模拟汽车速度控制系统的设计（汇编语言）+ 详细设计报告

;数据段 DATA SEGMENT IO8255_A EQU 288H IO8255_B EQU 289H IO8255_C EQU 28AH IO8255_K EQU 28BH LEDTABLE DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH ;段码 KEYTABLE DB 077h,07Bh,07Dh,07Eh,0B7h,0BBh,0BDh,0BEh DB 0D7h,0DBh,0DDh,0DEh,0E7h,0EBh,0EDh,0EEh ;键盘扫描码表 KEY DB '0123456789ABCDEF' buffer_bin DB 0,0,0 ;LED输出缓冲区，个十百位 buffer_hex DW 0 ;LED输出缓冲区，十六位 LED_bit DB ? ;位码值缓存 global_state DB 0 ;=0停止，1启动第一档,2第二档，3第三档 limit DW 0,0 ;限速设置，最低，最高 speed_state DB 0 ;=0匀速，<0减速，>0加速 abs_a DB 1 ;=1起始值，避免循环65536次，其余值为加速度绝对值 levelflag DB 0 ;1表示刚启动 DATA ENDS ;代码段 CODE SEGMENT ASSUME CS:CODE,DS:DATA START: ;程序起始 MOV AX,DATA MOV DS,AX MOV DX,IO8255_K MOV AL,10000001B ;将8255设为A、B口输出、C口上半输出下半输入 OUT DX,AL MAIN: ;主要循环 call scan4x4Keyboard ;扫描键盘，控制状态变量 call setSpeed call lightLED ;检测是否退出 MOV AH,01 INT 16H CMP AL,1BH ;判断是否键入ESC JE EXIT JMP MAIN ;键入ESC EXIT: ;清空键盘缓冲区 MOV AH,00 INT 16H ;内存变量全部恢复初始化 MOV global_state,0 MOV speed_state,0 MOV abs_a,1 MOV buffer_hex,0 call bufferSync MOV AX,0 JMP MAIN ;扫描键盘输入 scan4x4Keyboard PROC ;寄存器保存 PUSH DX PUSH AX PUSH BX PUSH SI PUSH DI PUSH CX ;反转法识别键盘 MOV DX,IO8255_C MOV AL,00000000B ;八位为行3210列3210，此处使行输出0 OUT DX,AL IN AL,DX ;读取列值到低四位 CMP AL,0FH ;判断低四位是否有0 JZ endOfScan4x4Keyboard STEP1: PUSH AX PUSH AX MOV DX,IO8255_K MOV AL,10001000B ;将8255设为A、B口输出、C口上半输入下半输出 OUT DX,AL MOV DX,IO8255_C POP AX ;恢复上次扫描到的列值，低四位有效 OUT DX,AL ;将列值输出到列 IN AL,DX ;读取行值到高四位 AND AL,0F0H;清空低四位 POP BX ;再次恢复上次扫描到的列值，低四位有效 AND BL,0FH;清空高四位 MOV AH,AL ;行值移到AH高4位 ADD AH,BL ;列值移到AH低4位，此时行列值合并到AH MOV SI,OFFSET KEYTABLE MOV DI,OFFSET KEY MOV CX,16 ;4x4键盘共16个键需要比对 STEP2: CMP AH,[SI] JZ STEP3 INC SI INC DI LOOP STEP2 ;未找到，恢复8255初始模式 MOV DX,IO8255_K MOV AL,10000001B ;将8255设为A、B口输出、C口上半输出下半输入 OUT DX,AL JMP endOfScan4x4Keyboard ;未找到键 STEP3: MOV DL,[DI] CMP DL,'1' JZ SWITCHL1 JMP NEXTCMP0 NEXTCMP0: CMP DL,'0' JZ SWITCHL0 JMP NEXTCMP1 SWITCHL0: ;MOV [global_state],1 MOV [speed_state],0 JMP endOfScan4x4Keyboard SWITCHL1: MOV [global_state],1 MOV limit[0],5H MOV limit[2],25H CMP [buffer_hex],5H JB UP CMP [buffer_hex],25H JA DOWN JMP endOfScan4x4Keyboard NEXTCMP1: CMP DL,'2' JZ SWITCHL2 CMP DL,'3' JZ SWITCHL3 JMP NEXTCMP2 SWITCHL2: MOV [global_state],2 ;第二档 MOV limit[0],25H MOV limit[2],60H CMP [buffer_hex],25H JB UP CMP [buffer_hex],60H JA DOWN JMP endOfScan4x4Keyboard SWITCHL3: MOV [global_state],3 ;第三档 MOV limit[0],60H MOV limit[2],120H CMP [buffer_hex],60H JB UP JE DOWN CMP [buffer_hex],120H JA DOWN JMP endOfScan4x4Keyboard NEXTCMP2: CMP DL,'A' JZ SPEEDUPL1 CMP DL,'B' JZ SPEEDUPL2 CMP DL,'C' JZ SPEEDDOWNL1 CMP DL,'D' JZ SPEEDDOWNL2 JMP endOfScan4x4Keyboard SPEEDUPL1: MOV [levelflag],0 MOV [speed_state],1 ;加速 MOV [abs_a],30 ;慢加速 JMP endOfScan4x4Keyboard SPEEDUPL2: MOV [levelflag],0 MOV [speed_state],1 ;加速 MOV [abs_a],15 ;快加速 JMP endOfScan4x4Keyboard SPEEDDOWNL1: MOV [speed_state],-1 ;加速 MOV [abs_a],30 ;慢刹车 MOV LIMIT[0],0 JMP endOfScan4x4Keyboard SPEEDDOWNL2: MOV [speed_state],-1 ;加速 MOV [abs_a],15 ;急刹车 MOV LIMIT[0],0 JMP endOfScan4x4Keyboard ;换挡时动力不足或过高导致的加减速 UP: MOV [levelflag],1 MOV [speed_state],1 ;加速 MOV [abs_a],60 ;升档加速 JMP endOfScan4x4Keyboard DOWN: MOV [levelflag],1 MOV [speed_state],-1 ;加速 MOV [abs_a],60 ;掉档减速 JMP endOfScan4x4Keyboard endOfScan4x4Keyboard: ;寄存器恢复 POP CX POP DI POP SI POP BX POP AX POP DX RET scan4x4Keyboard ENDP ;显示数码管 lightLED PROC ;保护寄存器 PUSH DI PUSH BX PUSH CX PUSH SI PUSH DX ;软件延时实现单端复用 MOV DI,OFFSET buffer_bin MOV CH,0 MOV CL,abs_a LEDLOOP1: MOV BH,02 LEDLOOP2: MOV [LED_bit],BH ;保存位码以节约BH寄存器 PUSH DI MOV BH,0 MOV BL,LED_bit ADD DI,BX MOV BL,[DI] ;BL为要显示的数字 POP DI MOV BH,0 ;清空BH以便加法运算 MOV SI,OFFSET LEDTABLE ADD SI,BX ;SI为要输出数字的段码地址 MOV AL,BYTE PTR [SI] ;AL为要输出的段码 MOV DX,IO8255_A OUT DX,AL PUSH CX MOV BH,1 MOV CL,LED_bit SHL BH,CL MOV AL,BH ;使对应数码管亮 POP CX PUSH CX CMP global_state,0 JE SKIPSTATELED MOV CH,0 MOV CL,global_state MOV AH,100000B STATELED: ADD AL,AH SHL AH,1 LOOP STATELED SKIPSTATELED: POP CX MOV DX,IO8255_B OUT DX,AL ;B口输出位码 PUSH CX MOV CX,100 DELAY: LOOP DELAY ;延时 POP CX MOV AL,00H OUT DX,AL DEC BYTE PTR [LED_bit] MOV BH,LED_bit JNS LEDLOOP2 ;循环复用驱动多个数码管 LOOP LEDLOOP1 ;循环延时后再增速度 ;恢复寄存器 POP DX POP SI POP CX POP BX POP DI RET lightLED ENDP ;速度设置 setSpeed PROC PUSH AX MOV AX,WORD PTR [buffer_hex] CMP [global_state],0 JE endOfSetSpeed CMP [global_state],1 JE BASICCHECK BASICCHECK: CMP [speed_state],0 JE STATICSPEED JNS SETSPEEDUP JS SETSPEEDDOWN STATICSPEED: JAE endOfSetSpeed SETSPEEDUP: CMP levelflag,1 JE LEVELUP JMP NORMALUP LEVELUP: CMP AX,limit[0] ;小于最低速加速 JAE endOfSetSpeed NORMALUP: CMP AX,limit[2] ;大于等于最高速不加速 JAE endOfSetSpeed CLC ;防止DAA的时候干扰 INC AX DAA ADC AH,0 MOV WORD PTR [buffer_hex],AX call bufferSync JMP endOfSetSpeed SETSPEEDDOWN: CMP levelflag,1 JE LEVELDOWN JMP NORMALDOWN LEVELDOWN: CMP AX,limit[2] ;大于最高速减速 JBE endOfSetSpeed NORMALDOWN: CMP AX,limit[0] ;小于等于最低速不减速 JBE endOfSetSpeed DEC AX DAS MOV WORD PTR [buffer_hex],AX call bufferSync JMP endOfSetSpeed endOfSetSpeed: POP AX RET setSpeed ENDP ;LED缓冲区同步 bufferSync PROC ;保存寄存器 PUSH AX PUSH DX MOV AX,[buffer_hex] MOV DL,AL AND DL,0FH ;取低四位（个位） MOV buffer_bin[0],DL MOV DL,AL AND DL,0F0H ;取高四位（十位） PUSH CX MOV CL,4 SHR DL,CL POP CX MOV buffer_bin[1],DL MOV DL,AH AND DL,0FH ;取第四位（百位） MOV buffer_bin[2],DL ;恢复寄存器 POP DX POP AX RET bufferSync ENDP CODE ENDS