stm32h747/stm32h747i-disco/CM7/Src/sysmem.c
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1 
24 /* Includes */
25 #include <errno.h>
26 #include <stdint.h>
27 
31 static uint8_t *__sbrk_heap_end = NULL;
32 
54 void *_sbrk(ptrdiff_t incr)
55 {
56  extern uint8_t _end; /* Symbol defined in the linker script */
57  extern uint8_t _estack; /* Symbol defined in the linker script */
58  extern uint32_t _Min_Stack_Size; /* Symbol defined in the linker script */
59  const uint32_t stack_limit = (uint32_t)&_estack - (uint32_t)&_Min_Stack_Size;
60  const uint8_t *max_heap = (uint8_t *)stack_limit;
61  uint8_t *prev_heap_end;
62 
63  /* Initialize heap end at first call */
64  if (NULL == __sbrk_heap_end)
65  {
66  __sbrk_heap_end = &_end;
67  }
68 
69  /* Protect heap from growing into the reserved MSP stack */
70  if (__sbrk_heap_end + incr > max_heap)
71  {
72  errno = ENOMEM;
73  return (void *)-1;
74  }
75 
76  prev_heap_end = __sbrk_heap_end;
77  __sbrk_heap_end += incr;
78 
79  return (void *)prev_heap_end;
80 }
NULL
#define NULL
Definition: porcupine/demo/c/dr_libs/tests/external/miniaudio/extras/speex_resampler/thirdparty/resample.c:92
errno
int errno
__sbrk_heap_end
static uint8_t * __sbrk_heap_end
Definition: stm32h747/stm32h747i-disco/CM7/Src/sysmem.c:31
_sbrk
void * _sbrk(ptrdiff_t incr)
_sbrk() allocates memory to the newlib heap and is used by malloc and others from the C library
Definition: stm32h747/stm32h747i-disco/CM7/Src/sysmem.c:54


picovoice_driver
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autogenerated on Fri Apr 1 2022 02:14:55