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display address CCM

Question asked by ludovic Wiart on Sep 15, 2017
Latest reply on Sep 18, 2017 by ludovic Wiart

Hi,

 

I try to move some array in CCM on stm32f415.

 

I modify the ld script with 

 CCM_SRAM   (rwx) : ORIGIN = 0x10000000, LENGTH = 64K 

.ccmram :
{
. = ALIGN(4);
_sccmram = .; /* create a global symbol at ccmram start */
*(.ccmram)
*(.ccmram*)

. = ALIGN(4);
_eccmram = .; /* create a global symbol at ccmram end */
}> CCM_SRAM

 

In my programe I had 2 global array:

 

char buffer[1024];
char in_ccram_buffer[1024] __attribute__((section("ccmram")));

 

and I print there address :

 

printf (" buffer = %08x    in_ccram_buffer = %08x\n",&buffer,&in_ccram_buffer  );

 

the result is :

buffer = 20001a3c    in_ccram_buffer = 20000ce4

 

I don't understand why the in_ccram_buffer isn't in 0x1000.....

 

 

 

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