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# Memory analysis
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# Memory analysis
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## FreeRTOS heap and task stack
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## FreeRTOS heap and task stack
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FreeRTOS statically allocate its own heap buffer in a global variable named `ucHeap`. This is an aray of *uint8_t*. Its size is specified by the definition `configTOTAL_HEAP_SIZE` in *FreeRTOSConfig.h*
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FreeRTOS statically allocate its own heap buffer in a global variable named `ucHeap`. This is an array of *uint8_t*. Its size is specified by the definition `configTOTAL_HEAP_SIZE` in *FreeRTOSConfig.h*
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FreeRTOS uses this buffer to allocate memory for tasks stack and all the RTOS object created during runtime (timers, mutexes,...).
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FreeRTOS uses this buffer to allocate memory for tasks stack and all the RTOS object created during runtime (timers, mutexes,...).
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The function `xPortGetFreeHeapSize()` returns the amount of memory available in this *ucHeap* buffer. If this value reaches 0, FreeRTOS runs out of memory.
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The function `xPortGetFreeHeapSize()` returns the amount of memory available in this *ucHeap* buffer. If this value reaches 0, FreeRTOS runs out of memory.
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*TODO*
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*TODO*
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#Tools
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#Tools
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- https://github.com/eliotstock/memory : display the memory usage (FLASH/RAM) using the .map file from GCC.
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- https://github.com/eliotstock/memory : display the memory usage (FLASH/RAM) using the .map file from GCC.
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