lpcware

How does memory configuration works?

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by zou9a on Mon Feb 22 03:03:37 MST 2016
Hi,
I'm using the last LPCXpresso, to make an application embedded on a LPC1788 + an external SDRAM 32M (K4S561632C)

I have to use and split the ext.SDRAM to 4 regions. The first and the second will be used for the LCD buffer (2 LCD buffer), the third one is an array of a &graphic objet. The last one will save the content of the graphic object. simple no :)

I started by creating a new memory in the project's properties -> MCU settings -> Memory config.

Then, I have allocated using malloc a big array:

      
 unsigned long* unUsed;
unUsed = malloc(512*1024*1024*sizeof(unsigned long));
_printPointer(50, 100, "unUsed pointer", &unUsed[512*1024*1024-1]);


The printed address returns me 0x9000 1160. When I looked to the UM, it seems that address corresponds to an external SRAM and not the external SDRAM (might be 0xA........ in my case)

So, my question is why I have this value and not the attended one?

Thank you

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