| /** |
| ***************************************************************************** |
| ** |
| ** File : sysmem.c |
| ** |
| ** Author : Auto-generated by STM32CubeIDE |
| ** |
| ** Abstract : STM32CubeIDE Minimal System Memory calls file |
| ** |
| ** For more information about which c-functions |
| ** need which of these lowlevel functions |
| ** please consult the Newlib libc-manual |
| ** |
| ** Environment : STM32CubeIDE MCU |
| ** |
| ** Distribution: The file is distributed as is, without any warranty |
| ** of any kind. |
| ** |
| ***************************************************************************** |
| ** |
| ** <h2><center>© COPYRIGHT(c) 2018 STMicroelectronics</center></h2> |
| ** |
| ** Redistribution and use in source and binary forms, with or without modification, |
| ** are permitted provided that the following conditions are met: |
| ** 1. Redistributions of source code must retain the above copyright notice, |
| ** this list of conditions and the following disclaimer. |
| ** 2. Redistributions in binary form must reproduce the above copyright notice, |
| ** this list of conditions and the following disclaimer in the documentation |
| ** and/or other materials provided with the distribution. |
| ** 3. Neither the name of STMicroelectronics nor the names of its contributors |
| ** may be used to endorse or promote products derived from this software |
| ** without specific prior written permission. |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| ** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| ** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| ** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| ** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| ** |
| ** |
| ***************************************************************************** |
| */ |
| |
| /* Includes */ |
| #include <errno.h> |
| #include <stdio.h> |
| |
| /* Variables */ |
| extern int errno; |
| register char * stack_ptr asm("sp"); |
| |
| /* Functions */ |
| |
| /** |
| _sbrk |
| Increase program data space. Malloc and related functions depend on this |
| **/ |
| 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) |
| { |
| errno = ENOMEM; |
| return (caddr_t) -1; |
| } |
| |
| heap_end += incr; |
| |
| return (caddr_t) prev_heap_end; |
| } |
| |