mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-22 23:56:13 +01:00
118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
/*
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* © 2020, Harald Barth
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* © 2021, Neil McKechnie
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*
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* This file is part of Asbelos DCC-EX
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <Arduino.h>
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#include "freeMemory.h"
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// thanks go to https://github.com/mpflaga/Arduino-MemoryFree
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#if defined(__arm__)
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extern "C" char *sbrk(int);
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#elif defined(__AVR__)
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extern char *__brkval;
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extern char *__malloc_heap_start;
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#else
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#error Unsupported board type
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#endif
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static volatile int minimum_free_memory = __INT_MAX__;
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#if !defined(__IMXRT1062__)
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inline int freeMemory()
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// static inline int freeMemory()
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{
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char top;
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#if defined(__arm__)
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return &top - reinterpret_cast<char *>(sbrk(0));
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#elif defined(__AVR__)
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return __brkval ? &top - __brkval : &top - __malloc_heap_start;
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#else
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#error bailed out already above
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#endif
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}
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// Return low memory value.
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int minimumFreeMemory()
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{
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byte sreg_save = SREG;
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noInterrupts(); // Disable interrupts
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int retval = minimum_free_memory;
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SREG = sreg_save; // Restore interrupt state
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return retval;
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}
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#else
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#if defined(ARDUINO_TEENSY40)
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static const unsigned DTCM_START = 0x20000000UL;
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static const unsigned OCRAM_START = 0x20200000UL;
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static const unsigned OCRAM_SIZE = 512;
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static const unsigned FLASH_SIZE = 1984;
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#elif defined(ARDUINO_TEENSY41)
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static const unsigned DTCM_START = 0x20000000UL;
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static const unsigned OCRAM_START = 0x20200000UL;
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static const unsigned OCRAM_SIZE = 512;
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static const unsigned FLASH_SIZE = 7936;
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#if TEENSYDUINO > 151
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extern "C" uint8_t external_psram_size;
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#endif
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#endif
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static inline int freeMemory()
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{
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extern unsigned long _ebss;
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extern unsigned long _sdata;
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extern unsigned long _estack;
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const unsigned DTCM_START = 0x20000000UL;
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unsigned dtcm = (unsigned)&_estack - DTCM_START;
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unsigned stackinuse = (unsigned)&_estack - (unsigned)__builtin_frame_address(0);
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unsigned varsinuse = (unsigned)&_ebss - (unsigned)&_sdata;
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unsigned freemem = dtcm - (stackinuse + varsinuse);
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return freemem;
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}
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// Return low memory value.
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int minimumFreeMemory()
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{
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//byte sreg_save = SREG;
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//noInterrupts(); // Disable interrupts
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int retval = minimum_free_memory;
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//SREG = sreg_save; // Restore interrupt state
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return retval;
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}
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#endif
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// Update low ram level. Allow for extra bytes to be specified
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// by estimation or inspection, that may be used by other
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// called subroutines. Must be called with interrupts disabled.
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//
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// Although __brkval may go up and down as heap memory is allocated
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// and freed, this function records only the worst case encountered.
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// So even if all of the heap is freed, the reported minimum free
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// memory will not increase.
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//
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void updateMinimumFreeMemory(unsigned char extraBytes)
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{
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int spare = freeMemory() - extraBytes;
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if (spare < 0)
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spare = 0;
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if (spare < minimum_free_memory)
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minimum_free_memory = spare;
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}
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