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AN2367 数据表(PDF) 8 Page - STMicroelectronics

部件名 AN2367
功能描述  This application note describes an optimized memory copy
PDF  13 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2367 数据表(HTML) 8 Page - STMicroelectronics

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Code (IAR Version)
AN2367
8/13
Appendix A
Code (IAR Version)
MODULE MEMORYP
PUBLIC MEMCOPY_L2S_BY4
RSEG ICODE:CODE(4)
CODE32
MEMCOPY_L2S_BY4
STMFD
SP!, {R4-R10}
d_main
LDMIA
R1!,{R3,R5,R7,R9}
MOV
R4, R3, LSR #16
MOV
R6, R5, LSR #16
MOV
R8, R7, LSR #16
MOV
R10, R9, LSR #16
STRH
R3, [R0], #2
STRH
R4, [R0], #2
STRH
R5, [R0], #2
STRH
R6, [R0], #2
STRH
R7, [R0], #2
STRH
R8, [R0], #2
STRH
R9, [R0], #2
STRH
R10, [R0], #2
SUB
R2, R2, #16
CMP
R2,#16
; if ( remaining_bytes >= 16)
BHS
d_main
; keep on looping
; else switch(remaining_bytes)
d_swit
d_0123
CMP
R2,#3
; remaining <= 3 bytes?
BLS
d_switch
d_4567
LDR
R3, [R1], #4
MOV
R4, R3, LSR #16
STRH
R3, [R0], #2
STRH
R4, [R0], #2



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