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Đệ tử 3 túi
Tham gia ngày: Sep 2005
Bài gửi: 54
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Phan 2( cac module ve I2C va LCD )
PHP Code:
;================================== Cac chuong trinh con ======================
CONVERT
MOVLW START_RAM
MOVWF FSR
MOVF RAM_HOU,W ; Xu ly du lieu gio
ANDLW B'00010000'
MOVWF INDF
SWAPF INDF,F ; Luu vao trong Ram
INCF FSR,F
MOVF RAM_HOU,W
ANDLW B'00001111'
MOVWF INDF ; Ket thuc qua trinh xu ly hour
INCF FSR,F ; Bat dau xu ly minute
MOVF RAM_MIN,W ; Xy ly bien High truoc
ANDLW B'01110000'
MOVWF INDF
SWAPF INDF,F
INCF FSR,F
MOVF RAM_MIN,W
ANDLW B'00001111'
MOVWF INDF
INCF FSR,F ; Bat dau xu ly SECOND
MOVF RAM_SEC,W ; Xy ly bien High truoc
ANDLW B'01110000'
MOVWF INDF
SWAPF INDF,F
INCF FSR,F
MOVF RAM_SEC,W
ANDLW B'00001111'
MOVWF INDF
RETURN
WRITE_TIMER_LCD
MOVLW START_RAM
MOVWF FSR
MOVLW 0x02
MOVWF R7
MOVLW 0x05
CALL GOTOLINE1
LOOP_WTL1
MOVF INDF,W ; Qua trinh hien thi gio, phut, giay len dong 1 cua LCD
ADDLW 0x30
CALL WRITE_TEXT
INCF FSR,F
MOVF INDF,W
ADDLW 0x30
CALL WRITE_TEXT
MOVLW ':'
CALL WRITE_TEXT
INCF FSR,F
DECFSZ R7,F
GOTO LOOP_WTL1 ; Ket thuc qua trinh hien thi timer
MOVF INDF,W ; Qua trinh hien thi gio, phut, giay len dong 1 cua LCD
ADDLW 0x30
CALL WRITE_TEXT
INCF FSR,F
MOVF INDF,W
ADDLW 0x30
CALL WRITE_TEXT
RETURN
Write_RTC ; write W register to address Adr_Lo
movwf DAT_VAL ; save W
call I2C_Start
call I2C_Set_Write
; If ACK error display 'e'
btfsc I2Cflags, 0
call Error_Routine
; call I2C_Hi_Adr ; used for extendd addressing (24L64/5)
call I2C_Lo_Adr
; If ACK error display 'f'
btfsc I2Cflags, 0
call Error_Routine1
movf DAT_VAL, W ; send the actual data
movwf OutputByte
call I2C_Out
call I2C_NAK
; If ACK error display 'g'
btfsc I2Cflags, 0
call Error_Routine2
call I2C_Stop
call WaitForWrite
return
Read_RTC ; reads data at location specified in Adr_Lo (& Adr_Hi for 24LC64)
call I2C_Start ; and page specified in Data_Page
call I2C_Set_Write ; returns result in W
; If ACK error display 'e'
btfsc I2Cflags, 0
call Error_Routine
call I2C_Lo_Adr
; If ACK error display 'f'
btfsc I2Cflags, 0
call Error_Routine1
call I2C_Start ; note there is no STOP
call I2C_Set_Read
; If ACK error display 'g'
btfsc I2Cflags, 0
call Error_Routine2
call I2C_Read ; fetch the byte
call I2C_Send_NAK ; send no acknowledgement
call I2C_Stop
movf InputByte, W ; return the byte in W
return
; The following routines are low level I2C routines applicable to most
; interfaces with I2C devices.
I2C_Read ; read byte on i2c bus
clrf InputByte
movlw 0x08
movwf _N ; set index to 8
call HIGH_SDA ; be sure SDA is configured as input
In_Bit
call HIGH_SCL ; clock high
btfss I2C_PORT, SDA ; test SDA bit
goto In_Zero
goto In_One
In_Zero
bcf STATUS, C ; clear carry
rlf InputByte, f ; i_byte = i_byte << 1 | 0
goto Cont_In
In_One
bsf STATUS, C ; set carry
rlf InputByte, f
Cont_In
call LOW_SCL ; bring clock low
decfsz _N, F ; decrement index
goto In_Bit
return
I2C_Out: ; send w register on I2C bus
movwf OutputByte
movlw 0x08
movwf _N
Out_Bit:
bcf STATUS, C ; clear carry
rlf OutputByte, f ; left shift, most sig bit is now in carry
btfss STATUS, C ; if one, send a one
goto Out_Zero
goto Out_One
Out_Zero:
call LOW_SDA ; SDA at zero
call Clock_Pulse
call HIGH_SDA
goto Out_Cont
Out_One:
call HIGH_SDA ; SDA at logic one
call Clock_Pulse
Out_Cont:
decfsz _N, F ; decrement index
goto Out_Bit
return
;;;;;;
I2C_NAK: ; bring SDA high and clock
call HIGH_SDA
call HIGH_SCL
clrf count ; wait for ACK
WaitForACK
incf count, f ; increase timeout counter each time ACK is not received
btfsc STATUS, Z
goto No_ACK_Rec
btfsc I2C_PORT, SDA ; test pin. If clear, RTC is pulling SDA low for ACK
goto WaitForACK ; ...otherwise, continue to wait
bcf I2Cflags, 0 ; clear flag bit (ACK received)
call LOW_SCL
return
I2C_Send_NAK: ; bring SDA high and clock
call HIGH_SDA
call Clock_Pulse
return
WaitForWrite ; poll ACK for write timing
call I2C_Start
call I2C_Set_Write
btfsc I2Cflags, 0
goto WaitForWrite
return
;------ No ACK received from slave (must use "return" from here)
;; Typically, set a flag bit to indicate failed write and check for it upon return.
No_ACK_Rec
bsf I2Cflags, 0 ; set flag bit
return
I2C_ACK:
call LOW_SDA
call Clock_Pulse
return
I2C_Start:
call LOW_SCL
call HIGH_SDA
call HIGH_SCL
call LOW_SDA ; bring SDA low while SCL is high
call LOW_SCL
return
I2C_Stop:
call LOW_SCL
call LOW_SDA
call HIGH_SCL
call HIGH_SDA ; bring SDA high while SCL is high
call LOW_SCL
return
I2C_Set_Write
MOVLW Chip_Write
call I2C_Out
call I2C_NAK
return
I2C_Set_Read
MOVLW Chip_Read
call I2C_Out
call I2C_NAK
return
I2C_Lo_Adr movf Adr_Lo, W ; send low byte of address
call I2C_Out
call I2C_NAK
return
Clock_Pulse: ; SCL momentarily to logic one
call HIGH_SCL
call LOW_SCL
return
HIGH_SDA: ; high impedance by making SDA an input
bsf STATUS, RP0 ; bank 1
bsf I2C_TRIS, SDA ; make SDA pin an input
bcf STATUS, RP0 ; back to bank 0
return
LOW_SDA:
bcf I2C_PORT, SDA
bsf STATUS, RP0 ; bank 1
bcf I2C_TRIS, SDA ; make SDA pin an output
bcf STATUS, RP0 ; back to bank 0
return
HIGH_SCL:
bsf STATUS, RP0 ; bank 1
bsf I2C_TRIS, SCL ; make SCL pin an input
bcf STATUS, RP0 ; back to bank 0
return
LOW_SCL:
bcf I2C_PORT, SCL
bsf STATUS, RP0 ; bank 1
bcf I2C_TRIS, SCL ; make SCL pin an output
bcf STATUS, RP0 ; back to bank 0
return
;------ No ACK received from slave. This is the error handler.
Error_Routine
; Output error message, etc. here
MOVLW 0x04
CALL GOTOLINE2
movlw 'e'
call WRITE_TEXT
return ; returns to INITIAL calling routine
Error_Routine1
; Output error message, etc. here
MOVLW 0x05
CALL GOTOLINE2
movlw 'f'
call WRITE_TEXT
return
Error_Routine2
; Output error message, etc. here
MOVLW 0x06
CALL GOTOLINE2
movlw 'g'
call WRITE_TEXT
return
; End of I2C routines
;======================== MODULE LCD ====================================
WRITE_2_NIBBLES
MOVWF ACC
BANKSEL TRISB
MOVLW B'11110000' ; Chon data lam dau ra
ANDWF TRIS_DAT,F
BANKSEL PORTB
MOVLW 0x0F
IORWF PORT_DAT,F
SWAPF ACC,W
IORLW 0xF0
ANDWF PORT_DAT,F ; Dua 4 bit CAO ra Port_CON
BSF PORT_CON,EN
NOP
BCF PORT_CON,EN
MOVLW 0x0F
IORWF PORT_DAT,F
MOVF ACC,W
IORLW 0xF0
ANDWF PORT_DAT,F ; Dua 4 bit THAP ra Port_CON
BSF PORT_CON,EN
NOP
BCF PORT_CON,EN
RETURN
INIT_LCD
CALL DELAY100
BANKSEL TRISA
MOVLW B'00000'
MOVWF TRIS_DAT
BCF TRIS_CON,EN
BCF TRIS_CON,RS
BCF TRIS_CON,RW
BANKSEL PORTA
BCF PORT_CON,RS
BCF PORT_CON,RW
BCF PORT_CON,EN
BSF PORT_CON,EN
MOVLW 0x82
MOVWF PORT_DAT
BCF PORT_CON,EN
CALL DELAY5
MOVLW 0x28
CALL WRITE_2_NIBBLES ; Write A as two separate nibbles to LCD
CALL DELAY5
MOVLW 0x0E
CALL WRITE_2_NIBBLES
CALL DELAY5
MOVLW 0x06
CALL WRITE_2_NIBBLES
CALL DELAY5
RETURN
CLEAR_LCD
BCF PORT_CON,RS
MOVLW 0x01
CALL WRITE_2_NIBBLES
CALL DELAY50
RETURN
WRITE_TEXT
BSF PORT_CON,RS
CALL WRITE_2_NIBBLES
CALL DELAY5
RETURN
GOTOLINE1
BCF PORT_CON,RS
ADDLW 0x80
CALL WRITE_2_NIBBLES
CALL DELAY5
RETURN
GOTOLINE2
BCF PORT_CON,RS
ADDLW 0xC0
CALL WRITE_2_NIBBLES
CALL DELAY5
RETURN
DELAY255 movlw 0xff ;delay 255 mS
goto D0
DELAY100 movlw d'100' ;delay 100mS
goto D0
DELAY50 movlw d'50' ;delay 50mS
goto D0
DELAY20 movlw d'20' ;delay 20mS
goto D0
DELAY5 movlw 0x05 ;delay 5.000 ms (4 MHz clock)
D0 movwf R2
D1 movlw 0xC7 ;delay 1mS
movwf R3
movlw 0x01
movwf R4
Delay_0
decfsz R3, f
goto $+2
decfsz R4, f
goto Delay_0
decfsz R2 ,f
goto D1
retlw 0x00
END
Luu y voi cac ban la: cac ky tu f,g,e trong chuong trinh tren la cac ky tu bao loi duong truyen
thay đổi nội dung bởi: mafd_47a, 26-10-2005 lúc 01:39 AM.
Lý do: Quen Up len so do khoi
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