Wednesday, January 27, 2016

ACR122U USB Near Field Communication (NFC),  Arduino, Siemens PLC, and Modbus




Today about Near Field Communication Article, and called NFC.
I use ACR122U USB NFC Tag Reader & Writer, and this article about how to use ACR122U USB NFC Reader for Get UID of NFC Tags.
In ACR122U Software usually there are: Get Data and Get ATR.

in this article about NFC Get Data:
Get data (UID) from  NFC Tags and transfer / send to Siemens PLC via Modbus communication with Arduino Help.
ACR122U NFC Reader same with NFC for Android, NFC for iPhone, NFC for Smart phone and etc.

ACR122U NFC, Arduino, and Siemens PLC


Hardware Needed for this NFC Application

  1. ACR122U USB NFC Tag Reader & Writer
  2. NFC / Near Field Communication Tags, I use:
    • 2 pieces NFC Chip NTAG213 / Universal NFC tags sticker
    • 2 pieces NFC  / Near Field Communication Cards

  3. Arduino USB Host Shield
  4. Arduino UNO
  5. TTL to Male RS232 Module
  6. Power Supply DC 5 Volt for Arduino and ACR122U USB NFC
  7. Siemens PLC with Modbus Slave Support, or other device with Modbus Slave Support
  8. RS232 PLC Cable
  9. 4 pieces Lamp / Light for testing


NFC / Near Field Communication Hardware

NFC Hardware


Hardware Connections for this NFC Application

1. ACR122U USB NFC Reader, Arduino and Siemens PLC

ACR122U USB NFC Reader, Arduino and Siemens PLC

2. Siemens PLC to Light

  • Light 1 connect to Siemens PLC Output Q0.0
  • Light 2 connect to Siemens PLC Output Q0.1
  • Light 3 connect to Siemens PLC Output Q0.2
  • Light 4 connect to Siemens PLC Output Q0.3


Arduino Software and Library for this NFC Application

  1. I use Arduino Software version 1.6.6
  2. NFC / Near Field Communication Arduino Library: click here


ACR122U Software / ACR122U Tool Download

1. ACR122U SDK Download

I use Windows 7, for download : click here


Project File for this NFC Application

  1. Arduino project file : click here
  2. Siemens PLC S7-200 project file : click here


Siemens PLC and NFC / Near Field Communication Programming




Modbus Addressing in PLC Ladder Programming

Modbus Addressing 40000 in PLC Ladder Programming


Arduino Code for this NFC Application

#include <usbhub.h>
#include <SimpleModbusMaster.h>

#define MODBUSSlaveAddress 1
#define MODBUSbaud 9600
#define MODBUSformat SERIAL_8E1
#define MODBUStimeout 100
#define MODBUSpolling 1
#define MODBUSretry_count 0
#define MODBUSTxEnablePin 2 

enum
{
  MODBUSPACKET1,
  MODBUSTOTAL_NO_OF_PACKETS
};

Packet MODBUSpackets[MODBUSTOTAL_NO_OF_PACKETS];

packetPointer MODBUSpacket1 = &MODBUSpackets[MODBUSPACKET1];


#define NFC_Hardware "ACR122U"
#define NFC_Tags_Max 7

unsigned int MODBUSwriteRegs[NFC_Tags_Max+1];


USB Usb;
USB_DEVICE_DESCRIPTOR buf;

uint8_t addr;
uint8_t rcode;
uint8_t NFC_USB_State;
bool NFC_USB_RUN = false;
uint8_t  NFC_Receive[64];

String NFC_Receive_String = "";
unsigned long NFC_Get_UID_Timeout;
uint16_t rcvd;
uint16_t NFC_Receive_Size;
uint16_t NFC_Tags_Size;
uint8_t  NFC_Tags[NFC_Tags_Max];
unsigned int NFC_Send_Success;
  
uint8_t NFC_Order;
uint8_t NFC_EPP_OUT = 0x22; //NFC Endpoint Address Out Transfer : 0x02
uint8_t NFC_EPP_IN1 = 0x01; //NFC Endpoint Address In Transfer 1: 0x81
uint8_t NFC_EPP_IN2 = 0x02; //NFC Endpoint Address In Transfer 2: 0x82

uint8_t NFC_Easy_Connect_Code[15] =  {0x6B,0x05,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0xFF,0x00,0x48,0x00,0x00};
uint8_t NFC_Reader_Code[10] =  {0x62,0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00};
uint8_t NFC_Get_UID_Code[15] =  {0x6F,0x05,0x00,0x00,0x00,0x00,0x03,0x04,0x00,0x00,0xFF,0xCA,0x00,0x00,0x00};

  
void setup() {
    if (Usb.Init() == -1){
      //Near Field Communication (NFC) USB Reader did not start
      while(1);   
    }
 
modbus_construct(MODBUSpacket1, MODBUSSlaveAddress, PRESET_MULTIPLE_REGISTERS, 0, NFC_Tags_Max+1, MODBUSwriteRegs);
  
modbus_configure(&Serial, MODBUSbaud, MODBUSformat, MODBUStimeout, MODBUSpolling, MODBUSretry_count, MODBUSTxEnablePin, MODBUSpackets, MODBUSTOTAL_NO_OF_PACKETS);

  NFC_USB_State=0;
  NFC_Order=1;
  NFC_Receive_String.reserve(64);
}

void loop() {  
  Usb.Task();
  if( Usb.getUsbTaskState() == USB_STATE_RUNNING )
  {
  NFC_USB_RUN = true;

            switch(NFC_USB_State) {
                    case 0:  // NFC USB Configuration                  
                            rcode = ACR122U_NFC_Configuration();
                            if(rcode){
                              asm volatile ("  jmp 0");
                            }else{
                              NFC_USB_State=1;
                            }
                            break;

                            
                      case 1: // ACR122U Open NFC or NFC Connect
                      NFC_Order++;                                      
                      rcode = ACR122U_Open_NFC();                  
                      if(rcode){
                        NFC_USB_State=1;
                      }else{
                        NFC_USB_State=2;
                      }
                      break;
                      

                    case 2: // ACR122U USB NFC Setup
                      NFC_Order++; 
                      rcode = ACR122U_USB_NFC_Reader();                   
                      if(rcode){
                        NFC_USB_State=2;
                      }else{
                        NFC_USB_State=3;
                      }
                      break;
                      
                      
                    case 3: // ACR122U USB NFC Tag Reader
                        NFC_Receive_Size=0;
                        NFC_Receive[0]=0;
                        NFC_Receive[1]=0;
                        rcode = ACR122U_USB_NFC_Read(NFC_EPP_IN1,&NFC_Receive_Size, NFC_Receive, 1);
                        if(rcode){
                          NFC_USB_State=3;
                        }else{
                          if(NFC_Receive_Size==2){
                            if(NFC_Receive[0]==0x50 && NFC_Receive[1]==0x03 ){
                              NFC_Get_UID_Timeout = millis() + 100;
                              NFC_USB_State=4;
                            }
                          }
                        }
                        break;
                        
                      
                    case 4: // ACR122U NFC Get Data UID
                      NFC_Order++;
                      NFC_Tags_Size=0;
                      rcode = ACR122U_USB_NFC_Tag_Reader(&NFC_Tags_Size, NFC_Tags);
                      if(rcode){
                        if(millis() > NFC_Get_UID_Timeout)NFC_USB_State=3;
                      }else{
                        if(NFC_Tags_Size>0){
                          memset(MODBUSwriteRegs,0,sizeof(MODBUSwriteRegs));
                          MODBUSwriteRegs[0]=NFC_Tags_Size;
                          for(uint16_t i=0; i < NFC_Tags_Size; i++ ) {
                          MODBUSwriteRegs[i+1]= NFC_Tags[i];
                          }
                          NFC_Send_Success = MODBUSpacket1->successful_requests;
                          NFC_Get_UID_Timeout = millis() + 1000;
                          NFC_USB_State=5;
                        }else{
                          if(millis() > NFC_Get_UID_Timeout)NFC_USB_State=3;
                        }
                      }
                      break;  


                    case 5: // NFC UID Send to Siemens PLC
                      modbus_update();
                      if(NFC_Send_Success != MODBUSpacket1->successful_requests)NFC_USB_State=3;
                      if(millis() > NFC_Get_UID_Timeout)NFC_USB_State=3;
                      break;
                                       
            }
            
  }else{
    if(NFC_USB_RUN){
      // ACR122U NFC USB Not RUN
      asm volatile ("  jmp 0"); 
    }
  }


}



void NFC_USB_GetAddresses(UsbDevice *pdev)
{
    UsbDeviceAddress adr;
    adr.devAddress = pdev->address.devAddress;
    addr = adr.devAddress;
}

uint8_t ACR122U_NFC_Configuration() {
  uint8_t Rcode;
  Usb.ForEachUsbDevice(&NFC_USB_GetAddresses);
  Rcode = Usb.getDevDescr(addr, 0, sizeof (USB_DEVICE_DESCRIPTOR), (uint8_t*) & buf);
  if (Rcode) {
    return (Rcode);
  }else{
    Rcode = Usb.setConf(addr, 0, buf.bNumConfigurations);
    return (Rcode);            
  }        
  return (USB_STATE_ERROR);
}




uint8_t ACR122U_Open_NFC() { 
 uint8_t Rcode;  
 NFC_Easy_Connect_Code[6]=NFC_Order;
 Rcode =  ACR122U_USB_NFC_Write(NFC_EPP_OUT,sizeof(NFC_Easy_Connect_Code),NFC_Easy_Connect_Code); 
 if(Rcode)
    return Rcode;

  rcvd=0;
  NFC_Receive[0]=0;
  NFC_Receive[1]=0;
  Rcode = ACR122U_USB_NFC_Read(NFC_EPP_IN2,&rcvd, NFC_Receive, 10);  
  if(Rcode)
    return Rcode; 

  if(rcvd<12)
    return (1);

   if(NFC_Receive[0]!=0x83 || NFC_Receive[1]!=0x0A)
     return (1);     
  
  NFC_Receive_String="";
  for(uint16_t i=7; i < rcvd; i++ )
    NFC_Receive_String += String(char(NFC_Receive[i]));   

  if (NFC_Receive_String.indexOf(NFC_Hardware)!=-1)
    return (0); 

return (1);        
}



uint8_t ACR122U_USB_NFC_Reader() {
 uint8_t Rcode;  
 NFC_Reader_Code[6]=NFC_Order;
 Rcode =  ACR122U_USB_NFC_Write(NFC_EPP_OUT,sizeof(NFC_Reader_Code),NFC_Reader_Code); 
 if(Rcode)
    return Rcode;

  rcvd=0;
  NFC_Receive[0]=0;
  Rcode = ACR122U_USB_NFC_Read(NFC_EPP_IN2,&rcvd, NFC_Receive, 10);   
  if(Rcode)
    return Rcode; 

  if(rcvd<12)
    return (1);

   if(NFC_Receive[0]==0x80)
     return (0);
     
return (1);
}



uint8_t ACR122U_USB_NFC_Tag_Reader(uint16_t *NFC_Key_Size, uint8_t* NFC_Key) {
  
 *NFC_Key_Size=0; 
 uint8_t Rcode;  
 NFC_Get_UID_Code[6]=NFC_Order;
 Rcode =  ACR122U_USB_NFC_Write(NFC_EPP_OUT,sizeof(NFC_Get_UID_Code),NFC_Get_UID_Code); 
 if(Rcode)
    return Rcode;


  rcvd=0;
  NFC_Receive[0]=0;
  NFC_Receive[1]=0;
  Rcode = ACR122U_USB_NFC_Read(NFC_EPP_IN2,&rcvd, NFC_Receive, 50);  
  if(Rcode)
    return Rcode; 

  if(rcvd<12)
    return (1);

   uint16_t Buffer_NFC_Key_Size = 0;      
   if(NFC_Receive[0]==0x80 && NFC_Receive[1]>0x02){      
      for(uint16_t i=10; i < (rcvd-2); i++ ) {
      *NFC_Key++ = NFC_Receive[i];
      Buffer_NFC_Key_Size++; 
      }
      
      *NFC_Key_Size = Buffer_NFC_Key_Size;       
     return (0);
   }

return (1);
}



uint8_t ACR122U_USB_NFC_Write(uint8_t vHXFR,uint16_t nbytes, uint8_t* data) {
    Usb.bytesWr(rSNDFIFO, nbytes, data);
    Usb.regWr(rSNDBC, nbytes);
    Usb.regWr(rHXFR, vHXFR);
    while(!(Usb.regRd(rHIRQ) & bmHXFRDNIRQ));
    Usb.regWr(rHIRQ, bmHXFRDNIRQ);       
  return (0);
}


uint8_t ACR122U_USB_NFC_Read(uint8_t vHXFR,uint16_t *pktsize, uint8_t* data, unsigned long timeout) {
  unsigned long timeout_start = millis() + timeout;
    
  while((long)(millis() - timeout_start) < 0L) {
    Usb.regWr(rHXFR, vHXFR);
      if((Usb.regRd(rHIRQ) & bmRCVDAVIRQ)==bmRCVDAVIRQ){
      uint16_t buff_pktsize = Usb.regRd(rRCVBC);
      *pktsize = buff_pktsize;
      data = Usb.bytesRd(rRCVFIFO, buff_pktsize, data);
      Usb.regWr(rHIRQ, bmRCVDAVIRQ);
      return (0);   
      }   
   }      
             
  return (1);
}


Video Demonstration: ACR122U USB NFC Near Field Communication, Arduino, and Siemens PLC


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