import RPi.GPIO as GPIO
from lib_nrf24 import NRF24
import spidev
import pygame
import time
import array

# Define some colors
BLACK    = (   0,   0,   0)
WHITE    = ( 255, 255, 255)

# This is a simple class that will help us print to the screen
# It has nothing to do with the joysticks, just outputting the
# information.
class TextPrint:
    def __init__(self):
        self.reset()
        self.font = pygame.font.Font(None, 20)

    def Print(self, screen, textString):
        textBitmap = self.font.render(textString, True, BLACK)
        screen.blit(textBitmap, [self.x, self.y])
        self.y += self.line_height

    def reset(self):
        self.x = 10
        self.y = 10
        self.line_height = 15

    def indent(self):
        self.x += 10

    def unindent(self):
        self.x -= 10


pygame.init()

# Initialize the GPIO interface
GPIO.setmode(GPIO.BCM)

# Set the width and height of the screen [width,height]
size = [500, 500]
screen = pygame.display.set_mode(size)

pygame.display.set_caption("joystick test app")

#Loop until the user clicks the close button.
done = False

# Used to manage how fast the screen updates
clock = pygame.time.Clock()

# Initialize the joysticks
pygame.joystick.init()

# Get ready to print
textPrint = TextPrint()

# Make an ouput array
output = list("test")

# Start the radio
pipes = [[0xE8, 0xE8, 0xF0, 0xF0, 0xE1], [0xF0, 0xF0, 0xF0, 0xF0, 0xE1]]

radio = NRF24(GPIO, spidev.SpiDev())
radio.begin(0, 17)

radio.setPayloadSize(32)
radio.setChannel(0x76)
radio.setDataRate(NRF24.BR_250KBPS)
radio.setPALevel(NRF24.PA_MAX)

radio.setAutoAck(True)
radio.enableDynamicPayloads()
radio.enableAckPayload()

radio.openWritingPipe(pipes[0])
radio.openReadingPipe(1, pipes[1])
radio.printDetails()

# -------- Main Program Loop -----------
while done==False:
    # create array for output
    # EVENT PROCESSING STEP
    for event in pygame.event.get(): # User did something
        if event.type == pygame.QUIT: # If user clicked close
            done=True # Flag that we are done so we exit this loop

        # Possible joystick actions: JOYAXISMOTION JOYBALLMOTION JOYBUTTONDOWN JOYBUTTONUP JOYHATMOTION
        if event.type == pygame.JOYBUTTONDOWN:
            print("Joystick button pressed.")
        if event.type == pygame.JOYBUTTONUP:
            print("Joystick button released.")


    # DRAWING STEP
    # First, clear the screen to white. Don't put other drawing commands
    # above this, or they will be erased with this command.
    screen.fill(WHITE)
    textPrint.reset()

    # Get count of joysticks
    joystick_count = pygame.joystick.get_count()

    textPrint.Print(screen, "Number of joysticks: {}".format(joystick_count) )
    textPrint.indent()

    # For each joystick:
    for i in range(joystick_count):
        joystick = pygame.joystick.Joystick(i)
        joystick.init()

        textPrint.Print(screen, "Joystick {}".format(i) )
        textPrint.indent()

        # Get the name from the OS for the controller/joystick
        name = joystick.get_name()
        textPrint.Print(screen, "Joystick name: {}".format(name) )

        # Usually axis run in pairs, up/down for one, and left/right for
        # the other.
        axes = joystick.get_numaxes()
        textPrint.Print(screen, "Number of axes: {}".format(axes) )
        textPrint.indent()
        axisvals = []

        for i in range( axes ):
            axis = joystick.get_axis( i )
            textPrint.Print(screen, "Axis {} value: {:>6.3f}".format(i, axis) )
            axis = (axis+1)/2
            axis = int(axis * 179)
            axisvals.append(axis)
            output.append(chr(axis))

        textPrint.unindent()

        buttons = joystick.get_numbuttons()
        textPrint.Print(screen, "Number of buttons: {}".format(buttons) )
        textPrint.indent()
        buttonvals = []

        for i in range( buttons ):
            button = joystick.get_button( i )
            textPrint.Print(screen, "Button {:>2} value: {}".format(i,button) )
            buttonvals.append(button)
            # output.append(chr(button)) for now, im only sending the axis data

        textPrint.unindent()

        # Hat switch. All or nothing for direction, not like joysticks.
        # Value comes back in an array.
        hats = joystick.get_numhats()
        textPrint.Print(screen, "Number of hats: {}".format(hats) )
        textPrint.indent()
        hatvals = []

        for i in range( hats ):
            hat = joystick.get_hat( i )
            textPrint.Print(screen, "Hat {} value: {}".format(i, str(hat)) )
            hat = str(hat)
            x,y=hat.split(",")  #hats is given as a strign (x, y) so we split it
            if x.find("0")>=0:  # only possible values are 1, 0, -1, so we search both halves
                hatvals.append(int(0))
            elif x.find("-")>=0:
                hatvals.append(int(-1))
            else:
                hatvals.append(int(1))
            if y.find("0")>=0:
                hatvals.append(int(0))
            elif y.find("-")>=0:
                hatvals.append(int(-1))
            else:
                hatvals.append(int(1))
        textPrint.unindent()

        radio.flush_tx()
        while (len(output) < 32):
            output.append(0)
        radio.write(output)
        time.sleep(.005)
    # ALL CODE TO DRAW SHOULD GO ABOVE THIS COMMENT

    # Go ahead and update the screen with what we've drawn.
    pygame.display.flip()

    # Limit to 20 frames per second
    clock.tick(20)

# Close the window and quit.
# If you forget this line, the program will 'hang'
# on exit if running from IDLE.
pygame.quit ()

#include<SPI.h>
#include<RF24.h>


// CE, CSN pins
RF24 radio(9, 10);

void setup(void){
  while(!Serial);
  Serial.begin(9600);

  radio.begin();
  radio.setPALevel(RF24_PA_MAX);
  radio.setChannel(0x76);
  radio.openWritingPipe(0xF0F0F0F0E1LL);
  const uint64_t pipe = (0xE8E8F0F0E1LL);
  radio.openReadingPipe(1, pipe);

  radio.enableDynamicPayloads();
  radio.powerUp();

}

void loop(void){
  radio.startListening();
  Serial.println("Starting loop. Radio on.");
  char receivedMessage[32] = {0};
  if(radio.available()){
    radio.read(receivedMessage, sizeof(receivedMessage));
    Serial.println(receivedMessage);
  } else {
    Serial.println("No data!");
  }
  delay(100);

}

Traceback (most recent call last):


File "joystick_test.py", line 180, in <module>
    radio.write(output)
  File "/home/pi/Desktop/NRF24L01/lib_nrf24.py", line 452, in write
    self.startWrite(buf)
  File "/home/pi/Desktop/NRF24L01/lib_nrf24.py", line 485, in startWrite
    self.write_payload(buf)
  File "/home/pi/Desktop/NRF24L01/lib_nrf24.py", line 268, in write_payload
    return self.spidev.xfer2(txbuffer)
OverflowError: Argument list size exceeds 4096 bytes.