Arduino and processing controlling servo - arduino

Question

I am trying to control a servo using processing.
Basically, what I want is to press a button on processing and make the servo go from 0 to 180 degrees and back every two seconds and if I press another button on processing I should be able to move the servo using a potentiometer, however I am not able to make it work properly.
For example, when I pressed the POT button, the servo goes to the desired position, however if I move the potentiometer, the servo doesn't move unless I click the pot button again.
This is the relevant code for Arduino:
void loop ()
{
if(Serial.available()){
val= Serial.read();
while(val == 1){
digitalWrite(ledCPM, HIGH);
digitalWrite(ledPot, LOW);
digitalWrite(ledFSR,LOW);
cpmMovement();
val = Serial.read();
}
while(val == 2){
digitalWrite(ledPot, HIGH);
digitalWrite(ledCPM, LOW);
digitalWrite(ledFSR,LOW);
potMovement();
val = Serial.read();
}
while(val == 3){
digitalWrite(ledPot, LOW);
digitalWrite(ledCPM, LOW);
digitalWrite(ledFSR,HIGH);
fsrMovement();
val = Serial.read();
}
}
}
void cpmMovement(){unsigned long currentMillis = millis();
if(currentMillis - previousMillis > interval){
previousMillis = currentMillis;
if(positionservo == 0){
positionservo = 179;
myservo1.write(positionservo);
}
else{
positionservo = 0;
myservo1.write(positionservo);
}
}
}
void potMovement(){
int analogValuePot = analogRead(Pot)/4;
Serial.print("Potentiometer reading= ");
Serial.println(analogValuePot); // This will print the raw force value
int valuePot = map(analogValuePot, 0, 255, 0, 179); // scale it to use it with the servo (value between 0 and 180)
myservo1.write(valuePot); // sets the servo position according to the scaled value
delay(10); // waits for the servo to get there
}
void fsrMovement(){
force = analogRead(FSR); // Reads the FSR
Serial.print("Force sensor reading = ");
Serial.println(force); // This will print the raw force value
int pos = map(force, 0, 1023, 0, 175); // Scales the force reading to degrees for servo control
Serial.print("servomotor degrees = ");
Serial.println(pos); // This will print the adjusted servo reading (an angle)
myservo1.write(pos); // Write the new angle to the servo
delay(150); // Delay 150 milliseconds before taking another reading
}
And here you can see the relevant processing code as everything else works ok
import processing.serial.*;
void mousePressed(){
println("Coordinates: " + mouseX + "," + mouseY);
if(pressedCPMButton && currentColorCPM==butColorCPM){ //Changing color CPM to pressed button color
currentColorCPM = butpreColorCPM;
currentColorPOT = butColorPOT;
currentColorFSR = butColorFSR;
myPort.write(1); //Send 1 to port
}else if(pressedCPMButton && currentColorCPM==butpreColorCPM){
currentColorCPM = butColorCPM;
currentColorPOT = butColorPOT;
currentColorFSR = butColorFSR;
}
if(pressedPOTButton && currentColorPOT==butColorPOT){
currentColorCPM = butColorCPM;
currentColorPOT = butpreColorPOT;
currentColorFSR = butColorFSR;
myPort.write(2); //Send 2 to port
}else if(pressedPOTButton && currentColorPOT==butpreColorPOT){
currentColorCPM = butColorCPM;
currentColorPOT = butColorPOT;
currentColorFSR = butColorFSR;
}
if(pressedFSRButton && currentColorFSR==butColorFSR){
currentColorCPM = butColorCPM;
currentColorPOT = butColorPOT;
currentColorFSR = butpreColorFSR;
myPort.write(3); //Send 3 to port
}else if(pressedFSRButton && currentColorFSR==butpreColorFSR){
currentColorCPM = butColorCPM;
currentColorPOT = butColorPOT;
currentColorFSR = butColorFSR;
}
}
boolean pressedButtonCPM(int x, int y, int width, int height) {
if (mouseX >= x && mouseX <= x+width &&
mouseY >= y && mouseY <= y+height) {
return true;
} else {
return false;
}
}
boolean pressedButtonPOT(int x, int y, int width, int height) {
if (mouseX >= x && mouseX <= x+width &&
mouseY >= y && mouseY <= y+height) {
return true;
} else {
return false;
}
}
boolean pressedButtonFSR(int x, int y, int width, int height) {
if (mouseX >= x && mouseX <= x+width &&
mouseY >= y && mouseY <= y+height) {
return true;
} else {
return false;
}
}