Hello

I want programs to interface any sensors with 8086 microprocessor using 8255. Programs other than for sensors are also okay (but would be good if i got for sensors) except for adc, dac, keyboard, stepper motor and led.

I need the program urgent. I searched as much as i could but did not find any programs for interfacing.

Thanks in advance.

 

have you tried, like, writing it yourself? Maybe start with the datasheet of the 8255 and go from there.

 

What? There's no ap for that?

 

And anyway, why would you want to use such ancient technology as 8086 + 8255, when almost any new microcontroller can outpreform it without any peripheral circuits added?

 

i have this program for now which is for temperature sensor ad590. but i have temperature sensor for pt100. so i'm not sure if this program is gonna work

In this part below i understand that the port a,b,c of 8255 are connected to the given address but what does the next 3 statements mean?

PORTA EQU FFC0H ; PORTA address
PORTB EQU FFC2H ; PORTB address
PORTC EQU FFC4H ; PORTC address
CTL EQU FFC6H ; Control port address
CTL_BYTE EQU 98H ; 8255 control reg.
CLEAR_DISPLAY EQU F800:4BB1H
DWAD EQU F800:4BB1H
DBDTA EQU F800:4F1F

and further down there is this statement
CALL FAR DWAD
does it mean that DWAD is a subroutine?

MODEL SMALL
.STACK 100
.DATA
START:
PORTA EQU FFC0H ; PORTA address
PORTB EQU FFC2H ; PORTB address
PORTC EQU FFC4H ; PORTC address
CTL EQU FFC6H ; Control port address
CTL_BYTE EQU 98H ; 8255 control reg.
CLEAR_DISPLAY EQU F800:4BB1H
DWAD EQU F800:4BB1H
DBDTA EQU F800:4F1F
DEC_TEMP DB 0
SET_TEMP DB 0
ADC_VAL DB 0
COUNT DB 0
PRE_TEMP DB 0
.CODE
ADC TABLE:

DB 00H,03H,05H,08H,0aH,0dH,0fH,11H,14H,16H


DB 19H,1cH,1eH,21H,24H,27H,2aH,2cH,2eH,32H

DB 34H,36H,39H,3cH,3fH,42H,45H,48H,4aH,4cH

DB 4eH,50H,52H,54H,56H,58H,5bH,61H,64H,67H

DB 6aH,6dH,70H,72H,74H,77H,7aH,7dH,7fH,82H 

DB a0H,a2H,a5H,a8H,aaH,aDH,afH,b0H,b3H,b6H

DB b9H,bcH,bfH,c1H,c4H,c6H,c9H,ccH,cfH,d0H

DB d2H,d5H,d7H,daH,dcH,dfH,e0H,e2H,e5H,e7H

DB e9H,ebH,eeH,f1H,f4H,f6H,f9H,fcH,ffH

START:
                     MOV AL,CTL_BYTE ; 8255
                     MOV DX,CTL ; PORTC (lower) as output
                     OUT DX,AL ; PORTA as input 
                      MOV AL,DEC_TEMP
	CALL DEC_HEX
	MOV SET_TEMP,AL
	MOV AL,DEC_TEMP
	MOV AH,00
	MOV SI,	AX
	CALL FAR DWAD
	MOV DX,CTL
	MOV AL,02
	OUT DX,AL
	MOV AL,00
	OUT DX,AL
	MOV CX,70
L0:
	LOOP L0
BACK:
	MOV COUNT,0
	CALL ADC
	CALL DISP_TEMP
	CALL TEMP_CONTL
	JMP BACK
DISP_TEMP:
	MOV AL,ADC_VAL
	MOV SI,OFFSET ADC_TABLE
AGAIN:
	CMP AL,[SI]
	JC FOUND
	JE FOUND
	INC SI
	INC COUNT
	JMP AGAIN
FOUND:
	MOV AL,COUNT
	CALL HEX_DEC
	MOV AH,0
	MOV SI,AX
	CALL FAR DBDTA
	RET
TEMP_CONTL:
	MOV AL,COUNT
	CMP AL,SET_TEMP
	JC TURN_ON_RELAY
RELAY_OFF:
	MOV DX,PORTB
	MOV AL,0FFH
	OUT DX,A	L
	MOV DL,20H
HERE1:
	MOV CX,FFFFH
HERE:
	LOOP HERE
	DEC DL	
	JNZ HERE1
RET
TURN_ON_RELAY:
	MOV DX,PORTB
	MOV AL,00H
	OUT DX,AL
CONTINUE:
	MOV CX,FFFFH
L22:
	LOOP L22
	RET
ADC:
	MOV DX,CTL
	MOV AL,01
	OUT DX,AL
	MOV CX,70
L10:
	LOOP L10
	MOV AL,00
	OUT DX,AL
L1:
	MOV DX,PORTC
	IN AL,DX
	AND AL,80H
	CMP AL,80H
	JNZ L1
	MOV DX,PORTA
	IN AL,DX
	MOV ADC_VAL,AL
	RET
HEX_DEC:
	MOV AH,00H
	MOV CL,0AH
	DIV CL
	MOV CL,04H
	ROL AL,CL
	AND AL,F0H
	OR AL,AH
	RET
DEC_HEX:
	MOV BL,AL
	AND BL,0FH
	AND AL,F0H
	MOV CL,04
	ROR AL,CL
	MOV CL,0AH
	MUL CL
	ADD AL,BL
	RET
END START

 

this is for my project!!

 

i have this program for now which is for temperature sensor ad590. but i have temperature sensor for pt100. so i'm not sure if this program is gonna work

In this part below i understand that the port a,b,c of 8255 are connected to the given address but what does the next 3 statements mean?

PORTA EQU FFC0H ; PORTA address
PORTB EQU FFC2H ; PORTB address
PORTC EQU FFC4H ; PORTC address
CTL EQU FFC6H ; Control port address
CTL_BYTE EQU 98H ; 8255 control reg.
CLEAR_DISPLAY EQU F800:4BB1H
DWAD EQU F800:4BB1H
DBDTA EQU F800:4F1F

and further down there is this statement
CALL FAR DWAD
does it mean that DWAD is a subroutine?
...
[/code]

As the first 3 statements do, the next three EQU statements, make those labels equal to the given values. That is done for a little easier readability.
I believe the Control port address is for the control port in the 8255 which is used to configure the ports A-C.

The CALL FAR is I believe a long call to a subroutine.