数字波形发生器.docx

西安理工大学微机原理课设 .MODEL TINY EXTRN Display8:NEAR,GetKeyB:NEAR ;建立显示、按键链接 .STACK 512 .DATA BUFFER DB 8 DUP(?) LZ DB 2 DUP(?) F1 DB ? BO1 DB ? C1 DB ? .CODECT8255 EQU 0D003H ;8255片选采用CS3B8255 EQU 0D001HDA0832 EQU 0E000H ;DA0832片选采用CS2IO8259_0 EQU 0F000H ;8259片选采用CS1 IO8259_1 EQU 0F001HI8253_0 EQU 0C000H ;8253片选采用CS4I8253_3 EQU 0C003HCMD_8279 EQU 0BF01H ;8279片选采用CS5START: MOV AX,@DATAMOV DS,AXMOVES,AXNOPCALL Init8259CALL WRITERMOV AL,82HMOV DX,CT8255OUT DX,ALCALL INIT8253BJZBB:MOV DX,B8255IN AL,DXTEST AL,80HJNZ PLCALL GetKeyB ;录波形BO1MOV BO1,ALJMP XSPL:CALL INIT8253 ;录频率XS: CALL LEDDISPLAYSTI ;开中断LEA DI,TABLL:MOV DX,B8255 ;录幅值F1IN AL,DXAND AL,07H MOV F1,ALMOV C1,5MOV DX,CMD_8279 ;将AL低四位与00比较，一样跳转到JZBB，不一样跳转到LLIN AL,DXAND AL,0FHCMP AL,00HJNE JZBBJMP LLINIT8253 PROC NEAR ;8253初始化LEA SI,LZMOV DX,I8253_3MOV ALOUT DX,ALMOV DX,I8253_0CALL GetKeyB ;录8253初值MOV [SI],ALCALL GetKeyBMOV [SI+1],ALMOV DX,I8253_0MOV AL,[SI+1]OUT DX,ALMOV AL,[SI]OUT DX,ALRETINIT8253 ENDPINIT8253B PROC NEAR ;8253初始化MOV DX,I8253_3MOV ALOUT DX,ALMOV DX,I8253_0MOV AX,1000OUT DX,ALMOV AL,AHOUT DX,ALRETINIT8253B ENDPWRITER PROC NEAR ;设置中断向量表PUSH ESMOV AX,0MOV ES,AXMOV DI,20HLEA AX,INT_0STOSWMOV AX,CSSTOSWPOP ESRETWRITER ENDP Init8259PROCNEAR ;8259初始化MOVDX,IO8259_0MOVAL,13HOUTDX,ALMOVDX,IO8259_1MOVAL,08HOUTDX,ALMOVAL,09HOUTDX,ALMOVAL,0FEHOUTDX,ALRETInit8259ENDPSTART1:JMP START ;中途跳转INT_0: ;中断执行程序PUSH AXBG:MOV AL,BO1AND AL,0FHCMP AL,01HJZ JCBBCMP AL,02HJZ SJBBCMP AL,03HJZ FBBCMP AL,04HJZ ZXBBMOVDX,IO8259_0 ;EOI结束中断 MOVAL,20HOUTDX,ALPOP AXIRETJCBB: ;锯齿波AGAIN1:INC BLMOV DX,DA0832MOV AL,BLMUL F1 ;幅值F1MOV C1,5DIV C1OUT DX,ALMOVDX,IO8259_0MOVAL,20HOUTDX,ALPOP AXIRETSJBB: ;三角波CMP CL,128JA DOWNUP:INC BLJMP PODOWN:DEC BL PO: MOV DX,DA0832MOV AL,BLMUL F1MOV C1,5DIV C1OUT DX,ALMOV DX,IO8259_0MOV AL,20HOUT DX,ALPOP AXINC CLCMP CL,0JZ PIIRETPI:XOR BL,BLIRETZXBB:JMP ZXB