main.asm

这是接口课程设计时做的一个控制电机转动的程序

BASE_ADR_ADC0809 EQU 1400H
BASE_ADR_8255 EQU 1440H
BASE_ADR_8254 EQU 1460H

STACK SEGMENT STACK
	DB 100 DUP(?)
STACK ENDS

DATA SEGMENT PUBLIC
	frequency DB ? 	;the speed of stepping motor and singing
	;sequnce DB 05H,0CH,0AH,03H	;the driver of stepping motor
	;index DB 0H		;the index of array 
	direction DB 0H	;rotate direction,0 is ShunShiZhen and 1 is NiShiZhen
	;counter DB 0H
	motor DB 33H
DATA ENDS


CODE SEGMENT PUBLIC
	ASSUME CS:CODE,DS:DATA,SS:STACK	
	
	;驱动步进电机旋转
	rotate PROC NEAR
		PUSH SI
		PUSH DX
		PUSH AX
		
		CMP frequency,10h
		JL exitRotate
		
			;输出数据进行转动
		MOV AL,motor		
		MOV DX,BASE_ADR_8255
		ADD DX,02H
		OUT DX,AL
		CALL delay
		
		CMP direction,0h	;调节转动驱动数据
		JE clockwise
		JMP anticlockwise
		clockwise:		;顺时针旋转		
			ROL motor,1
			JMP exitRotate
		anticlockwise:	;逆时针旋转
			ROR motor,1				
	
		exitRotate:
			POP AX
			POP DX
			POP SI
			RET
	rotate ENDP	
	
	;初始化8255
	init8255 PROC NEAR
		PUSH DX
		PUSH AX
	
		MOV DX,BASE_ADR_8255	;A,B口输入，C口输出，都是方式0
		ADD DX,03H		
		MOV AL,92H
		OUT DX,AL
		NOP
		
		POP AX
		POP DX
		RET	
	init8255 ENDP
	
	;获得旋转方向
	getDirection PROC NEAR
		PUSH DX
		PUSH AX
		
		MOV DX,BASE_ADR_8255	;按键key0接8255A口,0为顺时针,1为逆时针	
		IN AL,DX
		AND AL,01H
		MOV direction,AL
		
		POP AX
		POP DX
		RET
	getDirection ENDP
	
	;停止8254计数,将gate0置为低电平
	stop8254 PROC NEAR
		PUSH DX
		PUSH AX
		
		MOV DX,BASE_ADR_8255	;pc4连接gate0控制8254，设置gate0为低电平禁止计数
		ADD DX,03H
		MOV AL,08H 
		OUT DX,AL 
		
		POP AX
		POP DX
		RET
	stop8254 ENDP
	
	;启动8254,将gate0置为高电平
	open8254 PROC NEAR
		PUSH DX
		PUSH AX
		
		MOV DX,BASE_ADR_8255	;pc4连接gate0控制8254，设置gate0为高电平启动计数
		ADD DX,03H
		MOV AL,09H 
		OUT DX,AL 
		
		POP AX
		POP DX
		RET
	open8254 ENDP
	
	;延时
	delay PROC NEAR
		PUSH CX
	
		MOV CX,0FFFFH
		delayCount:
			NOP
		LOOP delayCount
			
		POP CX	
		RET
	delay ENDP
	
	;获得电机旋转速度和蜂鸣器蜂鸣频率
	getFrequency PROC NEAR
		PUSH DX	
		PUSH AX	
		
		MOV DX,BASE_ADR_ADC0809	;启动AD转换
		OUT DX,AL
		CALL delay
		
		IN AL,DX	;取得AD转换结果,作为电机和蜂鸣器的频率
		CALL delay		
		CMP frequency,AL
		JE exitGetFrequency
		MOV frequency,AL		
		CALL setSigning
		
		exitGetFrequency:
			POP AX
			POP DX
			RET			
	getFrequency ENDP
	
	;设置蜂鸣频率
	setSigning PROC NEAR
		PUSH DX
		PUSH AX
		
		CALL open8254	
		
		CMP frequency,10H	;当从AD得到的数据小于16时停止蜂鸣
		JL  stopSigning
		stopSigning:
			CALL stop8254
			JMP exitSetSigning
			
		MOV DX,BASE_ADR_8254	;设置计数器0工作在方式3，BCD编码
		ADD DX,03H
		MOV AL,17H
		OUT DX,AL	
		MOV AL,255	;计数器值为255减去从AD得到的数据
		SUB AL,frequency		
		MOV DX,BASE_ADR_8254
		OUT DX,AL
		
		exitSetSigning:
			POP AX
			POP AX
			RET
	setSigning ENDP
	
	main PROC FAR
		start:
			MOV AX,DATA
 			MOV DS,AX
 			
			CALL init8255		
						
			next:	
				CALL getDirection
				CALL getFrequency			
				MOV CX,WORD PTR frequency

				speedCtrl:					
					CALL delay					
				LOOP speedCtrl
				
				CALL rotate
				
				MOV AH,0BH	;检测是否有键按下,若有则退出
				INT 21H
				CMP AL,0
				JNE exitMain
				LOOP next
			exitMain:
				NOP
	main ENDP
CODE ENDS 
	END START