Linking variables to specific addresses
Posted: Tue Jun 18, 2024 7:33 pm
Hello, I am currently working on a large project where I need to (at this point) know in advance where a certain variable will be located after compiling and linking.
An example of this would be:
- I want to have a modifiable variable "mystruct_t test;"
- This variable MUST have a known address at all times, regardless of other code additions
- This variable must (preferably) be located in RAM in order to be able to quickly modify it on the go
Usually for other MCUs, this is simply done using the `.ld` or linker script/file.
However, for this project it is important to make the method of doing this very practical for the user to do (these are the project requirements). I could technically create my own region in the linker script of the espressif linker script, but this is probably not the intended way of doing it for the esp32. I have tried doing something like IRAM_ATTR for my variable. But this does not tell me where exactly the variable will be save to, address wise.
Thank you for your attention and help!
An example of this would be:
- I want to have a modifiable variable "mystruct_t test;"
- This variable MUST have a known address at all times, regardless of other code additions
- This variable must (preferably) be located in RAM in order to be able to quickly modify it on the go
Usually for other MCUs, this is simply done using the `.ld` or linker script/file.
However, for this project it is important to make the method of doing this very practical for the user to do (these are the project requirements). I could technically create my own region in the linker script of the espressif linker script, but this is probably not the intended way of doing it for the esp32. I have tried doing something like IRAM_ATTR for my variable. But this does not tell me where exactly the variable will be save to, address wise.
Thank you for your attention and help!