Basic Calculator

Table of Contents

• Project Overview
• System Design
• Components and Implementation
• Board Interface
• Contributing
• License
• Maintainers

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Project Overview

The Basic Calculator is a project created for use on the Terasic DE-10 Standard board. It utilizes an ALU circuit to perform common mathematical operations (addition, subtraction, multiplication, and division). The result is displayed in both binary and integer formats.

Demo video

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System Design

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Components and Implementation

• ALU Circuit

  • Implements logic for an adder, subtractor, multiplier, or divider.
  • The operation is selected using a two-bit operator.
  • Accepts two 10-bit inputs for the calculation.
  • Utilizes synchronous flip-flop like logic for results handling.
  • Uses behavioral modeling.
  • Represents a multiplexer.

• Input Controller

  • Implements logic to store operands A and B, and the operator code.
  • A state machine is utilized to advance between storing a specific input.
  • Can reset all the inputs.
  • Utilizes synchronous flip-flop like logic.
  • Uses behavioral modeling.

• BCD-to-7-Segment Display Decoder

  • Converts a BCD digit into signals for a 7-segment display.
  • Determines which segments to activate based on the input digit.
  • Displays signs for unique numbers like fractions and negative numbers.
  • Uses hybrid modeling (both behavioral and dataflow).

• Top Calculator Entity

  • Establishes ports that will be assigned pins for circuit functionality.
  • Creates 1 ALU, 1 input controller, and 6 BCD-to-7-Segment Display Decoders (for display of each digit or sign).
  • Holds logic necessary for the circuits to work together (converting inputs and ouputs).
  • Contains error handling for division by zero, overflow, and unexpected errors.
  • Uses structural modeling.

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Board Interface

• Inputs

  • 10 Switches:
    • All 10 switches for inputting any of the operands (A and B).
    • 2 switches (0-1) for selecting the two-bit operator.
  • 1 Clock:
    • Provides the clock signal for the synchronous ALU and input controller process.
  • 3 Key Buttons:
    • Key button 0: Used to load in the operand/operator code.
    • Key button 1: Used to reset the calculation (resets all operands, operator code, and results stored in registers).
    • Key button 2: Used to confirm the calculation for display.

• Outputs

  • 6 7-Segment Displays:
    • Display calculation results in the range of -999999 to 999999.
    • Displays special signs (negative, fraction).
  • 10 LED Lights:
    • Show the calculation results and error codes in binary form.
    • Handles values from 0 to 1023.

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Contributing

1. Fork the repository
2. Create a feature branch:

git checkout -b feature/new-tracker

3. Add tests for new functionality
4. Submit a pull request

Coding Standards

• Complete concise commenting
• 80%+ test coverage

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License

MIT License - See LICENSE

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Maintainers

• Alonso Vazquez Tena: Developer