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

Calculate the propagation delay for output, Problem: (a) Consider the ...

Problem: (a) Consider the following combinational circuit: (i) Calculate the propagation delay for each output. Assume each gate has a delay of 10 ns. (ii) The abo

Non-repudiation achieved in designing e-cash based system, How can non-repu...

How can non-repudiation be achieved into designing e-cash based system? E-cash is fundamentally an online solution. The buyer should validate the coins by the issuer so as to g

Explain the techniques used for protection of user files, Explain the techn...

Explain the techniques used for protection of user files. This is easier to protect against accidental than malicious misuse. Protection of user files implies that file owne

State the process of development of object oriented analysis, The Process o...

The Process of Development The approach to development can be an iterative one. It involves repeated refinement of the object model. The process needs to be controlled by an a

Other equivalences, Equivalences: In this following miscellaneous equi...

Equivalences: In this following miscellaneous equivalence rules are often useful during rewriting sessions. So there the first two allow us to completely get rid of implicatio

Programming, DADA Electronics makes CD players in 3 processes: programming,...

DADA Electronics makes CD players in 3 processes: programming, and packaging. Direct materials are added at the starting of the assembly process. Conversion costs are incurred even

Responsibilities of objects, The Transaction object is responsible for read...

The Transaction object is responsible for reading the transaction file, finding the relevant account in the array of customers and applying the transaction. To find the relevant ac

What is a reference string, What is a reference string? An algorithm is...

What is a reference string? An algorithm is evaluated by running it on a exacting string of memory references and computing the number of page faults. The string of memory refe

Explain addressing modes in risc, Q. Explain Addressing modes in RISC? ...

Q. Explain Addressing modes in RISC? Simple addressing modes: Another benefit is the use of simple addressing modes. RISC machines employ simple register addressing having disp

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