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metric for heap fragmentation (#5090)
* +Esp.getHeapUnfragness() * only in debug mode * default value * always enable, 64->32, light 32 integer square root, comments * fix when debugging is disabled * give credits * cosmetics * fragmentation metric updates (doc, better api, added getMaxFreeBlockSize()) * api reworked, +example * fixe types, fix names * coding style fix * use astyle for example
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@ -83,6 +83,10 @@ Some ESP-specific APIs related to deep sleep, RTC and flash memories are availab
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``ESP.getFreeHeap()`` returns the free heap size.
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``ESP.getHeapFragmentation()`` returns the fragmentation metric (0% is clean, more than ~50% is not harmless)
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``ESP.getMaxFreeBlockSize()`` returns the maximum allocatable ram block regarding heap fragmentation
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``ESP.getChipId()`` returns the ESP8266 chip ID as a 32-bit integer.
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``ESP.getCoreVersion()`` returns a String containing the core version.
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