This is arduino code for Adafruit Bluefruit for playing Euro Truck Simulator 2

ETS2.ino

/*********************************************************************
 This is an example for our nRF51822 based Bluefruit LE modules

 Pick one up today in the adafruit shop!

 Adafruit invests time and resources providing this open source code,
 please support Adafruit and open-source hardware by purchasing
 products from Adafruit!

 MIT license, check LICENSE for more information
 All text above, and the splash screen below must be included in
 any redistribution
*********************************************************************/

/*
  This example shows how to send HID (keyboard/mouse/etc) data via BLE
  Note that not all devices support BLE Mouse!
  - OSX, Windows 10 both work
  - Android has limited support
  - iOS completely ignores mouse
*/

#include <Arduino.h>
#include <SPI.h>
#if not defined (_VARIANT_ARDUINO_DUE_X_) && not defined(ARDUINO_ARCH_SAMD)
  #include <SoftwareSerial.h>
#endif
#include <DigitalIO.h>
const uint8_t SOFT_SPI_MISO_PIN =0;
const uint8_t SOFT_SPI_MOSI_PIN = 1;
const uint8_t SOFT_SPI_SCK_PIN  = 6;
const uint8_t SPI_MODE = 3;

byte buttonStateA0 = HIGH;
byte lastbuttonStateA0 = HIGH;
byte buttonStateA1 = HIGH;
byte lastbuttonStateA1 = HIGH;
byte buttonStateA2 = HIGH;
byte lastbuttonStateA2 = HIGH;
byte buttonStateA3 = HIGH;
byte lastbuttonStateA3 = HIGH;
byte buttonStateA4 = HIGH;
byte lastbuttonStateA4 = HIGH;
byte buttonStateA5 = HIGH;
byte lastbuttonStateA5 = HIGH;
byte buttonState10 = HIGH;
byte lastbuttonState10 = HIGH;
byte buttonState11 = HIGH;
byte lastbuttonState11 = HIGH;
byte buttonState12 = HIGH;
byte lastbuttonState12 = HIGH;
byte buttonState13 = HIGH;
byte lastbuttonState13 = HIGH;

SoftSPI<SOFT_SPI_MISO_PIN, SOFT_SPI_MOSI_PIN, SOFT_SPI_SCK_PIN, SPI_MODE> softspi;
#include "Adafruit_BLE.h"
#include "Adafruit_BluefruitLE_SPI.h"
#include "Adafruit_BluefruitLE_UART.h"

#include "BluefruitConfig.h"

/*=========================================================================
    APPLICATION SETTINGS

    FACTORYRESET_ENABLE       Perform a factory reset when running this sketch
   
                              Enabling this will put your Bluefruit LE module
                              in a 'known good' state and clear any config
                              data set in previous sketches or projects, so
                              running this at least once is a good idea.
   
                              When deploying your project, however, you will
                              want to disable factory reset by setting this
                              value to 0.  If you are making changes to your
                              Bluefruit LE device via AT commands, and those
                              changes aren't persisting across resets, this
                              is the reason why.  Factory reset will erase
                              the non-volatile memory where config data is
                              stored, setting it back to factory default
                              values.
       
                              Some sketches that require you to bond to a
                              central device (HID mouse, keyboard, etc.)
                              won't work at all with this feature enabled
                              since the factory reset will clear all of the
                              bonding data stored on the chip, meaning the
                              central device won't be able to reconnect.
    MINIMUM_FIRMWARE_VERSION  Minimum firmware version to have some new features
    -----------------------------------------------------------------------*/
    #define FACTORYRESET_ENABLE         0
    #define MINIMUM_FIRMWARE_VERSION    "0.6.6"
/*=========================================================================*/


// Create the bluefruit object, either software serial...uncomment these lines
/*
SoftwareSerial bluefruitSS = SoftwareSerial(BLUEFRUIT_SWUART_TXD_PIN, BLUEFRUIT_SWUART_RXD_PIN);

Adafruit_BluefruitLE_UART ble(bluefruitSS, BLUEFRUIT_UART_MODE_PIN,
                      BLUEFRUIT_UART_CTS_PIN, BLUEFRUIT_UART_RTS_PIN);
*/

/* ...or hardware serial, which does not need the RTS/CTS pins. Uncomment this line */
// Adafruit_BluefruitLE_UART ble(BLUEFRUIT_HWSERIAL_NAME, BLUEFRUIT_UART_MODE_PIN);

/* ...hardware SPI, using SCK/MOSI/MISO hardware SPI pins and then user selected CS/IRQ/RST */
Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_CS, BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);

/* ...software SPI, using SCK/MOSI/MISO user-defined SPI pins and then user selected CS/IRQ/RST */
//Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_SCK, BLUEFRUIT_SPI_MISO,
//                             BLUEFRUIT_SPI_MOSI, BLUEFRUIT_SPI_CS,
//                             BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);

// A small helper
void error(const __FlashStringHelper*err) {
  Serial.println(err);
  while (1);
}

// setup pins 
int nReset = 2; 
int nCS = 3; 


/**************************************************************************/
/*!
    @brief  Sets up the HW an the BLE module (this function is called
            automatically on startup)
*/
/**************************************************************************/
void setup(void)
{
  //while (!Serial);  // required for Flora & Micro
  delay(500);

      //set pin I/O direction 
  pinMode (nReset, OUTPUT); 
  pinMode (nCS, OUTPUT); 
  pinMode (A0, INPUT); 
  pinMode (A1, INPUT);
  pinMode (A2, INPUT); 
  pinMode (A3, INPUT);
  pinMode (A4, INPUT); 
  pinMode (A5, INPUT);  
  pinMode (10, INPUT); 
  pinMode (11, INPUT);
  pinMode (12, INPUT); 
  pinMode (13, INPUT); 
  pinMode (A0, INPUT_PULLUP); 
  pinMode (A1, INPUT_PULLUP);
  pinMode (A2, INPUT_PULLUP); 
  pinMode (A3, INPUT_PULLUP);
  pinMode (A4, INPUT_PULLUP); 
  pinMode (A5, INPUT_PULLUP);
  pinMode (10, INPUT_PULLUP); 
  pinMode (11, INPUT_PULLUP);
  pinMode (12, INPUT_PULLUP); 
  pinMode (13, INPUT_PULLUP);
    //put the device in reset not chip selected 
  digitalWrite(nReset,LOW); 
  digitalWrite(nCS,HIGH); 

  Serial.begin(115200);
  Serial.println(F("Adafruit Bluefruit HID Mouse Example"));
  Serial.println(F("---------------------------------------"));

  /* Initialise the module */
  Serial.print(F("Initialising the Bluefruit LE module: "));

  if ( !ble.begin(VERBOSE_MODE) )
  {
    error(F("Couldn't find Bluefruit, make sure it's in CoMmanD mode & check wiring?"));
  }
  Serial.println( F("OK!") );

  if ( FACTORYRESET_ENABLE )
  {
    /* Perform a factory reset to make sure everything is in a known state */
    Serial.println(F("Performing a factory reset: "));
    if ( ! ble.factoryReset() ){
      error(F("Couldn't factory reset"));
    }
  }

  /* Disable command echo from Bluefruit */
  ble.echo(false);

  Serial.println("Requesting Bluefruit info:");
  /* Print Bluefruit information */
  ble.info();

  // This demo only available for firmware from 0.6.6
  if ( !ble.isVersionAtLeast(MINIMUM_FIRMWARE_VERSION) )
  {
    error(F("This sketch requires firmware version " MINIMUM_FIRMWARE_VERSION " or higher!"));
  }

  /* Enable HID Service (including Mouse) */
  Serial.println(F("Enable HID Service (including Mouse): "));
  if (! ble.sendCommandCheckOK(F( "AT+BleHIDEn=On"  ))) {
    error(F("Failed to enable HID (firmware >=0.6.6?)"));
  }

  /* Add or remove service requires a reset */
  Serial.println(F("Performing a SW reset (service changes require a reset): "));
  if (! ble.reset() ) {
    error(F("Could not reset??"));
  }

  Serial.println();

    //initialize SPI 
  softspi.begin(); 
  //SPI.setDataMode(SPI_MODE3);
}

/**************************************************************************/
/*!
    @brief  Constantly poll for new command or response data
*/
/**************************************************************************/
void loop(void)
{
  //throttle
  buttonStateA0 = digitalRead(A0);
if ((buttonStateA0==LOW)&&(buttonStateA0!=lastbuttonStateA0)){
  ble.println(F("AT+BleHidMouseButton=L,press"));
  lastbuttonStateA0=buttonStateA0;
  }
if ((buttonStateA0==HIGH)&&(buttonStateA0!=lastbuttonStateA0)){
  ble.println(F("AT+BleHidMouseButton=0"));
  lastbuttonStateA0=buttonStateA0;
  }
  //horn
      buttonStateA1 = digitalRead(A1);
if ((buttonStateA1==LOW)&&(buttonStateA1!=lastbuttonStateA1)){
  ble.println(F("AT+BleHidMouseButton=R,press"));
  lastbuttonStateA1=buttonStateA1;
  }
if ((buttonStateA1==HIGH)&&(buttonStateA1!=lastbuttonStateA1)){
  ble.println(F("AT+BleHidMouseButton=0"));
  lastbuttonStateA1=buttonStateA1;
  }
  //engine 
  buttonStateA2 = digitalRead(A2);
if ((buttonStateA2==LOW)&&(buttonStateA2!=lastbuttonStateA2)){
  ble.println("AT+BleKeyboard=E");
  lastbuttonStateA2=buttonStateA2;
  }
if ((buttonStateA2==HIGH)&&(buttonStateA2!=lastbuttonStateA2)){
   ble.println("AT+BleKeyboard=E");
  lastbuttonStateA2=buttonStateA2;
  }
  //right signal
      buttonStateA3 = digitalRead(A3);
if ((buttonStateA3==LOW)&&(buttonStateA3!=lastbuttonStateA3)){
  ble.println("AT+BleKeyboard=[");
  lastbuttonStateA3=buttonStateA3;
  }
if ((buttonStateA3==HIGH)&&(buttonStateA3!=lastbuttonStateA3)){
  ble.println("AT+BleKeyboard=[");
  lastbuttonStateA3=buttonStateA3;
  }
  //left signal
  buttonStateA4 = digitalRead(A4);
if ((buttonStateA4==LOW)&&(buttonStateA4!=lastbuttonStateA4)){
  ble.println("AT+BleKeyboard=]");
  lastbuttonStateA4=buttonStateA4;
  }
if ((buttonStateA4==HIGH)&&(buttonStateA4!=lastbuttonStateA4)){
  ble.println("AT+BleKeyboard=]");
  lastbuttonStateA4=buttonStateA4;
  }
  //parking brake
      buttonStateA5 = digitalRead(A5);
if ((buttonStateA5==LOW)&&(buttonStateA5!=lastbuttonStateA5)){
  ble.println("AT+BleKeyboard=S");
  lastbuttonStateA5=buttonStateA5;
  }
if ((buttonStateA5==HIGH)&&(buttonStateA5!=lastbuttonStateA5)){
  ble.println("AT+BleKeyboard=S");
  lastbuttonStateA5=buttonStateA5;
  }
  //Light
    buttonState10 = digitalRead(10);
if ((buttonState10==LOW)&&(buttonState10!=lastbuttonState10)){
  ble.println("AT+BleKeyboard=L");
  lastbuttonState10=buttonState10;
  }
if ((buttonState10==HIGH)&&(buttonState10!=lastbuttonState10)){
  
  lastbuttonState10=buttonState10;
  }
  //Hazard
        buttonState11 = digitalRead(11);
if ((buttonState11==LOW)&&(buttonState11!=lastbuttonState11)){
  ble.println("AT+BleKeyboard=F");
  lastbuttonState11=buttonState11;
  }
if ((buttonState11==HIGH)&&(buttonState11!=lastbuttonState11)){
 // ble.println("AT+BleKeyboard=F");
  lastbuttonState11=buttonState11;
  }
  //brake
  buttonState12 = digitalRead(12);
if ((buttonState12==LOW)&&(buttonState12!=lastbuttonState12)){
  ble.println(F("AT+BleHidMouseButton=M,press"));
  
  lastbuttonState12=buttonState12;
  }
if ((buttonState12==HIGH)&&(buttonState12!=lastbuttonState12)){
  ble.println(F("AT+BleHidMouseButton=0"));
  lastbuttonState12=buttonState12;
  }
  //Wiper
      buttonState13 = digitalRead(13);
if ((buttonState13==LOW)&&(buttonState13!=lastbuttonState13)){ 
   ble.println("AT+BleKeyboard=P");
  lastbuttonState13=buttonState13;
  }
if ((buttonState13==HIGH)&&(buttonState13!=lastbuttonState13)){ 
  lastbuttonState13=buttonState13;
  }
  
// Serial.println(buttonStateA0);
    //enable ADNS 
  digitalWrite(nReset,HIGH); 
    // delay a bit
    delay(100);
    unsigned int motion = 0; 
    //check for movement 
    //read motion register, 0x02 
    motion = ADNS_read(0x02); 
    if(motion > 127){ 
      Serial.println( motion);
      //there has been a motion! 
    ble.print(F("AT+BleHidMouseMove="));
   ble.print(int((convTwosComp(ADNS_read(0x03)))/3));
    ble.print(",");
    ble.println(convTwosComp(ADNS_read(0x04))*0);
    }

}

unsigned int ADNS_read(unsigned int address){ 
  unsigned int data; 
  // take the CS pin low to select the chip: 
  digitalWrite(nCS,LOW); 
  //  send in the address and value via SPI: 
  softspi.transfer(address); 

  pinMode(MOSI, INPUT); 
  data = softspi.transfer(0x00); 
  pinMode(MOSI, OUTPUT); 
  // take the SS pin high to de-select the chip: 
  digitalWrite(nCS,HIGH);  
  return(data); 
} 

int convTwosComp(int b){ //Convert from 2's complement
   if(b & 0x80){
     b = -1 * ((b ^ 0xff) + 1);
     }
   return b;
   }