Chương2 :Các chương trình phục vụ cho RTC 1. SEND_START (Gửi điều kiện START) 2.
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Chương2 :Các
chương trình phục vụ cho RTC
1. SEND_START (Gửi điều kiện START)
2. SEND_STOP (Gửi điều kiện STOP)
3. SCL_HIGH
(đưa SCL lên mức cao)
4. SEND_BYTE
(gửi byte vào RTC)
5. READ_BYTE
(đọc byte từ RTC)
6. READ_CLOCK (đọc giờ từ RTC)
7. SET_CLOCK
(cài đặt giờ RTC)
8. READ_RAM
(đọc 56 byte từ RTC)
9. SET_RAM
(ghi 56 byte vào RTC)
10. OSC_CONTROL
RTC)
(Điều khiển bộ dao động trong
11. SQW_CONTROL_1HZ (xuất xung 1Hz ở chân 7 của RTC)
12. SQW_CONTROL_4KHZ(xuất xung 4.096KHz ở chân 7 của
RTC)
13. SQW_CONTROL_8KHZ(xuất xung 8.192Hz ở chân 7 của
RTC)
14. SQW_CONTROL_32KHZ(xuất xung 32.768Hz ở chân 7 của
RTC)
15. ALARM_TEST
;START CONDITION
(kiểm tra báo thức)
SEND_START:
CLR
NO_START
JB
_2W_BUSY,SEND_START_ERROR
SETB
_2W_BUSY
CLR
ACK
JNB
SCL,SEND_START_ERROR
JNB
SDA,SEND_START_ERROR
SETB
SDA
LCALL
SCL_HIGH
LCALL
DELAY
CLR
SDA
LCALL
DELAY;
CLR
SCL
RET
SEND_START_ERROR:
SETB
NO_START
RET
;===============================================
;STOP CONDITION
SEND_STOP:
CLR
SDA
LCALL
SCL_HIGH
LCALL
DELAY
SETB
SDA
NOP
JNB
SDA,$
CLR
_2W_BUSY
RET
;================================================
;SEND BYTE
;DUA GIA TRI TRONG THANH GHI A VAO DS1307
SEND_BYTE:
MOV
BITCOUNT,#8H
SEND_BYTE_LOOP:
JNB
ACC.7,LEVEL_LOW
SETB
SDA
AJMP
SEND_BITS
LEVEL_LOW:
CLR
SEND_BITS:
SDA
;
NOP
;
NOP
;
NOP
LCALL
SCL_HIGH
LCALL
DELAY
CLR
SCL;KET THUC 1 XUNG NHIP
RL
A
DJNZ
BITCOUNT,SEND_BYTE_LOOP
SETB
SDA;CAU HINH DE NHAN XUNG ACK
NOP
LCALL
;
NOP
;
NOP
;
SCL_HIGH
NOP
CLR
ACK
JNB
SDA,SEND_BYTE_COMPLISH
SETB
ACK
SEND_BYTE_COMPLISH:
LCALL
DELAY
CLR
SCL
LCALL
DELAY
RET
;=============================================\
;DOC GIA TRI VAO A
READ_BYTE:
MOV
BITCOUNT,#8H
MOV
A,#00H
SETB
SDA
READ_BITS:
LCALL
;
NOP
;
NOP
;
SCL_HIGH
NOP
MOV
RLC
A;DUA SDA VAO THANH GHI A
CLR
;
C,SDA
SCL
NOP
NOP
;
NOP
DJNZ
BITCOUNT,READ_BITS
JB
LAST_READ,NOT_ACK;NEU LA LAN DOC CUOI
CUNG THI KHONG GUI ACK
CLR
SDA;GUI ACK BIT
NOT_ACK:
LCALL
SCL_HIGH
CLR
SCL
RET;
SCL_HIGH:
SETB
SCL
JNB
SCL,$
NOP
RET
READ_CLOCK:
MOV
R0,#25H
MOV
BYTECOUNT,#00
CLR
LAST_READ
LCALL
SEND_START
MOV
A,#0D0H;WRITE COMMAND
LCALL
SEND_BYTE
MOV
A,#00H;DAT DIA CHI LAM VIEC
LCALL
SEND_BYTE
LCALL
SEND_STOP
LCALL
SEND_START
MOV
A,#0D1H;READ
LCALL
SEND_BYTE
READ_LOOP:
MOV
A,BYTECOUNT
CJNE
A,#07H,NOTLAST
SETB
LAST_READ
NOTLAST:
LCALL
READ_BYTE
MOV
@R0,A
INC
R0
INC
BYTECOUNT
MOV
A,BYTECOUNT
CJNE
A,#00H,NOT_FIRST
CLR
OSC
MOV
A,@R0
JNB
ACC.7,NO_OSC
SETB
OSC
CLR
ACC.7
MOV
@R0,A
NO_OSC:
NOT_FIRST:
CJNE
A,#8H,READ_LOOP
RET
SQW_CONTROL_1HZ:
LCALL
SEND_START
MOV
A,#0D0H
LCALL
SEND_BYTE
MOV
A,#07H;DAT DIA CHI LAM VIEC
LCALL
SEND_BYTE
MOV
A,#80H
JNB
SQW,TURN_OFF_SQW1
MOV
A,#90H
TURN_OFF_SQW1:
LCALL
SEND_BYTE
LCALL
SEND_STOP
RET
SQW_CONTROL_4KHZ:
LCALL
SEND_START
MOV
A,#0D0H
LCALL
SEND_BYTE
MOV
A,#07H;DAT DIA CHI LAM VIEC
LCALL
SEND_BYTE
MOV
A,#81H
JNB
SQW,TURN_OFF_SQW2
MOV
A,#91H
TURN_OFF_SQW2:
LCALL
SEND_BYTE
LCALL
SEND_STOP
RET
SQW_CONTROL_8KHZ:
LCALL
SEND_START
MOV
A,#0D0H
LCALL
SEND_BYTE
MOV
A,#07H;DAT DIA CHI LAM VIEC
LCALL
SEND_BYTE
MOV
A,#82H
JNB
SQW,TURN_OFF_SQW3
MOV
A,#92H
TURN_OFF_SQW3:
LCALL
SEND_BYTE
LCALL
SEND_STOP
RET
SQW_CONTROL_32KHZ:
LCALL
SEND_START
MOV
A,#0D0H
LCALL
SEND_BYTE
MOV
A,#07H;DAT DIA CHI LAM VIEC
LCALL
SEND_BYTE
MOV
A,#83H
JNB
SQW,TURN_OFF_SQW4
MOV
A,#93H
TURN_OFF_SQW4:
LCALL
SEND_BYTE
LCALL
SEND_STOP
RET
;***********************************
READ_RAM:
MOV
R0,#30H
MOV
BYTECOUNT,#00H
CLR
LAST_READ
LCALL
SEND_START
MOV
A,#0D0H;WRITE COMMAND
LCALL
SEND_BYTE
MOV
A,#08H
LCALL
SEND_BYTE;DAT DIA CHI LAM VIEC
LCALL
SEND_STOP
LCALL
SEND_START
MOV
A,#0D1H;READ COMMAND
LCALL
SEND_BYTE
READ_RAM_LOOP1:
MOV
CJNE
CUOI CUNG
SETB
A,BYTECOUNT
A,#55,NOT_LAST2;KHONG PHAI LAN DOC
LAST_READ
NOT_LAST2:
LCALL
MOV
@R0,A
INC
R0
INC
BYTECOUNT
MOV
A,BYTECOUNT
CJNE
A,#56,READ_RAM_LOOP1
LCALL
RET
READ_BYTE
SEND_STOP
SET_RAM:
MOV
R0,#30H
MOV
BYTECOUNT,#00H
LCALL
SEND_START
MOV
A,#0D0H;WRITE COMMAND
LCALL
SEND_BYTE
MOV
A,#08H
LCALL
SEND_BYTE;DIA CHI LAM VIEC
SET_RAM_LOOP:
MOV
A,@R0
LCALL
SEND_BYTE
INC
R0
INC
BYTECOUNT
MOV
A,BYTECOUNT
CJNE
A,#38H,SET_RAM_LOOP
LCALL
SEND_STOP
RET
OSC_CONTROL:
LCALL
SEND_START
MOV
A,#0D0H;WRITE COMMAND
LCALL
SEND_BYTE
MOV
A,#00H
LCALL
SEND_BYTE
LCALL
SEND_STOP
LCALL
SEND_START
MOV
A,#0D1H;READ COMMAND
LCALL
SEND_BYTE
SETB
LAST_READ
LCALL
READ_BYTE
PUSH
ACC;CAT SECOND TRONG REAL TIMER
LCALL
SEND_STOP
LCALL
SEND_START
MOV
A,#0D0H;WRITE COMMAND
LCALL
SEND_BYTE
MOV
A,#00H
LCALL
SEND_BYTE
JB
OSC,OSC_ON
POP
ACC
SETB
ACC.7;OSC DISABLE
LJMP
SET_OSC
OSC_ON:
POP
ACC
CLR
ACC.7
SET_OSC:
LCALL
SEND_BYTE
LCALL
SEND_STOP
RET
ALARM_TEST:
JNB
ALARM,EXIT_ALARM
MOV
A,MINUTE
CJNE
A,MINUTE_ALARM,EXIT_ALARM
MOV
A,HOUR
CJNE
A,HOUR_ALARM,EXIT_ALARM
CLR
P3.6;BAO THUC
EXIT_ALARM:
SETB
RET
P3.6;TAT BAO THUC
