LibreMonitorRFduino.ino

//#include <RFduinoBLE.h>

///
///   LibreMonitor
/// 
///   Copyright (c) 2015 Uwe Petersen, all right reserved
///
///   Wiring connections:
///
///      BM019            RFduino/Simblee
///      DIN:  pin 2      IRQ:  GPIO pin 2
///      SS:   pin 3      SS:   GPIO pin 3
///      MISO: pin 4      MISO: GPIO pin 4
///      MOSI: pin 5      MOSI: GPIO pin 5
///      SCK:  pin 6      SCK:  GPIO pin 6
///      SS0:  pin 7      +3V-pin
///      GND:  pin 10     GND-pin
///
///      BM019            BM019
///      SS0:  pin 7       VDD:  pin 8 (Output 3,3V from BM019)
///      
///      BM019            Lipo Power source (I use a 100mAh lip which lasts a full day
///      VIN:  pin 9      "+" of lipo / lipo charger
///      GND:  pin 10     GND/"-" of lipo / lipo charger
///
///      You can place a switch between GND of lipo/lipo-charger and GND of the BM019 
///
///      SPI-WIRING
///      If wired as suggested above, then you have to change the Simblee SPI pins for SS, MOSI, MISO and SCK. 
///      This is done in the variant.h file. In my case this file is located (dependent on the Simblee/RFduino 
///      version) in
///
///         /Users/[my user name]/Library/Arduino15/packages/Simblee/hardware/Simblee/1.0.0/variants/Simblee or 
///         /Users/[my user name]/Library/Arduino15/packages/RFduino/hardware/RFduino/2.3.3/variants
///
///      In this file set the defines for the SPI pins as follows:
///
///         #define PIN_SPI_SS           (3u)
///         #define PIN_SPI_MOSI         (5u)
///         #define PIN_SPI_MISO         (4u)
///         #define PIN_SPI_SCK          (6u)
///
///
///   Acknowledgements:
///
///      RFduinoUBP
///
///         This code uses portions of RFduinoUB, which can be retrieved from 
///              https://github.com/cconway/RFduinoUBP under the following license:
///         The MIT License (MIT)
///         Copyright (c) 2015 cconway
///         Permission is hereby granted, free of charge, to any person obtaining a copy
///         of this software and associated documentation files (the "Software"), to deal
///         in the Software without restriction, including without limitation the rights
///         to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
///         copies of the Software, and to permit persons to whom the Software is
///         furnished to do so, subject to the following conditions:
///         The above copyright notice and this permission notice shall be included in all
///         copies or substantial portions of the Software.
///         THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
///         IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
///         FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
///         AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
///         LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
///         OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
///         SOFTWARE.
///
///      Solutions Cubed LLC  
///
///         The author is grateful to Solutions Cubed LLC, see http://www.solutions-cubed.com, 
///         for providing helpful code samples for their BM019 nfc module, portions of which are 
///         used within this code. 
///
///
///   Choose between Simblee or RFduino hardware
///
///   If you want to switch between RFduino and Simblee or vice versa, be aware of the following tasks:
///     1. Follow the instructions in the simblee quick start guide (https://www.simblee.com/Simblee_Quickstart_Guide_v1.1.0.pdf) 
///        or the RFduino dcoumentation (https://github.com/RFduino/RFduino/blob/master/README.md) on how to install the 
///        arduino libraries needed.
///     2. Set your additional board manager in the Arduino IDE preferences to either Simblee or RFduino. 
///        With the Arduino IDE open, click on Arduino > Preferences
///        a) For Simblee: Copy and Paste the following link into Additional Boards Manager 
///           URLs: https://www.simblee.com/package_simblee166_index.json then press “OK”
///        b) For RFduino: Add http://rfduino.com/package_rfduino166_index.json to Additional Board Manager URLs and save.
///     3. Go to Tools > Board: > Boards Manager... and install the corresponding board.
///     4. Go to Go to Tools > Board: and choose the Simblee or RFduino board.
///     5. In the arduino IDE goto sketch and incorporate the RFduinoBLE or the SimbleBLE library respectively
///     6. If you had to install the Simblee or RFduino package be sure to reconfigure the SPI wiring in the
///        variants.h file, as explained in the SPI-WIRING section in the above comments on wiring connections
///     7. Set the following #define to SIMBLEE for using a Simblee or comment it out to use a RFduino
///     8. Do the same in the libUPB.cpp in the corresponding library for this project.
///
//#define SIMBLEE   // IF a Simblee is used, you have to define SIMBLEE, otherwise it is assumed you use a RFduino.

// Include application, user and local libraries
#ifdef SIMBLEE
#include <SimbleeBLE.h>
#include <SimbleeForMobile.h>
#else
#include <RFduinoBLE.h>
#endif

#include <SPI.h>               // the sensor communicates using SPI, so include the library
// This code uses the SLIP protocol to transer the data via bluetooth, see https://github.com/cconway/RFduinoUBP
#include <constants.h>
#include <crc8.h>
#include <data_types.h>
#include <libUBP.h>
#include <SPIstuff.h>


// Define variables and constants

/* CR95HF Commands */
#define IDN               0x01  // identification number of CR95HF
#define SELECT_PROTOCOL   0x02  // select protocol
#define POLL              0x03  // poll
#define SENDRECEIVE       0x04  // send and receive data (most commonly used)
#define READ              0x05  // read values from registers internal to CR95HF
#define WRITE             0x06  // write values to registers internal to CR95HF
#define ECHO              0x55

// send receive commands for ISO/IEC 15693 protocol
#define INVENTORY               0x01  // receives information about tags in range
#define STAY_QUIET              0x02  // selected unit will not send back a response
#define READ_BLOCK              0x20  // read single block of memory from RF tag
#define WRITE_BLOCK             0x21  // write single block to memory of RF tag
#define LOCK_BLOCK              0x22  // permanently locks a block of memory on RF tag
#define READ_BLOCKS             0x23  // reads multiple blocks of memory from RF tag
#define WRITE_BLOCKS            0x24  // writes multiple blocks of memory to RF tag
#define SELECT                  0x25  // used to select a specific tag for communication via the uid
#define RESET_TO_READY          0x26  // resets RF tag to ready state
#define WRITE_AFI               0x27  // writes application family identifier to RF tag
#define LOCK_AFI                0x28  // permanently locks application family identifier
#define WRITE_DSFID             0x29  // writes data storage format identifier to RF tag
#define LOCK_DSFID              0x2A  // permanentlylocks data storage format identifier
#define GET_SYSTEM_INFORMATION  0x2B  // gets information from RF tag that includes memory
// block size in bytes and number of memory blocks
#define GET_BLOCKS_SECURITY_STATUS  0x2C

// Request flag with bits set these rules:
//     Bit  Flag name           Description
//      1   Sub-carrier flag    0 ... single sub-carrier used
//                              1 ... two sub-carriers used
//      2   Data rate flag      0 ... low data rate is used
//                              1 ... high data rate is used
//      3   Inventory flag      State determines how bits 5-8 are defined
//                              0 ... flag not set
//                              1 ... flag set
//      4   Protocol            0: no protocol extension
//          extension flag      1: protocol format is extended
//   If Inventory flag = 0 (not set):
//      5   Select flag         0: request shall be executed based on setting of the address flag
//                              1: request shall be executed only by devices in the selected state
//      6   Address flag        0: request is not addressed
//                              1: request is addressed, optional UID field is present
//      7   Option flag         Meaning is defined by the command description, if not used set to 0
//      8   reserved
//   If Inventory flag = 1 (set):
//      5   AFI flag            0: AFI field is not present
//                              1: AFI field is present
//      6   Number of           0: 16 slots
//          slots flag          1: 1 slot
//      7   Option flag         Meaning is defined by the command description, if not used set to 0
//      8   reserved
//
//  Helper bit field by to quickly calculate integers from hex and vice versa:
//      Bit no.:     8   7   6   5      4   3   2   1
//      value:     128  64  32  16      8   4   2   1
//      choose:      0   0   0   0      4   0   2   1   result is 0x03
//
// request flags byte, 0x26 means:
//   single sub carrier, high data rate, inventory flag set, no protocoll extentsion, AFI not present, one slot)


// Settings

#define DEBUG

const int SS_PIN = 3;   // Slave Select pin, changed to new value on 2016-03-21
const int IRQ_PIN = 2;  // IRQ/DIN pin used for wake-up pulse
byte RXBuffer[400];     // receive buffer
byte dataBuffer[400];   // buffer for Freestyle Libre byte data
byte NFCReady = 0;      // used to track NFC state
const int SPI_FREQUENCY = 2000; // max. for CR95HF is 2000 = 2 MHz
const uint64_t SLEEP_DURATION = 20000;  // Duration of Simblee ultra low power mode in ms
//const uint64_t SLEEP_DURATION = 120000;  // Duration of Simblee ultra low power mode in ms

// Code

void setupPins() {
  Serial.println("Setting Simblee pins ...");
  pinMode(IRQ_PIN, OUTPUT);
  pinMode(SS_PIN, OUTPUT);
  // Commented out by Uwi on 15.11.2015: was not needed obviously
  //    digitalWrite(SS_PIN, HIGH);
  Serial.println("... done setting Simblee pins.");
}

void setupSPI() {
  Serial.println("Setting up SPI ...");
  SPI.begin();
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  SPI.setFrequency(SPI_FREQUENCY);
  Serial.println("... done setting up SPI.");
}
// --------------------------

void setupBluetoothConnection() {
  Serial.println("Setup Bluetooth stack and start connection...");
#ifdef SIMBLEE
  SimbleeBLE.deviceName = "LibreCGM";
  SimbleeBLE.customUUID = "2220";
  SimbleeBLE.advertisementData = "data";
  SimbleeBLE.advertisementInterval = MILLISECONDS(500);  // Default was 300
  SimbleeBLE.txPowerLevel = 4;  // Possible values: -20, -16, -12, -8, -4, 0 or +4 (dbM)  // up to 20016-05-17 this was 0
  //    SimbleeBLE.txPowerLevel = -4;  // Possible values: -20, -16, -12, -8, -4, 0 or +4 (dbM)  // up to 20016-05-17 this was 0
  SimbleeBLE.begin();           // Start the BLE stack
#else
  RFduinoBLE.deviceName = "LibreCGM";
//  RFduinoBLE.customUUID = "2220";
  RFduinoBLE.advertisementData = "data";
  RFduinoBLE.advertisementInterval = MILLISECONDS(500);  // Default was 300
  RFduinoBLE.txPowerLevel = 4;  // Possible values: -20, -16, -12, -8, -4, 0 or +4 (dbM)  // up to 20016-05-17 this was 0
  //    SimbleeBLE.txPowerLevel = -4;  // Possible values: -20, -16, -12, -8, -4, 0 or +4 (dbM)  // up to 20016-05-17 this was 0
  RFduinoBLE.begin();           // Start the BLE stack
#endif
  Serial.println("... done seting up Bluetooth stack and starting connection.");
}

// Add setup code
void setup() {
  Serial.begin(9600);
  setupPins();  // set RFduino/Simblee pins
  setupSPI();

  Serial.println("Please provide power to the BM019 within the next 5 seconds ...");
  delay(5000);

  sendWakeupPulse(IRQ_PIN);  // wake up BM019 and set to SPI (since SS_0 is wired up to be HIGH)
  readWakeUPEventRegister(SS_PIN, RXBuffer);
  setupBluetoothConnection();
}



// SetProtocol_Command programs the CR95HF for ISO/IEC 15693 operation.
// If the correct response is received the serial monitor is used to display successful programming.
// Warning: if the parameters of the protocol are changed, e.g. sub carrier, then the request flags
// of the other commands (e.g. inventory, read single block) have to be changed accordingly.
void SetProtocol_Command() {

  // step 1 send the command
  digitalWrite(SS_PIN, LOW);
  SPI.transfer(0x00);  // SPI control byte to send command to CR95HF
  SPI.transfer(0x02);  // Set protocol command
  SPI.transfer(0x02);  // length of data to follow
  SPI.transfer(0x01);  // code for ISO/IEC 15693
  SPI.transfer(0x0F);  // Up till 2016-06-13: crc16, single, 30%, wait for SOF (wrong: Wait for SOF, 100% modulation, append CRC)
  //    SPI.transfer(0x0D);  // Up till 2016-06-13: crc16, single, 30%, wait for SOF (wrong: Wait for SOF, 100% modulation, append CRC)
  digitalWrite(SS_PIN, HIGH);
  delay(1);

  // step 2, poll for data ready
  pollSPIUntilResponsIsReady(SS_PIN, RXBuffer);

  // step 3, read the data
  receiveSPIResponse(SS_PIN, RXBuffer);
#ifdef DEBUG
  Serial.println("RXBuffer is");
  for (byte i = 0; i < 2; i++) {
    Serial.print(RXBuffer[i], HEX);
    Serial.print(" ");
  }
#endif
  if ((RXBuffer[0] == 0) & (RXBuffer[1] == 0)) {
    Serial.println("PROTOCOL SET-");  //
    NFCReady = 1; // NFC is ready
  } else {
    Serial.println("BAD RESPONSE TO SET PROTOCOL");
    NFCReady = 0; // NFC not ready
  }
  Serial.println(" ");
}


// Reads the single block of 8 bytes with number blockNum from the BM019.
// The BM019 has 244 Blocks of 8 bytes that can be read via ISO 15693 commands. The blocks are numbered 0 to 243.
// Returns the result code of the command response (that indicates wether there was success or an error)
byte ReadSingleBlockReturn(int blockNum) {

  RXBuffer[0] = SENDRECEIVE;   // command code for send receive CR95HF command
  RXBuffer[1] = 0x03;          // length of data that follows (3 bytes)
  //    RXBuffer[2] = 0x02;          // request Flags byte, single carrier, high data rate
  RXBuffer[2] = 0x03;        // request Flags byte dual carrier, high data rate
  RXBuffer[3] = 0x20;          // read single block Command for ISO/IEC 15693
  RXBuffer[4] = blockNum;      // Block number

  // step 1 send the command
  sendSPICommand(SS_PIN, RXBuffer, 5);

  // step 2, poll for data ready
  pollSPIUntilResponsIsReady(SS_PIN, RXBuffer);

  // step 3, read the data
  receiveSPIResponse(SS_PIN, RXBuffer);

  delay(1);
#ifdef DEBUG
  // Print to Serial
  if (RXBuffer[0] == 128)  {
    Serial.printf("The block #%d:", blockNum);
    for (byte i = 3; i < RXBuffer[1] + 3 - 4; i++) {
      Serial.print(RXBuffer[i], HEX);
      Serial.print(" ");
    }
  } else {
    Serial.print("NO Single block available - ");
    Serial.print("RESPONSE CODE: ");
    Serial.println(RXBuffer[0], HEX);
  }
  Serial.println(" ");
#endif

  return RXBuffer[0];  // result code of command response
}



/// @brief  Sends command to BM019 and receives response serveral times until response with no error, max maxTrial times.
/// @detail After maxTrials trials the last response is returned, even  if there is still an error.
/// @detail Warning: Ensure that RXBuffer has appropriate size.
/// @param  ssPin slave select pin for SPI digital write
/// @param  RXBuffer buffer used for command and response
/// @param  maxTrials max number of trials
void runSPICommandUntilNoError(int ssPin, byte *command, int length, byte *RXBuffer, int maxTrials) {

  int count = 0;
  bool success;
  do {
    delay(1);
#ifdef DEBUG
    Serial.printf("Before: Count: %d, success: %b, RXBuffer[0]: %x \r\n", count, success, RXBuffer[0]);
#endif
    count++;

    // clear RXBuffer with zeros
    memset(RXBuffer, 0, sizeof(RXBuffer));

    // run SPI command
    sendPollReceiveSPINew(ssPin, command, sizeof(command), RXBuffer);
    success = responseHasNoError(RXBuffer);

#ifdef DEBUG
    Serial.printf("After: Count: %d, success: %b, RXBuffer[0]: %x \r\n", count, success, RXBuffer[0]);
#endif

  } while ( !success && (count < maxTrials));
  delay(1);
#ifdef DEBUG
  Serial.printf("Exiting at count: %d, RXBuffer[0]: %x \r\n", count, RXBuffer[0]);
#endif
}

/// @brief  Sends IDN command to BM019 and receives response serveral times until response with no error, max maxTrial times.
/// @detail After maxTrials trials the last response is returned, even  if there is still an error.
/// @detail Warning: Ensure that RXBuffer has appropriate size.
/// @param  ssPin slave select pin for SPI digital write
/// @param  RXBuffer buffer used for command and response
/// @param  maxTrials max number of trials
void runIDNCommandUntilNoError(int ssPin, byte *command, int length, byte *RXBuffer, int maxTrials) {

  int count = 0;
  bool success;
  do {

#ifdef DEBUG
    Serial.printf("Before: Count: %d, success: %b, RXBuffer[0]: %x \r\n", count, success, RXBuffer[0]);
#endif
    count++;

    // clear RXBuffer with zeros
    memset(RXBuffer, 0, sizeof(RXBuffer));

    // run SPI command
    sendPollReceiveSPINew(ssPin, command, sizeof(command), RXBuffer);
    success = idnResponseHasNoError(RXBuffer);

#ifdef DEBUG
    Serial.printf("After: Count: %d, success: %b, RXBuffer[0]: %x \r\n", count, success, RXBuffer[0]);
#endif
  } while ( !success && (count < maxTrials));
  delay(10);
#ifdef DEBUG
  Serial.printf("Exiting at count: %d, RXBuffer[0]: %x \r\n", count, RXBuffer[0]);
#endif
}


/// Runs the system information command several times, i.e. maxTrials times or until a response with no error is gotten, whatever happens first.
/// @param ssPin SS_PIN used for SPI
/// @param RXBuffer buffer used for send and receive
/// @param maxTrials maximum number of trials. If reached, the result is returned, even if there still is an error present
/// @brief  Get system information from BM019
/// @details  The response is read into RXBuffer and that's it, no matter if there is an error or not.
/// @n Command format for CR95HF:
/// @n 8 bits for request flags,
/// @n 8 bits for the get system information command,i.e 0x2B,
/// @n 64 bits for an optional UID (not used in non-addressed modes).
/// @details Example get system info command (CR95HF command embedded in BM019 command):
/// @details 0x04 ... BM019 send/receive command code
/// @details 0x02 ... BM019 length of CR95HF command data that follows
/// @details 0x02 ... CR95HF request flags byte (high data rate used)
/// @details 0x2B ... CR95HF get system information command
/// @n
/// @n
/// @details Example CR95HF response with no error:
/// @details 0x80      ... result code
/// @details 0x12      ... length of following data (12 bytes)
/// @details 0x00      ... response flags
/// @details 0x0F      ... info flags
/// @details 0x69 0x55 0x19 0x38 0x42 0x20 0x02 0xE0 ... data: UID
/// @details 0x00      ... DSFID (supported and field is present in response if bit 1 of info flags is set)
/// @details 0x00      ... AFI (supported and field is present in response if bit 2 of info flags is set)
/// @details 0x3F 0X03 ... memory size (supported and field is present in response if bit 3 of info flags is set)
/// @details 0x20      ... IC Ref (supported and field is present in response if bit 4 of info flags is set)
/// @details 0xB4 0xA9 ... CRC16
/// @details 0x00      ... error
/// @n
/// @details Example CR95HF response with error (bit 0 of response flag is set)
/// @details 0x01      ... response flags
/// @details 0x01      ... error code (returned when error bit is set)
/// @details 0xB4 0xA9 ... CRC16
/// @details 0X01      ... (error CRC16 or collision error bits)
void runSystemInformationCommandUntilNoError(int ssPin, byte *RXBuffer, int maxTrials) {
#ifdef DEBUG
  Serial.printf("ssPin: %d, maxTrials: %d, RXBuffer[0]: %x \r\n", ssPin, maxTrials, RXBuffer[0]);
#endif
  byte command[4];
  command[0] = 0x04;   // command code for send receive CR95HF command
  command[1] = 0x02;   // length of data that follows (3 bytes)
  command[2] = 0x03;   // request Flags byte, dual sub carrier
  //    command[2] = 0x02;   // request Flags byte, single sub carrier
  command[3] = 0x2B;   // get system information command for ISO/IEC 15693
  delay(10);
#ifdef DEBUG
  Serial.printf("ssPin: %d, maxTrials: %d, RXBuffer[0]: %x \r\n", ssPin, maxTrials, RXBuffer[0]);
#endif
  // run command until no error, but only max 10 times
  runSPICommandUntilNoError(ssPin, command, sizeof(command), RXBuffer, maxTrials);
}

/// Runs the inventory  command several times, i.e. maxTrials times or until a response with no error is gotten, whatever happens first.
/// @param ssPin SS_PIN used for SPI
/// @param RXBuffer buffer used for send and receive
/// @param maxTrials maximum number of trials. If reached, the result is returned, even if there still is an error present
void runIDNCommand(int ssPin, byte *RXBuffer, int maxTrials) {

#ifdef DEBUG
  Serial.printf("ssPin: %d, maxTrials: %d, RXBuffer[0]: %x \r\n", ssPin, maxTrials, RXBuffer[0]);
#endif

  byte command[2];
  command[0] = 0x01;   // command code for send receive CR95HF command
  command[1] = 0x00;   // length of data that follows (0 bytes)
  delay(10);

#ifdef DEBUG
  Serial.printf("ssPin: %d, maxTrials: %d, RXBuffer[0]: %x \r\n", ssPin, maxTrials, RXBuffer[0]);
#endif
  // run command until no error, but only max 10 times
  runIDNCommandUntilNoError(ssPin, command, sizeof(command), RXBuffer, maxTrials);
}


//Example response of CR95HF for inventory command and data positions/indices
//+------+--------+----------------------------------------------------------------------+
//|Result| Length | Data                                                                 |
//| code |        +--------+-----+---------------------------------------+---------+-----+
//|      |        |Response|     |                                       |         |     |
//|      |        | flags  |DSFID| UID                                   |CRC16    |Error|
//+------+--------+--------+---------------------------------------------+---------+-----+
//| 0x80 |0x0D(13)| 0x00   |0x00 |0x51 0x69 0x19 0x38 0x42 0x20 0x02 0xE0|0x84 0x28|0x00 |
//+------+--------+--------+-----+---------------------------------------+---------+-----+
//|   0  |  1     |   2    |  3  | 4    5    6    7    8    9    10   11 | 12   13 | 14  |
//+------+--------+--------+-----+---------------------------------------+---------+-----+
//                    0       1    2    3    4    5    6    7     8    9   10   11   12
//

/// Retreive idn data from RXBuffer from IDN command
/// This ist the struct later to be transmitted via bluetooth
/// @detail There is no error possible in the response since this is just pure device information and thus not rely on RFID and a tag in the field
/// @param RXBuffer buffer containing the response from the IDN command
/// @param idnType struct with retreived data
IDNDataType idnDataFromIDNResponse(byte *RXBuffer) {

  IDNDataType idnData;
  idnData.resultCode = RXBuffer[0];

  // Device ID has 13 bytes
  for (int i = 0; i < 13; i++) {
    idnData.deviceID[i] = RXBuffer[i + 2]; // TODO: cchek and continue here
  }

  // ROM CRC are the last two bytes of the data
  int length = RXBuffer[2];
  idnData.romCRC[0] = RXBuffer[length - 2];
  idnData.romCRC[1] = RXBuffer[length - 1];

  return idnData;
}



/// Retreive system information from RXBuffer from system information command
/// This ist the struct later to be transmitted via bluetooth
/// @param RXBuffer buffer containing the response from the system information command
/// @param SystemInformationType struct with retreived data
SystemInformationDataType systemInformationDataFromGetSystemInformationResponse(byte *RXBuffer) {
  //    SystemInformationType retreiveSystemInformationValues(byte *RXBuffer) {

  SystemInformationDataType systemInformationData;

  systemInformationData.resultCode = RXBuffer[0];
  systemInformationData.responseFlags = RXBuffer[2];

  // check for no error in result code and handle accordingly
  if (systemInformationData.resultCode == 0x80) { // no error in result code

    // check for no error in response flags
    if ((systemInformationData.responseFlags & 0x01) == 0) {
      // no error in response flags
      systemInformationData.infoFlags = RXBuffer[3];
      for (int i = 0; i < 8; i++) {
        systemInformationData.uid[i] = RXBuffer[11 - i];
      }
      systemInformationData.errorCode = RXBuffer[RXBuffer[1] + 2 - 1];
    } else {
      // error case
      systemInformationData.errorCode = RXBuffer[3];
    }
  } else {
    // error case
    clearBuffer(systemInformationData.uid);
    systemInformationData.errorCode = RXBuffer[3];
  }
  return systemInformationData;
}


/// Sends a packet of data (c-struct) via bluetooth to a smartphone application
/// @detail Any packet to be transfered is a c-struct. These structs are defined in data_types.h.
/// @param packetIdentifier identifier that can be used to treat a packet separately in the app. Identifiers are defined in constants.h
/// @param txFlags don't know yet, what these are fore
/// @param *packetBytes pointer on the c-struct, that is the packet
/// @param byteCount number of bytes to be transfered
bool pumpViaBluetooth(unsigned short packetIdentifier, UBP_TxFlags txFlags, const char *packetBytes, unsigned short byteCount) {

  bool success = UBP_queuePacketTransmission(packetIdentifier, txFlags, packetBytes, byteCount);

  delay(1);
#ifdef DEBUG
  if (success) Serial.println("Packet queued successfully");
  else Serial.println("Failed to enqueue packet");
#endif
  // put your main code here, to run repeatedly:
  while (UBP_isBusy() == true) UBP_pump();
}

/// Returns the voltage on the Simblee/RFduino VDD pin as a float in Volts.
/// Code is from the RFduino Forum, see http://forum.rfduino.com/index.php?topic=265.0 for details
float voltageOnVDD() {
  analogReference(VBG);                // Sets the Reference to 1.2V band gap
  analogSelection(VDD_1_3_PS);         // Selects VDD with 1/3 prescaling as the analog source
  int sensorValue = analogRead(1);     // the pin has no meaning, it uses VDD pin
  return sensorValue * (3.6 / 1023.0); // convert value to voltage;
}

/// Print all data of systemInformationData to serial console
void printSystemInformationData(SystemInformationDataType systemInformationData) {

  Serial.println("Printing system information data to serial output:");

  Serial.printf("Result code: %x\r\n", systemInformationData.resultCode);
  Serial.printf("Response flags: %x\r\n", systemInformationData.responseFlags);

  Serial.printf("uid: %x", systemInformationData.uid[0]);
  for (int i = 1; i < 8; i++) {
    Serial.printf(":%x", systemInformationData.uid[i]);
  }
  Serial.println("");

  Serial.printf("Error code: %x\r\n", systemInformationData.errorCode);
}

///===================================================================================================
// The loop
///===================================================================================================

void loop() {

#ifdef DEBUG
  Serial.println("In the loop");
#endif

  // Start up BM019 if not yet started
  if (NFCReady == 0) {

    delay(100);
    SetProtocol_Command(); // ISO 15693 settings
    Serial.println("After SetProtocoll_Command()");
    delay(100);

  } else {


    // ------- Read system information from BM019 ----------------------------------------------------------------------------
//#ifdef DEBUG
    Serial.println("Get system information command ...");
//#endif
    runSystemInformationCommandUntilNoError(SS_PIN, RXBuffer, 10);

#ifdef DEBUG
    Serial.println("... retreive system information ...");
#endif
    SystemInformationDataType systemInformationData = systemInformationDataFromGetSystemInformationResponse(RXBuffer);



    //------- Read IDN information from BM019 (IDN Command) -------------------------------------------------------------------

    //#ifdef DEBUG
    Serial.println("IDN command ...");
    //#endif
    runIDNCommand(SS_PIN, RXBuffer, 10);
#ifdef DEBUG
    Serial.println("... retreive IDN information ...");
#endif
    IDNDataType idnData = idnDataFromIDNResponse(RXBuffer);


    // ----------- Read 43 data blocks into RXBuffer ---------------

    //#ifdef DEBUG
    Serial.println("Read all data");
    //#endif

    for (int i = 0; i < sizeof(RXBuffer); i++) {
      RXBuffer[i] = 0;
    }
    for (int i = 0; i < sizeof(dataBuffer); i++) {
      dataBuffer[i] = 0;
    }

    byte resultCode = 0;
    int trials = 0;
    int maxTrials = 10;
    for (int i = 0; i < 43; i++) { // Need only 43 of 244 blocks
      resultCode = ReadSingleBlockReturn(i);

#ifdef DEBUG
      printf("resultCode 0x%x\n\r", resultCode);
#endif
      if (resultCode != 0x80 && trials < maxTrials) {
        printf("Error 0x%x\n\r", resultCode);
        i--;        // repeat same block if error occured, but
        trials++;   // not more than maxTrials times per block
      } else if (trials >= maxTrials) {
        break;
      } else {
        trials = 0;

        for (int j = 3; j < RXBuffer[1] + 3 - 4; j++) {
          dataBuffer[i * 8 + j - 3] = RXBuffer[j];
#ifdef DEBUG
          Serial.print(RXBuffer[j], HEX);
          Serial.print(" ");
#endif
        }
      }
    }

    // ----------- All data collected, send BM019 to hibernate -------------------------

    //#ifdef DEBUG
    Serial.println("Sending CR95HF to hibernate ...");
    //#endif
    sendCR95HFToHibernate(SS_PIN);



    // ------- Transmit system information data via bluetooth. By convention this is the first transmission -----------------

    bool ergo = pumpViaBluetooth(SYSTEM_INFORMATION_DATA, UBP_TxFlagIsRPC, (char *) &systemInformationData, sizeof(SystemInformationDataType));
#ifdef DEBUG
    printSystemInformationData(systemInformationData);
#endif



    //-------- transmit dataBuffer via bluetooth ---------------------------------------------------------

    AllBytesDataType allBytes;
#ifdef DEBUG
    Serial.println("----about to send all data bytes packet");
#endif
    for (int i = 0; i < sizeof(allBytes.allBytes); i++) {
      allBytes.allBytes[i] = 0;
    }
    for (int i = 0; i < 344; i++) {
      allBytes.allBytes[i] = dataBuffer[i];
    }
    //#ifdef DEBUG
    Serial.printf("Sizeof ist : %d\n", sizeof(AllBytesDataType));
    //#endif
    bool success = UBP_queuePacketTransmission(ALL_BYTES, UBP_TxFlagIsRPC, (char *) &allBytes, sizeof(AllBytesDataType));
#ifdef DEBUG
    if (success) Serial.println("----all data bytes packet queued successfully");
    else Serial.println("----Failed to enqueue all data bytes packet");
#endif
    while (UBP_isBusy() == true) UBP_pump();

    //-------- Read Battery level and Simblee temperature and transmit via bluetooth ---------------------

    BatteryDataType batteryData;
    batteryData.voltage = voltageOnVDD();
#ifdef SIMBLEE
    batteryData.temperature = Simblee_temperature(CELSIUS);
#else
    batteryData.temperature = RFduino_temperature(CELSIUS);
#endif

#ifdef DEBUG
    Serial.printf("Battery voltage: %f\r\n", batteryData.voltage);
#endif
    // Transmitt via bluetooth
    success = UBP_queuePacketTransmission(BATTERY_DATA, UBP_TxFlagIsRPC, (char *) &batteryData, sizeof(BatteryDataType));
    //        if (success) Serial.println("Battery data packet queued successfully");
    //        else Serial.println("Failed to enqueue battery data packet");
    // put your main code here, to run repeatedly:
    while (UBP_isBusy() == true) UBP_pump();

#ifdef DEBUG
    Serial.printf("Sent Battery voltage: %f\r\n", batteryData.voltage);
#endif


    //-------- transmit IDN data via bluetooth. By convention this is the last transmission -----------------

    ergo = pumpViaBluetooth(IDN_DATA, UBP_TxFlagNone, (char *) &idnData, sizeof(IDNDataType));
    success = UBP_queuePacketTransmission(IDN_DATA, UBP_TxFlagIsRPC, (char *) &idnData, sizeof(IDNDataType));
    delay(10);
#ifdef DEBUG
    if (success) Serial.println("IDN data packet queued successfully");
    else Serial.println("Failed to enqueue IDN data packet");
#endif
    // put your main code here, to run repeatedly:
    while (UBP_isBusy() == true) UBP_pump();

#ifdef DEBUG
    Serial.printf("IDN: %x", idnData.deviceID[0]);
    for (int i = 1; i < 13; i++) {
      Serial.printf(":%x", idnData.deviceID[i]);
    }
    Serial.println("... done");
#endif


    //--------- send Simblee into ultra low power mode ---------------------------------------------------

    //#ifdef DEBUG
    Serial.println("Sending Simblee/RFduino to sleep ...");
    //#endif
    RFduino_ULPDelay(SLEEP_DURATION); //


    //--------- send Simblee woke up again, now also wake up BM019 and repeat the loope cycle ------------

#ifdef DEBUG
    Serial.println("... Simblee/RFduino woke up again");
    Serial.println("Wake up CR95HF with wake up pulse...");
#endif
    sendWakeupPulse(IRQ_PIN);  // Wake up BM019 (low pulse on IRQ_PIN)
    readWakeUPEventRegister(SS_PIN, RXBuffer);
    setupSPI();

    delay(10);
    SetProtocol_Command(); // ISO 15693 settings
    delay(100);

#ifdef DEBUG
    Serial.println("... CR95HF woke up again. Receiving wake up response");
#endif
  }
}