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How is it possible to tell a variable / or struct array their specific memory address?
e.g. I store the whole c-file in the internal ram (linker-script) and only this one variable I want to store it in the external SRAM at the address 0x10000000?
thanks in advance JChris
The best way to control such things is to use multiple source files, and then write a link script that specifically orders data and/or code from the individual source files into specific memory areas.
Even simpler would be:
#include <absacc.h> int x __at (0x10000000); // variable at address 0x10000000
That is a good way to access a processor SFR or similar. But it may fail very badly if the address happens to be in a memory area that the linker has access to. Then the application may try to store multiple information on the same location.
I've a similar question: I want to store a global char array in the external memory. At the moment the char array is stored in the flash memory, because the compiler don't see that the values of the array will be changed during the programm.
Because this array will be filled with the values receiving by the usb interface. How could I tell the compiler to store this array in the ram not in the flash memory?
best regards Frank
I disagree with you Per. It will not fail.
When using "__at" the linker will place it at the absolute address and nothing else will be put there.
It will try, but thankfully the linker will (hopefully always) complain about incompatible segments.