Debugging of 24c02 based on PIC microcontroller is completed-EEWORLD

Collect

Suitable for PIC series, assembly, memory tight friends

SDA EQU 5 ;'OC'

SCL EQU 4

ACKF EQU 0

EE_VCC EQU 2

EE_WP EQU 1 ;'H' DISABLE 'L'ENABLE

DO EQU 7

TX_BUF EQU 0X30

BUF_IN EQU 0X31

EEPROM EQU 0X32

BIT_COUNT EQU 0X33

byte_count equ 0x34

ACK EQU 0X35

rom_buf1 equ 0x36

rom_buf2 equ 0x37

rom_buf3 equ 0x38

rom_buf4 equ 0x39

rom_buf5 equ 0x3a

;**********************Start signal****************************************

BSTART:

BSF PORTA,SDA

NOP

BSF PORTA,SCL

NOP

BCF PORTA,SDA

NOP

BCF PORTA,SCL

NOP

RETLW 0

;***********************Stop signal********************************

BSTOP:

BCF PORTA,SDA

NOP

BSF PORTA,SCL

NOP

BSF PORTA,SDA

NOP

BCF PORTA,SCL

NOP

RETLW 0

;**********************Send N_ACK**************************

SEND_ACK:

NOP

BCF PORTA,SDA

NOP

BSF PORTA,SCL

NOP

BCF PORTA,SCL

NOP

RETLW 0

;**********************Send N_ACK**************************

READ_ACK:

BSF TRISA,SDA ;SET SDA IN

CLRF ACK

NOP

BSF PORTA,SCL

NOP

BTFSS PORTA,SDA

INCF ACK,F

NOP

BCF PORTA,SCL

BCF TRISA,SDA ;SET SDA OUT

NOP

RETLW ACK;0

;**********************Send a byte**************************

BYTEOUT:

MOVLW D'8'

MOVWF BIT_COUNT

TXLP

nop

CALL BITOUT

RLF TX_BUF,F

DECFSZ BIT_COUNT,F

GOTO TXLP

CALL READ_ACK

;CALL BITIN ;ACK

;BTFSC EEPROM,OF

; BSF PORTC,ACKF

RETLW 0

;************************Receive a byte********************************

BYTEIN:

BSF TRISA,SDA ;SET SDA IN

NOP

CLRF BUF_IN

MOVLW D'8'

MOVWF BIT_COUNT

BCF C ;BCF STATUS,0

RXLP RLF BUF_IN,F

;BCF BUFIN,0

CALL BITIN

;BTFSC EEPROM,OF

;BSF BUFIN,0

DECFSZ BIT_COUNT,F

GOTO RXLP

;BSF EEPROM,DO

;CALL BITOUT

BCF TRISA,SDA ;SET SDA OUT

NOP

RETLW 0

;**********************send********************************

BITOUT

;MOVLW B'00111111'

;MOVWF TRISA

NOP

BTFSS TX_BUF,7

GOTO BITLOW

BSF PORTA,SDA

GOTO CLKOUT

BITLOW BCF PORTA,SDA

CLKOUT

NOP

BSF PORTA,SCL

NOP

BCF PORTA,SCL

NOP

RETLW 0

;**********************take over****************************

SNAKE

BCF BUF_IN,0 ;EEPROM,DI

;BSF TRISA,SDA ;SET SDA IN

NOP

BSF PORTA,SCL

NOP

BTFSC PORTA,SDA

BSF BUF_IN,0

BCF PORTA,SCL

;BCF TRISA,SDA ;SET SDA OUT

RETLW 0

;-------------------------

;temp0:addr

;temp1:data

;-------------------------

writebyte

nop

call BSTART

nop

movlw 0xa0

movwf TX_BUF

call BYTEOUT

movf temp0,W

movwf TX_BUF

call BYTEOUT

movf temp1,W

movwf TX_BUF

call BYTEOUT

nop

call BSTOP

nop

call BSTOP

return

;-------------------------

;INPUT:temp0 addr

;out:BUFIN

;-------------------------

readbyte

nop

call BSTART

nop

movlw 0xa0

movwf TX_BUF

call BYTEOUT

nop

movf temp0,W ;addr

movwf TX_BUF

call BYTEOUT

nop

NOP

nop

call BSTART

nop

NOP

movlw 0xa1

movwf TX_BUF

call BYTEOUT

nop

call BYTEIN

call BSTOP

return

;-------------------------

;temp0:addr '0x10'add '0x20'data

;temp1:data

;-------------------------

writenbyte

nop

call BSTART

nop

movlw 0xa0

movwf TX_BUF

call BYTEOUT

movf temp0,W

movwf TX_BUF

call BYTEOUT

movlw 0x5

movwf byte_count

movlw rom_buf1 ; get the address of rom_buf1

movwf FSR

wx_lp:

movf INDF,W

movwf TX_BUF

call BYTEOUT

INCF FSR,F

DECFSZ byte_count,F

goto wx_lp

nop

call BSTOP

return

;-------------------------

;temp0:addr '0x10'add '0x20'data

;temp1:data num

;-------------------------

readnbyte

nop

call BSTART

nop

movlw 0xa0

movwf TX_BUF

call BYTEOUT

movf temp0,W

movwf TX_BUF

call BYTEOUT

NOP

call BSTART

nop

movlw 0xa1

movwf TX_BUF

call BYTEOUT

movlw 0x5

movwf byte_count

movlw rom_buf1 ; get the address of rom_buf1

movwf FSR

rx_lp:

call BYTEIN

call SEND_ACK

movf BUF_IN,W

movwf INDF

INCF FSR,F

DECFSZ byte_count,F

goto rx_lp

nop

call BSTOP

return

;--------------------------------

test_eeprom:

movlw 0x44

movwf add1

movlw 0x55

movwf add2

movlw 0x66

movwf add3

;movlw 0x20

;movwf temp0

;movlw add1 ;0x23 ;data *pt add1=0x23 flag 2d /2e

;movwf temp1

;call writenbyte

call save_add

call Delay100ms

;call Delay100ms

clrf rom_buf1

clrf rom_buf5

movlw 0x20

movwf temp0

call readnbyte

return

;------------------------------------------

save_add:

movlw 0xaa

movwf rom_buf1

movf add1,W

movwf rom_buf2

movf add2,W

movwf rom_buf3

movf add3,W

movwf rom_buf4

movlw 0x55

movwf rom_buf5

movlw 0x20

movwf temp0

call writenbyte

return

;------------------------------------------

save_data:

movlw 0xaa

movwf rom_buf1

movf flag,W

andlw 0x03

movwf rom_buf2

movf LED_speed,W

movwf rom_buf3

movlw 0x08; add3,W

movwf rom_buf4

movlw 0x55

movwf rom_buf5

movlw 0x30

movwf temp0

call writenbyte

return

;-----------------------------------------

;0x20

;

read_add:

movlw 0x20

movwf temp0

call readnbyte

movlw 0xaa

subwf rom_buf1,W

btfss Z

goto rd_err

movlw 0x55

subwf rom_buf5,W

btfss Z

goto rd_err

;---add is ok----------------

movf rom_buf2,W

movwf add1

movf rom_buf3,W

movwf add2

movf rom_buf4,W

movwf add3

bsf match_fin_fb

rd_err

nop

movlw 0xb0

movwf add1

movlw 0x16

movwf add2

movlw 0x47

movwf add3

bsf match_fin_fb

nop

return

;------------------------------------------

;0x30

;-----------------------------------------

read_data:

movlw 0x30

movwf temp0

call readnbyte

movlw 0xaa

subwf rom_buf1,W

btfss Z

goto rdd_err

movlw 0x55

subwf rom_buf5,W

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Reference address：Debugging of 24c02 based on PIC microcontroller is completed

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