Incomplete sketch to control DC motor speed via H-Bridge and potentiometer

sketch_hbridge_starter.ino

// hacked from: https://lastminuteengineers.com/drv8833-arduino-tutorial/
// Define the control inputs

#define MOT_A1_PIN 6
#define MOT_A2_PIN 5

void setup(void)
{
  // Set all the motor control inputs to OUTPUT
  pinMode(MOT_A1_PIN, OUTPUT);
  pinMode(MOT_A2_PIN, OUTPUT);

  // Turn off motors - Initial state
  digitalWrite(MOT_A1_PIN, LOW);
  digitalWrite(MOT_A2_PIN, LOW);

  // Initialize the serial UART at 9600 baud
  Serial.begin(9600);
  
  // Just to know which program is running on my Arduino
  Serial.println(F("START " __FILE__ " from " __DATE__ "\r\n" ));
  Serial.println("Min:0,Max:1023"); //Initial min/max for the plot

}

void loop( ) 
{
  // ************************
  // **** YOUR CODE HERE ****
  // ************************
  // 
  // Instructions
  //
  // declare an int variable, say pwm_value to hold the calculated vale for speed (0-255)
  // declare another variable to hold the value you read from the pot via analogReda() - an int
  // Use map() to force the range of the analogRead variable into 0 to 255 for analogWrite()
  // call set_motor_pwm( ) to the calculated pwm value from map()
  
  delay(100) ;
}

/// Set the current on a motor channel using PWM and directional logic.
///
/// \param pwm    PWM duty cycle ranging from -255 full reverse to 255 full forward
/// \param IN1_PIN  pin number xIN1 for the given channel
/// \param IN2_PIN  pin number xIN2 for the given channel
void set_motor_pwm(int pwm, int IN1_PIN, int IN2_PIN)
{
  if (pwm < 0) {  // reverse speeds
    analogWrite(IN1_PIN, -pwm);
    digitalWrite(IN2_PIN, LOW);

  } else { // stop or forward
    digitalWrite(IN1_PIN, LOW);
    analogWrite(IN2_PIN, pwm);
  }
}