File content as of revision 0:892175366555:

/**
  ******************************************************************************
  * @file    tagtype5_wrapper.c 
  * @author  MMY Application Team
  * @version $Revision: 1638 $
  * @date    $Date: 2016-02-10 16:41:05 +0100 (Wed, 10 Feb 2016) $
  * @brief   Interface for tagtype5 in order to use NDEF lib
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
  *
  * Licensed under ST MYLIBERTY SOFTWARE LICENSE AGREEMENT (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/myliberty  
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
  * AND SPECIFICALLY DISCLAIMING THE IMPLIED WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "tagtype5_wrapper.h"
#include "lib_NDEF.h"


/**
  * @brief  This function read the data stored in NDEF file at defined offset.
  * @param  Offset : Offset in the NDEF file.
  * @param  DataSize : Number of byte to read.
  * @param  pData : pointer on buffer to store read data.
  * @retval NDEF_ERROR_MEMORY_INTERNAL : Size not compatible with memory.
  * @retval NDEF_ERROR_NOT_FORMATED : CCFile data not supported.
  * @retval NDEF_ERROR : No NDEF in the tag.
  * @retval NDEF_OK : The operation is completed.
  */
uint16_t NFCType5::ReadData( uint16_t Offset , uint16_t DataSize , uint8_t* pData )
{
  uint16_t status = NDEF_ERROR;
  uint8_t atlv_detect[4];
  uint8_t index = 0;
  
  /* Do not include length bytes */
  DataSize -= FIRST_RECORD_OFFSET;
  
  /* If too many data to write return error */
  if( DataSize > NDEF_MAX_SIZE )
  {
    return NDEF_ERROR_MEMORY_INTERNAL;
  }
  
  /* Detect NDEF message in memory */
  status = NfcType5_NDEFDetection( );
  if( status != NDEF_OK )
  {
    return status;
  }
  
  /* Read TL of Type 5 */
  status = NFCTAG_ReadData( atlv_detect, CCFileStruct.NDEF_offset, 4 );
  if( status != NDEF_OK )
  {
    return status;
  }
  
  /* Check if L is on 3 or 1 byte and update length in buffer */
  if( atlv_detect[1] == NFCT5_3_BYTES_L_TLV )
  {
    pData[0] = atlv_detect[2];
    pData[1] = atlv_detect[3];
    index += 4;
  }
  else
  {
    pData[0] = 0x00;
    pData[1] = atlv_detect[1];
    index += 2;
  }
  
  /* Check CC file is in the correct mode to proceed */
  if( CCFileStruct.State ==  TT5_INITIALIZED )
  {
    return NDEF_ERROR;
  }

  if( ((Offset == 0) && (DataSize > 0)) || (Offset > 0) )
  {
    /* Read NDEF */
    if( NFCTAG_ReadData( (pData + FIRST_RECORD_OFFSET), CCFileStruct.NDEF_offset + index + Offset, DataSize ) != NFCTAG_OK )
    {
      return NDEF_ERROR;
    }
  }
  
  return NDEF_OK;
}

/**
  * @brief  This function writes data in NDEF file at defined offset.
  * @param  Offset : Offset in the NDEF file.
  * @param  DataSize : Number of byte to write.
  * @param  pData : pointer on buffer to copy.
  * @retval NDEF_ERROR_MEMORY_INTERNAL : Size not compatible with memory.
  * @retval NDEF_ERROR_NOT_FORMATED : CCFile data not supported.
  * @retval NDEF_ERROR : No NDEF in the tag.
  * @retval NDEF_OK : The operation is completed.
  */
uint16_t NFCType5::WriteData( uint16_t Offset , uint32_t DataSize , uint8_t *pData )
{
  uint8_t atlv[4];
  uint8_t index = 0;
  uint16_t NDEF_Size = 0;
  NFCTAG_StatusTypeDef status;

  /* Do not include length bytes */
  DataSize -= FIRST_RECORD_OFFSET;
  
  /* If too many data to write return error */
  if( DataSize > NDEF_MAX_SIZE )
  {
    return NDEF_ERROR_MEMORY_INTERNAL;
  }
  
  /* Detect NDEF message in memory */
  if( NfcType5_NDEFDetection( ) != NDEF_OK )
  {
    return NDEF_ERROR;
  }
  
  /* Extract NDEF Size from buffer */
  NDEF_Size = (uint16_t)(pData[0] << 8);
  NDEF_Size = NDEF_Size | (uint16_t)(pData[1] );
  
  /* If entire NDEF is written, update Length of Type 5 */
  if( DataSize == NDEF_Size )
  {
    /* Check if L is on 3 or 1 byte */
    if( NDEF_Size >= NFCT5_3_BYTES_L_TLV )
    {
      /* First init L with 0, will be updated at the end */
      atlv[1] = 0x00;
      atlv[2] = 0x00;
      atlv[3] = 0x00;
      
      status = NFCTAG_WriteData( (atlv + 1), (CCFileStruct.NDEF_offset + 1), 3 );
      
      index += 4; 
    }
    else
    {
      /* First inti L with 0, will be updated at the end */
      atlv[1] = 0x00;
      
      status = NFCTAG_WriteData( (atlv + 1), (CCFileStruct.NDEF_offset + 1), 1 );
      
      index += 2;
    }
  }
  
  /* Start write NDEF message to EEPROM */
  status = NFCTAG_WriteData( (pData + FIRST_RECORD_OFFSET), CCFileStruct.NDEF_offset + index + Offset, DataSize );
  if( status != NFCTAG_OK )
  {
    return NDEF_ERROR;
  }
  
  /* If entire NDEF is written, update Length of Type 5 */
  if( DataSize == NDEF_Size )
  {
    /* Check if L is on 3 or 1 byte */
    if( NDEF_Size >= NFCT5_3_BYTES_L_TLV )
    {
      /* Update Length value */
      atlv[1] = NFCT5_3_BYTES_L_TLV;
      atlv[2] = pData[0];
      atlv[3] = pData[1];
      
      status = NFCTAG_WriteData( (atlv + 1), (CCFileStruct.NDEF_offset + 1), 3 );
    }
    else
    {
      /* Update Length value */
      atlv[1] = pData[1];
      
      status = NFCTAG_WriteData( (atlv + 1), (CCFileStruct.NDEF_offset + 1), 1 );
    }

    /* Write Terminator TLV */
    atlv[0] = NFCT5_TERMINATOR_TLV;
    status = NFCTAG_WriteData( atlv, CCFileStruct.NDEF_offset + index + NDEF_Size, 1 );
  }
  
  return NDEF_OK;
}

/**
  * @brief  This functions writes CCFile in EEPROM.
  * @Param  pCCBuffer : pointer on the buffer containnig CC file.
  * @retval NFCTAG status.
  */
uint16_t NFCType5::NfcType5_WriteCCFile( const uint8_t * const pCCBuffer )
{
  NFCTAG_StatusTypeDef ret_value;
  
  /* Write first block of CCFile */
  ret_value = NFCTAG_WriteData( pCCBuffer, 0x00, 0x4 );
 
  /* If extended memory writes the next 4 bytes */
  if( (pCCBuffer[2] == 0x00) && (ret_value == NFCTAG_OK) )
  {
    ret_value = NFCTAG_WriteData( pCCBuffer + 4, 0x04, 4 );
  }

  if( ret_value != NFCTAG_OK )
  {
    return NDEF_ERROR;
  }
  
    return NDEF_OK;
}

/**
  * @brief  This functions reads CCFile in EEPROM.
  * @Param  pCCBuffer : pointer on the buffer to store CC file.
  * @retval NFCTAG status.
  */
uint16_t NFCType5::NfcType5_ReadCCFile( uint8_t * const pCCBuffer )
{
  NFCTAG_StatusTypeDef ret_value;
  
  /* Read 4 bytes of CC File */
  ret_value = NFCTAG_ReadData( pCCBuffer, 0x00, 4 );

  /* If extended memory reads the next 4 bytes */
  if( (pCCBuffer[2] == 0x00) && (ret_value == NFCTAG_OK) )
  {
    ret_value = NFCTAG_ReadData( pCCBuffer + 4, 0x04, 4 );
  }
  
  if( ret_value != NFCTAG_OK )
  {
    return NDEF_ERROR;
  }
  
    return NDEF_OK;
}

/**
  * @brief  This function initialize memory in Tag Type 5.
  * @retval NFCTAG status.
  */
uint16_t NFCType5::NfcType5_TT5Init( void )
{
  NFCTAG_StatusTypeDef ret_value = NFCTAG_OK;
  uint16_t status;
  uint8_t accbuffer[8];
  uint8_t cdata;

  /* Prepare buffer to update CCFile */
  accbuffer[0] = CCFileStruct.MagicNumber;
  accbuffer[1] = CCFileStruct.Version;
  accbuffer[2] = CCFileStruct.MemorySize;
  accbuffer[3] = CCFileStruct.TT5Tag;
  CCFileStruct.NDEF_offset = 0x04;
  
  /* If extended memory prepare the length bytes */
  if( CCFileStruct.MemorySize == NFCT5_EXTENDED_CCFILE )
  {
    accbuffer[6] = (uint8_t)(CCFileStruct.ExtMemorySize >> 8);
    accbuffer[7] = (uint8_t)(CCFileStruct.ExtMemorySize & 0xFF);
    CCFileStruct.NDEF_offset = 0x08;
  }
  
  /* Update CCFile */
  status = NfcType5_WriteCCFile( accbuffer );
  if( status != NDEF_OK )
  {
    return status;
  }
  
  /* Update NDEF TLV for INITIALIZED state */
  /* Update T */
  cdata = NFCT5_NDEF_MSG_TLV;
  ret_value = NFCTAG_WriteData( &cdata, CCFileStruct.NDEF_offset, 1 );
  if( ret_value != NFCTAG_OK )
  {
    return NDEF_ERROR;
  }

  /* Update L */
  cdata = 0x00;
  ret_value = NFCTAG_WriteData( &cdata, (CCFileStruct.NDEF_offset + 1), 1 );
  if( ret_value != NFCTAG_OK )
  {
    return NDEF_ERROR;
  }
  
  return NDEF_OK;
}

/**
  * @brief  This function detects an NDEF message Tag Type 5 in EEPROM.
  * @retval NDEF_OK : NDEF message Tag Type 5 detected.
  * @retval NDEF_ERROR_NOT_FORMATED : Device is not an NFC Tag Type 5 Tag.
  * @retval NDEF_NO_NDEF_DETECTED : No NDEF Detected.
  */
uint16_t NFCType5::NfcType5_NDEFDetection( void )
{
  uint8_t acc_buffer[8];
  uint8_t atlv_detect[4];
  uint16_t status;
  uint32_t memory_size;
  
  CCFileStruct.State = TT5_NO_NDEF;
  
  /* Read CCFile */
  status = NfcType5_ReadCCFile( acc_buffer );
  if( status != NDEF_OK )
  {
    return status;
  }
  
  /* Check Byte 0 is equal to magic number */
  if( ( acc_buffer[0] != NFCT5_MAGICNUMBER_E1_CCFILE ) && ( acc_buffer[0] != NFCT5_MAGICNUMBER_E2_CCFILE ) )
  {
    return NDEF_ERROR_NOT_FORMATED;
  }
  /* Check Version number */
  else if( ( (acc_buffer[1]&0xFC) != 0x40 ) )
  {
    return NDEF_ERROR_NOT_FORMATED;
  }
  
  /* Check if CCFile is on 4 Bytes or 8 Bytes */
  if( acc_buffer[2] == 0x00 )
  {
    /* Update CCFIle structure */
    CCFileStruct.MemorySize = 0x0;
    CCFileStruct.ExtMemorySize = (uint16_t)acc_buffer[6];
    CCFileStruct.ExtMemorySize = ( CCFileStruct.ExtMemorySize << 8 ) |  acc_buffer[7];
    memory_size = CCFileStruct.ExtMemorySize;
    CCFileStruct.NDEF_offset = 8;
  }
  else
  {
    /* Update CCFIle structure */
    CCFileStruct.MemorySize = acc_buffer[2];
    CCFileStruct.ExtMemorySize = 0x0;
    memory_size = CCFileStruct.MemorySize;
    CCFileStruct.NDEF_offset = 4;
  }
  
  /* Update CCFIle structure */
  CCFileStruct.MagicNumber = acc_buffer[0];
  CCFileStruct.Version = acc_buffer[1];
  CCFileStruct.TT5Tag = acc_buffer[3];
  
  /* Search for position of NDEF TLV in memory and tag status */
  while( ( NFCTAG_ReadData( atlv_detect, CCFileStruct.NDEF_offset, 4 ) == NFCTAG_OK ) && ( CCFileStruct.NDEF_offset < memory_size ) )
  {
    /* Detect first NDEF Message in memory */
    if( atlv_detect[0] == NFCT5_NDEF_MSG_TLV )
    {
      if( atlv_detect[1] == 0x00 )
      {
        CCFileStruct.State = TT5_INITIALIZED;
      }
      else
      {
        if( CCFileStruct.Version & 0x3 )
        {
          CCFileStruct.State = TT5_READ;
        }
        else
        {
          CCFileStruct.State = TT5_READ_WRITE;
        }
      }
      return NDEF_OK;
    }
    /* If Proprietary NDEF jump to end of proprietary message */
    else if( atlv_detect[0] == NFCT5_PROPRIETARY_TLV )
    {
      if( atlv_detect[1] == NFCT5_3_BYTES_L_TLV )
      {
        CCFileStruct.NDEF_offset = CCFileStruct.NDEF_offset + ( (uint32_t)atlv_detect[2] << 8 ) + atlv_detect[3];
        continue;
      }
      else
      {
        CCFileStruct.NDEF_offset = CCFileStruct.NDEF_offset + atlv_detect[1];
        continue;
      }
    }
    /* if Terminator no NDEF detected */
    else if( atlv_detect[0] == NFCT5_TERMINATOR_TLV )
    {
      return NDEF_ERROR_NOT_FORMATED;
    }
      
    CCFileStruct.NDEF_offset++;
  }
  
  return NDEF_ERROR_NOT_FORMATED;
}

/**
  * @}
  */ 

/**
  * @}
  */ 

/**
  * @}
  */ 

/******************* (C) COPYRIGHT 2016 STMicroelectronics *****END OF FILE****/