Project Description
Microprocessors Laboratory
EEL 4743 -- Fall 1998
Create a program that acts as a basic calculator for two-digit
numbers. The program should provide the user with addition,
subtraction, and multiplication features for any two two-digit
numbers.
When the program starts, it should display a ``0'' on the first line
of the LCD display, as illustrated in Figure 1(a). When the
user enters the first number, for example ``12'', it should replace
the zero on the display as shown in Figure 1(b). The user
will next press a key on the hex keypad that indicates the desired
arithemetic operation for which the program should print the
appropriate operator. For instance, if the user presses ``A'' for
addition, the program will then print a ``+'' as shown in
Figure 1(c). If the user presses one of these keys before
entering both digits of the first number, the program will use either
zero or the single digit number, accordingly. Next, the user will
enter the second two digit number, for example ``24'' as presented in
Figure 1(d). The user will then press ``E'' (for equals)
to perform the desired operation, at which time the program should
print ``='' and the result, as shown in Figure 1(e).
However, if the user presses ``E'' before specifying two digits for
the second number, the program should either print a zero or a single
number, accordingly. The program should then move the cursor to the
next line and again print ``0'' to indicate it is ready for use, as
shown in Figure 1(f). If the user presses ``C'' (for
clear) at any time, the program should clear the current line and
print ``0'' to start a new iteration. The keys and their
correpsponding operations are given in Table 1.
Figure 1:
Various stages of program operation
![\begin{figure}
\begin{center}
\subfigure[]{
\fbox {\parbox[c][1.8\baselines...
...{\screenwidth}{\normalsize\ttfamily12 + 24 = 36\ 0}}
} \end{center}\end{figure}](img1.gif) |
Table 1:
Arithmetic Operations
| Key |
Operator |
Operation |
|---|
| A |
+ |
addition |
| B |
- |
subtraction |
| C |
|
clear |
| F |
x |
multiplication |
| E |
= |
equals |
| D |
/ |
division (Extra Credit) |
The program should use the SCI for communications with the ULDP1 lab
board.
Some hints are provided below.
- Use the sciinit, scixmit, scirx
routines developed in Assigment 8.
- Convert all numbers to binary. In other words, for each number
perform
if both digits are entered. Likewise,
convert all results to their equivalent decimal representations when
printing, using the algorithm we developed in Assignment 9. To do
so, you can simply modify the two-digit number routines from
Assignment 8.
- Modular programming techniques will help you tremendously!
Provide a division function that is used if the user presses ``D''
after entering the first number. To indicate that the program is
performing division, it should print a ``/'' between the two numbers.
The program should display the result with two digits to the right of
the decimal point. It should not print leading zeros.
The report should contain the following sections in accordance with
the Formal Lab Report format: Purpose, Theory, Results and Appendix.
Note the omission of the Procedure section.
- The Purpose section should simply explain the purpose of the
program.
- The Theory section should explain any algorithms the program
uses. Examples are the routines for accepting numbers and
converting between decimal and binary.
- The Results section should include a sample session of using the
program. Also indicate in this section any criteria given in the
above program description that your program does not successfully
meet.
- The Appendix should consist of the program source code with
comments.
In lieu of completing the required class project, you may elect to
write a paper discussing a topic related to this course. If you
choose this option, please have your topic approved by me in advance
so that we can agree on the scope of your paper. Some possible topics
for a paper relating to microprocessors or embedded systems are
suggested below:
- Microprocessor Architectures
- Real-time Embedded Systems
- Programming Languages for Embedded Systems Development
- Development Tools
- Embedded Systems Applications
Together, the working project on disk with
accompanying report or paper submission is due on December
, 1998 at 5:00 PM in my mailbox, lest your
project grade will automatically suffer 10 points.
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