59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/**
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******************************************************************************
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* @file sysmem.c
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* @author Auto-generated by STM32CubeIDE
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* @brief STM32CubeIDE Minimal System Memory calls file
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*
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* For more information about which c-functions
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* need which of these lowlevel functions
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* please consult the Newlib libc-manual
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2020 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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/* Includes */
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#include <errno.h>
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#include <stdio.h>
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/* Variables */
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extern int errno;
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register char * stack_ptr asm("sp");
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/* Functions */
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/**
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_sbrk
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Increase program data space. Malloc and related functions depend on this
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**/
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caddr_t _sbrk(int incr)
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{
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extern char end asm("end");
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0)
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heap_end = &end;
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr)
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{
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errno = ENOMEM;
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return (caddr_t) -1;
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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