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targets/TARGET_STM/TARGET_STM32L4/l4_retarget.c@183:a56a73fd2a6f, 2018-03-20 (annotated)

Committer:
AnnaBridge
Date:
Tue Mar 20 16:56:18 2018 +0000
Revision:
183:a56a73fd2a6f
mbed-dev library. Release version 160

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AnnaBridge 183:a56a73fd2a6f 1 /**
AnnaBridge 183:a56a73fd2a6f 2 ******************************************************************************
AnnaBridge 183:a56a73fd2a6f 3 * @file l4_retarget.c
AnnaBridge 183:a56a73fd2a6f 4 * @author MCD Application Team
AnnaBridge 183:a56a73fd2a6f 5 * @brief CMSIS Cortex-M4 Core Peripheral Access Layer Source File for STM32L475xG
AnnaBridge 183:a56a73fd2a6f 6 ******************************************************************************
AnnaBridge 183:a56a73fd2a6f 7 * @attention
AnnaBridge 183:a56a73fd2a6f 8 *
AnnaBridge 183:a56a73fd2a6f 9 * <h2><center>&copy; COPYRIGHT(c) 2018 STMicroelectronics</center></h2>
AnnaBridge 183:a56a73fd2a6f 10 *
AnnaBridge 183:a56a73fd2a6f 11 * Redistribution and use in source and binary forms, with or without modification,
AnnaBridge 183:a56a73fd2a6f 12 * are permitted provided that the following conditions are met:
AnnaBridge 183:a56a73fd2a6f 13 * 1. Redistributions of source code must retain the above copyright notice,
AnnaBridge 183:a56a73fd2a6f 14 * this list of conditions and the following disclaimer.
AnnaBridge 183:a56a73fd2a6f 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
AnnaBridge 183:a56a73fd2a6f 16 * this list of conditions and the following disclaimer in the documentation
AnnaBridge 183:a56a73fd2a6f 17 * and/or other materials provided with the distribution.
AnnaBridge 183:a56a73fd2a6f 18 * 3. Neither the name of STMicroelectronics nor the names of its contributors
AnnaBridge 183:a56a73fd2a6f 19 * may be used to endorse or promote products derived from this software
AnnaBridge 183:a56a73fd2a6f 20 * without specific prior written permission.
AnnaBridge 183:a56a73fd2a6f 21 *
AnnaBridge 183:a56a73fd2a6f 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AnnaBridge 183:a56a73fd2a6f 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AnnaBridge 183:a56a73fd2a6f 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AnnaBridge 183:a56a73fd2a6f 25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
AnnaBridge 183:a56a73fd2a6f 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AnnaBridge 183:a56a73fd2a6f 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
AnnaBridge 183:a56a73fd2a6f 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
AnnaBridge 183:a56a73fd2a6f 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
AnnaBridge 183:a56a73fd2a6f 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
AnnaBridge 183:a56a73fd2a6f 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AnnaBridge 183:a56a73fd2a6f 32 *
AnnaBridge 183:a56a73fd2a6f 33 ******************************************************************************
AnnaBridge 183:a56a73fd2a6f 34 */
AnnaBridge 183:a56a73fd2a6f 35 #if (defined(TWO_RAM_REGIONS) && defined(__GNUC__) && !defined(__CC_ARM))
AnnaBridge 183:a56a73fd2a6f 36 #include <errno.h>
AnnaBridge 183:a56a73fd2a6f 37 #include "stm32l4xx.h"
AnnaBridge 183:a56a73fd2a6f 38 extern uint32_t __mbed_sbrk_start;
AnnaBridge 183:a56a73fd2a6f 39 extern uint32_t __mbed_krbs_start;
AnnaBridge 183:a56a73fd2a6f 40
AnnaBridge 183:a56a73fd2a6f 41 #define STM32L4_HEAP_ALIGN 32
AnnaBridge 183:a56a73fd2a6f 42 #define STM32L4_ALIGN_UP(X, ALIGN) (((X) + (ALIGN) - 1) & ~((ALIGN) - 1))
AnnaBridge 183:a56a73fd2a6f 43 /**
AnnaBridge 183:a56a73fd2a6f 44 * The default implementation of _sbrk() (in platform/mbed_retarget.cpp) for GCC_ARM requires one-region model (heap and
AnnaBridge 183:a56a73fd2a6f 45 * stack share one region), which doesn't fit two-region model (heap and stack are two distinct regions), for example,
AnnaBridge 183:a56a73fd2a6f 46 * STM32L475xG locates heap on SRAM1 and stack on SRAM2.
AnnaBridge 183:a56a73fd2a6f 47 * Define __wrap__sbrk() to override the default _sbrk(). It is expected to get called through gcc
AnnaBridge 183:a56a73fd2a6f 48 * hooking mechanism ('-Wl,--wrap,_sbrk') or in _sbrk().
AnnaBridge 183:a56a73fd2a6f 49 */
AnnaBridge 183:a56a73fd2a6f 50 void *__wrap__sbrk(int incr)
AnnaBridge 183:a56a73fd2a6f 51 {
AnnaBridge 183:a56a73fd2a6f 52 static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start;
AnnaBridge 183:a56a73fd2a6f 53 uint32_t heap_ind_old = STM32L4_ALIGN_UP(heap_ind, STM32L4_HEAP_ALIGN);
AnnaBridge 183:a56a73fd2a6f 54 uint32_t heap_ind_new = STM32L4_ALIGN_UP(heap_ind_old + incr, STM32L4_HEAP_ALIGN);
AnnaBridge 183:a56a73fd2a6f 55
AnnaBridge 183:a56a73fd2a6f 56 if (heap_ind_new > &__mbed_krbs_start) {
AnnaBridge 183:a56a73fd2a6f 57 errno = ENOMEM;
AnnaBridge 183:a56a73fd2a6f 58 return (void *) -1;
AnnaBridge 183:a56a73fd2a6f 59 }
AnnaBridge 183:a56a73fd2a6f 60
AnnaBridge 183:a56a73fd2a6f 61 heap_ind = heap_ind_new;
AnnaBridge 183:a56a73fd2a6f 62
AnnaBridge 183:a56a73fd2a6f 63 return (void *) heap_ind_old;
AnnaBridge 183:a56a73fd2a6f 64 }
AnnaBridge 183:a56a73fd2a6f 65 #endif /* GCC_ARM toolchain && TWO_RAM_REGIONS*/
AnnaBridge 183:a56a73fd2a6f 66