Overview

This project aims to design and implement a 2-bit comparator using the VSDSquadron Mini board. A 2-bit comparator is a digital circuit that compares two 2-bit binary numbers and indicates whether one number is greater than, less than, or equal to the other. The project involves designing the comparator logic using C programming in Visual Studio Code, setting up the hardware connections on a breadboard, and verifying the functionality through LEDs connected to the output.

Project Objective

The objective of this project is to:

1. Design a 2-bit comparator using C programming.
2. Implement the designed comparator on the VSDSquadron Mini board.
3. Verify the correct functionality of the comparator by using LEDs to display the comparison results.
4. Gain hands-on experience in digital circuit design, C programming, and hardware implementation.

Key Components

1. VSDSquadron Mini Board : The main microcontroller board used for processing and logic implementation.
2. Breadboard and Jumper Wires : For building and testing the circuit.
3. LEDs : To display the comparison results.This project requires 3 LEDs.
4. Resistors : To limit the current to the LEDs.220Ohm resistors are used in this project.

Pin Configuration

LED	VSD SQUADRON BOARD
LED1	PIN4 (PD4)
LED2	PIN5 (PD5)
LED3	PIN6 (PD6)

Circuit Diagram

Functional Description

• A > B: LED1 (Yellow color) lights up when a is greater than b.
• A < B: LED2 (Red color) lights up when a is less than b.
• A = B: LED3 (Green color) lights up when both numbers are equal.

Truth Table of 2-bit comparator

A1	A0	B1	B0	A>B	A=B	A<B
0	0	0	0	0	1	0
0	0	0	1	0	0	1
0	0	1	0	0	0	1
0	0	1	1	0	0	1
0	1	0	0	1	0	0
0	1	0	1	0	1	0
0	1	1	0	0	0	1
0	1	1	1	0	0	1
1	0	0	0	1	0	0
1	0	0	1	1	0	0
1	0	1	0	0	1	0
1	0	1	1	0	0	1
1	1	0	0	1	0	0
1	1	0	1	1	0	0
1	1	1	0	1	0	0
1	1	1	1	0	1	0

Code for implementation of 2-bit comparator using VSDSquadron Mini Board(.C Code)

#include <ch32v00x.h>
#include <debug.h>
#include<stdio.h>

#define LED1_PIN GPIO_Pin_4 //yellow LED
#define LED2_PIN GPIO_Pin_5 //red LED
#define LED3_PIN GPIO_Pin_6 //green LED
#define LED_PORT GPIOD

void GPIO_Config(void) {
    // Enable the clock for GPIOD

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);

    // Configure PD4, PD5, and PD6 as outputs
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = LED1_PIN | LED2_PIN | LED3_PIN ;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // Push-pull output
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void compare_2bit(uint8_t a, uint8_t b) {
    // Clear all LEDs
    GPIO_ResetBits(LED_PORT, LED1_PIN | LED2_PIN | LED3_PIN);

    if (a > b) {
      // Light up LED1 if a > b
        GPIO_SetBits(LED_PORT, LED1_PIN);
    } else if (a == b) {
        // Light up LED2 if a == b
        GPIO_SetBits(LED_PORT, LED2_PIN);
    } else {
        // Light up LED3 if a < b
        GPIO_SetBits(LED_PORT, LED3_PIN);
    }  
    
}  

int main(void) {   
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();
    Delay_Init();
    // Initialize the GPIO for the LEDs
    GPIO_Config();


    // Main loop to iterate over all possible 2-bit numbers  
     for (uint8_t a = 0; a <= 3; a++) {
        for (uint8_t b = 0; b <= 3; b++) {
            compare_2bit(a, b);
            Delay_Ms(5000); // Delay for visualization
        }
    }
    
    return 0;
}

Project Demonstration

Conclusion

This implementation demonstrates the use of the VSDSquadron Mini board to design a basic digital circuit. The 2-bit comparator effectively compares two binary numbers and outputs the comparison results through LEDs. This project reinforces the fundamental concepts of digital design.Overall, this project was a valuable learning experience.