mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F072RB/device/TOOLCHAIN_GCC_ARM/STM32F0xxx_retarget.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
188:bcfe06ba3d64 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 188:bcfe06ba3d64 1 /* mbed Microcontroller Library
AnnaBridge 188:bcfe06ba3d64 2 * Copyright (c) 2018, STMicroelectronics
AnnaBridge 188:bcfe06ba3d64 3 * All rights reserved.
AnnaBridge 188:bcfe06ba3d64 4 *
AnnaBridge 188:bcfe06ba3d64 5 * Redistribution and use in source and binary forms, with or without
AnnaBridge 188:bcfe06ba3d64 6 * modification, are permitted provided that the following conditions are met:
AnnaBridge 188:bcfe06ba3d64 7 *
AnnaBridge 188:bcfe06ba3d64 8 * 1. Redistributions of source code must retain the above copyright notice,
AnnaBridge 188:bcfe06ba3d64 9 * this list of conditions and the following disclaimer.
AnnaBridge 188:bcfe06ba3d64 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
AnnaBridge 188:bcfe06ba3d64 11 * this list of conditions and the following disclaimer in the documentation
AnnaBridge 188:bcfe06ba3d64 12 * and/or other materials provided with the distribution.
AnnaBridge 188:bcfe06ba3d64 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
AnnaBridge 188:bcfe06ba3d64 14 * may be used to endorse or promote products derived from this software
AnnaBridge 188:bcfe06ba3d64 15 * without specific prior written permission.
AnnaBridge 188:bcfe06ba3d64 16 *
AnnaBridge 188:bcfe06ba3d64 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AnnaBridge 188:bcfe06ba3d64 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AnnaBridge 188:bcfe06ba3d64 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AnnaBridge 188:bcfe06ba3d64 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
AnnaBridge 188:bcfe06ba3d64 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AnnaBridge 188:bcfe06ba3d64 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
AnnaBridge 188:bcfe06ba3d64 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
AnnaBridge 188:bcfe06ba3d64 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
AnnaBridge 188:bcfe06ba3d64 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
AnnaBridge 188:bcfe06ba3d64 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AnnaBridge 188:bcfe06ba3d64 27 */
AnnaBridge 188:bcfe06ba3d64 28 #include <errno.h>
AnnaBridge 188:bcfe06ba3d64 29 #include "stm32f0xx.h"
AnnaBridge 188:bcfe06ba3d64 30 extern uint32_t __mbed_sbrk_start;
AnnaBridge 188:bcfe06ba3d64 31 extern uint32_t __mbed_krbs_start;
AnnaBridge 188:bcfe06ba3d64 32
AnnaBridge 188:bcfe06ba3d64 33 /* Support heap with two-region model
AnnaBridge 188:bcfe06ba3d64 34 *
AnnaBridge 188:bcfe06ba3d64 35 * The default implementation of _sbrk() (in mbed_retarget.cpp) for GCC_ARM requires one-region
AnnaBridge 188:bcfe06ba3d64 36 * model (heap and stack share one region), which doesn't fit two-region model (heap and stack
AnnaBridge 188:bcfe06ba3d64 37 * are two distinct regions)
AnnaBridge 188:bcfe06ba3d64 38 * Hence, override _sbrk() here to support heap with two-region model.
AnnaBridge 188:bcfe06ba3d64 39 */
AnnaBridge 188:bcfe06ba3d64 40 void *_sbrk(int incr)
AnnaBridge 188:bcfe06ba3d64 41 {
AnnaBridge 188:bcfe06ba3d64 42 static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start;
AnnaBridge 188:bcfe06ba3d64 43 uint32_t heap_ind_old = heap_ind;
AnnaBridge 188:bcfe06ba3d64 44 uint32_t heap_ind_new = heap_ind_old + incr;
AnnaBridge 188:bcfe06ba3d64 45
AnnaBridge 188:bcfe06ba3d64 46 if (heap_ind_new > (uint32_t) &__mbed_krbs_start) {
AnnaBridge 188:bcfe06ba3d64 47 errno = ENOMEM;
AnnaBridge 188:bcfe06ba3d64 48 return (void *) -1;
AnnaBridge 188:bcfe06ba3d64 49 }
AnnaBridge 188:bcfe06ba3d64 50
AnnaBridge 188:bcfe06ba3d64 51 heap_ind = heap_ind_new;
AnnaBridge 188:bcfe06ba3d64 52
AnnaBridge 188:bcfe06ba3d64 53 return (void *) heap_ind_old;
AnnaBridge 188:bcfe06ba3d64 54 }