?? lcd.lst
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A51 MACRO ASSEMBLER LCD 11/03/2000 12:22:31 PAGE 1
MACRO ASSEMBLER A51 V6.02
OBJECT MODULE PLACED IN .\lcd.OBJ
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE .\lcd.asm SET(SMALL) DEBUG EP
LOC OBJ LINE SOURCE
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8 NAME LCD
9
10 ;Set up Code Segment and exports:
11
12 LCD SEGMENT CODE
---- 13 RSEG LCD
14
15 PUBLIC _output
16 PUBLIC initialise
17 PUBLIC clearscreen
18
19
20 ;LCD Register Addresses.
0000 21 LCD_CMD_WR equ 00h
0001 22 LCD_DATA_WR equ 01h
0002 23 LCD_BUSY_RD equ 02h
0003 24 LCD_DATA_RD equ 03h
0080 25 LCD_PAGE equ 80h
26
27 ;LCD Commands
0001 28 LCD_CLS equ 1
0002 29 LCD_HOME equ 2
0004 30 LCD_SETMODE equ 4
0008 31 LCD_SETVISIBLE equ 8
0010 32 LCD_SHIFT equ 16
0020 33 LCD_SETFUNCTION equ 32
0040 34 LCD_SETCGADDR equ 64
0080 35 LCD_SETDDADDR equ 128
36
37
38
39
40 ; Initialisation Routine for the LCD display.
0000 7430 41 initialise: mov A,#030h ;1 line, 8 bits
0002 120000 F 42 call wrcmd
0005 740C 43 mov A,#LCD_SETVISIBLE + 4
0007 120000 F 44 call wrcmd
000A 748F 45 mov A,#LCD_SETDDADDR+15 ; Start at right hand side of the display
000C 120000 F 46 call wrcmd
000F 7407 47 mov A,#LCD_SETMODE + 3 ; Automatic Increment - Display shift left.
0011 120000 F 48 call wrcmd
0014 22 49 ret
50
51 ; We move the parameter (held in R7) into the Accumulator prior to writing it.
0015 EF 52 _output: mov A,R7
0016 120000 F 53 call wrdata
0019 22 54 ret
55
56
57 ;Clears the LCD display and sets the initialisation conditions.
A51 MACRO ASSEMBLER LCD 11/03/2000 12:22:31 PAGE 2
001A 7401 58 clearscreen: mov A,#LCD_CLS
001C 120000 F 59 call wrcmd
001F 748F 60 mov A,#LCD_SETDDADDR + 15
0021 120000 F 61 call wrcmd
0024 22 62 ret
63
64
65
66 ;*****************************
67 ;******** SUBROUTINES ********
68 ;*****************************
69
70 ;Sub routine to write command:
0025 75A080 71 wrcmd: mov P2,#LCD_PAGE
0028 7800 72 mov R0,#LCD_CMD_WR
002A F2 73 movx @R0,A
002B 8007 74 jmp wtbusy
75
76 ; Subroutine to Write a Character to the LCD Display.
002D 75A080 77 wrdata: MOV P2,#LCD_PAGE
0030 7801 78 MOV R0,#LCD_DATA_WR
0032 EF 79 MOV A,R7
0033 F2 80 MOVX @R0,A
81
82
83 ; Subroutine to wait for a busy clear.
0034 7902 84 wtbusy: MOV R1,#LCD_BUSY_RD
0036 E3 85 MOVX A,@R1
0037 20E7FA 86 JB ACC.7,wtbusy
003A 22 87 ret
88
89 END
A51 MACRO ASSEMBLER LCD 11/03/2000 12:22:31 PAGE 3
SYMBOL TABLE LISTING
------ ----- -------
N A M E T Y P E V A L U E ATTRIBUTES
ACC. . . . . . . . D ADDR 00E0H A
CLEARSCREEN. . . . C ADDR 001AH R SEG=LCD
INITIALISE . . . . C ADDR 0000H R SEG=LCD
LCD. . . . . . . . C SEG 003BH REL=UNIT
LCD_BUSY_RD. . . . N NUMB 0002H A
LCD_CLS. . . . . . N NUMB 0001H A
LCD_CMD_WR . . . . N NUMB 0000H A
LCD_DATA_RD. . . . N NUMB 0003H A
LCD_DATA_WR. . . . N NUMB 0001H A
LCD_HOME . . . . . N NUMB 0002H A
LCD_PAGE . . . . . N NUMB 0080H A
LCD_SETCGADDR. . . N NUMB 0040H A
LCD_SETDDADDR. . . N NUMB 0080H A
LCD_SETFUNCTION. . N NUMB 0020H A
LCD_SETMODE. . . . N NUMB 0004H A
LCD_SETVISIBLE . . N NUMB 0008H A
LCD_SHIFT. . . . . N NUMB 0010H A
P2 . . . . . . . . D ADDR 00A0H A
WRCMD. . . . . . . C ADDR 0025H R SEG=LCD
WRDATA . . . . . . C ADDR 002DH R SEG=LCD
WTBUSY . . . . . . C ADDR 0034H R SEG=LCD
_OUTPUT. . . . . . C ADDR 0015H R SEG=LCD
REGISTER BANK(S) USED: 0
ASSEMBLY COMPLETE. 0 WARNING(S), 0 ERROR(S)
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