nRF24L01's Doesn't Interact Until I Give Them a Command!

Projects Networking, Protocols, and Devices
1

Ok, here's the deal: When I connect the nRF24L01's they don't communicate. I get "No Radio" on serial Port.
But when I give a command, in this case when I Pull joystick UP, they communicate and get the command. Here is the question: How can I keep them in touch all the time they are active?
I'm using Arduino Uno as Transmitter with Funduino Joystick Shield, Arduino Due as Receiver. And I'm using RF24 Library v1.1.5
The Transmitter Code:

#include <JoystickShield.h> 
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#define CE_PIN 9
#define CSN_PIN 10

JoystickShield joystickShield; 
const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(CE_PIN, CSN_PIN);
byte movement;
String movementt;
void setup() {
    radio.begin();
    radio.openWritingPipe(pipe);
    radio.stopListening();    
    Serial.begin(9600);  
    delay(100);        
    joystickShield.calibrateJoystick(); 
    
}

void loop() {
  radio.startListening();
  radio.available();
  joystickShield.processEvents(); 
  if (joystickShield.isUp()) {
    radio.stopListening();        
    movement = 'U';
    radio.write(&movement,1);
    Serial.println(movement);
    Serial.println(sizeof(movement));
}
  if (joystickShield.isRightUp()) {
    radio.stopListening();  
    movement = 'S';
  }
  if (joystickShield.isRight()) {
    radio.stopListening();  
    movement = 'R';
  }
  if (joystickShield.isRightDown()) {
    radio.stopListening();  
    movement = 'S';
  }
  if (joystickShield.isDown()) {
    radio.stopListening();  
    movement = 'D';
  }
  if (joystickShield.isLeftDown()) {
    radio.stopListening();  
    movement = 'S';
  }
  if (joystickShield.isLeft()) {
    radio.stopListening();  
    movement = 'L';
  }
  if (joystickShield.isLeftUp()) {
    radio.stopListening();  
    movement = 'S';
  }
  if (joystickShield.isJoystickButton()) {
    radio.stopListening();  
    movement = 'J';
  }
  if (joystickShield.isUpButton()) {
    radio.stopListening();  
    movement = 0;
    radio.write(&movement,1);
  }
  if (joystickShield.isRightButton()) {
    radio.stopListening();  
    movement = 'B';
  }
  if (joystickShield.isDownButton()) {
    radio.stopListening();  
    movement = 'C';
  }
  if (joystickShield.isLeftButton()) {
    radio.stopListening();  
    movement = 'D';
  }
  if (joystickShield.isEButton()) {
    radio.stopListening();  
    movement = 'E';
  }
  if (joystickShield.isFButton()) {
    radio.stopListening();  
    movement = 'F';
  }    
  if (joystickShield.isNotCenter()){
    radio.stopListening();  
    movement = 'N';
  }  
  Serial.print("x "); 
  Serial.print(joystickShield.xAmplitude());
  Serial.print(" y ");
  Serial.println(joystickShield.yAmplitude());
  radio.startListening();  
  delay(500);
}

The Receiver Code:

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#define CE_PIN 7
#define CSN_PIN 8
#include <printf.h>

const uint64_t pipe = 0xE8E8F0F0E1LL;
RF24 radio(CE_PIN, CSN_PIN);
byte movement = 3;
String movementt;
void setup() {
  radio.begin();
  radio.openReadingPipe(1, pipe);
  pinMode(13, OUTPUT);

  Serial.begin(9600);
  delay(100);
}

void loop() {
  digitalWrite(13, LOW);
  radio.startListening();
  while (radio.available()) {
  //Serial.println("While.");
  radio.read(&movement, 1);  
  if(char(movement)== 'U'){digitalWrite(13,HIGH);}
  Serial.println(char(movement));
  }Serial.println("No radio.");
  }
2

mamican96:
When I connect the nRF24L01's they don't communicate.

You do not connect nRF24L01+s, this is not Bluetooth.

You will only receive something if you send something.

 radio.stopListening();

in setup superfluous, immediately undone by loop.

 radio.available();

useless rubbish.

You only send the 'U' command none of the others.
There are tons of useless radio.stopListening(); scattered through the code.

void loop() {
  digitalWrite(13, LOW);
  radio.startListening();
  while (radio.available()) {
    //Serial.println("While.");
    radio.read(&movement, 1);
    if (char(movement) == 'U') {
      digitalWrite(13, HIGH);
    }
    Serial.println(char(movement));
  }
  Serial.println("No radio.");
}

No wonder that it always prints "No radio.".

3

The call to radio.available() tells you whether data has been received. If you don't send data then nothing will be received.

It seems to me the system is working perfectly.

...R