Hi,
I am using MQX for my project, Where i want to check the heap usage priority. I know that we have function "_mem_get_highwater" which will give highest allocated memory but I need the percentage of memory used in the heap.
I need to start address and size of the heap(default memory pool).
Please update me if any,
Thanks,
Kalaiyarasan.
解決済! 解決策の投稿を見る。
Hi KALAIYARASAN
Unfortunately MQX does not implement a tool that calculate the amount of heap available .
The heap is defined inside the kernel memory area.
START_OF_KERNEL_AREA, END_OF_KERNEL_ARREA: an area with restricted access for user-mode tasks. It covers the KERNEL_DATA structure, default memory heap and other privileged MQX RTOS structures and data, including the kernel-owned globals.
These values are defined in the linker files as starting after all the other RAM variables, and going to end_of_kd (which is the address at the end of RAM). So the size and starting address depends on the application. The source files pick this up in
C:\Freescale\Freescale_MQX_4_2\mqx\source\bsp\<board_name>\<board_name>.h with
#define BSP_DEFAULT_START_OF_KERNEL_MEMORY ((void *)__KERNEL_DATA_START)
#define BSP_DEFAULT_END_OF_KERNEL_MEMORY ((void *)__KERNEL_DATA_END)
If you look up the map file that gets generated and search for KERNEL_DATA_START you will find where it starts explicitly.
Have a great day,
Daniel
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Hi KALAIYARASAN
Unfortunately MQX does not implement a tool that calculate the amount of heap available .
The heap is defined inside the kernel memory area.
START_OF_KERNEL_AREA, END_OF_KERNEL_ARREA: an area with restricted access for user-mode tasks. It covers the KERNEL_DATA structure, default memory heap and other privileged MQX RTOS structures and data, including the kernel-owned globals.
These values are defined in the linker files as starting after all the other RAM variables, and going to end_of_kd (which is the address at the end of RAM). So the size and starting address depends on the application. The source files pick this up in
C:\Freescale\Freescale_MQX_4_2\mqx\source\bsp\<board_name>\<board_name>.h with
#define BSP_DEFAULT_START_OF_KERNEL_MEMORY ((void *)__KERNEL_DATA_START)
#define BSP_DEFAULT_END_OF_KERNEL_MEMORY ((void *)__KERNEL_DATA_END)
If you look up the map file that gets generated and search for KERNEL_DATA_START you will find where it starts explicitly.
Have a great day,
Daniel
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hi Daniel,
Thanks for the answer,