Hi,
I followed application note AN 4996 and my application stopped working after the modifications:
Is there an example project using the STM32CubeIDE configured for an interrupt routine to run in CCM RAM?
//AT linker cmd file
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 96K
FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 512K
CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 32K
}
/*--- New CCMRAM linker section definition ---*/
_siccmram = LOADADDR(.ccmram);
/* CCMRAM section */
.ccmram :
{
. = ALIGN(4);
_sccmram = .; /* define a global symbols at ccmram start */
*(.ccmram)
*(.ccmram*)
. = ALIGN(4);
_eccmram = .; /* define a global symbols at ccmram end */
} >CCMRAM AT> FLASH
/*--- End of CCMRAM linker section definition ---*/
//At startup code:
Reset_Handler:
ldr r0, =_estack
mov sp, r0 /* set stack pointer */
/* Copy the data segment initializers from flash to SRAM */
ldr r0, =_sdata
ldr r1, =_edata
ldr r2, =_sidata
movs r3, #0
b LoopCopyDataInit
CopyDataInit:
ldr r4, [r2, r3]
str r4, [r0, r3]
adds r3, r3, #4
LoopCopyDataInit:
adds r4, r0, r3
cmp r4, r1
bcc CopyDataInit
/* Copy from flash to CCMRAM */
ldr r0, =_sccmram
ldr r1, =_eccmram
ldr r2, =_siccmram
movs r3, #0
b LoopCopyCcmInit
CopyCcmInit:
ldr r4, [r2, r3]
str r4, [r0, r3]
adds r3, r3, #4
LoopCopyCcmInit:
adds r4, r0, r3
cmp r4, r1
bcc CopyCcmInit
/* End of copy to CCMRAM */
/* Zero fill the bss segment. */
ldr r2, =_sbss
ldr r4, =_ebss
movs r3, #0
b LoopFillZerobss
FillZerobss:
str r3, [r2]
adds r2, r2, #4
LoopFillZerobss:
cmp r2, r4
bcc FillZerobss
/* Call the clock system intitialization function.*/
bl SystemInit
/* Call static constructors */
bl __libc_init_array
/* Call the application's entry point.*/
bl main
LoopForever:
b LoopForever
.size Reset_Handler, .-Reset_Handler
