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Update freeMemory.cpp

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Inhibit interrupts while updating/reading minimum_free_memory as it is accessed from interrupt handler.
This commit is contained in:
Neil McKechnie 2021-03-09 10:13:04 +00:00
parent 7a2beda2a9
commit fab05bac79
1 changed files with 6 additions and 1 deletions
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7
freeMemory.cpp
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@ -18,6 +18,7 @@
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>. * along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/ */
#include <Arduino.h>
#include "freeMemory.h" #include "freeMemory.h"
// thanks go to https://github.com/mpflaga/Arduino-MemoryFree // thanks go to https://github.com/mpflaga/Arduino-MemoryFree
@ -50,6 +51,10 @@ int freeMemory() {
// called subroutines. // called subroutines.
int updateMinimumFreeMemory(unsigned char extraBytes) { int updateMinimumFreeMemory(unsigned char extraBytes) {
int spare = freeMemory()-extraBytes; int spare = freeMemory()-extraBytes;
byte sreg_save = SREG;
noInterrupts();
if (spare < minimum_free_memory) minimum_free_memory = spare; if (spare < minimum_free_memory) minimum_free_memory = spare;
return minimum_free_memory; int returnValue = minimum_free_memory;
SREG = sreg_save;
return returnValue;
} }