STM32F3 CCM RAM WITH CoIDE

Asantos · ‎2014-01-29

Posted on January 29, 2014 at 14:50

I`m trying to configure a STM32F3 Project with the CoIDE 1.7.6 to run an ISR from CCM RAM basing on the AN4296 application note, but I can't put it to work with the CoIDE.

kpavlata9 · ‎2014-01-29

Posted on January 29, 2014 at 16:56

in 1.7.5:

C file:

#define CCMRAMFUNC __attribute__ ((long_call, section (''.ccmramtext'')))

and add to function declarations you want to execute in CCM.

in your .ld file:

MEMORY

{

rom (rx) : ORIGIN = 0x08000000, LENGTH = 0x00040000

ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x0000a000

ram1 (rwx) : ORIGIN = 0x10000000, LENGTH = 0x00002000

}

between .data and .bss sections put:

_siccmramtext = ADDR(.text) + SIZEOF ( .text ) + SIZEOF ( .data );

.ccmramtext : AT (_siccmramtext)

{

_sccmramtext = .;

*(.ccmramtext .ccmramtext.*)

. = ALIGN(4);

_eccmramtext = . ;

} > ram1

and to your startup file put this after data segment initialization, just before bss zeroing

pulSrc = &_siccmramtext;

for(pulDest = &_sccmramtext; pulDest < &_eccmramtext; )

{

*(pulDest++) = *(pulSrc++);

}

hope it helps,

karel

Asantos · ‎2014-01-30

Posted on January 30, 2014 at 22:36

Karel,

Thanks very much. It solved my problem.

Ari.