/****************************************************************************** * @file startup_NUC472_442.c * @version V0.10 * $Revision: 11 $ * $Date: 15/09/02 10:02a $ * @brief CMSIS Cortex-M4 Core Peripheral Access Layer Source File for NUC472/442 MCU * * @note * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved. *****************************************************************************/ #include "NUC472_442.h" #include <errno.h> #include "nu_miscutil.h" extern uint32_t __mbed_sbrk_start; extern uint32_t __mbed_krbs_start; #define NU_HEAP_ALIGN 32 /** * The default implementation of _sbrk() (in common/retarget.cpp) for GCC_ARM requires one-region model (heap and stack share one region), which doesn't * fit two-region model (heap and stack are two distinct regions), for example, NUMAKER-PFM-NUC472 locates heap on external SRAM. Define __wrap__sbrk() to * override the default _sbrk(). It is expected to get called through gcc hooking mechanism ('-Wl,--wrap,_sbrk') or in _sbrk(). */ void *__wrap__sbrk(int incr) { static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start; uint32_t heap_ind_old = NU_ALIGN_UP(heap_ind, NU_HEAP_ALIGN); uint32_t heap_ind_new = NU_ALIGN_UP(heap_ind_old + incr, NU_HEAP_ALIGN); if (heap_ind_new > &__mbed_krbs_start) { errno = ENOMEM; return (void *) -1; } heap_ind = heap_ind_new; return (void *) heap_ind_old; }