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| SDA1 EQU P3.4 ;SDA=PIN5
SCL1 EQU P3.3 ;SCL=PIN6
WTCMD EQU 10100000B ;WRITE DATA COMMAND Note 3
RDCMD EQU 10100001B ;READ DATA COMMAND Note 3
RED EQU P3.7
GREEN EQU P1.0
KEYS EQU P1
ROW1 EQU P1.1
ROW2 EQU P1.2
ROW3 EQU P1.3
ROW4 EQU P1.4
COL1 EQU P1.7
COL2 EQU P1.6
COL3 EQU P1.5
DSEG ; This is internal data memory
ORG 20H ; Bit adressable memory
KEY: DS 1
N0: DS 1
N1: DS 1
N2: DS 1
N3: DS 1
N4: DS 1
N5: DS 1
COUNT: DS 1
PASS0: DS 1
PASS1: DS 1
PASS2: DS 1
CHANGE: DS 1
CSEG ; Code begins here
; ---------==========----------==========---------=========---------
; Main routine. Program execution starts here. 8889
; ---------==========----------==========---------=========---------
ORG 00H ; Reset
MOV SP,#60H
CLR RED
CLR GREEN
CALL DELAY
CALL DELAY
SETB RED
SETB GREEN
MOV N1,#01H
MOV N2,#0FFH
MOV N3,#0FFH
MOV N4,#0FFH
MOV N5,#0FFH
MOV R3,#01H
; MOV N2,#23H
; MOV N4,#45H
; CALL SAX
KEYBOARD:
MOV KEY,#00H
SETB COL1
SETB COL2
SETB COL3
K11: CLR ROW1
CLR ROW2
CLR ROW3
CLR ROW4
MOV A,KEYS
ANL A,#11100000B
CJNE A,#11100000B,K11 ;check till all keys released
K2: ACALL DEALAY ;call 20 msec delay
MOV A,KEYS ;see if any key is pressed
ANL A,#11100000B ;mask unused bits
CJNE A,#11100000B,OVER ;key pressed, await closure
SJMP K2
OVER: ACALL DEALAY
MOV A,KEYS
ANL A,#11100000B
CJNE A,#11100000B,OVER1
SJMP K2
OVER1: MOV A,KEYS
ORL A,#11111110B
MOV KEYS,A
CLR ROW1
MOV A,KEYS
ANL A,#11100000B
CJNE A,#11100000B,ROW_1
MOV A,KEYS
ORL A,#11111110B
MOV KEYS,A
CLR ROW2
MOV A,KEYS
ANL A,#11100000B
CJNE A,#11100000B,ROW_2
MOV A,KEYS
ORL A,#11111110B
MOV KEYS,A
CLR ROW3
MOV A,KEYS
ANL A,#11100000B
CJNE A,#11100000B,ROW_3
MOV A,KEYS
ORL A,#11111110B
MOV KEYS,A
CLR ROW4
MOV A,KEYS
ANL A,#11100000B
CJNE A,#11100000B,ROW_4
LJMP K2
ROW_1: RLC A
JC MAT1
MOV KEY,#01H
AJMP K1
MAT1: RLC A
JC MAT2
MOV KEY,#02H
AJMP K1
MAT2: RLC A
JC K1
MOV KEY,#03H
AJMP K1
ROW_2: RLC A
JC MAT3
MOV KEY,#04H
AJMP K1
MAT3: RLC A
JC MAT4
MOV KEY,#05H
AJMP K1
MAT4: RLC A
JC K1
MOV KEY,#06H
AJMP K1
ROW_3: RLC A
JC MAT5
MOV KEY,#07H
AJMP K1
MAT5: RLC A
JC MAT6
MOV KEY,#08H
AJMP K1
MAT6: RLC A
JC K1
MOV KEY,#09H
AJMP K1
ROW_4: RLC A
JC MAT7
MOV KEY,#0AH
AJMP K1
MAT7: RLC A
JC MAT8
MOV KEY,#00H ;for 0
AJMP K1
MAT8: RLC A
JC K1
MOV KEY,#0FH
K1:
CLR RED
CALL DELAY
CALL DELAY
SETB RED
MOV A,KEY
CJNE A,#0FH,G0
CJNE R3,#07H,G0
AJMP G8
G0: CJNE R3,#01H,G11
INC R3
MOV N0,KEY
AJMP KEYBOARD
G11: CJNE R3,#02H,G1
INC R3
MOV N1,KEY
AJMP KEYBOARD
G1: CJNE R3,#03H,G2
INC R3
MOV N2,KEY
AJMP KEYBOARD
G2: CJNE R3,#04H,G3
INC R3
MOV N3,KEY
AJMP KEYBOARD
G3: CJNE R3,#05H,G4
INC R3
MOV N4,KEY
AJMP KEYBOARD
G4: CJNE R3,#06H,G5
INC R3
MOV N5,KEY
G5: AJMP KEYBOARD
G8:
MOV A,N2
SWAP A
ORL A,N3
MOV N2,A ;HIGHER DIGITSS IN N2
MOV A,N4
SWAP A
ORL A,N5
MOV N3,A ;LOWER DISITS IN N3
MOV A,N0
CJNE A,#01H,STR_AMT
MOV N1,#00H
MOV R1,#N1 ;store COUNT
MOV R4,#20H ;Starting Address IN EEPROM
MOV R6,#3 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
CALL DELAY
AJMP CHK_DATA
BV1S: AJMP BV1
STR_AMT:
CJNE A,#02H,BV1S
MOV N1,#01H
MOV R1,#N1 ;store COUNT
MOV R4,#20H ;Starting Address IN EEPROM
MOV R6,#3 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
CALL DELAY
; ---------==========----------==========---------=========---------
;CHECK WITH DATA STORED IN MEMORY
; ---------==========----------==========---------=========---------
CHK_DATA:
MOV R1,#PASS0 ;GET DATA IN BYTES(RAM)
MOV R4,#20H ;DATA ADDRESS IN EEPROM
MOV R6,#3 ;NUMBER OF BYTES
CALL READ_EEPROM
MOV A,N1
CJNE A,PASS0, BV1
MOV A,N2
CJNE A,PASS1,BV1
MOV A,N3
CJNE A,PASS2,BV1
CLR GREEN
CALL DELAY1
CALL DELAY1
SETB GREEN
CALL DELAY1
CALL DELAY1
CLR GREEN
CALL DELAY1
CALL DELAY1
SETB GREEN
MOV R3,#01H
MOV N0,#0FFH
MOV N1,#0FFH
MOV N2,#0FFH
MOV N3,#0FFH
MOV N4,#0FFH
MOV N5,#0FFH
AJMP KEYBOARD
BV1: CLR RED
CALL DELAY1
CALL DELAY1
SETB RED
CALL DELAY1
CALL DELAY1
CLR RED
CALL DELAY1
CALL DELAY1
SETB RED
MOV R3,#01H
MOV N0,#0FFH
MOV N1,#0FFH
MOV N2,#0FFH
MOV N3,#0FFH
MOV N4,#0FFH
MOV N5,#0FFH
AJMP KEYBOARD
;((((((((((((((((((((((((((((((((
DEALAY:
MOV R1,#50
REPP2: NOP
DJNZ R1,REPP2
RET
;((((((((((((((((((((((((((((((((
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
; READ DATA FROM EEPROM
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
READ_EEPROM:
MOV A,#WTCMD ;LOAD WRITE COMMAND TO SEND ADDRESS
CALL OUTS ;SEND IT
MOV A,R4 ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
MOV A,#RDCMD ;LOAD READ COMMAND
CALL OUTS ;SEND IT
BRDLP: CALL IN ;READ DATA
MOV @R1,a ;STORE DATA
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,AKLP ;DECREMENT LOOP COUNTER
CALL STOP ;IF DONE, ISSUE STOP CONDITION
RET ;DONE, EXIT ROUTINE
AKLP: CLR SDA1 ;NOT DONE, ISSUE ACK
SETB SCL1
NOP ;NOTE 1
NOP
NOP
NOP ;NOTE 2
NOP
CLR SCL1
JMP BRDLP ;CONTINUE WITH READS
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
; STORE DATA IN EEPROM
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
STORE_EEPROM:
MOV A,#WTCMD ;LOAD WRITE COMMAND
CALL OUTS ;SEND IT
MOV A,R4 ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
BTLP: MOV A,@R1 ;GET DATA
CALL OUT ;SEND IT
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,BTLP ;LOOP TILL DONE
CALL STOP ;SEND STOP CONDITION
RET
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
;***********************************************************************
; THIS ROUTINE SENDS OUT CONTENTS OF THE ACCUMULATOR
; to the EEPROM and includes START condition. Refer to the data sheets
; for discussion of START and STOP conditions.
;***********************************************************************
OUTS: MOV R2,#8 ;LOOP COUNT -- EQUAL TO BIT COUNT
SETB SDA1 ;INSURE DATA IS HI
SETB SCL1 ;INSURE CLOCK IS HI
NOP ;NOTE 1
NOP
NOP
CLR SDA1 ;START CONDITION -- DATA = 0
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK = 0
OTSLP: RLC A ;SHIFT BIT
JNC BITLS
SETB SDA1 ;DATA = 1
JMP OTSL1 ;CONTINUE
BITLS: CLR SDA1 ;DATA = 0
OTSL1: SETB SCL1 ;CLOCK HI
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK LOW
DJNZ R2,OTSLP ;DECREMENT COUNTER
SETB SDA1 ;TURN PIN INTO INPUT
NOP ;NOTE 1
SETB SCL1 ;CLOCK ACK
NOP ;NOTE 1
NOP
NOP
CLR SCL1
RET
;**********************************************************************
; THIS ROUTINE SENDS OUT CONTENTS OF ACCUMLATOR TO EEPROM
; without sending a START condition.
;**********************************************************************
OUT: MOV R2,#8 ;LOOP COUNT -- EQUAL TO BIT COUNT
OTLP: RLC A ;SHIFT BIT
JNC BITL
SETB SDA1 ;DATA = 1
JMP OTL1 ;CONTINUE
BITL: CLR SDA1 ;DATA = 0
OTL1: SETB SCL1 ;CLOCK HI
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK LOW
DJNZ R2,OTLP ;DECREMENT COUNTER
SETB SDA1 ;TURN PIN INTO INPUT
NOP ;NOTE 1
SETB SCL1 ;CLOCK ACK
NOP ;NOTE 1
NOP
NOP
CLR SCL1
RET
STOP: CLR SDA1 ;STOP CONDITION SET DATA LOW
NOP ;NOTE 1
NOP
NOP
SETB SCL1 ;SET CLOCK HI
NOP ;NOTE 1
NOP
NOP
SETB SDA1 ;SET DATA HIGH
RET
;*******************************************************************
; THIS ROUTINE READS A BYTE OF DATA FROM EEPROM
; From EEPROM current address pointer.
; Returns the data byte in R1
;*******************************************************************
CREAD: MOV A,#RDCMD ;LOAD READ COMMAND
CALL OUTS ;SEND IT
CALL IN ;READ DATA
MOV R1,A ;STORE DATA
CALL STOP ;SEND STOP CONDITION
RET
;**********************************************************************
; THIS ROUTINE READS IN A BYTE FROM THE EEPROM
; and stores it in the accumulator
;**********************************************************************
IN: MOV R2,#8 ;LOOP COUNT
SETB SDA1 ;SET DATA BIT HIGH FOR INPUT
INLP: CLR SCL1 ;CLOCK LOW
NOP ;NOTE 1
NOP
NOP
NOP
SETB SCL1 ;CLOCK HIGH
CLR C ;CLEAR CARRY
JNB SDA1,INL1 ;JUMP IF DATA = 0
CPL C ;SET CARRY IF DATA = 1
INL1: RLC A ;ROTATE DATA INTO ACCUMULATOR
DJNZ R2,INLP ;DECREMENT COUNTER
CLR SCL1 ;CLOCK LOW
RET
;*********************************************************************
; This routine test for WRITE DONE condition
; by testing for an ACK.
; This routine can be run as soon as a STOP condition
; has been generated after the last data byte has been sent
; to the EEPROM. The routine loops until an ACK is received from
; the EEPROM. No ACK will be received until the EEPROM is done with
; the write operation.
;*********************************************************************
ACKTST: MOV A,#WTCMD ;LOAD WRITE COMMAND TO SEND ADDRESS
MOV R2,#8 ;LOOP COUNT -- EQUAL TO BIT COUNT
CLR SDA1 ;START CONDITION -- DATA = 0
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK = 0
AKTLP: RLC A ;SHIFT BIT
JNC AKTLS
SETB SDA1 ;DATA = 1
JMP AKTL1 ;CONTINUE
AKTLS: CLR SDA1 ;DATA = 0
AKTL1: SETB SCL1 ;CLOCK HI
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK LOW
DJNZ R2,AKTLP ;DECREMENT COUNTER
SETB SDA1 ;TURN PIN INTO INPUT
NOP ;NOTE 1
SETB SCL1 ;CLOCK ACK
NOP ;NOTE 1
NOP
NOP
JNB SDA1,EXIT ;EXIT IF ACK (WRITE DONE)
JMP ACKTST ;START OVER
EXIT: CLR SCL1 ;CLOCK LOW
CLR SDA1 ;DATA LOW
NOP ;NOTE 1
NOP
NOP
SETB SCL1 ;CLOCK HIGH
NOP
NOP
SETB SDA1 ;STOP CONDITION
RET
;*********************************************************************
DELAY: MOV R0,#0FFH
INLOP: MOV R1,#0FFH
DJNZ R1,$
DJNZ R0,INLOP
RET
DELAY1: MOV R0,#0FFH
INLOP1: MOV R1,#0FFH
DJNZ R1,$
DJNZ R0,INLOP1
RET
END
(13.)PRE-PAID ENERGY METER PROGRAMMING:-
RB0 EQU 000H ; Select Register Bank 0
RB1 EQU 008H ; Select Register Bank 1 ...poke to PSW to use
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
; PORT DECLERATION
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
SDA1 EQU P2.1 ;SDA=PIN5
SCL1 EQU P2.0 ;SCL=PIN6
WTCMD EQU 10100110B ;WRITE DATA COMMAND Note 3
RDCMD EQU 10100111B ;READ DATA COMMAND Note 3
WTCMD1 EQU 10100000B ;WRITE DATA COMMAND Note 3
RDCMD1 EQU 10100001B ;READ DATA COMMAND Note 3
RELAY EQU P2.7
BUZZER EQU P2.4
; ***LCD CONTROL***
LCD_RS EQU P0.0 ;LCD REGISTER SELECT LINE
LCD_E EQU P0.1 ;LCD ENABLE LINE
LCD_DB4 EQU P0.2 ;PORT 1 IS USED FOR DATA
LCD_DB5 EQU P0.3 ;USED FOR DATA
LCD_DB6 EQU P0.4 ;FOR DATA
LCD_DB7 EQU P0.5 ;FOR DATA
; ***CURSOR CONTROL INSTRUCTIONS***
OFFCUR EQU 0CH
BLINKCUR EQU 0DH
; ***DISPLAY CONTROL INSTRUCTIONS***
CLRDSP EQU 01H
ONDSP EQU 0CH
; ***SYSTEM INSTRUCTIONS***
CONFIG EQU 28H ; 4-BIT DATA,2 LINES,5X7 MATRIX LCD
ENTRYMODE EQU 6 ; INCREMENT CURSOR DON'T SHIFT DISPLAY
DSEG ; This is internal data memory
ORG 20H ; Bit adressable memory
FLAGS1: DS 1
BCDCARRY BIT FLAGS1.0
CARRY BIT FLAGS1.1
TBIT BIT FLAGS1.2
TBIT1 BIT FLAGS1.3
READING: DS 2
AMOUNT: DS 3
COUNTER: DS 2
TEMP: DS 1
PRICE: DS 2
BALANCE: DS 1
BUZZ_COUNT: DS 1
READ_BYTE: DS 3
F1: DS 1
F2: DS 1
F3: DS 1
STACK: DS 1
CSEG ; Code begins here
; ---------==========----------==========---------=========---------
; Main routine. Program execution starts here.
; ---------==========----------==========---------=========---------
ORG 00H ; Reset
AJMP MAIN
ORG 0003H
PUSH PSW
PUSH ACC
MOV PSW,#RB1 ; Select register bank 0
CALL INC_COUNTER
POP ACC
POP PSW
RETI
; ---------==========----------==========---------=========---------
MAIN:
MOV SP,#50H
MOV PSW,#RB0 ; Select register bank 0
MOV IE,#10000001B
CALL RESETLCD4
CALL TITLE1
CLR BUZZER
SETB RELAY
CLR TBIT1
MOV BUZZ_COUNT,#00H
MOV READ_BYTE,#0FFH
CALL READ_COUNTER
MOV A,COUNTER
CJNE A,#0FFH,BYPASS
CALL RESET_READING
CALL RESET_AMT
CALL RESET_COUNTER
CALL RESET_PRICE
CALL RESET_BALANCE ;RELAY ON/OFF BYTE
; CALL STORE_UNIT_PRICE
; CALL AMT_RECHARGE
CALL SYSTEM_RESET
CALL DELAYYS
BYPASS:
CALL READ_COUNTER
CALL READ_PRICE
CALL READ_BALANCE
MAINS: CALL TITLE1
CALL DELAYY
MOV A,BALANCE
CJNE A,#00H,FG1
CLR RELAY
CALL RECHAGRE
CALL DELAYY
SETB BUZZER
AJMP MAINS
FG1: SETB RELAY
MOV A,BUZZ_COUNT ;CHK TO SWITCH OFF THE BUZZER
CJNE A,#00H,AZX1
CLR BUZZER
AJMP AZX2
AZX1: DEC BUZZ_COUNT
AZX2:
MOV R1,#READING ;GET DATA IN BYTES(RAM)
MOV R4,#05H ;DATA ADDRESS IN EEPROM
MOV R6,#2 ;NUMBER OF BYTES
CALL READ_EEPROM
CALL DISP_READING
MOV TEMP,READING
CALL SEP_DISP
MOV TEMP,READING+1
CALL SEP_DISP
CALL DELAYY
MOV R1,#AMOUNT ;GET DATA IN BYTES(RAM)
MOV R4,#0AH ;DATA ADDRESS IN EEPROM
MOV R6,#3 ;NUMBER OF BYTES
CALL READ_EEPROM
CALL AMT_READING
MOV TEMP,AMOUNT
CALL SEP_DISP
MOV TEMP,AMOUNT+1
CALL SEP_DISP
MOV R4,#'.'
CALL WRLCDDATA
CALL MDELAY
MOV TEMP,AMOUNT+2
CALL SEP_DISP
CALL DELAYY
MOV R1,#COUNTER ;GET DATA IN BYTES(RAM)
MOV R4,#0EH ;DATA ADDRESS IN EEPROM
MOV R6,#2 ;NUMBER OF BYTES
CALL READ_EEPROM
CALL COUNT_READING
MOV TEMP,COUNTER
CALL SEP_DISP
MOV TEMP,COUNTER+1
CALL SEP_DISP
CALL DELAYY
MOV R1,#PRICE ;GET DATA IN BYTES(RAM)
MOV R4,#10H ;DATA ADDRESS IN EEPROM
MOV R6,#2 ;NUMBER OF BYTES
CALL READ_EEPROM
CALL READ_PRICE
CALL UNIT_PRICE
MOV A,PRICE
ADD A,#30h
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
MOV R4,#'.'
CALL WRLCDDATA
CALL MDELAY
MOV TEMP,PRICE+1
CALL SEP_DISP
CALL DELAYY
AJMP MAINS
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
; INCREMENT COUNTER BY 1
; IF COUNT=3200 THEN INCREMENT READING
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
INC_COUNTER:
MOV A,COUNTER+1
ADD A,#01
DA A
MOV COUNTER+1,A
JNC DCV2
MOV A,COUNTER
ADD A,#01
DA A
MOV COUNTER,A
CJNE A,#32h,DCV2
MOV COUNTER,#00H
MOV COUNTER+1,#00H
MOV R1,#COUNTER ;store COUNT
MOV R4,#0EH ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
AJMP DVB1
DCV2: MOV R1,#COUNTER ;store COUNT
MOV R4,#0EH ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
RET
DVB1: MOV A,READING+1 ;INCREMENT READING BY 1
ADD A,#01
DA A
MOV READING+1,A
JNC DCS1
MOV A,READING
ADD A,#01
DA A
MOV READING,A
DCS1: MOV R1,#READING ;store READING
MOV R4,#05H ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
MOV A,AMOUNT+2 ;SUBTRACT AMT0 FROM TOTAL0
CLR C
SUBB A,PRICE+1
CALL BCD_CONV
MOV AMOUNT+2,A
MOV A,AMOUNT+1 ;SUBTRACT AMT1 FROM TOTAL1
SUBB A,PRICE
CALL BCD_CONV
MOV AMOUNT+1,A
MOV A,AMOUNT ;SUBTRACT AMT2 FROM TOTAL2
SUBB A,#00h
CALL BCD_CONV
MOV AMOUNT,A
MOV R1,#AMOUNT ;store AMOUNT
MOV R4,#0AH ;Starting Address IN EEPROM
MOV R6,#3 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
MOV A,AMOUNT+1
CJNE A,#40H,FCX1
MOV BUZZ_COUNT,#02H
SETB BUZZER
FCX1: CJNE A,#38H,FAX1
MOV BUZZ_COUNT,#02H
SETB BUZZER
FAX1: CJNE A,#41H,FAAX1
MOV BUZZ_COUNT,#02H
SETB BUZZER
FAAX1: CJNE A,#20H,FCX2
MOV BUZZ_COUNT,#03H
SETB BUZZER
FCX2: CJNE A,#19H,FAX2
MOV BUZZ_COUNT,#03H
SETB BUZZER
FAX2: CJNE A,#21H,FAAX2
MOV BUZZ_COUNT,#03H
SETB BUZZER
FAAX2: CJNE A,#10H,FCX3
MOV BUZZ_COUNT,#04H
SETB BUZZER
FCX3: CJNE A,#11H,FCX4
MOV BUZZ_COUNT,#04H
SETB BUZZER
FCX4: CJNE A,#09H,FAX4
MOV BUZZ_COUNT,#04H
SETB BUZZER
FAX4:
MOV A,AMOUNT+2 ;SUBTRACT AMT0 FROM TOTAL0
CLR C
SUBB A,PRICE+1
CALL BCD_CONV
MOV A,AMOUNT+1 ;SUBTRACT AMT1 FROM TOTAL1
SUBB A,PRICE
MOV A,AMOUNT
CLR TBIT
JNC POP1
SETB TBIT
POP1: CJNE A,#00H,BACK
JNB TBIT, BACK
MOV BALANCE,#00H
MOV R1,#BALANCE ;store COUNT
MOV R4,#15H ;Starting Address IN EEPROM
MOV R6,#1 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
CLR RELAY
SETB BUZZER
BACK: RET
;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
BCD_CONV:
CLR BCDCARRY
CLR CARRY
JNC LOP2
SETB CARRY
LOP2: JNB AC,LOP1
SETB BCDCARRY
CLR C
SUBB A,#06H
LOP1: JNB CARRY,LOP3
CLR C
SUBB A,#60H
LOP3: CLR C
JNB CARRY,LOP4
SETB C
LOP4: RET
;#################################################
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
; READ PULSE COUNTER FROM MEMORY
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
READ_BALANCE:
MOV R1,#BALANCE ;GET DATA IN BYTES(RAM)
MOV R4,#15H ;DATA ADDRESS IN EEPROM
MOV R6,#1 ;NUMBER OF BYTES
CALL READ_EEPROM
RET
READ_COUNTER:
MOV R1,#COUNTER ;GET DATA IN BYTES(RAM)
MOV R4,#0EH ;DATA ADDRESS IN EEPROM
MOV R6,#2 ;NUMBER OF BYTES
CALL READ_EEPROM
RET
READ_PRICE:
MOV R1,#PRICE ;GET DATA IN BYTES(RAM)
MOV R4,#10H ;DATA ADDRESS IN EEPROM
MOV R6,#2 ;NUMBER OF BYTES
CALL READ_EEPROM
RET
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
SEP_DISP1:
MOV A,AMOUNT
ANL A,#0F0H
SWAP A
CJNE A,#00H,DAP1
MOV A,AMOUNT
ANL A,#0FH
AJMP DAP3
DAP1: ADD A,#30H ;BOTH NOT EQUAL TO ZERO
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
DAP2: MOV A,AMOUNT
ANL A,#0FH
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
DAP4: MOV A,AMOUNT+1
ANL A,#0F0H
SWAP A
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
DAP5: MOV A,AMOUNT+1
ANL A,#0FH
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
MOV R4,#'.'
CALL WRLCDDATA
CALL MDELAY
MOV A,AMOUNT+2
ANL A,#0F0H
SWAP A
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
MOV A,AMOUNT+2
ANL A,#0FH
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
RET
DAP3: CJNE A,#00H,DAP2 ;CHK 2 DIGIT
MOV A,AMOUNT+1
ANL A,#0F0H
SWAP A
CJNE A,#00H,DAP4 ;CHK 3 DIGIT
AJMP DAP5
SEP_DISP:
MOV A,TEMP
ANL A,#0F0H
SWAP A
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
MOV A,TEMP
ANL A,#0FH
ADD A,#30H
MOV R4,A
CALL WRLCDDATA
CALL MDELAY
RET
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
AMT_RECHARGE:
MOV READ_BYTE,#01H
MOV READ_BYTE+1,#00H
MOV READ_BYTE+2,#10H
MOV R1,#READ_BYTE ;store COUNT
MOV R6,#3 ;STORE 2 BYTES
MOV A,#WTCMD1 ;LOAD WRITE COMMAND
CALL OUTS ;SEND IT
MOV A,#20H ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
BXLP: MOV A,@R1 ;GET DATA
CALL OUT ;SEND IT
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,BXLP ;LOOP TILL DONE
CALL STOP ;SEND STOP CONDITION
CALL DELAY
RET
STORE_UNIT_PRICE:
MOV READ_BYTE,#00H
MOV READ_BYTE+1,#01H
MOV READ_BYTE+2,#00H
MOV R1,#READ_BYTE ;store COUNT
MOV R6,#3 ;STORE 2 BYTES
MOV A,#WTCMD1 ;LOAD WRITE COMMAND
CALL OUTS ;SEND IT
MOV A,#20H ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
BALP: MOV A,@R1 ;GET DATA
CALL OUT ;SEND IT
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,BALP ;LOOP TILL DONE
CALL STOP ;SEND STOP CONDITION
CALL DELAY
RET
RESET_BALANCE:
MOV BALANCE,#0FFH
MOV R1,#BALANCE ;store COUNT
MOV R4,#15H ;Starting Address IN EEPROM
MOV R6,#1 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
RET
RESET_PRICE:
MOV PRICE,#02H
MOV PRICE+1,#00H
MOV R1,#PRICE ;store COUNT
MOV R4,#10H ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
RET
RESET_COUNTER:
MOV COUNTER,#00H
MOV COUNTER+1,#10H
MOV R1,#COUNTER ;store COUNT
MOV R4,#0EH ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
RET
RESET_AMT:
MOV AMOUNT,#00H ;
MOV AMOUNT+1,#05H
MOV AMOUNT+2,#00H
MOV R1,#AMOUNT ;store READING
MOV R4,#0AH ;Starting Address IN EEPROM
MOV R6,#3 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
RET
RESET_READING:
MOV READING,#00H
MOV READING+1,#05H
MOV R1,#READING ;store READING
MOV R4,#05H ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAY
RET
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DELAYY:
MOV F1,#0FH
SEP3: MOV F2,#0fFH
SEP2: MOV F3,#0FFH
SEP1: DJNZ F3,SEP1
DJNZ F2,SEP2
CALL CARD_READ
MOV A,READ_BYTE
CJNE A,#0FFH,DSP1
CLR TBIT1
DSP3A:DJNZ F1,SEP3
RET
DELAYYS:
MOV F1,#0FH
S5P3: MOV F2,#0fFH
S5P2: MOV F3,#0FFH
S5P1: DJNZ F3,S5P1
DJNZ F2,S5P2
DJNZ F1,S5P3
RET
DSP1: JB TBIT1,DSP3A
CALL TITLE3
CALL DELAYS
CALL DELAYS
CALL CARD_READ
MOV A,READ_BYTE
CJNE A,#00H,DSP2
CALL TITLE4 ; NEW UNIT PRICE
MOV PRICE,READ_BYTE+1
MOV PRICE+1,READ_BYTE+2
MOV R1,#PRICE ;store COUNT
MOV R4,#10H ;Starting Address IN EEPROM
MOV R6,#2 ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAYS
SETB TBIT1
AJMP RESETX_CHIP
DSP2: CJNE A,#01H,DSP3
CALL TITLE5 ; NEW RECHARGE
; MOV R1,#AMOUNT ;GET DATA IN BYTES(RAM)
; MOV R4,#0AH ;DATA ADDRESS IN EEPROM
; MOV R6,#03h ;NUMBER OF BYTES
; CALL READ_EEPROM
MOV A,AMOUNT
ADD A,READ_BYTE+1
DA A
MOV AMOUNT,A
MOV A,AMOUNT+1
ADDC A,READ_BYTE+2
DA A
MOV AMOUNT+1,A
MOV R1,#AMOUNT ;store READING
MOV R4,#0AH ;Starting Address IN EEPROM
MOV R6,#03h ;STORE 2 BYTES
CALL STORE_EEPROM
CALL DELAYS
SETB TBIT1
CALL RESET_BALANCE
RESETX_CHIP:
MOV READ_BYTE,#0AAH ;ERASE AMOUNT
MOV READ_BYTE+1,#0FFH
MOV READ_BYTE+2,#0FFH
MOV R1,#READ_BYTE ;store COUNT
MOV R6,#3 ;STORE 2 BYTES
MOV A,#WTCMD1 ;LOAD WRITE COMMAND
CALL OUTS ;SEND IT
MOV A,#20H ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
BBLP: MOV A,@R1 ;GET DATA
CALL OUT ;SEND IT
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,BBLP ;LOOP TILL DONE
CALL STOP ;SEND STOP CONDITION
CALL DELAY
RET
DSP3: CJNE A,#0AAH,DSP4
CALL TITLE6 ; NEW RECHARGE
CALL DELAYS
SETB TBIT1
DSP4: RET
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DELAY:
MOV R6,#0FFH
RE1: MOV R7,#0FFH
RE: NOP
DJNZ R7,RE
DJNZ R6,RE1
RET
;**********************************************************
CARD_READ:
MOV R1,#READ_BYTE ;GET DATA IN BYTES(RAM)
MOV R6,#3 ;NUMBER OF BYTES
MOV A,#WTCMD1 ;LOAD WRITE COMMAND TO SEND ADDRESS
CALL OUTS ;SEND IT
MOV A,#20H ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
MOV A,#RDCMD1 ;LOAD READ COMMAND
CALL OUTS ;SEND IT
BXDLP: CALL IN ;READ DATA
MOV @R1,a ;STORE DATA
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,AXLP ;DECREMENT LOOP COUNTER
CALL STOP ;IF DONE, ISSUE STOP CONDITION
RET ;DONE, EXIT ROUTINE
AXLP: CLR SDA1 ;NOT DONE, ISSUE ACK
SETB SCL1
NOP ;NOTE 1
NOP
NOP
NOP ;NOTE 2
NOP
CLR SCL1
JMP BXDLP ;CONTINUE WITH READS
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
; READ DATA FROM EEPROM
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
READ_EEPROM:
MOV A,#WTCMD ;LOAD WRITE COMMAND TO SEND ADDRESS
CALL OUTS ;SEND IT
MOV A,R4 ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
MOV A,#RDCMD ;LOAD READ COMMAND
CALL OUTS ;SEND IT
BRDLP: CALL IN ;READ DATA
MOV @R1,a ;STORE DATA
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,AKLP ;DECREMENT LOOP COUNTER
CALL STOP ;IF DONE, ISSUE STOP CONDITION
RET ;DONE, EXIT ROUTINE
AKLP: CLR SDA1 ;NOT DONE, ISSUE ACK
SETB SCL1
NOP ;NOTE 1
NOP
NOP
NOP ;NOTE 2
NOP
CLR SCL1
JMP BRDLP ;CONTINUE WITH READS
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
; STORE DATA IN EEPROM
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
STORE_EEPROM:
MOV A,#WTCMD ;LOAD WRITE COMMAND
CALL OUTS ;SEND IT
MOV A,R4 ;GET LOW BYTE ADDRESS
CALL OUT ;SEND IT
BTLP: MOV A,@R1 ;GET DATA
CALL OUT ;SEND IT
INC R1 ;INCREMENT DATA POINTER
DJNZ R6,BTLP ;LOOP TILL DONE
CALL STOP ;SEND STOP CONDITION
RET
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
;##########################################################
; DISPLAY ROUTINES
;##########################################################
TITLE1:
MOV DPTR,#MSAG1
CALL LCD_MSG
RET
MSAG1:
DB 1H,84H,'PREPAID',0C2H,'ENERGY METER',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DISP_READING:
MOV DPTR,#MSAG2
CALL LCD_MSG
RET
MSAG2:
DB 1H,82H,'METER READING',0C6H,00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AMT_READING:
MOV DPTR,#MSAG3
CALL LCD_MSG
RET
MSAG3:
DB 1H,81H,'BALANCE AMOUNT',0C3H,'Rs.',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COUNT_READING:
MOV DPTR,#MSAG4
CALL LCD_MSG
RET
MSAG4:
DB 1H,82H,'PULSE COUNT',0C6H,00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
UNIT_PRICE:
MOV DPTR,#MSAG14
CALL LCD_MSG
RET
MSAG14:
DB 1H,83H,'UNIT PRICE',0C4H,'Rs ',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
RECHAGRE:
MOV DPTR,#MSAG5
CALL LCD_MSG
RET
MSAG5:
DB 1H,80H,'Please Recharge',0C2H,'your Account',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TITLE3:
MOV DPTR,#MSAG6
CALL LCD_MSG
RET
MSAG6:
DB 1H,84H,'New Card',0C1H,'** DETECTED **',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TITLE4:
MOV DPTR,#MSAG7
CALL LCD_MSG
RET
MSAG7:
DB 1H,81H,'NEW UNIT PRICE',0C1H,'** STORED **',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TITLE5:
MOV DPTR,#MSAG8
CALL LCD_MSG
RET
MSAG8:
DB 1H,83H,'NEW AMOUNT',0C1H,'** RECHARGED **',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TITLE6:
MOV DPTR,#MSAG9
CALL LCD_MSG
RET
MSAG9:
DB 1H,82H,'INVALID CARD',0C0H,'****************',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SYSTEM_RESET:
MOV DPTR,#MSAG91
CALL LCD_MSG
RET
MSAG91:
DB 1H,80H,'System Restored',0C0H,'****************',00H
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
;**********************************************************
; INITIALIZE THE LCD 4-BIT MODE
;**********************************************************
INITLCD4:
CLR LCD_RS ; LCD REGISTER SELECT LINE
CLR LCD_E ; ENABLE LINE
MOV R4, #CONFIG; FUNCTION SET - DATA BITS,
; LINES, FONTS
CALL WRLCDCOM4
MOV R4, #ONDSP ; DISPLAY ON
CALL WRLCDCOM4
MOV R4, #ENTRYMODE ; SET ENTRY MODE
CALL WRLCDCOM4 ; INCREMENT CURSOR RIGHT, NO SHIFT
MOV R4, #CLRDSP; CLEAR DISPLAY, HOME CURSOR
CALL WRLCDCOM4
RET
; **********************************************************
; SOFTWARE VERSION OF THE POWER ON RESET
; **********************************************************
RESETLCD4:
CLR LCD_RS ; LCD REGISTER SELECT LINE
CLR LCD_E ; ENABLE LINE
CLR LCD_DB7 ; SET BIT PATTERN FOR...
CLR LCD_DB6 ; ... POWER-ON-RESET
SETB LCD_DB5
SETB LCD_DB4
SETB LCD_E ; START ENABLE PULSE
CLR LCD_E ; END ENABLE PULSE
MOV A, #4 ; DELAY 4 MILLISECONDS
CALL MDELAY
SETB LCD_E ; START ENABLE PULSE
CLR LCD_E ; END ENABLE PULSE
MOV A, #1 ; DELAY 1 MILLISECOND
CALL MDELAY
SETB LCD_E ; START ENABLE PULSE
CLR LCD_E ; END ENABLE PULSE
MOV A, #1 ; DELAY 1 MILLISECOND
CALL MDELAY
CLR LCD_DB4 ; SPECIFY 4-BIT OPERATION
SETB LCD_E ; START ENABLE PULSE
CLR LCD_E ; END ENABLE PULSE
MOV A, #1 ; DELAY 1 MILLISECOND
CALL MDELAY
MOV R4, #CONFIG; FUNCTION SET
CALL WRLCDCOM4
MOV R4, #08H ; DISPLAY OFF
CALL WRLCDCOM4
MOV R4, #1 ; CLEAR DISPLAY, HOME CURSOR
CALL WRLCDCOM4
MOV R4,#ENTRYMODE ; SET ENTRY MODE
ACALL WRLCDCOM4
JMP INITLCD4
; **********************************************************
; SUB RECEIVES A COMMAND WORD TO THE LCD
; COMMAND MUST BE PLACED IN R4 BY CALLING PROGRAM
; **********************************************************
WRLCDCOM4:
CLR LCD_E
CLR LCD_RS ; SELECT READ COMMAND
PUSH ACC ; SAVE ACCUMULATOR
MOV A, R4 ; PUT DATA BYTE IN ACC
MOV C, ACC.4 ; LOAD HIGH NIBBLE ON DATA BUS
MOV LCD_DB4, C ; ONE BIT AT A TIME USING...
MOV C, ACC.5 ; BIT MOVE OPERATOINS
MOV LCD_DB5, C
MOV C, ACC.6
MOV LCD_DB6, C
MOV C, ACC.7
MOV LCD_DB7, C
SETB LCD_E ; PULSE THE ENABLE LINE
CLR LCD_E
MOV C, ACC.0 ; SIMILARLY, LOAD LOW NIBBLE
MOV LCD_DB4, C
MOV C, ACC.1
MOV LCD_DB5, C
MOV C, ACC.2
MOV LCD_DB6, C
MOV C, ACC.3
MOV LCD_DB7, C
CLR LCD_E
SETB LCD_E ; PULSE THE ENABLE LINE
CLR LCD_E
CALL MADELAY
POP ACC
RET
; **********************************************************
; SUB TO RECEIVE A DATA WORD TO THE LCD
; DATA MUST BE PLACED IN R4 BY CALLING PROGRAM
; **********************************************************
WRLCDDATA:
CLR LCD_E
SETB LCD_RS ; SELECT READ DATA
PUSH ACC ; SAVE ACCUMULATOR
MOV A, R4 ; PUT DATA BYTE IN ACC
MOV C, ACC.4 ; LOAD HIGH NIBBLE ON DATA BUS
MOV LCD_DB4, C ; ONE BIT AT A TIME USING...
MOV C, ACC.5 ; BIT MOVE OPERATOINS
MOV LCD_DB5, C
MOV C, ACC.6
MOV LCD_DB6, C
MOV C, ACC.7
MOV LCD_DB7, C
SETB LCD_E ; PULSE THE ENABLE LINE
CLR LCD_E
MOV C, ACC.0 ; SIMILARLY, LOAD LOW NIBBLE
MOV LCD_DB4, C
MOV C, ACC.1
MOV LCD_DB5, C
MOV C, ACC.2
MOV LCD_DB6, C
MOV C, ACC.3
MOV LCD_DB7, C
CLR LCD_E
SETB LCD_E ; PULSE THE ENABLE LINE
CLR LCD_E
NOP
NOP
POP ACC
RET
; **********************************************************
; SUB TAKES THE STRING IMMEDIATELY FOLLOWING THE CALL AND
; DISPLAYS ON THE LCD. STRING MUST BE TERMINATED WITH A
; NULL (0).
; **********************************************************
LCD_MSG:
CLR A ; Clear Index
MOVC A,@A+DPTR ; Get byte pointed by Dptr
INC DPTR ; Point to the next byte
JZ LCD_Msg9 ; Return if found the zero (end of stringz)
CJNE A,#01H,Lcd_Msg1 ; Check if is a Clear Command
MOV R4,A
CALL WRLCDCOM4 ;If yes, RECEIVE it as command to LCD
JMP LCD_MSG ;Go get next byte from stringz
Lcd_Msg1: CJNE A,#0FFH,FLL ;Check for displaying full character
MOV R4,A
CALL WRLCDDATA
JMP LCD_MSG
FLL: CJNE A,#080h,$+3 ; Data or Address? If => 80h then is address.
JC Lcd_Msg_Data ; Carry will be set if A < 80h (Data)
MOV R4,A
CALL WRLCDCOM4 ; Carry not set if A=>80, it is address
JMP Lcd_Msg ; Go get next byte from stringz
Lcd_Msg_Data: ;
MOV R4,A
CALL WRLCDDATA ; It was data, RECEIVE it to Lcd
JMP Lcd_Msg ; Go get next byte from stringz
Lcd_Msg9:
RET ; Return to Caller
; **********************************************************
; 1 MILLISECOND DELAY ROUTINE
; **********************************************************
MDELAY:
PUSH ACC
MOV A,#0A6H
MD_OLP:
INC A
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
JNZ MD_OLP
NOP
POP ACC
RET
MADELAY:
PUSH ACC
MOV A,#036H
MAD_OLP:
INC A
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
JNZ MAD_OLP
NOP
POP ACC
RET
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DELAYS: ;One second delay routine
MOV R6, #00H ;put 0 in register R6 (R6 = 0)
MOV R5, #04H ;put 5 in register R5 (R5 = 4)
LOOPB:
INC R6 ;increase R6 by one (R6 = R6 +1)
ACALL DELAYMS ;call the routine above. It will run and return to here.
MOV A, R6 ;move value in R6 to A
JNZ LOOPB ;if A is not 0, go to LOOPB
DEC R5 ;decrease R5 by one. (R5 = R5 -1)
MOV A, R5 ;move value in R5 to A
JNZ LOOPB ;if A is not 0 then go to LOOPB.
RET
;**************************************************************************
DELAYMS: ;millisecond delay routine
; ;
MOV R7,#00H ;put value of 0 in register R7
LOOPA:
INC R7 ;increase R7 by one (R7 = R7 +1)
MOV A,R7 ;move value in R7 to Accumlator (also known as A)
CJNE A,#0FFH,LOOPA ;compare A to FF hex (256). If not equal go to LOOPA
RET ;return to the point that this routine was called from
;**************************************************************************
;***********************************************************************
; THIS ROUTINE SENDS OUT CONTENTS OF THE ACCUMULATOR
; to the EEPROM and includes START condition. Refer to the data sheets
; for discussion of START and STOP conditions.
;***********************************************************************
OUTS: MOV R2,#8 ;LOOP COUNT -- EQUAL TO BIT COUNT
SETB SDA1 ;INSURE DATA IS HI
SETB SCL1 ;INSURE CLOCK IS HI
NOP ;NOTE 1
NOP
NOP
CLR SDA1 ;START CONDITION -- DATA = 0
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK = 0
OTSLP: RLC A ;SHIFT BIT
JNC BITLS
SETB SDA1 ;DATA = 1
JMP OTSL1 ;CONTINUE
BITLS: CLR SDA1 ;DATA = 0
OTSL1: SETB SCL1 ;CLOCK HI
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK LOW
DJNZ R2,OTSLP ;DECREMENT COUNTER
SETB SDA1 ;TURN PIN INTO INPUT
NOP ;NOTE 1
SETB SCL1 ;CLOCK ACK
NOP ;NOTE 1
NOP
NOP
CLR SCL1
RET
;**********************************************************************
; THIS ROUTINE SENDS OUT CONTENTS OF ACCUMLATOR TO EEPROM
; without sending a START condition.
;**********************************************************************
OUT: MOV R2,#8 ;LOOP COUNT -- EQUAL TO BIT COUNT
OTLP: RLC A ;SHIFT BIT
JNC BITL
SETB SDA1 ;DATA = 1
JMP OTL1 ;CONTINUE
BITL: CLR SDA1 ;DATA = 0
OTL1: SETB SCL1 ;CLOCK HI
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK LOW
DJNZ R2,OTLP ;DECREMENT COUNTER
SETB SDA1 ;TURN PIN INTO INPUT
NOP ;NOTE 1
SETB SCL1 ;CLOCK ACK
NOP ;NOTE 1
NOP
NOP
CLR SCL1
RET
STOP: CLR SDA1 ;STOP CONDITION SET DATA LOW
NOP ;NOTE 1
NOP
NOP
SETB SCL1 ;SET CLOCK HI
NOP ;NOTE 1
NOP
NOP
SETB SDA1 ;SET DATA HIGH
RET
;*******************************************************************
; THIS ROUTINE READS A BYTE OF DATA FROM EEPROM
; From EEPROM current address pointer.
; Returns the data byte in R1
;*******************************************************************
CREAD: MOV A,#RDCMD ;LOAD READ COMMAND
CALL OUTS ;SEND IT
CALL IN ;READ DATA
MOV R1,A ;STORE DATA
CALL STOP ;SEND STOP CONDITION
RET
;**********************************************************************
; THIS ROUTINE READS IN A BYTE FROM THE EEPROM
; and stores it in the accumulator
;**********************************************************************
IN: MOV R2,#8 ;LOOP COUNT
SETB SDA1 ;SET DATA BIT HIGH FOR INPUT
INLP: CLR SCL1 ;CLOCK LOW
NOP ;NOTE 1
NOP
NOP
NOP
SETB SCL1 ;CLOCK HIGH
CLR C ;CLEAR CARRY
JNB SDA1,INL1 ;JUMP IF DATA = 0
CPL C ;SET CARRY IF DATA = 1
INL1: RLC A ;ROTATE DATA INTO ACCUMULATOR
DJNZ R2,INLP ;DECREMENT COUNTER
CLR SCL1 ;CLOCK LOW
RET
;*********************************************************************
; This routine test for WRITE DONE condition
; by testing for an ACK.
; This routine can be run as soon as a STOP condition
; has been generated after the last data byte has been sent
; to the EEPROM. The routine loops until an ACK is received from
; the EEPROM. No ACK will be received until the EEPROM is done with
; the write operation.
;*********************************************************************
ACKTST: MOV A,#WTCMD ;LOAD WRITE COMMAND TO SEND ADDRESS
MOV R2,#8 ;LOOP COUNT -- EQUAL TO BIT COUNT
CLR SDA1 ;START CONDITION -- DATA = 0
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK = 0
AKTLP: RLC A ;SHIFT BIT
JNC AKTLS
SETB SDA1 ;DATA = 1
JMP AKTL1 ;CONTINUE
AKTLS: CLR SDA1 ;DATA = 0
AKTL1: SETB SCL1 ;CLOCK HI
NOP ;NOTE 1
NOP
NOP
CLR SCL1 ;CLOCK LOW
DJNZ R2,AKTLP ;DECREMENT COUNTER
SETB SDA1 ;TURN PIN INTO INPUT
NOP ;NOTE 1
SETB SCL1 ;CLOCK ACK
NOP ;NOTE 1
NOP
NOP
JNB SDA1,EXIT ;EXIT IF ACK (WRITE DONE)
JMP ACKTST ;START OVER
EXIT: CLR SCL1 ;CLOCK LOW
CLR SDA1 ;DATA LOW
NOP ;NOTE 1
NOP
NOP
SETB SCL1 ;CLOCK HIGH
NOP
NOP
SETB SDA1 ;STOP CONDITION
RET
;*********************************************************************
END |