?? init.a51
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$NOMOD51
;------------------------------------------------------------------------------
; This file is part of the C51 Compiler package
; Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.
;------------------------------------------------------------------------------
; INIT.A51: This code is executed, if the application program contains
; initialized variables at file level.
;
; If you are using uVision2, just add the file as last file to your project.
; *** IMPORTANT NOTE ***: this file needs to be the last file of the linker
; input list. If you are using uVision2 this file should be therefore the
; last file in your project tree.
;
;
; To translate this file use Ax51 with the following invocation:
;
; Ax51 INIT.A51
;
; To link the modified INIT.OBJ file to your application use the following
; linker invocation:
;
; Lx51 <your object file list>, INIT.OBJ <controls>
;
;------------------------------------------------------------------------------
;
; User-defined Watch-Dog Refresh.
;
; If the C application contains many initialized variables uses a watchdog
; it might be possible that the user has to include a watchdog refresh into
; the initialization process. The watchdog refresh routine can be included
; in the following MACRO and can alter all CPU registers except
; DPTR.
;
WATCHDOG MACRO
CPL 90H.6 ;P1.6 Include any Watchdog refresh code here
ENDM
;
;------------------------------------------------------------------------------
;
; Far Memory Support
;
; If the C application contains variables in the far memory space that are
; initialized, you need to set the following define to 1.
;
; --- Set XBANK = 1 when far variables should be initialized
$SET (XBANK = 0)
;
;------------------------------------------------------------------------------
;
; Dallas 390/400/5240 CPU Contigious Mode
;
; If you are using the Dallas Contigious Mode you need to set the following
; define to 1.
;
; --- Set DS390 = 1 when CPU runs in Dallas Contigious Mode
$SET (DS390 = 0)
;
;------------------------------------------------------------------------------
; Standard SFR Symbols
ACC DATA 0E0H
DPL DATA 82H
DPH DATA 83H
NAME ?C_INIT
?C_C51STARTUP SEGMENT CODE
?C_INITSEG SEGMENT CODE ; Segment with Initializing Data
INIT_IorP MACRO
IorPData: ; If CY=1 PData Values
CLR A
MOVC A,@A+DPTR
INC DPTR
MOV R0,A ; Start Address
IorPLoop: CLR A
MOVC A,@A+DPTR
INC DPTR
JC PData
MOV @R0,A
SJMP Common
PData: MOVX @R0,A
Common: INC R0
DJNZ R7,IorPLoop
JMP Loop
ENDM
EXTRN CODE (MAIN)
PUBLIC ?C_START
RSEG ?C_C51STARTUP
INITEND: LJMP MAIN
$IF (XBANK = 0)
INIT_IorP
$ENDIF
Bits: CLR A
MOVC A,@A+DPTR
INC DPTR
MOV R0,A
ANL A,#007H
ADD A,#Table-LoadTab
XCH A,R0
CLR C
RLC A ; Bit Condition to Carry
SWAP A
ANL A,#00FH
ORL A,#20H ; Bit Address
XCH A,R0 ; convert to Byte Addressen
MOVC A,@A+PC
LoadTab: JC Setzen
CPL A
ANL A,@R0
SJMP BitReady
Setzen: ORL A,@R0
BitReady: MOV @R0,A
DJNZ R7,Bits
SJMP Loop
Table: DB 00000001B
DB 00000010B
DB 00000100B
DB 00001000B
DB 00010000B
DB 00100000B
DB 01000000B
DB 10000000B
?C_START:
MOV DPTR,#?C_INITSEG
Loop:
WATCHDOG
CLR A
MOV R6,#1
MOVC A,@A+DPTR
JZ INITEND
INC DPTR
MOV R7,A
ANL A,#3FH
JNB ACC.5,NOBIG
ANL A,#01FH
MOV R6,A
CLR A
MOVC A,@A+DPTR
INC DPTR
JZ NOBIG
INC R6
NOBIG: XCH A,R7
; ---- Init for far Variables
$IF (XBANK = 1)
EXTRN CODE (?C?CSTPTR)
ANL A,#0E0H
CJNE A,#0E0H,NOHDATA
;
HPTRINIT: CLR A
MOVC A,@A+DPTR
MOV R3,A
INC DPTR
CLR A
MOVC A,@A+DPTR
MOV R2,A
INC DPTR
CLR A
MOVC A,@A+DPTR
MOV R1,A
INC DPTR
HLOOP: CLR A
MOVC A,@A+DPTR
PUSH DPH
PUSH DPL
CALL ?C?CSTPTR
POP DPL
POP DPH
INC DPTR
INC R1
MOV A,R1
JNZ HINC
INC R2
HINC: DJNZ R7,HLOOP
DJNZ R6,HLOOP
SJMP Loop
NOHDATA:
$ENDIF
ANL A,#0C0H ; Typ is in Bit 6 and Bit 7
ADD A,ACC
JZ IorPData
JC Bits
XdataMem: CLR A
MOVC A,@A+DPTR
INC DPTR
MOV R2,A ; High
CLR A
MOVC A,@A+DPTR
INC DPTR
MOV R0,A ; LOW
XLoop: CLR A
MOVC A,@A+DPTR
INC DPTR
XCH A,R0
XCH A,DPL
XCH A,R0
XCH A,R2
XCH A,DPH
XCH A,R2
$IF (DS390)
DPX DATA 93H
EXTRN CODE (?C?XDATASEG)
MOV DPX,#BYTE0 (?C?XDATASEG)
$ENDIF
MOVX @DPTR,A
$IF (DS390)
EXTRN CODE (?C?CODESEG)
MOV DPX,#BYTE0 (?C?CODESEG)
$ENDIF
INC DPTR
XCH A,R0
XCH A,DPL
XCH A,R0
XCH A,R2
XCH A,DPH
XCH A,R2
DJNZ R7,XLoop
DJNZ R6,XLoop
SJMP Loop
$IF (XBANK = 1)
INIT_IorP
$ENDIF
RSEG ?C_INITSEG
DB 0
;-------------------------------------------------------------------------
; STRUCTURE OF THE INITIALIZATION INFORMATION
; -------------------------------------------
; This section describes the initialization data generated by C51 for
; explicit variable initializations (in segment ?C_INITSEC).
;
; Explicit variable initilizations at C source level are stored by C51 in
; the segment ?C_INITSEC. All partial segments are combined at linker level
; to one segment. The segment end value DB 0 is taken from this library module
; INIT.A51.
;
; Structure of the ?C_INITSEC information:
; <Info> (see below) [BYTE] ----+ repeated
; <additional info> [BYTES depend on Info] ----+ repeated
; 0x00 [BYTE] <end of list mark>
;
; <Info> has the following format:
;
; Bit 7 6 5 4 3 2 1 0
; <Info> T T B L L L L L T=Type B=BIGBIT L=LENGTH
;
; If BIGBIT is set, another LENGTH BYTE FOLLOWS. The LENGHT
; info of the first byte is then the HIGH part.
;
; Typ is one of the following:
; 0 := IDATA init values; the following bytes follow:
; - 1 byte address
; - init data bytes according LENGTH specification
;
; 1 := XDATA init values; the following bytes follow:
; - 2 byte address (high byte first)
; - init data bytes according LENGTH specification
;
; 2 := PDATA init values; the following bytes follow:
; - 1 byte address
; - init data bytes according LENGTH specification
;
; 3, BIGBIT=0 := BIT init values; the followign bytes follow:
; - 1 byte for each bit according LENGTH specification
; this byte has the following format:
;
; Bit 7 6 5 4 3 2 1 0
; I B B B B B B B I := state of the bit
; B := bit address
;
; 3, BIGBIT=1 := HDATA init values; the following bytes follow:
; - another LENGTH byte (since BIGBIT is always 1)
; - 3 byte address (MSB first)
; - data bytes according LENGTH specification
;
;----------------------------------------------------------------------
END
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