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//*****************************************************************************
//
// tlv.c - Driver for the tlv Module.
//
//*****************************************************************************

//*****************************************************************************
//
//! \addtogroup tlv_api tlv
//! @{
//
//*****************************************************************************

#include "inc/hw_memmap.h"

#ifdef __MSP430_HAS_TLV__
#include "tlv.h"

#include <assert.h>

void TLV_getInfo(uint8_t tag,
                 uint8_t instance,
                 uint8_t *length,
                 uint16_t **data_address
                 )
{
  // TLV Structure Start Address
  char *TLV_address = (char *)TLV_START;

  while((TLV_address < (char *)TLV_END)
        && ((*TLV_address != tag) || instance)   // check for tag and instance
        && (*TLV_address != TLV_TAGEND))         // do range check first
  {
    if (*TLV_address == tag)
    {
      // repeat till requested instance is reached
      instance--;
    }
    // add (Current TAG address + LENGTH) + 2
    TLV_address += *(TLV_address + 1) + 2;
  }

  // Check if Tag match happened..
  if (*TLV_address == tag)
  {
    // Return length = Address + 1
    *length = *(TLV_address + 1);
    // Return address of first data/value info = Address + 2
    *data_address = (uint16_t *)(TLV_address + 2);
  }
  // If there was no tag match and the end of TLV structure was reached..
  else
  {
    // Return 0 for TAG not found
    *length = 0;
    // Return 0 for TAG not found
    *data_address = 0;
  }
}

uint16_t TLV_getDeviceType()
{
  uint16_t *pDeviceType = (uint16_t *)TLV_DEVICE_ID_0;
  // Return Value from TLV Table
  return pDeviceType[0];
}

uint16_t TLV_getMemory(uint8_t instance)
{
    uint8_t *pPDTAG;
    uint8_t bPDTAG_bytes;
    uint16_t count;

    // set tag for word access comparison
    instance *= 2;

    // TLV access Function Call
    // Get Peripheral data pointer
    TLV_getInfo(TLV_PDTAG,
                0,
                &bPDTAG_bytes,
                (uint16_t **)&pPDTAG
                );

    for (count = 0;count <= instance; count += 2)
    {
      if (pPDTAG[count] == 0)
      {
         // Return 0 if end reached
        return 0;
      }
      if (count == instance)
        return (pPDTAG[count] | pPDTAG[count+1]<<8);
    }

    // Return 0: not found
    return 0;
}

uint16_t TLV_getPeripheral(uint8_t tag,
                               uint8_t instance
                              )
{
    uint8_t *pPDTAG;
    uint8_t bPDTAG_bytes;
    uint16_t count = 0;
    uint16_t pcount = 0;

    // Get Peripheral data pointer
    TLV_getInfo(TLV_PDTAG,
                0,
                &bPDTAG_bytes,
                (uint16_t **)&pPDTAG
                );

    // read memory configuration from TLV to get offset for Peripherals
    while (TLV_getMemory(count))
    {
      count++;
    }
    // get number of Peripheral entries
    pcount = pPDTAG[count * 2 + 1];
    // inc count to first Periperal
    count++;
    // adjust point to first address of Peripheral
    pPDTAG += count*2;
    // set counter back to 0
    count = 0;
    // align pcount for work comparision
    pcount *= 2;

    // TLV access Function Call
    for (count = 0; count <= pcount; count += 2)
    {
      if (pPDTAG[count+1] == tag)
      {
        // test if required Peripheral is found
        if (instance > 0)
        {
          // test if required instance is found
          instance--;
        }
        else
        {
          // Return found data
          return (pPDTAG[count] | pPDTAG[count + 1] << 8);
        }
      }
    }

    // Return 0: not found
    return 0;
}

uint8_t TLV_getInterrupt(uint8_t tag)
{
    uint8_t *pPDTAG;
    uint8_t bPDTAG_bytes;
    uint16_t count = 0;
    uint16_t pcount = 0;

    // Get Peripheral data pointer
    TLV_getInfo(TLV_PDTAG,
                0,
                &bPDTAG_bytes,
                (uint16_t **)&pPDTAG
                );

    // read memory configuration from TLV to get offset for Peripherals
    while (TLV_getMemory(count))
    {
      count++;
    }

    pcount = pPDTAG[count * 2 + 1];
    // inc count to first Periperal
    count++;
    // adjust point to first address of Peripheral
    pPDTAG += (pcount + count) * 2;
    // set counter back to 0
    count = 0;

    // TLV access Function Call
    for (count = 0; count <= tag; count += 2)
    {
      if (pPDTAG[count] == 0)
      {
        // Return 0: not found/end of table
        return 0;
      }
      if (count == tag)
      {
        // Return found data
        return (pPDTAG[count]);
      }
    }

    // Return 0: not found
    return 0;
}

#endif
//*****************************************************************************
//
//! Close the doxygen group for tlv_api
//! @}
//
//*****************************************************************************
