STM32 firmware for a remotely-controlled stepper motor demo with a mobile interface.
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526 B

#include <errno.h>
#include <stdio.h>
register char * stack_ptr asm("sp");
caddr_t _sbrk(int incr)
{
extern char end __asm("end");
static char *heap_end;
char *prev_heap_end;
if (heap_end == 0)
heap_end = &end;
prev_heap_end = heap_end;
if (heap_end + incr > stack_ptr)
{
// write(1, "Heap and stack collision\n", 25);
// abort();
errno = ENOMEM;
return (caddr_t) -1;
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
// Other systcalls are defined in
// - com/com_fileio.c
// - hw_utils/reset.h