Embedded Systems: June 2013

Calculator with Assembly - PIC16F877

Detailed specifications of the program

Output
The result will be shown on the 7 segment display after entering number 1, number 2 and the operation.

Input

The input is taking from the keypad matrix based on PORTB by pressing on

1	2	3
4	5	6
7	8	9
*	0	#

Note:

You have to input 1st number then 2nd number then the operation
To input a number you have to enter it digit by digit then press #
Operations:

1 represent sum ( + )
2 represent subtract ( - )
3 represent multiply ( * )
4 represent divide ( / )

Program starts to enter number 1, when you hit "1" on the keypad now number 1 have "1".

Now hit "6" and number 1 will be "16"

To end editing in number 1 hit "#" and it will appear on the screen.

Now you have to enter number 2, hit "2" so number 2 is equal to "2".
Hit "#" to end editing and it will appear on the screen.

Now you have to enter the operation, hit "1" to sum the 2 numbers.

Now you have to enter the operation, hit "2" to subtract the 2 numbers.

Now you have to enter the operation, hit "3" to multiply the 2 numbers.

Now you have to enter the operation, hit "4" to divide the 2 numbers.

Program Properties

List of the used resources

Laptop with windows platform.
MPLAB X IDE v1.70 for developing.
PIC Simulator IDE for simulating PIC16F877 microcontroller.

Keypad Matrix
7 Segment Display

PIC C Language.

Keypad Matrix configuration

7 Segment Display configuration

Download Code here.

Fibonacci Series with Assembly - PIC16F877

The first 21 Fibonacci numbers F_n for n = 0, 1, 2, ..., 20 are:

F₀	F₁	F₂	F₃	F₄	F₅	F₆	F₇	F₈	F₉	F₁₀	F₁₁	F₁₂	F₁₃	F₁₄	F₁₅	F₁₆	F₁₇	F₁₈	F₁₉	F₂₀
0	1	1	2	3	5	8	13	21	34	55	89	144	233	377	610	987	1597	2584	4181	6765

Check Fibonacci Series here.

Detailed specifications of the program

Input

The input is taking from the keypad matrix based on PORTB by pressing on

1	2	3
4	5	6
7	8	9
*	0	#

Note:

To input a number you have to enter it digit by digit then press #

Program starts to enter the index of the Fibonacci number you wish to end at it.
So if you enter 8, the program with output the first 8 Fibonacci numbers: 0, 1, 1, 2, 3, 5, 8, 13
When you hit "8" on the keypad now number have "8". To end editing in number hit "#" and the Fibonacci Series will appear on the display.

Output

The output can appear on 7 Segment Display based on PORTD(Data Port) & PORTA(Control Port).
The series will appeared with delay between them.

Program Properties

List of the used resources

Laptop with windows platform.
MPLAB X IDE v1.70 for developing.
PIC Simulator IDE for simulating PIC16F877 microcontroller.

Keypad Matrix
7 Segment Display

PIC C Language.

Keypad Matrix configuration

7 Segment Display configuration

Download code here.

Merge Sort with C - PIC16F877

Detailed specifications of the program

Input

The input is taking from the keypad matrix based on PORTB by pressing on

1	2	3
4	5	6
7	8	9
*	0	#

Note:

Input 4 numbers (you can change it by changing the array size in the code).
To input a number you have to enter it digit by digit then press #

Program starts to enter number 1, when you hit "5" on the keypad now number 1 have "5". To end editing in number 1 hit "#" and it will appear on the screen.

Now you have to enter number 2, hit "6" so number 2 is equal to "6".
Now hit "6" again so number 2 is equal "66" now.
Hit "#" to end editing and it will appear on the screen.

Now you have to enter number 3, hit "1" so number 3 is equal to "1".
Now hit "9" so number 3 is equal "19" now.
Hit "#" to end editing and it will appear on the screen.

Now you have to enter number 4, hit "1" so number 4 is equal to "1".
Hit "#" to end editing and it will appear on the screen.

Output

The output can appear on 7 Segment Display based on PORTD(Data Port) & PORTA(Control Port).
The number will appeared sorted with delay between them.

Program Properties

List of the used resources

Laptop with windows platform.
MPLAB X IDE v1.70 for developing.
PIC Simulator IDE for simulating PIC16F877 microcontroller.

Keypad Matrix
7 Segment Display

PIC C Language.

Keypad Matrix configuration

7 Segment Display configuration

Download code here.

Pexeso Game with C - PIC16F877

Detailed specifications of the game

Input

The input is taking from the keypad matrix based on PORTB by pressing on

1	2 Move Up	3
4 Move Left	5 Flip	6 Move Right
7	8 Move Down	9
* Start new game	0	# Quit

Output

The output can appear on (4x20) LCD based on PORTD & PORTC.

· There is a screen for loading the game.

· There is a selection frame to move on folded cards.

· All cards have a question mark shape.

· Having 20 different shapes to use.

· There is a score count updates every time you get a score.

· There is a clicks count updates every time you click on any card.

· UI is some kind good and well organized.

Game Logic

These points are be handled

· Cursor is moving to anywhere in LCD with the above instructions.

· Selection frame is moving on fold cards and when flipping the shape must be appeared.

· Able to compare upon selecting two – More than two is not a LOGIC.

· When flip a folded card and flip it again, it turns to questions mark shape again.

· When selecting two cards and they are not matches, they will be a question mark shape again.

· When selecting two cards and they are matches, their cells will be empty.

· At any time when pressing ‘*’, it will start a new game.

· At any time when pressing ‘#’, it will quit the game.

Description of the implementation

Using only 0x00 to optimize the memory usage.
Using only unsigned integer 8 bit (uint8_t).
Implementing the LCD as points (x, y). So the game 20*2 means that the first row from point (0, 0) to (0, 19) and the second row from (1, 0) to (1, 19).
The code is well organized, divided into H files, commented.
Small memory use without using any extra memory.