Nodemcu can't communicate with BM019 NFC via SPI

Post topics, source code that relate to the Arduino Platform
 Reply

User avatar

Nodemcu can't communicate with BM019 NFC via SPI

By punitguptatkd
- Mon Apr 22, 2019 3:18 pm #81976 when I upload this code to UNO it works well but when I use this code with Nodemcu it does not show anything on the serial monitor.
I don't have much knowledge to rectify this problem so please help.
Thanks in advance.


Code: Select all/*
NFC Communication with the Solutions Cubed, LLC BM019
and an Arduino Uno.  The BM019 is a module that
carries ST Micro's CR95HF, a serial to NFC converter.

Wiring:
 Nodemcu          BM019
 IRQ: Pin 5       DIN: pin 2
 SS: pin 15       SS: pin 3
 MOSI: pin 13     MOSI: pin 5
 MISO: pin 12     MISO: pin4
 SCK: pin 14      SCK: pin 6
 
 */

// the sensor communicates using SPI, so include the library:
#include <SPI.h>

const int SSPin = 15;  // Slave Select pin
const int IRQPin = 5;  // Sends wake-up pulse
byte TXBuffer[40];    // transmit buffer
byte RXBuffer[40];    // receive buffer
byte NFCReady = 0;  // used to track NFC state


void setup() {
    pinMode(IRQPin, OUTPUT);
    digitalWrite(IRQPin, HIGH); // Wake up pulse
    pinMode(SSPin, OUTPUT);
    digitalWrite(SSPin, HIGH);

    Serial.begin(9600);
    Serial.println("Started");
    SPI.begin();
    SPI.setDataMode(SPI_MODE0);
    SPI.setBitOrder(MSBFIRST);
    SPI.setClockDivider(SPI_CLOCK_DIV32);
 
 // The CR95HF requires a wakeup pulse on its IRQ_IN pin
 // before it will select UART or SPI mode.  The IRQ_IN pin
 // is also the UART RX pin for DIN on the BM019 board.
 
    delay(10);                      // send a wake up
    digitalWrite(IRQPin, LOW);      // pulse to put the
    delayMicroseconds(100);         // BM019 into SPI
    digitalWrite(IRQPin, HIGH);     // mode
    delay(10);
}

/* IDN_Command identifies the CR95HF connected to the Arduino.
This requires three steps.
1. send command
2. poll to see if CR95HF has data
3. read the response

If the correct response is received the serial monitor is used
to display the CR95HF ID number and CRC code.  This rountine is
not that useful in using the NFC functions, but is a good way to
verify connections to the CR95HF.
*/
void IDN_Command()
 {
 byte i = 0;

// step 1 send the command
  digitalWrite(SSPin, LOW);
  SPI.transfer(0);  // SPI control byte to send command to CR95HF
  SPI.transfer(1);  // IDN command
  SPI.transfer(0);  // length of data that follows is 0
  digitalWrite(SSPin, HIGH);
  delay(1);
 
// step 2, poll for data ready
// data is ready when a read byte
// has bit 3 set (ex:  B'0000 1000')

  digitalWrite(SSPin, LOW);
  while(RXBuffer[0] != 8)
    {
    RXBuffer[0] = SPI.transfer(0x03);  // Write 3 until
    RXBuffer[0] = RXBuffer[0] & 0x08;  // bit 3 is set
    }
  digitalWrite(SSPin, HIGH);
  delay(1);


// step 3, read the data
  digitalWrite(SSPin, LOW);
  SPI.transfer(0x02);   // SPI control byte for read         
  RXBuffer[0] = SPI.transfer(0);  // response code
  RXBuffer[1] = SPI.transfer(0);  // length of data
  for (i=0;i<RXBuffer[1];i++)     
      RXBuffer[i+2]=SPI.transfer(0);  // data
  digitalWrite(SSPin, HIGH);
  delay(1);

  if ((RXBuffer[0] == 0) & (RXBuffer[1] == 15))
  { 
    Serial.println("IDN COMMAND-");  //
    Serial.print("RESPONSE CODE: ");
    Serial.print(RXBuffer[0]);
    Serial.print(" LENGTH: ");
    Serial.println(RXBuffer[1]);
    Serial.print("DEVICE ID: ");
    for(i=2;i<(RXBuffer[1]);i++)
    {
      Serial.print(RXBuffer[i],HEX);
      Serial.print(" ");
    }
    Serial.println(" ");
    Serial.print("ROM CRC: ");
    Serial.print(RXBuffer[RXBuffer[1]],HEX);
    Serial.print(RXBuffer[RXBuffer[1]+1],HEX);
    Serial.println(" ");
  }
  else
    Serial.println("BAD RESPONSE TO IDN COMMAND!");

  Serial.println(" ");
}

/* SetProtocol_Command programs the CR95HF for
ISO/IEC 15693 operation.

This requires three steps.
1. send command
2. poll to see if CR95HF has data
3. read the response

If the correct response is received the serial monitor is used
to display successful programming.
*/
void SetProtocol_Command()
 {
 byte i = 0;
 
// step 1 send the command
  digitalWrite(SSPin, 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(0x0D);  // Wait for SOF, 10% modulation, append CRC
  digitalWrite(SSPin, HIGH);
  delay(1);
 
// step 2, poll for data ready

  digitalWrite(SSPin, LOW);
  while(RXBuffer[0] != 8)
    {
    RXBuffer[0] = SPI.transfer(0x03);  // Write 3 until
    RXBuffer[0] = RXBuffer[0] & 0x08;  // bit 3 is set
    }
  digitalWrite(SSPin, HIGH);
  delay(1);

// step 3, read the data
  digitalWrite(SSPin, LOW);
  SPI.transfer(0x02);   // SPI control byte for read         
  RXBuffer[0] = SPI.transfer(0);  // response code
  RXBuffer[1] = SPI.transfer(0);  // length of data
  digitalWrite(SSPin, HIGH);

  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(" ");
}

/* Inventory_Command chekcs to see if an RF
tag is in range of the BM019.

This requires three steps.
1. send command
2. poll to see if CR95HF has data
3. read the response

If the correct response is received the serial monitor is used
to display the the RF tag's universal ID. 
*/
void Inventory_Command()
 {
 byte i = 0;

// step 1 send the command
  digitalWrite(SSPin, LOW);
  SPI.transfer(0x00);  // SPI control byte to send command to CR95HF
  SPI.transfer(0x04);  // Send Receive CR95HF command
  SPI.transfer(0x03);  // length of data that follows is 0
  SPI.transfer(0x26);  // request Flags byte
  SPI.transfer(0x01);  // Inventory Command for ISO/IEC 15693
  SPI.transfer(0x00);  // mask length for inventory command
  digitalWrite(SSPin, HIGH);
  delay(1);
 
// step 2, poll for data ready
// data is ready when a read byte
// has bit 3 set (ex:  B'0000 1000')

  digitalWrite(SSPin, LOW);
  while(RXBuffer[0] != 8)
    {
    RXBuffer[0] = SPI.transfer(0x03);  // Write 3 until
    RXBuffer[0] = RXBuffer[0] & 0x08;  // bit 3 is set
    }
  digitalWrite(SSPin, HIGH);
  delay(1);


// step 3, read the data
  digitalWrite(SSPin, LOW);
  SPI.transfer(0x02);   // SPI control byte for read         
  RXBuffer[0] = SPI.transfer(0);  // response code
  RXBuffer[1] = SPI.transfer(0);  // length of data
  for (i=0;i<RXBuffer[1];i++)     
      RXBuffer[i+2]=SPI.transfer(0);  // data
  digitalWrite(SSPin, HIGH);
  delay(1);

  if (RXBuffer[0] == 128)
  { 
    Serial.println("TAG DETECTED");
    Serial.print("UID: ");

    for(i=11;i>=4;i--)
    {
      Serial.print(RXBuffer[i],HEX);
      Serial.print(" ");
    }
    Serial.println(" ");
        delay(500);
  }
  else
    {
    Serial.print("NO TAG IN RANGE - ");
    Serial.print("RESPONSE CODE: ");
    Serial.println(RXBuffer[0],HEX);
    }
  Serial.println(" ");
}


void loop() {

  if(NFCReady == 0)
  {
    IDN_Command();  // reads the CR95HF ID
    delay(1000);
    SetProtocol_Command(); // ISO 15693 settings
    delay(1000);
  }
  else
  {
    Inventory_Command();
    delay(10);   
  } 
 
}
 Reply
Return to Arduino