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AN4296 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN4296
Description  The purpose of this application note is to give a presentation
PDF  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4296 Datasheet(HTML) 21 Page - STMicroelectronics

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DocID024590 Rev 3
21/25
AN4296
Execute application code from CCM RAM using a GNU-based toolchain
24
b
LoopCopyDataInit1
CopyDataInit1:
ldr
r3, =_siccmram
ldr
r3, [r3, r1]
str
r3, [r0, r1]
adds
r1, r1, #4
LoopCopyDataInit1:
ldr
r0, =_sccmram
ldr
r3, =_eccmram
adds
r2, r0, r1
cmp
r2, r3
bcc
CopyDataInit1
ldr
r2, =_sbss
b
LoopFillZerobss
/* Zero fill the bss segment. */
FillZerobss:
movs
r3, #0
str
r3, [r2], #4
LoopFillZerobss:
ldr
r3, = _ebss
cmp
r2, r3
bcc
FillZerobss
/* Call the clock system intitialization function.*/
bl
SystemInit
/* Call the application's entry point.*/
bl
main
bx
lr
4.
Place the part of code to be executed from CCM RAM in the .ccmram section by
adding the attribute key word in the function prototype:
Figure 19. GNU function placement



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