions of the functions like '_sys_xxxx()' that are target specific driver level functions (many versions of 'retarget.c' are part of the Keil-MDK and also ca be found on web). So I did but then linker thrown errors similar to this:

Error: L6200E: Symbol _sys_open multiply defined (by arm_xxx_lib.o and retarget.o)
Error: L6200E: Symbol _sys_close multiply defined (by arm_xxx_lib.o and retarget.o)
...

I solved this by editing original 'retarget.c' so that functions defined in it will override the ones in Keil-MDK libraries. The new 'retarged.c' is here:

#include <stdio.h>
#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

#include <rt_sys.h>

extern void $Super$$_sys_open(void);

FILEHANDLE $Sub$$_sys_open(const char *name, int openmode)
{
 return 1; /* everything goes to the same output */
}

extern void $Super$$_sys_close(void);
int $Sub$$_sys_close(FILEHANDLE fh)
{
 return 0;
}

extern void $Super$$_sys_write(void);
int $Sub$$_sys_write(FILEHANDLE fh, const unsigned char *buf,
              unsigned len, int mode)
{
 //your_device_write(buf, len);
 return 0;
}

extern void $Super$$_sys_read(void);
int $Sub$$_sys_read(FILEHANDLE fh, unsigned char *buf,
             unsigned len, int mode)
{
 return -1; /* not supported */
}

extern void $Super$$_ttywrch(void);
void $Sub$$_ttywrch(int ch)
{
 char c = ch;
 //your_device_write(&c, 1);
}

extern void $Super$$_sys_istty(void);
int $Sub$$_sys_istty(FILEHANDLE fh)
{
 return 0; /* buffered output */
}

extern void $Super$$_sys_seek(void);
int $Sub$$_sys_seek(FILEHANDLE fh, long pos)
{
 return -1; /* not supported */
}

extern void $Super$$_sys_flen(void);
long $Sub$$_sys_flen(FILEHANDLE fh)
{
 return -1; /* not supported */
}

extern void $Super$$_sys_exit(void);
long $Sub$$_sys_exit(FILEHANDLE fh)
{
 return -1; /* not supported */
}

With this version of 'retarget.c' linker was satisfied and my program run w/o problem. Maybe this will help you as well.