Write a program which collects in data samples, Computer Engineering

Assignment Help:

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.


Related Discussions:- Write a program which collects in data samples

Explain in detail about operating system, Explain in detail about Operating...

Explain in detail about Operating Systems (OS) Operating system (OS) is a program which after being initially loaded into computer by a boot program, manages all the other appl

Define system space, Define system space.  Management routines are part...

Define system space.  Management routines are part of the operating system of the computer. It is suitable to assemble the OS routines into a virtual address space.

Show the internet protocols, A communication protocol is an agreement which...

A communication protocol is an agreement which specifies a common language two computers use to exchange messages. For instance, a protocol specifies exact format and meaning of ev

A universal shift register can shift in both the lef, #question.A universal...

#question.A universal shift register can shift in both the left-to-right and right-to-left directions, and it has parallel-load capability. Draw a circuit for such a shift register

Determine signed binary number, -8 is equal to which signed binary number ?...

-8 is equal to which signed binary number ? Ans. 10001000 is the signed binary number that equal to - 8.   To show negative numbers in the binary system, Digit 1 is utilized fo

Size of scripts and libraries, Main script section ("Sub Main .. End Sub) a...

Main script section ("Sub Main .. End Sub) and function bodies should fit within an A4-page (approx. two monitor-pages). If the code doesn't fit it is a candidate to do more decoup

What is class invariant in c++, A class invariant is a condition that descr...

A class invariant is a condition that describes all valid states for an object. It is a logical condition to make sure the correct working of a class. Class invariants must hold wh

Explain advantage of static storage class, Explain advantage of static stor...

Explain advantage of static storage class The second and more subtle use of 'static' is in connection with external declarations. With external constructs it provides a privacy

Flow charts, n=(x*2)/(1=0) the value x=0 and is used to stop the algerithin...

n=(x*2)/(1=0) the value x=0 and is used to stop the algerithin.The calculation is repeated using values of x=0 is input. There is only a need to check for error positions. The va

What is a metadata, What is a Metadata?  Metadata is information about ...

What is a Metadata?  Metadata is information about a PE. In COM, metadata is communicated by non-standardized type libraries. In .NET, this data is contained in the header port

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd