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Hello,
I would like to create a firmware and an application running on the same device.
The application needs to call some functions of the firmware. The application can be updated whereas the firmware is still the same.
Therefore, i want to have 2 projects: one for the firmware (C coded) and one for the application (C coded).
I have seen that it's possible to forbid idata, xdata and code area in order to prevent the application to overwrite the firmware and its variables, but I have no clues on how to give my firmware prototype to my application. Of course parameters and functions' addresses must map with the firmware mapping.
Does anyone have an idea how I can do this?
Thanks for your help! Damien.
I just have to find how to tell the linker to not use some part of ibit and idata. So far, my attempts were not successful (using IBIT and IDATA linker directive).
It should be obvoous that if you change the bootloader/BIOS you need to change the app as well, the below requires that.
write an assembler module with all global BDATA/DATA/IDATA/PDATA/XDATA that the bootloader/BIOS uses and link it with both bootloader/BIOS and app. for the bootloader/BIOS write a .h module that defines all variables in the asm module as extern.
If you want to, you can even link that with the app.
There will be a requirement that all functions are declared reentrant to make them not use call tree since one will not be aware of the other. If main() can not be declared reentrant there can be no locval variables in main()
Erik