ch15_b12-4.asm

51单片机基础篇 对于有一定基础的人看看 包含书中所以的源代码

;PROGRAM NAME B12-4.ASM
BPS9600 EQU     FDH
MS10    EQU     9217            ;APPROXIMATELY 10ms INTERRUPR
INTR_CNT EQU    30H             ;CNT STORIAGE
BUFFER  EQU     31H             ;DISPLAY BUFFER
BINARY  EQU     32H             ;BINARY DATA STORIAGE
ASCBUF  EQU     33H             ;ASCII TEMPERATURE DATA BUFFER(7 BYTES)
TX_CNT  EQU     3AH             ;TRANSMIT BYTE COUNT
;
CNTH_L  EQU     3BH
CNTH_H  EQU     3CH             ;COUNTER FOR DUTY HI
CNTT_L  EQU     3DH
CNTT_H  EQU     3EH             ;COUNTER FOR DUTY HI+LO
;
SMT160  REG     P3.2            ;TEMP SENSOR
SCOPE   REG     P3.3            ;CHECK BY SCOPE
BUZZER  REG     P3.4
CHKPUL  REG     P3.5            ;CHECK BY SCOPE
LED     REG     P3.7
KEY     REG     P3.7
;
SAMPLING REG    20H.0
TX_START REG    20H.1
;
        ORG     0000H
        JMP     START
        ORG     0003H           ;[DISABLE]  EXTERNAL INT0 INTERRUPT
        RETI
        ORG     000BH           ;[ENABLE]  TIMER0 OVERFLOW INTERRUPT
        JMP     T0_ISR
;
        ORG     0013H
        RETI                    ;[DISABLE] EXTERNAL INT1 INTERRUPT
        ORG     001BH
        RETI                    ;[DISABLE] TIMER1 OVERFLOW INTERRUPT
        ORG     0023H
        JMP     SIO_ISR         ;[ENABLE] SERIAL INTERRUPT
;
        ORG     30H
START   MOV     R0,#00H
        DJNZ    R0,$            ;DELAY A WHILE
        MOV     SP,#60H
        MOV     P1,#FFH
        MOV     P3,#FFH
        MOV     INTR_CNT,#00H
        CLR     TX_START
        MOV     TX_CNT,#00H
        CLR     BUZZER          ;P3.4=0,BUZZER OFF
        CLR     LED             ;P3.7=0,LED OFF
        CALL    SET_TMR0
        MOV     BINARY,#00H     ;BINARY DATA FOR DISPLAY
        ACALL   CONV            ;CONVERT BINARY TO BCD
        CLR     SAMPLING
$WAIT   JNB     SAMPLING,$WAIT
        SETB    LED
        CALL    READ_TEMP
        CLR     LED
        CLR     SAMPLING
        SJMP    $WAIT
;
;MEASURE PULSE
READ_TEMP
        CLR     EA
$HI     JB      SMT160,$HI
$LO     JNB     SMT160,$LO
;LOW TO HIGH TRANSITION
H_ONLY  MOV     DPTR,#0000H
        MOV     R0,#10          ;READ COUNT
        SETB    SCOPE
$0      INC     DPTR
        JB      SMT160,$0
$1      JNB     SMT160,$1       ;SKIP LO
        DJNZ    R0,$0
        MOV     R4,DPL
        MOV     R5,DPH
        CLR     SCOPE
;
H_L     MOV     DPTR,#0000H
        MOV     R0,#10
$HI     JB      SMT160,$HI
$LO     JNB     SMT160,$LO
        SETB    SCOPE
$0      INC     DPTR
        JB      SMT160,$0
$1      INC     DPTR
        JNB     SMT160,$1
        DJNZ    R0,$0
        MOV     R6,DPL
        MOV     R7,DPH
        SETB    EA
        CLR     SCOPE
;
        MOV     CNTH_L,R4
        MOV     CNTH_H,R5
        MOV     CNTT_L,R6
        MOV     CNTT_H,R7
;
        MOV     R4,CNTH_L
        MOV     R5,CNTH_H
        MOV     R7,#00H         ;(07H 06H 05H 04H)=DUTY HI
        MOV     R6,#00H
;
        MOV     0FH,#00H        ;(0FH 0EH 0DH 0CH)=212 CONSTANT
        MOV     0EH,#00H
        MOV     0DH,#00H
        MOV     0CH,#212
        CALL    MUL_4BYTE       ;RESULT IN (07H 06H 05H 04H)
;
        MOV     0FH,#00H
        MOV     0EH,#00H
        MOV     0CH,CNTT_L
        MOV     0DH,CNTT_H
        CALL    DIV_4BYTE       ;(7)(6)(5)(4)/=(F)(E)(D)(C)
        MOV     A,04H           ;GET LOWER BYTE ONLY
        SUBB    A,#68           ;A=(212*HI)/(HI+LO)-68
        MOV     BINARY,A
TEST    CALL    CONV            ;DATA IN BUFFER
        CALL    ASC_CONV
        SETB    TX_START        ;TX_START=1
        MOV     TX_CNT,#00H
        SETB    TI              ;SIO INTERRUPT
        CLR     SCOPE
        RET
;
;
ASC_CONV
        MOV     ASCBUF  ,#'T'
        MOV     ASCBUF+1,#'='
        MOV     A,BUFFER
        SWAP    A
        ANL     A,#0FH
        ADD     A,#'0'
        MOV     ASCBUF+2,A      ;SAVE DIGIT1
        MOV     A,BUFFER
        ANL     A,#0FH
        ADD     A,#'0'
        MOV     ASCBUF+3,A ;SAVE DIGIT2
        MOV     ASCBUF+4,#'C'
        MOV     ASCBUF+5,#0DH   ;CARRIAGE RETURN
        MOV     ASCBUF+6,#0AH   ;LINE FEED
        RET
;
CONV    MOV     A,BINARY
        MOV     B,#10
        DIV     AB              ;A=A/10,B=A MOD 10
        ANL     A,#0FH          ;A=A AND 0FH
        JNZ     $1
        MOV     A,#0FH          ;IF A=00H THEN A=0FH LEADING BLANK
$1      SWAP    A
        ORL     A,B             ;A AS BCD FORM
        MOV     BUFFER,A        ;SAVE AT BUFFER
        RET
;
DELAY   MOV     R7,#00H
$1      MOV     R6,#00H
        DJNZ    R6,$
        DJNZ    R7,$1
        RET
;
SIO_ISR JNB     TI,$NO_TX
        JNB     TX_START,$NO_TX
        PUSH    A
        PUSH    PSW
        PUSH    00H
        CLR     TI
        MOV     A,TX_CNT
        MOV     R0,#ASCBUF
        ADD     A,R0
        MOV     R0,A
        MOV     A,@R0
        MOV     SBUF,A
        INC     TX_CNT          ;TX_CNT=TX_CNT+1
        MOV     A,TX_CNT
        CJNE    A,#7,$ISRE
        CLR     TX_START        ;STOP TX
        MOV     TX_CNT,#00H
$ISRE   POP     00H
        POP     PSW
        POP     A
$NO_TX  RETI
;
T0_ISR
        MOV     TH0,#(65536-MS10) / 256 ;RELOAD TH0
        MOV     TL0,#(65536-MS10) .MOD. 256
        PUSH    A
        PUSH    PSW
        PUSH    00H
;
        MOV     A,BUFFER
        ANL     A,#0FH          ;GET LOW NIBBLE
        SETB    ACC.5           ;BIT5=1
        MOV     P1,A            ;SHOW 1 DIGIT
        MOV     R0,#30H
        DJNZ    R0,$            ;DELAY
;inter-blanking
        CLR     ACC.4
        CLR     ACC.5
        MOV     P1,A            ;ALL DIGIT BLANK
        MOV     R0,#04H
        DJNZ    R0,$            ;DELAY
;
        MOV     A,BUFFER
        ANL     A,#F0H          ;GET HIGH NIBBLE
        SWAP    A               ;SWAP A
        SETB    ACC.4           ;BIT4=1
        MOV     P1,A            ;SHOW ANOTHER DIGIT
        MOV     R0,#30H
        DJNZ    R0,$            ;DELAY
;
        CLR     ACC.4
        CLR     ACC.5
        MOV     P1,A            ;ALL DIGIT BLANK
;
;INTR_CNT+1
        MOV     A,INTR_CNT
        JNZ     $NEXT
        SETB    SAMPLING        ;IF A=0 OR A=50 THEN SAMPLING=1
        SJMP    $INC
$NEXT   CJNE    A,#50,$INC
        SETB    SAMPLING
$INC    INC     INTR_CNT
        MOV     A,INTR_CNT
        CJNE    A,#100,$T0_END
        MOV     INTR_CNT,#00H
$T0_END
$NO_TX  POP     00H
        POP     PSW
        POP     A
        RETI
;
SET_TMR0
        MOV     A,#21H          ;TIMER1 MODE2,TIMER0 MODE1
        MOV     TMOD,A
        MOV     TH0,#(65536-MS10) / 256 ;RELOAD TH0
        MOV     TL0,#(65536-MS10) .MOD. 256
        CLR     TF0             ;CLEAR TIMER0 FLAG
        SETB    TR0             ;TIMER0 START COUNT
        MOV     SCON,#50H       ;8BIT DATA OUTPUT
        MOV     TH1,#BPS9600    ;BAUD RATE 9600b/s
        SETB    TR1             ;TIMER1 START COUNT
        SETB    ET0             ;ENABLE TIMER0 INTERRUPT
        SETB    ES              ;ENABLE SERIAL INTERRUPT
        SETB    EA              ;ENABLE SYSTEM INTERRUPT
        RET
;
;ROUTINES FOR AT2051 KIT
;
;FUNCTION NAME : CLEAR_INTERNAL_DATA_MEMORY
;FUNCTION : CLEAR 4 BYTES DATA MEMORY 08H,09H,0AH,0BH
;
CLEAR_INTERNAL_DATA_MEMORY
        MOV     R0,#08H         ;DATA MEMORY ADDR
        MOV     R2,#04H         ;COUNT
$1      CLR     A
        MOV     @R0,A
        INC     R0
        DJNZ    R2,$1
        RET
;
;FUNCTION NAME : DATA_ADD_4BYTE
;FUNCTION : ADD 4 BYTES IN DATA MEMORY
;(R0+3)(R0+2)(R0+1)(R0)=(R0+3)(R0+2)(R0+1)(R0)+(R1+3)(R1+2)(R1+1)(R1)
;
DATA_ADD_4BYTE
        MOV     R2,#04H
        CLR     C
$1      MOV     A,@R0
        ADDC    A,@R1
        MOV     @R0,A
        INC     R0
        INC     R1
        DJNZ    R2,$1
        RET
;
;
;FUNCTION NAME : DATA_SUBTRACT
;FUNCTION : SUBTRACT 4 BYTES,RESULT IN DATA MEMORY
;(R0+3)(R0+2)(R0+1)(R0)=(R0+3)(R0+2)(R0+1)(R0)-(R1+3)(R1+2)(R1+1)(R1)
;
DATA_SUBTRACT
        MOV     R2,#04H
        CLR     C
$1      MOV     A,@R0
        SUBB    A,@R1
        MOV     @R0,A
        INC     R0
        INC     R1
        DJNZ    R2,$1
        RET
;
;FUNCTION NAME : DATA_COMPLEMENT
;FUNCTION : COMPLEMENT 4 BYTES IN (07)(06)(05)(04)
;
DATA_COMPLEMENT
        MOV     R0,#04
        MOV     R2,#04H         ;COUNT
        SETB    C               ;CY=1
$1      MOV     A,@R0
        CPL     A
        ADDC    A,#00H          ;A=A+CY
        MOV     @R0,A
        INC     R0
        DJNZ    R2,$1
        RET
;
;
;FUNCTION NAME : INTERNAL_DATA_COMPARE
;FUNCTION : COMPARE 2 BLOCKS INTERNAL DATA MEMORY (R2) TIMES
;
INTERNAL_DATA_COMPARE
$1      MOV     A,@R0
        MOV     B,@R1
        CJNE    A,B,$2
        DEC     R0
        DEC     R1
        DJNZ    R2,$1
$2      RET
;
;FUNCTION NAME : ACC_COMPARE
;FUNCTION : COMPARE ACC WITH (R0) IN DATA MEMORY (R2) TIMES
;
ACC_COMPARE
$1      MOV     B,@R0
        CJNE    A,B,$2
        INC     R0
        DJNZ    R2,$1
        CLR     A
        SJMP    $3              ;IF FOUND THEN A=0
$2      MOV     A,#01H          ;ELSE          A=1
$3      RET
;
;FUNCTION NAME :MUL_4BYTE
;FUNCTION : UNSIGNED 4 BYTE MULTIPLY
;(07H)(06H)(05H)(04H)=(07H)(06H)(05H)(04H) X (0FH)(0EH)(0DH)(0CH)
;WORKING AREA DATA MEMORY : (0BH),(0AH),(09H),(08H)
;
MUL_4BYTE
        LCALL   CLEAR_INTERNAL_DATA_MEMORY
        MOV     R3,#33          ;SHIFT COUNT
        CLR     C
$1      MOV     R1,#0BH
        MOV     R2,#08H
$2      MOV     A,@R1
        RRC     A
        MOV     @R1,A
        DEC     R1
        DJNZ    R2,$2
        JNC     $3
        CLR     C
        MOV     R0,#08H
        MOV     R1,#0CH
        LCALL   DATA_ADD_4BYTE
$3      DJNZ    R3,$1
        RET
;
;FUNCTION NAME :DIV_4BYTE
;FUNCTION : UNSIGNED 4 BYTE DIVIDE
;(07H)(06H)(05H)(04H)=(07H)(06H)(05H)(04H) / (0FH)(0EH)(0DH)(0CH)
;WORKING AREA DATA MEMORY :(0BH),(0AH),(09H),(08H)
;
DIV_4BYTE
        LCALL   CLEAR_INTERNAL_DATA_MEMORY
        MOV     R3,#32          ;SHIFT COUNT
        CLR     C
$1      MOV     R1,#04H
        MOV     R2,#08H
$2      MOV     A,@R1
        RLC     A
        MOV     @R1,A
        INC     R1
        DJNZ    R2,$2
        MOV     R0,#0BH
        MOV     R1,#0FH
        MOV     R2,#04H
        LCALL   INTERNAL_DATA_COMPARE
        JC      $3
        MOV     R0,#08H
        MOV     R1,#0CH
        LCALL   DATA_SUBTRACT
$3      CPL     C
        DJNZ    R3,$1
        MOV     R1,#04H
        MOV     R2,#04H
$4      MOV     A,@R1
        RLC     A
        MOV     @R1,A
        INC     R1
        DJNZ    R2,$4
        RET
;