Difference between revisions of "Place Functions in RAM with SEGGER Linker"
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This article will show how to place a function into RAM with SEGGER Linker and Embedded Studio. To make sure this stays valid after a reset/reboot of the device the function must be initialized during startup by copying them from Flash to RAM. That way the application also works stand alone without a debugger. |
This article will show how to place a function into RAM with SEGGER Linker and Embedded Studio. To make sure this stays valid after a reset/reboot of the device the function must be initialized during startup by copying them from Flash to RAM. That way the application also works stand alone without a debugger. |
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| − | = How to= |
+ | == How to== |
* Create a function you want to place in RAM |
* Create a function you want to place in RAM |
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For more information see the SEGGER Linker reference manual [http://studio.segger.com/segger/UM20005_Linker.pdf UM20005] |
For more information see the SEGGER Linker reference manual [http://studio.segger.com/segger/UM20005_Linker.pdf UM20005] |
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| − | = Example project= |
+ | == Example project== |
The following example project will show an example implementation of such RAM function. A simple function Count() is created which is placed in RAM and executed. |
The following example project will show an example implementation of such RAM function. A simple function Count() is created which is placed in RAM and executed. |
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| − | == Prerequisites == |
+ | === Prerequisites === |
To be able to build and debug the project the following prerequisites must be met: |
To be able to build and debug the project the following prerequisites must be met: |
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| − | * SEGGER Embedded Studio |
+ | * SEGGER Embedded Studio V7.32 or later |
* Any J-Link |
* Any J-Link |
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* [https://shop.segger.com/Cortex_M_Trace_Reference_Board_p/6.68.18.htm Cortex-M Trace Reference Board] |
* [https://shop.segger.com/Cortex_M_Trace_Reference_Board_p/6.68.18.htm Cortex-M Trace Reference Board] |
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| − | == Project files == |
+ | === Project files === |
[[Media:RAMFunc_Example.zip|RAMFunc_Example.zip]] |
[[Media:RAMFunc_Example.zip|RAMFunc_Example.zip]] |
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Latest revision as of 10:18, 31 August 2023
This article will show how to place a function into RAM with SEGGER Linker and Embedded Studio. To make sure this stays valid after a reset/reboot of the device the function must be initialized during startup by copying them from Flash to RAM. That way the application also works stand alone without a debugger.
How to
- Create a function you want to place in RAM
- Open the SEGGER Linker script file and place the specific function symbol in a section. This can be done e.g. as follows in your application source code:
void __attribute((section(".ramfunc"))) MyFunc(void) {
...
}
- Alternatively you can place symbols directly in the SEGGER Linker script file as shown in the example project linked below
- Now place the section in the linker script in RAM
place in RAM { section .ramfunc };
- Now make sure it is initialized by copy even without a debugger
initialize by copy { section .ramfunc };
For more information see the SEGGER Linker reference manual UM20005
Example project
The following example project will show an example implementation of such RAM function. A simple function Count() is created which is placed in RAM and executed.
Prerequisites
To be able to build and debug the project the following prerequisites must be met:
- SEGGER Embedded Studio V7.32 or later
- Any J-Link
- Cortex-M Trace Reference Board
