sysmem.c File Reference

STM32CubeIDE System Memory calls file. More...

#include <errno.h>
#include <stdint.h>

Include dependency graph for sysmem.c:

Functions
void *	_sbrk (ptrdiff_t incr)
	_sbrk() allocates memory to the newlib heap and is used by malloc and others from the C library More...

Variables
static uint8_t *	__sbrk_heap_end = NULL

Detailed Description

STM32CubeIDE System Memory calls file.

Author

Generated by STM32CubeIDE

       For more information about which C functions
       need which of these lowlevel functions
       please consult the newlib libc manual

Attention

© Copyright (c) 2020 STMicroelectronics. All rights reserved.

This software component is licensed by ST under BSD 3-Clause license, the "License"; You may not use this file except in compliance with the License. You may obtain a copy of the License at: opensource.org/licenses/BSD-3-Clause

Function Documentation

_sbrk()

void* _sbrk

(

ptrdiff_t

incr

)

_sbrk() allocates memory to the newlib heap and is used by malloc and others from the C library

* ############################################################################
* #  .data  #  .bss  #       newlib heap       #          MSP stack          #
* #         #        #                         # Reserved by _Min_Stack_Size #
* ############################################################################
* ^-- RAM start      ^-- _end                             _estack, RAM end --^
* 

This implementation starts allocating at the '_end' linker symbol The '_Min_Stack_Size' linker symbol reserves a memory for the MSP stack The implementation considers '_estack' linker symbol to be RAM end NOTE: If the MSP stack, at any point during execution, grows larger than the reserved size, please increase the '_Min_Stack_Size'.

Parameters

incr	Memory size

Returns

Pointer to allocated memory

References __sbrk_heap_end, and errno.

Variable Documentation

__sbrk_heap_end

uint8_t* __sbrk_heap_end = NULL

static

Pointer to the current high watermark of the heap usage