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setup.s
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setup.s
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PINSEL2 EQU 0xE002C014
IO1DIR EQU 0xE0028018
;CODE TO SETUP STACK FOR THE SYSTEM
AREA setup,CODE,READONLY
EXPORT setup
LDR R0,=PINSEL2
LDR R1,[R0]
LDR R2,=1
BIC R1,R1,R2,LSL #3
STR R1,[R0]
LDR R0,=IO1DIR
LDR R1,[R0]
LDR R2,=1
ORR R1,R1,R2,LSL #16
STR R1,[R0]
LDR R0,=0X03
LDR R1,=16
SWI 0
;LDR R0,0X02
;LDR R1,=16
;SWI 0
LDR R0,=0x40003FCC ;STORE STARTING ADDRESSES OF FLASH FOR EACH PROCESS AT 4000XFCC LOCATION!
LDR R1,=0x00010000
STR R1,[R0]
LDR R0,=0X40004FCC
LDR R1,=0X00018000
STR R1,[R0]
LDR R0,=0X40005FCC
LDR R1,=0X00020000
STR R1,[R0]
LDR R2,=0X40000FCC
LDR R3,=0X40001FDC ; STORE SP VALUE FOR ALL OTHER 3 PROCESSES
STMIA R3,{R2}
LDR R3,=0X40001FE0
STMIA R3,{R2}
LDR R3,=0X40001FE4
STMIA R3,{R2}
LDR R6,=0X40001FFC
LDR R5,=0X00000000
STR R5,[R6]
;seting up values for the process state as all ready
LDR R8,=0x40001F15
LDR R9,=0
STRB R9,[R8]
ADD R8,R8,#1
STRB R9,[R8]
ADD R8,R8,#1
STRB R9,[R8]
ADD R8,R8,#1
;to block a process
;LDR R9,=0x00
STRB R9,[R8]
;seting up the schedular queu
LDR R8,=0x40001F10
LDR R9,=0
STRB R9,[R8]
ADD R8,R8,#1
ADD R9,R9,#1
STRB R9,[R8]
ADD R8,R8,#1
ADD R9,R9,#1
STRB R9,[R8]
ADD R8,R8,#1
ADD R9,R9,#1
STRB R9,[R8]
LDR R13,=0x40000FD0
BX R14
END