This is a tutorial about how to connect Proteus with Arduino IDE by serial port. Take BCD Adder for an instance.

1. Install virtual serial port driver for creating virtual serial port pair.

2. Pick “COMPIM” component in Proteus and setup baud rate and port number, so does “VIRTUAL TERMINAL”.

3. Setup Serial Monitor in Arduino IDE.

Now run simulation in Proteus and input addend in Serial Monitor in Arduino IDE. The data will be transmitted and received by COM1/COM2.

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Demo codes:

/*  
    LAB2: Addends generator for FPGA BCD adder
    Programming & Hardware By Epiapoq
    Started 29-03-2021
    Modified 30-03-2021
    Version 1.0
    Reference:
    https://github.com/whatuptkhere/paralleloslam/blob/master/Paralleloslam.ino
*/

int firstByte = 0; // the first addend from serial port
int secondByte = 0; // the second addend from serial port
int sum = 0; // the sum
int cb = 0; // check bit, which is used to check the number of the incomming addend

/* each addend of BCD adder consists of only 4 bits, so here 
just define the lower nibble of the firstByte or secondByte */
const int firstByte_0 = 4; // LSB of first addend
const int firstByte_1 = 5;
const int firstByte_2 = 6;
const int firstByte_3 = 7; // MSB of first addend
const int secondByte_0 = 8; // LSB of second addend
const int secondByte_1 = 9;
const int secondByte_2 = 10;
const int secondByte_3 = 11; // MSB of second addend

void setup() {
    Serial.begin(9600); // open serial port, set data rate to 9600 bps
    pinMode(firstByte_0, OUTPUT);
    pinMode(firstByte_1, OUTPUT);
    pinMode(firstByte_2, OUTPUT);
    pinMode(firstByte_3, OUTPUT);
    pinMode(secondByte_0, OUTPUT);
    pinMode(secondByte_1, OUTPUT);
    pinMode(secondByte_2, OUTPUT);
    pinMode(secondByte_3, OUTPUT);
}

void loop() {
    if (Serial.available() > 0 && (cb == 0)) { // read the first addend
        firstByte = Serial.read() - 48;
        
        /* serial in from monitor and parallel out to FPGA */
        digitalWrite(firstByte_0, firstByte & 0x01); // send LSB of first addend
        digitalWrite(firstByte_1, firstByte & 0x02);
        digitalWrite(firstByte_2, firstByte & 0x04);
        digitalWrite(firstByte_3, firstByte & 0x08);
        
        Serial.print(firstByte);
        Serial.print('+');
        cb = 1;
    }
    else if ((Serial.available() > 0) && (cb == 1)) { // read the second addend
        secondByte = Serial.read() - 48;

        /* serial in from monitor and parallel out to FPGA */
        digitalWrite(secondByte_0, secondByte & 0x01);
        digitalWrite(secondByte_1, secondByte & 0x02);
        digitalWrite(secondByte_2, secondByte & 0x04);
        digitalWrite(secondByte_3, secondByte & 0x08);
        
        Serial.print(secondByte);
        Serial.print('=');
        sum = firstByte + secondByte;
        Serial.print(sum); 
        Serial.println('\n');
        cb = 0;
    }
}