单元板显示.asm

led屏显示 595 C语言led屏显示 595 C语言 led屏显示 595 C语言

SDATA_595 EQU P1.2        ;串行数据输入
SCLK_595  EQU P1.7        ;移位时钟脉冲
RCK_595   EQU P1.6         ;输出锁存器控制脉冲
EN        EQU P1.5        ;使能控制脉冲

CHECK1    EQU P2.0
CHECK2    EQU P2.1
;=====================================================
	ORG 0000H
	LJMP MAIN
	ORG 0030H
;=====================================================
MAIN:
	MOV  SP,#60H
        MOV  R0,#00H
	MOV  R2,#00H
	CLR  EN
MAIN1:

	CALL OUT_595
        SETB EN
	MOV A,R2
        MOV  C,ACC.0
	MOV  CHECK2,C
        MOV  C,ACC.1
        MOV  CHECK2,C
        CLR   RCK_595
       	NOP
       	SETB  RCK_595 
        CLR   EN
	CALL DELAY
	INC  R2
	CJNE R2,#4H,MAIN1
        MOV  R0,#00H
	MOV  R2,#00H
	JMP  MAIN1
;----------------------------------------------------------------------
;输出锁存器输出数据子程序
;----------------------------------------------------------------------

OUT_595:
       	MOV  R1,#08H  ;有几个595
       	LCALL WR_595
              ;上升沿将数据送到输出锁存器
       	RET
;---------------------------------------------------------------------
;移位寄存器接收数据子程序
;---------------------------------------------------------------------
WR_595:
       	MOV  A,R0
       	MOV  DPTR,#TABLE
      	MOVC A,@A+DPTR 	
       	MOV  R4,#08H
WR_LOOP:
       	CLR  SCLK_595 
      	RLC  A
      	MOV  SDATA_595,C
      	SETB SCLK_595        ;上升沿发生移位
      	DJNZ R4,WR_LOOP
        INC  R0
       	DJNZ R1,WR_595
       	RET
;--------------------------------------------------------------------
;延时子程序
;--------------------------------------------------------------------

DELAY:
	MOV  R6,#25H
DEL0:
	MOV  R7,#10H
	DJNZ R7,$
	DJNZ R6,DEL0
	RET
;-------------------------------------------------------------------
;加载的数据库
;-------------------------------------------------------------------
TABLE:
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	DB   55H,55H,55H,55H
	END