PIC - Seven Segment Display Counter

Brief Descrption

A project for learning purposes in C programming language for PIC18F that explores the following features: interrupts, timing, input and output ports (I/O), and peripherals (buttons, LEDs and 7-segment displays).

Project Requirements

The project should be implemented in C programming language and should perform as follows:

• When a button connected to port RB0 is pressed, a seven segment display connected to Port D must count (from 0 to 9 in a loop) with a period of 1s.
• When a second button, connected to port RB1, is pressed, the same seven segment display must count (from 0 to 9 in a loop) with a period of 0.25s.
• The seven segment display starts off and the count only starts when any of the buttons are pressed.
• Use the timer TMR0 with External Interruption (on the buttons) to generate the time bases of the count and cause its changes. It is important to highlight that the buttons (keys) considered now are those of the momentary type, that is, you must press and release immediately afterwards because what counts for triggering the interrupt is the edge change.
• The clock frequency of the PIC must be 8 MHz (HS external crystal).

Guide throught the project

Project organization

The project is organized as follows:

PIC_SevenSegDisplayCounter
├── flake.lock          # Specifies program versions
├── flake.nix           # Main Nix project file
├── LICENSE
├── Makefile            # Project's Makefile
├── README.md
├── shell.nix           # Describes the development enviroment used
├── simu
│   ├── circuit.hex     # Pre-compiled Hex file for the simulation
│   └── circuit.simu    # Simulation File for SimulIDE
└── src
    └── main.c          # Actual Source Code

Set everything up

This project uses Nix as a package manager This is needed even if you want to just test the project. Ensure you have nix installed on your linux distribuition.

nix --experimental-features 'nix-command flakes'

Just test the project with Flakes without having to Clone the Repo

nix run github:CarlosCraveiro/PIC_SevenSegDisplayCounter

Complile the source

Next steps will only work if you have clonned this repo.

cd PIC_SevenSegDisplayCounter/
nix develop .

and

make all

or

nix build .

Run Simulation

Next steps will only work if you have clonned this repo.

simulide simu/circuit.simu

Ensures that your hex file is the one you compiled it. Or...

nix run .

If everything works as expected you should see this schematics:

Documentation and Further Explanations

Additional explanations can be found at the Project's Wiki

Bill Of Materials

This BOM refers to the components used on the SimulIDE simulation simu/circuit.simu

• Push-24 : Push Button
• Push-25 : Push Button
• Resistor-33 : Resistor 1 kΩ
• Resistor-34 : Resistor 1 kΩ
• ResistorDip-2 : ResistorDip 150 Ω
• Seven Segment-13 : Seven Segment Display Common Cathode
• pic18f4550-1 : pic18f4550 microcontroler

Authors

• Carlos Henrique Craveiro Aquino Veras - 12547187 - @CarlosCraveiro
• Gabriel Franceschi Libardi - 11760739 - @gabriel-libardi