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;         Full Version for 87C51FA 8K Micro from -67 to 257 degrees F.
;
;                    ASSEMBLED WITH METALINKS ASM51.EXE
;
;            Project: ( Thermostat ), And DS1620 Chip Programmer.
;                   Software For Control & Use of DS1620
;                   Digital Thermometer & Thermostat I.C
;                      Microcontroller ( P87C51FA DIP )
;                           11.0592 MHz Crystal
;                            LCD = { 20 X 4 }
;                      Port connections as follows.
;               Copyright (C) 1998  B. Reynolds Electronics
;
; Micro PIN# TO    LCD  Pin#   Micro Pin# TO   DS1620   Pin#  LCD  Pin#
; p1.0  #1  ---->  db0  #7     p3.0  #10 ----> DQ       #1    GND  #1
; p1.1  #2  ---->  db1  #8     p3.1  #11 ----> CLK/CONV #2    VCC  #2
; p1.2  #3  ---->  db2  #9     p3.2  #12 ----> RST      #3    VR   #3
; p1.3  #4  ---->  db3  #10    p3.3  #13 -------------------> RS   #4
; p1.4  #5  ---->  db4  #11    p3.4  #14 -------------------> R/W  #5
; p1.5  #6  ---->  db5  #12    p3.5  #15 -------------------> E    #6
; p1.6  #7  ---->  db6  #13                    DS1620   PIN#
; p1.7  #8  ---->  db7  #14                    GND      #4
;                                              VCC      #8
; **********************************************************************
; *                    User Data Entry Buttons As Follows              *
; *                                                                    *
; * p2.0 = Up          : increment temperature setting + display.      *
; * p2.1 = Down        : decrement temperature setting + display.      *
; * p2.2 = Enter       : Enter key accepts entry goes to next function.*
; * p2.3 = Stand Alone : Sets DS1620 up for stand alone thermostat     *
; *                    ; operation.                                    *
; * p2.4 = Display     : Display high & low 1620 programmed settings.  *
; * p2.5 = Mode        : Change from ( program ) mode to ( display )   *
; *                    ; mode.                                         *
; * p2.5 is a slide switch, All others are N.O. Momentary Contact.     *
; *                                                                    *
; **********************************************************************
;
;
;
; Setup Equates Table Here, Inform Assembler of Constants

               lcd_data   equ 090h
               config     equ 38h
               entrymode  equ 6
               offcur     equ 0ch
               linecur    equ 0eh
               homecur    equ 02h
               clrdsp     equ 01h
               offdsp     equ 0ah
               ondsp      equ 0eh
               sbuf       equ 99h
               ren        equ 9ch
               ri         equ 98h
               ti         equ 99h
               lcd_rs     equ 0b3h
               lcd_rw     equ 0b4h
               lcd_e      equ 0b5h
               th_lsb     data 30h
               th_msb     data 31h
               tl_lsb     data 32h
               tl_msb     data 33h
               b          equ  0f0h
               p2         equ  0a0h
               p3         equ  0b0h
               acc        equ  0e0h
               dph        equ  83h
               dpl        equ  82h

org  0         ; Establish Reset Vector Here

Hello:
               lcall resetlcd
               lcall initlcd
             

bsp; MOV   a,#1
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db   ' --**  DS1620  **-- ',0
               MOV   r4,#offcur
               lcall wrlcdcom
               MOV   a,#2
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db   '     PROGRAMMER     ',0
               MOV   r4,#offcur
               lcall wrlcdcom
               MOV   a,#3
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db   '                    ',0
               MOV   a,#4
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db   '   { VERSION 1.0 }  ',0
               lcall big_delay2
               lcall big_delay2

comin_back:
               lcall resetlcd
               lcall initlcd
               sjmp  select
back:
               MOV   a,#2
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db   '*-{ PROGRAM MODE }-*',0
               MOV   a,#3
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db   ' PRESS FUNCTION KEY ',0
               MOV   r4,#offcur
               lcall wrlcdcom

select:
               MOV   p2,#0ffh   ; setup port2 for input/ for 8031
                                ; use port0
                                ; isr routine for CPU operation
buttons:
               jnb   p2.4,isr   ; Display 1620 programmed high
                                ; & low setpoints.
               jnb   p2.5,begin1; MODE SWITCH program/display temp.
               jnb   p2.2,set1  ; Begin programming sequence for
                                ; DS1620 chip.
               jnb   p2.3,strt_conv ; issue start_convert for
                                ; stand_alone operation
               jb    p2.5,back  ; Program Mode ?
               sjmp  buttons    ; no key press ? then stay here.

set1:
               jnb   p2.2,set1  ; debounce keypress
               lcall big_delay  ;
               ljmp  up1        ; goto chip programming routine.
begin1:
               ljmp  begin      ; goto display temp routine.
isr:
               lcall isr2       ; goto fetch setpoints for
                                ; viewing routine.
               sjmp  comin_back

strt_conv:
               lcall big_delay  ; routine to setup 1620 for
                                ; stand-alone ops.
               clr   p3.2       ;
               setb  p3.0
               setb  p3.1
               MOV   a,#0ch
               lcall out_cmd
               MOV   a,#00h
               lcall out_data
               MOV   a,#0eeh
               lcall out_cmd
               lcall big_delay
               clr   p3.2
               lcall resetlcd
               lcall initlcd
               lcall prtlcd
               db    ' DS1620  PROGRAMMED ',0
               MOV   a,#2nbsp;         mov   b,#0
               lcall placecur
               lcall prtlcd
               db    'FOR STAND ALONE OPS',0
               MOV   a,#3
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db    'POWER OFF PROGRAMMER',0
               MOV   a,#4
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db    'AND REMOVE 1620 I.C.',0
               MOV   r4,#offcur
               lcall wrlcdcom

alone_only:
               sjmp  alone_only ; loop here for user to power
                                ; down device and reMOVe 1620 I.C.
                                ; from programmer.

Begin:
               lcall resetlcd   ; begin routine for display of
                                ; temperature
               lcall initlcd    ; with 1620 device located in
                                ; programmer.
                                ; We start here if the MODE
                                ; switch is in display position
               MOV   a,#1
               MOV   b,#0
               lcall placecur
               lcall prtlcd     ; Print some fancy corners
               db    '*                  *',0
               MOV   a,#4
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db    '*                  *',0
               MOV   a,#2
               MOV   b,#0
               lcall placecur
               lcall prtlcd
               db ' DS1620 TEMPERATURE ',0
               MOV   a,#3         ; set cursor on line #3
               MOV   b,#12        ; at position #12
               lcall placecur     ; place cursor routine
               lcall prtlcd       ; print routine
               db    11011111b,01000110b,0
                                  ; Data for deg F symbol.
               MOV   a,#0ffh
               lcall delay
               MOV   a,#3         ; Set location for cursor
               MOV   b,#6         ; to display current
                                  ; temperature.
               lcall placecur
               MOV   r4,#offcur   ; Turn OFF Cursor.
               lcall wrlcdcom     ; write lcd command routine

;  Here we will continously convert temp,
;  in CPU Mode for Temp Display
check_tmp:
               clr   p3.2        ; reset ds1620
               setb  p3.0        ; RXD and TXD high
               setb  p3.1

               MOV   a,#0ch      ; Load Write configuration
                                 ; byte instruction
               lcall out_cmd     ; send it to 1620
               MOV   a,#02h      ; set config byte = cpu mode,
               lcall out_data    ; send it to 1620

               MOV   a,#0eeh     ; initiate temperature conversion
               lcall out_cmd

               MOV   a,#0ffh     ; set delay time here
               lcall delay

read_tmp:
               clr   a
               MOV   a,#0aah     ; Load instruction to fetch last temp
               lcall out_cmd     ; conversion result.

        
     nbsp;      lcall in_data     ; get temp data from ds1620 ( LSB )
               MOV   r3,a        ; move ( LSB ) of temp data to Storage
                                 ; Register.
               lcall in_data     ; get temp data from ds1620 ( MSB )
               MOV   r1,a        ; move ( MSB ) of temp data to Storage
                                 ; Register.

; use data retrieved into Storage Registers, to point to
; lookup_table data to be shown on LCD.

               MOV   a,r3        ; mov conversion results to ACC
               lcall look_up     ; Fetch display data.
               MOV   a,#3        ; select lcd line #2.
               MOV   b,#6        ; start at location #7 with
                                 ; temp display.
               lcall placecur    ; place cursor at above selected
                                 ; location.
               MOV   r4,#offcur  ; kill the cursor so we dont
                                 ; have a cursor
               lcall wrlcdcom    ; being displayed.
               lcall delay       ; Delay between fetch.
               jb    p2.5,comin_back1
               ljmp  read_tmp    ; if done, go get another reading.

comin_back1:
               ljmp  comin_back; Goto program mode if switch selected

look_up:
               cjne     r1,#01h,over_32
                               ;determine if temp is above 32.
               sjmp     b0

over_32:
               ljmp     x0
st:
               ret             ; return to calling routine from here.

        ; Incredibly ( BIG ) Look-Up table begins here...........

b0:            cjne     a,#92h,b1   ; below 32 look up table
               lcall    prtlcd      ; -67 Deg F Lowest Value.
               db       '-67.0',0
               ljmp     st
b1:            cjne     a,#93h,b2
               lcall     prtlcd
               db       '-66.1',0
               ljmp     st
b2:            cjne     a,#94h,b3
               lcall     prtlcd
               db       '-65.2',0
               ljmp     st
b3:            cjne     a,#95h,b4
               lcall     prtlcd
               db       '-64.3',0
               ljmp     st
b4:            cjne     a,#96h,b5
               lcall     prtlcd
               db       '-63.4',0
               ljmp     st
b5:            cjne     a,#97h,b6
               lcall     prtlcd
               db       '-62.5',0
               ljmp     st
b6:            cjne     a,#98h,b7
               lcall     prtlcd
               db       '-61.6',0
               ljmp     st
b7:            cjne     a,#99h,b8
               lcall     prtlcd
               db       '-60.7',0
               ljmp     st
b8:            cjne     a,#9ah,b9
               lcall     prtlcd
               db       '-59.8',0
               ljmp     st
b9:            cjne     a,#9bh,b10
               lcall     prtlcd
               db       '-58.9',0
               ljmp     st
b10:           cjne     a,#9ch,b11
               lcall     prtlcd
               db       '-58.0',0
               ljmp&nbs