Write a program which collects in data samples, Computer Engineering

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Write a program which collects in data samples from a port at 1 ms interval. The upper 4 bits collected data same as mastered and stored in an array in successive locations.

; REGISTERS: Uses CS, SS, DS, AX, BX, CX, DX, SI, SP

; PROCEDURES: Uses WAIT

DATA_SEG       SEGMENT

            PRESSURE DW 100 DUP (0); Set up array of 100 words

NBR_OF_SAMPLES EQU 100    

            PRESSURE_PORT EQU 0FFF8h     ; hypothetical input port

DATA_SEG       ENDS

STACK_SEG SEGMENT STACK

            DW 40    DUP (0)    ; set stack of 40 words

STACK_TOP   LABEL WORD

STACK_SEG   ENDS

 

CODE_SEG SEGMENT

            ASSUME CS: CODE_SEG, DS: DATA_SEG, SS: STACK_SEG

START:           MOV   AX, DATA_SEG; Initialise data segment register

MOV DS, AX  

MOV AX, STACK_SEG   ; Initialise stack segment register

MOV SS, AX  

MOV SP, OFFSET STACK - TOP    ; initialise stack pointer top of 

                                                ; stack

LEA SI, PRESSURE; SI points to start of array 

     ; PRESSURE

MOV BX, NBR_OF_SAMPLES   ; Load BX with number

                        ; Of samples

MOV DX, PRESSURE_PORT   ; Point DX at input port

                                                ; It can be any A/D converter or 

                                                ; Data port.

READ_NEXT: IN AX, DX   ; Read data from port

            ; Please note use of IN instruction

            AND AX, 0FFFH; Mask upper 4 bits of AX

            MOV [SI], AX   ; Store data word in array

            CALL WAIT   ; call procedures wait for delay  

INC SI; Increment SI by two as dealing with 

INC SI; 16 bit words and not bytes

DEC BX; Decrement sample counter

JNZ READ_NEXT   ; Repeat till 100

      ; Samples are collected

STOP: NOP    

WAIT   PROC NEAR  

            MOV CX, 2000H   ; Load delay value

                                     ; Into CX

HERE:   LOOP HERE   ; Loop until CX = 0

            RET    

WAIT   ENDP    

CODE_SEG ENDS    

END    

Discussion:

Please consider that CALL to the procedure as above doesn't specify whether the call is to a FAR procedure or a NEAR procedure. This distinction is made at the time of defining the procedure. 

 

The procedure above can be converted in a FAR procedure by changing the definition of procedure as below:

WAIT              PROC FAR

 .

 .

WAIT             ENDS

The procedure can now be statedin another segment if the need to be, in same assembly language file.


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