| /***********************************************************************************************************************
|
| * DISCLAIMER
|
| * This software is supplied by Renesas Electronics Corporation and is only intended for use with Renesas products. No
|
| * other uses are authorized. This software is owned by Renesas Electronics Corporation and is protected under all
|
| * applicable laws, including copyright laws.
|
| * THIS SOFTWARE IS PROVIDED "AS IS" AND RENESAS MAKES NO WARRANTIES REGARDING
|
| * THIS SOFTWARE, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY,
|
| * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. ALL SUCH WARRANTIES ARE EXPRESSLY DISCLAIMED. TO THE MAXIMUM
|
| * EXTENT PERMITTED NOT PROHIBITED BY LAW, NEITHER RENESAS ELECTRONICS CORPORATION NOR ANY OF ITS AFFILIATED COMPANIES
|
| * SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY REASON RELATED TO THIS
|
| * SOFTWARE, EVEN IF RENESAS OR ITS AFFILIATES HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
|
| * Renesas reserves the right, without notice, to make changes to this software and to discontinue the availability of
|
| * this software. By using this software, you agree to the additional terms and conditions found by accessing the
|
| * following link:
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| * http://www.renesas.com/disclaimer
|
| *
|
| * Copyright (C) 2012 Renesas Electronics Corporation. All rights reserved.
|
| ***********************************************************************************************************************/
|
| /***********************************************************************************************************************
|
| * File Name : sbrk.c
|
| * Device(s) : RX
|
| * Description : Configures the MCU heap memory. The size of the heap is defined by the macro HEAPSIZE below.
|
| ***********************************************************************************************************************/
|
| /***********************************************************************************************************************
|
| * History : DD.MM.YYYY Version Description
|
| * : 26.10.2011 1.00 First Release
|
| * : 12.03.2012 1.10 Heap size is now defined in r_bsp_config.h, not sbrk.h.
|
| ***********************************************************************************************************************/
|
| /***********************************************************************************************************************
|
| Includes <System Includes> , "Project Includes"
|
| ***********************************************************************************************************************/
|
| /* Provides standard definitions used in this file */ |
| #include <stddef.h> |
| /* Defines standard input/output functions used in this file */ |
| #include <stdio.h> |
| /* Defines standard variable types used in this file */ |
| #include <stdint.h>
|
| /* Used for getting HEAP_BYTES macro. */
|
| #include "platform.h" |
|
|
| /***********************************************************************************************************************
|
| Macro definitions
|
| ***********************************************************************************************************************/
|
| |
| /*********************************************************************************************************************** |
| Function Prototypes |
| ***********************************************************************************************************************/ |
| /* Memory allocation function prototype declaration */ |
| int8_t *sbrk(size_t size); |
| |
| /*********************************************************************************************************************** |
| Global Variables |
| ***********************************************************************************************************************/ |
| //const size_t _sbrk_size= /* Specifies the minimum unit of */ |
| /* the defined heap area */ |
| extern int8_t *_s1ptr; |
| |
| union HEAP_TYPE |
| { |
| int32_t dummy; /* Dummy for 4-byte boundary */ |
| int8_t heap[HEAP_BYTES]; /* Declaration of the area managed by sbrk*/
|
| }; |
| /* Declare memory heap area */ |
| static union HEAP_TYPE heap_area; |
| /* End address allocated by sbrk */ |
| static int8_t *brk=(int8_t *)&heap_area; |
| |
| /***********************************************************************************************************************
|
| * Function name: sbrk
|
| * Description : This function configures MCU memory area allocation.
|
| * Arguments : size -
|
| * assigned area size
|
| * Return value : Start address of allocated area (pass)
|
| * -1 (failure)
|
| ***********************************************************************************************************************/
|
| int8_t *sbrk(size_t size) |
| { |
| int8_t *p; |
| |
| if (brk+size > heap_area.heap+HEAP_BYTES) |
| { |
| /* Empty area size */ |
| p = (int8_t *)-1; |
| } |
| else |
| { |
| /* Area assignment */ |
| p = brk; |
| |
| /* End address update */ |
| brk += size; |
| } |
| |
| /* Return result */ |
| return p; |
| } |
