【正文】 AL NEXT1_3: MOV BL,00H 。D/A轉(zhuǎn)換起始值 UP2: MOV AL,AMP AND AL,0F0H 。AMP=00H~FFH ,AL=00H~07H SHR AL,4 。即 BL變?yōu)?到 7倍 。默認(rèn)值A(chǔ)MP=7FH MUL BL MOV DX,DA0832 。啟動(dòng)D/A轉(zhuǎn)換 OUT DX,AL CALL DELAY2 INC BL CMP BL,25H JNE UP2 MOV BL,00H MOV AL,AMP AND AL,0F0H 。AMP=00H~FFH ,AL=00H~07H SHR AL,4 。即 BL變?yōu)?到 7倍 。默認(rèn)值A(chǔ)MP=7FH MUL BL MOV DX,DA0832 OUT DX,AL CALL DELAY2 。無(wú)鍵按下則繼續(xù)，有鍵按下則消抖 KEYBEGIN_3: CALL CCSCAN 。掃描按鍵 JNZ GETKEY1_3 。有鍵按下則跳置GETKEY_1 JMP GETKEY2_3 。無(wú)按鍵則繼續(xù)向下執(zhí)行 GETKEY1_3: CALL DELAY_SCAN 。有鍵壓下，延時(shí)消抖 CALL DELAY_SCAN CALL CCSCAN 。再次掃描按鍵 JNZ FANHUI3 。有鍵按下則跳置GETKEY2 GETKEY2_3: JMP JUCHI1 。否則跳回開(kāi)始繼續(xù)循環(huán) FANHUI3: RET JUCHI ENDP SINE PROC NEAR 。正弦波產(chǎn)生子程序 SINE1: MOV DX,MY8255_MODE 。 通過(guò)8255的C7口發(fā)出一個(gè)低電平 MOV AL,00001110B OUT DX,AL 。啟動(dòng)AD0809 MOV DX,MY8255_B 。 讀8255B口數(shù)據(jù) IN AL,DX MOV BL,FLAG_FUPIN 。判斷幅頻標(biāo)志位，默認(rèn)為0? CMP BL,0 JE PIN_4 。 為0則存為頻率值 MOV AMP,AL 。 不為0則存為振幅值 JMP NEXT1_4 PIN_4: MOV FRE,AL NEXT1_4: LEA SI,SIN MOV CX,255 UP: MOV BL,AMP AND BL,0F0H 。AMP=00H~FFH ,BL=00H~07H SHR BL,4 。即 AL變?yōu)?到 7倍。默認(rèn)值A(chǔ)MP=7FH MOV AL,[SI] SHR AL,2 MUL BL MOV DX,DA0832 。啟動(dòng)D/A轉(zhuǎn)換 OUT DX,AL CALL DELAY3 INC SI LOOP UP。無(wú)鍵按下則繼續(xù)，有鍵按下則消抖 KEYBEGIN_4: CALL CCSCAN 。掃描按鍵 JNZ GETKEY1_4 。有鍵按下則跳置GETKEY_1 JMP GETKEY2_4 。無(wú)按鍵則繼續(xù)向下執(zhí)行 GETKEY1_4: CALL DELAY_SCAN 。有鍵壓下，延時(shí)消抖 CALL DELAY_SCAN CALL CCSCAN 。再次掃描按鍵 JNZ FANHUI4 。有鍵按下則跳置GETKEY2 GETKEY2_4: JMP SINE1 。否則跳回開(kāi)始繼續(xù)循環(huán) FANHUI4: RET SINE ENDPDELAY_0809 PROC NEAR 。軟件延時(shí)子程序 PUSH CX PUSH AX MOV CX,4000H D1: MOV AX,0600H D2: DEC AX JNZ D2 LOOP D1 POP AX POP CX RETDELAY_0809 ENDP DELAY1 PROC NEAR 。軟件延時(shí)子程序 PUSH CX PUSH AX MOV CH,FRE 。讀取頻率值 AND CH,0F0H ADD CH,0FH MOV CL,0FFH DD1: MOV AX,0FF00H DD2: DEC AX JNZ DD2 LOOP DD1 POP AX POP CX RET DELAY1 ENDP DELAY2 PROC NEAR 。軟件延時(shí)子程序 PUSH CX PUSH AX MOV CH,FRE 。讀取頻率值 SHR CH,4 MOV CL,0FFH DY1: MOV AX,8000H DY2: DEC AX JNZ DY2 LOOP DY1 POP AX POP CX RET DELAY2 ENDP DELAY3 PROC NEAR 。軟件延時(shí)子程序 PUSH CX PUSH AX MOV CH,FRE 。讀取頻率值 SHR CH,4 MOV CL,0FFH D11: MOV AX,4000H D12: DEC AX JNZ D12 LOOP D11 POP AX POP CX RET DELAY3 ENDPDELAY_SCAN PROC NEAR 。軟件延時(shí)子程序 PUSH CX MOV CX,0F00H D1_SCAN: MOV AX,500H D2_SCAN: DEC AX JNZ D2_SCAN LOOP D1_SCAN POP CX RETDELAY_SCAN ENDP CODE ENDS END START附錄2 C語(yǔ)言源程序代碼include include include include include include //****************根據(jù)查看配置信息修改下列符號(hào)值*******************define IOY0 0xC400define IOY1 0xC440define IOY2 0xC480//*****************************************************************define DA0832 IOY0 + 0x00*4define MY8255_A IOY0 + 0x00*4define MY8255_B IOY0 + 0x01*4define MY8255_C IOY0 + 0x02*4define MY8255_MODE IOY0 + 0x03*4define AD0809 IOY0 + 0x00*4int cc。int b_n。int n。int sin[256]={ 100, 102, 105, 107, 110, 112, 115, 117, 120, 122, 124, 127, 129, 132, 134, 136, 139, 141, 143, 145,147, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 169, 171, 173, 175, 176, 178, 179, 181, 182,184, 185, 186, 187, 189, 190, 191, 192, 193, 194, 194, 195, 196, 197, 197, 198, 198, 199, 199, 199,200, 200, 200, 200, 200, 200, 200, 200, 199, 199, 199, 198, 198, 197, 197, 196, 195, 194, 194, 193,192, 191, 190, 189, 187, 186, 185, 184, 182, 181, 179, 178, 176, 175, 173, 171, 169, 168, 166, 164,162, 160, 158, 156, 154, 152, 150, 147, 145, 143, 141, 139, 136, 134, 132, 129, 127, 124, 122, 120,117, 115, 112, 110, 107, 105, 102, 100, 98, 95, 93, 90, 88, 85, 83, 80, 78, 76, 73, 71,68, 66, 64, 61, 59, 57, 55, 53, 50, 48, 46, 44, 42,