Is it possible to use the external memory (XMEM) interface of an ATmega2560 with the Arduino Simulink Support Package ?

Hello,

I am using simulink with an Arduino Mega 2560 (Atmel ATmega2560 microcontroller). I would like to know if it is possible to use the external memory (XMEM) interface of this microcontroller with the Simulink support package ? In my model, I have to deal with big array. It is the reason why I run out of 8kbyte data memory (.data + .bss + .noinit).

Here is the things I have already done :

• I followed the Andy’s tutorial (<http://andybrown.me.uk/2011/08/28/512kb-sram-expansion-for-the-arduino-mega-design/>) to increase the Arduino Mega 2560 SRAM. With the Arduino IDE, I succeeded to declare a big array in the external SRAM using malloc(). So the hardware seems to be good.
• I read some documents about memory section of the Atmel microcontrollers (https://www.nongnu.org/avr-libc/user-manual/mem_sections.html) and I tried to modify the linkers of Simulink Code Generation to move .data .bss and the heap in the external SRAM but it is not working (However, I am not well with Linkers, maybe I am doing something wrong in linkers customization).

I think that the solution is to move “Block signals” and “Block states” structures of the generate code in the external SRAM but I don’t know how to proceed.

Thank for your advice,

Regards

FG