前阵子我在别的论坛买了一块16×64的点阵屏，带STC89C52RC驱动的，根据实物，我已绘制出其电路，并下载了一个左移程序，但搞了很久，都无法解决重影问题！如果一帧只扫一次的话，没有重影，每行扫频为1ms，但移动速度很多，没什么实用价值，于是设置R2延迟因子，同一帧扫几次，这样左移速度虽然慢下来了，但有重影。请高人指导一二！谢谢！！
电路及汇编程序如下：
;============================================
; 16*64点阵屏左移程序
;============================================
D_F EQU 40H ;第一个显示数据缓冲器
D_MB EQU 30H ;数据位移动次数寄存器
D_AM EQU 31H ;显示半角字个数寄存器
DAMT EQU 32H ;显示半角字个数倍数寄存器
OFFSET EQU 33H ;数据指针偏移量
EN EQU P2.7 ;消隐信号线
S_I EQU P3.5 ;数据总线
RCK EQU P2.6 ;锁存信号线
SCK EQU P2.5 ;移位时钟信号线
;--------程序入口地址----------------
ORG 0000H
JMP START
ORG 0030H
;====================================
; 初始化
;====================================
START:
MOV SP, #0AH ;修改堆栈指针
CLR A ;清累加器
MOV R7, #9
MOV R0, #D_F
ST1: MOV @R0, A
INC R0
DJNZ R7, ST1
MOV R7, #4
MOV R0, #D_MB
ST2: MOV @R0, A
INC R0
DJNZ R7, ST2 ;寄存器清0
MOV P2, #0FFH
MOV DPTR, #DTAB ;数据表首地址放入DPTR
MOV DAMT, #1 ;显示的半角字的个数的倍数
MOV R2, #4
;====================================
; 主程序
;====================================
MAIN:
MOV R5, #16 ;扫描16行
MOV OFFSET, #00H ;数据指针偏移量清0
MA1: CALL QUSHU ;调用取数子程序
CALL DSEND ;调用发送子程序
SETB EN ;关显示
CLR RCK
NOP
SETB RCK ;锁存显示数据
PUSH DPH
PUSH DPL ;数据保护
MOV DPTR, #TAB ;定位行选表
MOV A, R5
DEC A ;修正行选位
MOVC A, @A+DPTR ;提取行选码
ANL P2, #0F0H ;将P2低四位清零
ADD A, P2 ;A的低四位行选码和P2的高四位相加
MOV P2, A ;将结果放回P2
POP DPL
POP DPH
CLR EN ;开显示
LCALL DELAY
DJNZ R5, MA1 ;16行未完继续
DJNZ R2, MAIN
MOV R2, #4;移动速度
INC D_MB
MOV A, D_MB
CJNE A, #8,MAIN
MOV D_MB, #0 ;1个半角字符要移动8次
MOV A, #16
ADD A, DPL
MOV DPL, A
MOV A, DPH
ADDC A, #00H
MOV DPH, A ;地址指针修改
INC D_AM
MOV A, D_AM
CJNE A, #64, MAIN ;显示的半角字符的个数
MOV D_AM, #00H
DJNZ DAMT, MAIN
;MOV DAMT, #1 ;显示的半角字的个数的倍数
JMP START ;循环滚动显示
;===================================
; 取一行数子程序
;===================================
QUSHU:
MOV R7, #9 ;取出半角字数据的个数
MOV R0, #D_F ;数据缓冲区首地址存入R0
PUSH DPH
PUSH DPL ;数据保护
MOV A, OFFSET ;查表偏移量放入A
QUSH1: ADD A, DPL
MOV DPL, A
MOV A, DPH
ADDC A, #00H
MOV DPH, A
CLR A
MOVC A, @A+DPTR ;查表取数
MOV @R0, A ;存储数据
INC R0 ;修改地址指针
MOV A, #16 ;修改查表偏移量
DJNZ R7, QUSH1 ;数据未取完继续
POP DPL
POP DPH
INC OFFSET ;查表偏移量+1
RET
;===================================
; 数据发送子程序
;===================================
DSEND:
MOV R0, #D_F ;第一个显示数据缓冲区地址放入R0
MOV R6, #8 ;发送N字节(1行)
DSE1: MOV R7, #8 ;每次发送8位
MOV A, @R0 ;显示数据放入A
;CPL A ;取反A
DSE2: RLC A ;将A的内容按位移入C
MOV S_I, C ;将C的内容送数据总线
CLR SCK
NOP
SETB SCK ;输出移位脉冲
DJNZ R7, DSE2 ;8位未发送完继续
INC R0 ;修改地址指针
DJNZ R6, DSE1 ;字节数未发送完继续
;--------屏幕左移一位---------------
MOV A, D_MB ;移动位次数放入A
JZ TAMEND ;为0转移
MOV R7, D_MB ;移动位次数放入R7
MOV A, @R0 ;移入的数据存入A
;CPL A ;取反A
DSE3: RLC A ;将A的内容按位移入C
MOV S_I, C ;将C的内容送数据总线
CLR SCK
NOP
SETB SCK ;输出移位脉冲
DJNZ R7, DSE3 ;移位次数未完继续
;--------移位时间修正---------------
TAMEND: CLR C ;清C
MOV A, #7
SUBB A, D_MB ;需要再延时的次数
JZ D_OUT
MOV R7, A
TA1:
DJNZ R7, TA1 ;空操作(延时)
D_OUT: RET
;****************************************
DELAY:
MOV R4,#5
D1:MOV R3,#25
DJNZ R3,$
DJNZ R4,D1
RET
;====================================
; 行选表
;====================================
TAB: DB 00H,08H,04H,0CH,02H,0AH,06H,0EH,01H,09H,05H,0DH,03H,0BH,07H,0FH
;====================================
; 文字编码表
;====================================
DTAB:
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0DFH,0EEH,0EEH,02H,0FAH,0F6H,0EEH,0C6H,0ABH,6BH,0EFH,0EFH,0EEH,0EEH,0EDH,0EBH
DB 0FFH,07H,0F7H,0F7H,0F7H,0F7H,0F7H,07H,6FH,6FH,6FH,6FH,0EDH,0EDH,0EDH,0F1H;"祝",1
DB 0FEH,0FEH,0FEH,0FEH,0FEH,00H,0FEH,0FDH,0FDH,0FDH,0FBH,0FBH,0F7H,0EFH,0DFH,0BFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,01H,0FFH,7FH,7FH,0BFH,0BFH,0DFH,0EFH,0E7H,0F1H,0FBH;"大",2
DB 0FDH,0FEH,0C0H,0BFH,0A0H,0FEH,0FDH,0F0H,8DH,0FBH,0E6H,99H,0E7H,9FH,0FAH,0FDH
DB 0FFH,0FFH,01H,0FBH,17H,0FFH,0FFH,0DFH,4FH,3FH,3FH,4FH,71H,7BH,0FFH,0FFH;"家",3
DB 0FDH,0FDH,80H,0FBH,0FBH,0F7H,0E7H,0E8H,0CFH,0AFH,6FH,0EFH,0EFH,0E8H,0EFH,0FFH
DB 0FFH,0FFH,01H,0FFH,0FFH,0BFH,0BFH,03H,0BFH,0BFH,0BFH,0BFH,0BFH,01H,0FFH,0FFH;"在",4
DB 0EFH,0F7H,80H,0DDH,0EBH,00H,0F7H,0F7H,00H,0F7H,0D3H,0D5H,0B5H,76H,0D5H,0EFH
DB 0FFH,0F1H,8FH,0BFH,0BFH,81H,0B7H,0B7H,0B7H,0B7H,0B7H,77H,77H,0F7H,0F7H,0F7H;"新",5
DB 0EFH,0EFH,0DFH,83H,0BAH,0BAH,0B9H,83H,0BBH,0BBH,0BBH,0BBH,83H,0BBH,0BFH,0FFH
DB 7FH,7FH,7FH,03H,0FBH,0FBH,0FBH,7BH,0BBH,9BH,0DBH,0FBH,0FBH,0D7H,0EFH,0FFH;"的",6
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,80H,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FBH,01H,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH;"一",7
DB 0F7H,0F0H,0EFH,0EFH,0DFH,0B0H,77H,0F7H,0F7H,0F7H,00H,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,03H,7FH,7FH,7FH,07H,7FH,7FH,7FH,7FH,01H,7FH,7FH,7FH,7FH,7FH;"年",8
DB 0C0H,0DEH,0DEH,0DEH,0C0H,0DEH,0DEH,0C0H,0FEH,0FEH,0C0H,0FEH,0FEH,0FEH,00H,0FFH
DB 07H,0F7H,0F7H,0F7H,07H,0F7H,0F7H,07H,0FFH,0FFH,07H,0FFH,0FFH,0FFH,01H,0FFH;"里",9
DB 0FDH,0FBH,0F0H,0F7H,0F0H,0F7H,0F0H,0F7H,0F7H,80H,0FFH,0FEH,0F9H,0E7H,9FH,0FFH
DB 0FFH,0FFH,0FH,0EFH,0FH,0EBH,09H,0EBH,0E7H,01H,8FH,6FH,0EFH,0EFH,0AFH,0DFH;"身",10
DB 0EFH,0E7H,0EFH,0DFH,0C8H,9FH,5FH,0DEH,0DEH,0DDH,0DBH,0D4H,0DFH,0DFH,0DFH,0FFH
DB 0BFH,0BFH,0BFH,0BFH,03H,3FH,1FH,9FH,0AFH,0B7H,0B1H,0BH,0BFH,0BFH,0BFH,0FFH;"体",11
DB 0EFH,0EFH,0D2H,0DBH,9AH,57H,0D0H,0DDH,0DDH,0CDH,0D2H,0DBH,0D5H,0CEH,0DFH,0FFH
DB 0DFH,0DFH,07H,0D7H,01H,0D7H,07H,0DFH,07H,0DFH,03H,0DFH,0DFH,5FH,03H,0FFH;"健",12
DB 0FEH,0FFH,0C0H,0DFH,0D0H,0DFH,0C0H,0DFH,0D0H,0D7H,0DBH,0DDH,0DBH,0A7H,0B5H,7EH
DB 0FFH,7FH,01H,7FH,07H,77H,01H,77H,07H,7FH,37H,27H,5FH,67H,71H,0FBH;"康",13
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0CFH,0CFH,0EFH,0DFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH;"，",14
DB 0FFH,81H,0BDH,0B5H,0B5H,0B5H,0B5H,0B5H,0B5H,0B5H,0F7H,0EBH,0EDH,0DCH,0BDH,7FH
DB 0F7H,0F7H,0F7H,0F7H,01H,0E7H,0E7H,0D7H,0D7H,0B7H,0B7H,77H,0F7H,0F7H,0D7H,0EFH;"财",15
DB 0BFH,0D8H,0DBH,0FBH,7AH,0AAH,0EAH,0EAH,0DAH,0DBH,3BH,0BBH,0B6H,0B5H,0AFH,0BFH
DB 0FFH,01H,0BFH,7FH,03H,0FBH,03H,0FBH,03H,0DFH,57H,5BH,0DDH,0DDH,5FH,0BFH;"源",16
DB 0FEH,0FFH,0C0H,0DFH,0DFH,0DFH,0DFH,0DFH,0DFH,0DFH,0DFH,0DFH,0BFH,0BFH,7FH,0FFH
DB 0FFH,7FH,01H,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH;"广",17
DB 0FEH,0BEH,0DEH,0C8H,0DEH,0FEH,0FEH,08H,0EEH,0EEH,0EDH,0EDH,0EBH,0D7H,0B8H,0FFH
DB 0EFH,0EFH,0EFH,03H,0EFH,0EFH,0EFH,01H,0EFH,0EFH,0EFH,0EFH,0EFH,0FFH,01H,0FFH;"进",18
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0CFH,0CFH,0EFH,0DFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH;"，",19
DB 0FFH,80H,0FDH,0FDH,0FDH,0FCH,0FDH,0FBH,0FBH,0FBH,0F7H,0F7H,0EFH,0DFH,0BFH,0FFH
DB 0FFH,01H,0FFH,0FFH,0EFH,07H,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,1FH,0BFH,0FFH;"万",20
DB 0FEH,00H,0FEH,0E0H,0EEH,0E0H,0FEH,0C0H,0FEH,00H,0FEH,0C0H,0FEH,0F6H,0FAH,0FDH
DB 0FFH,01H,0FFH,07H,0F7H,07H,0FFH,07H,0F7H,01H,0F7H,07H,0F7H,0FFH,0FFH,0FFH;"事",21
DB 0FFH,0C3H,0DAH,0DAH,0C2H,0D9H,0DBH,0DBH,0C2H,0DBH,0DBH,0DBH,0BBH,0A8H,77H,0FFH
DB 0DFH,0DFH,0DFH,0DFH,03H,0DFH,0DFH,0DFH,03H,0DFH,0DFH,0DFH,0DFH,01H,0FFH,0FFH;"胜",22
DB 0FEH,0C0H,0F7H,0FBH,00H,0FFH,0E0H,0EDH,0EEH,0E0H,0FFH,0D6H,0D7H,97H,0F8H,0FFH
DB 0FFH,03H,0DFH,0BFH,01H,0FFH,0FH,0EFH,0EFH,0FH,0FFH,0F7H,7BH,0EBH,0FH,0FFH;"意",23
DB 0FFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0EFH,0FFH,0EFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH;"！",24
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH,0FFH
END
你大概没有明白拖影的原因 1.拖影在你的数据区数据变化时某些行送出了不正确的数据。 2.行切换时显示数据不正确，比如你没灭上一行就开了下一行或者你已经开了下一行而数据还是上一行的。
如果静态数据扫得再慢也不会拖影，拖影和扫描的关系是扫描频率越高拖影就越严重，因为扫得越快时间差的比值越大。
情况1好解决，用两个缓冲区等刷屏开始时切换缓冲区就行了
情况2是主要的原因，我上面提到的是针对情况2的。
[ 本帖最后由 huo_hu 于 2012-2-22 23:05 编辑 ]
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