使用PIC读写1-wire EEPROM DS2430的实例程序
;--------------------------------------------------------------------
;
; 1-wire device aCCess
;DS2430
;memory function
;write scratchpad
;read scratchpad
;
;read memory :
; resource occupy by ICD2
; PROM 0x1f00 - 0x1fff
; RAM 0x70,0xf0,0x170,0x1e5~0x1f0
;--------------------------------------------------------------------
; master action
; 0xf0 + start addr(8) => scratchpad(8) --> master
; none => scratchpad(9) --> master
; none => scartchpad(a) --> master
;
; none => scratchpad(0x1f)--> master[wrap around]
; reset pulse => stop sending data
;
; 0xf0+reset pulse => EEPROM(0x00-0x1F) --> scratchpad(0x00-0x1F)
; copy scratchpad
; master
; 0x55 + 0xa5 => scratchpad(000-0x1f) --> EEPROM(0x00-0x1F)
; hELD hi for 10ms
; 0xf0 + reset pulse => copy whole from EEPROM to SCRATCHPAD
; use timer as a delay timer
;
; author : Rex Chen
; date : May,8th
; ver : 1.81
;
list p=16F877A
＃i nclude p16f877a.inc
__CONFIG _CPD_OFF & _CP_ALL & _DEBUG_ON & _BODEN_OFF & _LVP_OFF & _PWRTE_OFF & _WDT_OFF & _XT_OSC
#define OneWireDHi bsf PORTC,Bit2
#define OneWireDLo bcf PORTC,Bit2
#define CARRY STATUS,C
#define ZERO STATUS,Z
Bit0 equ H'0000'
Bit1 equ H'0001'
Bit2 equ H'0002'
Bit3 equ H'0003'
Bit4 equ H'0004'
Bit5 equ H'0005'
Bit6 equ H'0006'
Bit7 equ H'0007'
;variable defination
cbLOCk 0x20 ; RAM area 0x20- 0x7f
SYSFLAG
TxB ; Command buffer been send
TxBuffer ; data buffer been send
RxB ; Command buffer been received
TempB ; Temp Byte to roll the data
LoopCounter
Addr ; address to access BQ2430A
PBDir ; port C direction log file
PADir ; port A direction log file
Temp
ErrCode ;
W_SAVE
STATUS_SAVE
TxBuf:8 ; Tx Temp buffer
Offset
endc
;;
cblock 0xa0
SARS1
SARS2
SARS3
endc
cblock 0x100
HateSARS1
HateSARS2
HateSARS3
HateSARS4
endc
cblock 0x190
SARSISAPig0
SARSIsAPig1
SARSIsAPig2
SARSIsAPig3
SARSIsAPig4
SARSIsAPig5
endc
;---------------- SYSFLAG ----------------------------------
fTxHi equ H'0000'
fTxLo equ H'0001'
fRxMode equ H'0002'
;;
;;
;; there are 4 memory block
;; 1. EEPROM & 2. memory scratchpad
;; 3. application register
;; 4.register scratchpad
;; aliase
;;
;; memory function
;; write memory scratch
;; read memory scratch
;; copy memory scratch to EEPROM
;; read EEPROM to memory scratch
;;
WScratch equ H'0F' ; 0x0f + Addr + data + data + .+ reset pulse
; // [Master --> ScratchPad ]
RScratch equ H'AA' ; 0xaa + Addr + R + R +.. + reset pulse
; // [ScratchPad --> Master ]
CPScratch equ H'55' ; 0x55 + 0xa5 + hi 10ms // [ScratchPad --> EEPROM ]
REEROM equ H'F0' ; 0xf0 + Addr +R +R + reset pulse
; // [EEPROM(addr) --> ScratchPad]
; 0xf0 + reset pulse // [EEPROM --> ScratchPad]
;; application register , application register is OTP, there are 7 bytes
;; pay attention when you use application register , it's a 64 bit OTP
WApR equ H'99' ; 0x99 + Addr + data + data .. + reset pulse
; [Master --> Application Reg]
RStatus equ H'66' ; 0x66 + 0x00 + status + reset pulse
RApR equ H'C3' ; 0xc3 + addr + data + .. + reset pulse
; application register --> master ( locked)
; register scratchpad --> master ( not lock)
LockAp equ H'5A' ; 0x5A + 0xa5
; [ register scratchpad --> application register]
; 0x5A + reset pulse CANcel copy command
; a OTP type do once only
AppLocked equ B'11111100' ; application locked, the value is data in the status
;; ROM function command// implement skip rom only
SkipROM equ H'CC' ;access memory directly
SerachROM equ H'f0' ;read a bit , read the complement of the bit,write bit
MatchROM equ H'55' ;0x55 + 64 bit rom bit
ReadROM equ H'33' ;[family code & serial number & CRC ==> master ]
org H'00'
nop
goto main
;;ISR **
org H'04'
goto isr
isr
movwf W_SAVE ;; W_SAVE=W
swapf STATUS,W ;;
movwf STATUS_SAVE ;; STATUS_SAVE=STATUS[3:0]& STATUS[7:4]
btfss PIR1,TMR1IF ;; TMR1IF
goto exit_int_source_check
;; timer 1 service
nop
nop
nop
nop
exit_int_source_check ;; restore STATUS & W before exit from
swapf STATUS_SAVE,W ;; W=STATUS_SAVE=STATUS[3:0]& STATUS[7:4]
movwf STATUS
swapf W_SAVE,F ;; restore W
swapf W_SAVE,W
retfie
;; ISR &&&
main
call init
call init_int_en
movlw H'21'
movwf FSR
movlw H'3c'
movwf INDF ;
;-----------------------------------------------
;--------- read test --------------------------
;-----------------------------------------------
; movlw H'00'
; banksel Addr
; movwf Addr
; call RdDS2430
; movlw H'01'
; banksel Addr
; movwf Addr
; call RdDS2430
;
; movlw H'02'
; banksel Addr
; movwf Addr
; call RdDS2430
;------------------------------------------------
; banksel Offset
; clrf Offset
; pagesel VendorTable
; call VendorTable
; movwf Temp
;
;
movlw H'00'
banksel Addr
movwf Addr
movlw H'34'
banksel TxBuffer
movwf TxBuffer
call WrDS2430
movlw H'01'
banksel Addr
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