汇编驱动内置ST7920的字库液晶程序|LCD12864,ST7920,
;以下是内置ST7920的KM12864-12中文液晶显示模块的汇编程序
;This program is for KM12864-12
; RS--------P3.3 ;控制定义IO口
; R/W-------P3.1
; E---------P3.0
; DB0~7-----P1 ;8位数据线
RS EQU P3.3
RW EQU P3.1
E EQU P3.0
ORG 0000H
AJMP START
ORG 0080H
START:
mov SP, #67h
LCALL DELAY
LCALL DELAY
LCALL SETUP
LCALL DEF_CHAR
MOV A,#80H
LCALL WRITE_COM
MOV R3,#8
TEST11:
MOV DPTR,#CGRAM1 ;CGRAM TEST
LCALL WRITE_CGRAM
DJNZ R3,TEST11
MOV A,#90H
LCALL WRITE_COM
MOV R3,#8
TEST12:
MOV DPTR,#CGRAM1
LCALL WRITE_CGRAM
DJNZ R3,TEST12
MOV A,#88H
LCALL WRITE_COM
MOV R3,#8
TEST13:
MOV DPTR,#CGRAM1
LCALL WRITE_CGRAM
DJNZ R3,TEST13
MOV A,#98H
LCALL WRITE_COM
MOV R3,#8
TEST14:
MOV DPTR,#CGRAM1
LCALL WRITE_CGRAM
DJNZ R3,TEST14
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
MOV A,#80H
LCALL WRITE_COM
MOV R3,#8
TEST21:
MOV DPTR,#CGRAM2
LCALL WRITE_CGRAM
DJNZ R3,TEST21
MOV A,#90H
LCALL WRITE_COM
MOV R3,#8
TEST22:
MOV DPTR,#CGRAM2
LCALL WRITE_CGRAM
DJNZ R3,TEST22
MOV A,#88H
LCALL WRITE_COM
MOV R3,#8
TEST23:
MOV DPTR,#CGRAM2
LCALL WRITE_CGRAM
DJNZ R3,TEST23
MOV A,#98H
LCALL WRITE_COM
MOV R3,#8
TEST24:
MOV DPTR,#CGRAM2
LCALL WRITE_CGRAM
DJNZ R3,TEST24
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
MOV A,#80H
LCALL WRITE_COM
MOV R3,#8
TEST31:
MOV DPTR,#CGRAM3
LCALL WRITE_CGRAM
DJNZ R3,TEST31
MOV A,#90H
LCALL WRITE_COM
MOV R3,#8
TEST32:
MOV DPTR,#CGRAM3
LCALL WRITE_CGRAM
DJNZ R3,TEST32
MOV A,#88H
LCALL WRITE_COM
MOV R3,#8
TEST33:
MOV DPTR,#CGRAM3
LCALL WRITE_CGRAM
DJNZ R3,TEST33
MOV A,#98H
LCALL WRITE_COM
MOV R3,#8
TEST34:
MOV DPTR,#CGRAM3
LCALL WRITE_CGRAM
DJNZ R3,TEST34
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
MOV A,#80H
LCALL WRITE_COM
MOV R3,#8
TEST41:
MOV DPTR,#CGRAM4
LCALL WRITE_CGRAM
DJNZ R3,TEST41
MOV A,#90H
LCALL WRITE_COM
MOV R3,#8
TEST42:
MOV DPTR,#CGRAM4
LCALL WRITE_CGRAM
DJNZ R3,TEST42
MOV A,#88H
LCALL WRITE_COM
MOV R3,#8
TEST43:
MOV DPTR,#CGRAM4
LCALL WRITE_CGRAM
DJNZ R3,TEST43
MOV A,#98H
LCALL WRITE_COM
MOV R3,#8
TEST44:
MOV DPTR,#CGRAM4
LCALL WRITE_CGRAM
DJNZ R3,TEST44
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
MOV A,#80H ;WORD TEST
LCALL WRITE_COM
MOV DPTR,#TABLE1
LCALL WRITE_ASCII
MOV A,#90H
LCALL WRITE_COM
MOV DPTR,#TABLE1
LCALL WRITE_ASCII
MOV A,#88H ;WORD TEST
LCALL WRITE_COM
MOV DPTR,#TABLE1
LCALL WRITE_ASCII
MOV A,#98H
LCALL WRITE_COM
MOV DPTR,#TABLE1
LCALL WRITE_ASCII
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
MOV A,#80H
LCALL WRITE_COM
MOV DPTR,#CHINESE
LCALL WRITE_HZ
MOV A,#90H
LCALL WRITE_COM
MOV DPTR,#chinese
LCALL WRITE_hz
MOV A,#88H
LCALL WRITE_COM
MOV DPTR,#CHINESE
LCALL WRITE_HZ
MOV A,#98H
LCALL WRITE_COM
MOV DPTR,#chinese
LCALL WRITE_hz
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
LCALL DELAY
AAA: LJMP START
SETUP: ;初始化液晶控制器
LCALL DELAY
MOV A,#01H ;CLEAR DISPLAY
LCALL WRITE_COM
MOV A,#00110000B ;FUNCTION SETTING
LCALL WRITE_COM
MOV A,#00000010B ;DDRAM SET TO '00H'
LCALL WRITE_COM
MOV A,#00000100B ;
LCALL WRITE_COM
MOV A,#00001100B ;DISPLAY ON
LCALL WRITE_COM
MOV A,#00000001B ;CLEARING SCREEN
LCALL WRITE_COM
MOV A,#10000000B ;SET DDRAM ADDRESS
LCALL WRITE_COM
RET
WRITE_COM: ;WRIT///cv ;WRITE COMMANDS TO ST7920
LCALL DELAY1 ;INSTEAD OF CHECKING BF STATE
CLR RS
CLR RS
CLR RW
CLR RW
MOV P1,A
MOV P1,A
SETB E
SETB E
NOP
NOP
CLR E
CLR E
RET
WRITE_DAT: ;WRITE DISPLAY DATAS TO ST79220
LCALL DELAY1
SETB RS
SETB RS
CLR RW
CLR RW
MOV P1,A
MOV P1,A
SETB E
SETB E
NOP
NOP
CLR E
CLR E
RET
DELAY1:
MOV R7,#010H
D11: MOV R6,#010H
DJNZ R6,$
DJNZ R7,D11
RET
DELAY:
MOV R1,#00H
D2: MOV R2,#00H
DJNZ R2,$
DJNZ R1,D2
RET
DEF_CHAR: ;WRITE TO CGRAM
MOV A,#01000000B ;SET CGRAM ADDRESS
LCALL WRITE_COM
MOV R3,#8
DEF1:
MOV A,#000H
LCALL WRITE_DAT
LCALL WRITE_DAT
MOV A,#0FFH
LCALL WRITE_DAT
LCALL WRITE_DAT
DJNZ R3,DEF1
MOV R3,#8
DEF2:
MOV A,#0AAH
LCALL WRITE_DAT
LCALL WRITE_DAT
MOV A,#0AAH
LCALL WRITE_DAT
LCALL WRITE_DAT
DJNZ R3,DEF2
MOV R3,#8
DEF3:
MOV A,#055H
LCALL WRITE_DAT
LCALL WRITE_DAT
MOV A,#0AAH
LCALL WRITE_DAT
LCALL WRITE_DAT
DJNZ R3,DEF3
mov R3,#8
DEF4:
MOV A,#0FFH
LCALL WRITE_DAT
LCALL WRITE_DAT
LCALL WRITE_DAT
LCALL WRITE_DAT
DJNZ R3,DEF4
RET
WRITE_ASCII:
MOV R4,#16
DDDD: CLR A
MOVC A,@A+DPTR
LCALL WRITE_DAT
INC DPTR
DJNZ R4,DDDD
RET
WRITE_HZ: ;WRITE 8 CHINESE TO LCD
MOV R4,#8
DD: CLR A
MOVC A,@A+DPTR
INC DPTR
LCALL WRITE_DAT
CLR A
MOVC A,@A+DPTR
INC DPTR
LCALL WRITE_DAT
DJNZ R4,DD
RET
WRITE_CGRAM: ;CGRAM TESTING
CLR A
MOVC A,@A+DPTR
LCALL WRITE_DAT
INC DPTR
CLR A
MOVC A,@A+DPTR
LCALL WRITE_DAT
RET
TABLE1:
DB 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P'
DB 'R','S','T','U','V','W','1','2','3','4','5','6','7','8','9','0'
CGRAM1: DB 000H,000H
CGRAM2: DB 000H,002H
CGRAM3: DB 000H,004H
CGRAM4: DB 000H,006H
CHINESE:
DB 0D2H,0BAH,0BEH,0A7H,0C4H,0A3H,0BFH,0E9H ;液晶模块
DB 0D2H,0BAH,0BEH,0A7H,0C4H,0A3H,0BFH,0E9H ;液晶模块
END
硬件连接图参考:
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