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Merge pull request #133 from DCC-EX/neil-updates
Protect minimum memory threshold against interrupts.
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commit
62b17d4a71
@ -123,15 +123,13 @@ void loop()
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LCDDisplay::loop(); // ignored if LCD not in use
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// Optionally report any decrease in memory (will automatically trigger on first call)
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#if ENABLE_FREE_MEM_WARNING
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static int ramLowWatermark = 32767; // replaced on first loop
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// Report any decrease in memory (will automatically trigger on first call)
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static int ramLowWatermark = __INT_MAX__; // replaced on first loop
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int freeNow = updateMinimumFreeMemory();
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int freeNow = minimumFreeMemory();
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if (freeNow < ramLowWatermark)
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{
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ramLowWatermark = freeNow;
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LCD(2,F("Free RAM=%5db"), ramLowWatermark);
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}
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#endif
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}
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@ -720,7 +720,7 @@ bool DCCEXParser::parseD(Print *stream, int params, int p[])
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return true;
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case HASH_KEYWORD_RAM: // <D RAM>
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StringFormatter::send(stream, F("\nFree memory=%d\n"), freeMemory());
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StringFormatter::send(stream, F("\nFree memory=%d\n"), minimumFreeMemory());
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break;
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case HASH_KEYWORD_ACK: // <D ACK ON/OFF> <D ACK [LIMIT|MIN|MAX] Value>
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@ -111,6 +111,4 @@ The configuration file for DCC-EX Command Station
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// #define OLED_DRIVER 128,32
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/////////////////////////////////////////////////////////////////////////////////////
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//
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// Enable warning as memory gets depleted
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#define ENABLE_FREE_MEM_WARNING false
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@ -18,6 +18,7 @@
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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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@ -31,25 +32,40 @@ extern char *__malloc_heap_start;
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#endif
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static volatile int minimum_free_memory = 32767;
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static volatile int minimum_free_memory = __INT_MAX__;
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int freeMemory() {
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static inline int freeMemory() {
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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 alredy above
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#error bailed out already above
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#endif
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}
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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.
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int updateMinimumFreeMemory(unsigned char extraBytes) {
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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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int spare = freeMemory()-extraBytes;
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if (spare < 0) spare = 0;
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if (spare < minimum_free_memory) minimum_free_memory = spare;
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return minimum_free_memory;
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}
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// Return low memory value.
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int minimumFreeMemory() {
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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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@ -20,6 +20,6 @@
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#ifndef freeMemory_h
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#define freeMemory_h
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int freeMemory();
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int updateMinimumFreeMemory(unsigned char extraBytes=0);
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void updateMinimumFreeMemory(unsigned char extraBytes=0);
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int minimumFreeMemory();
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#endif
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