Lpc2000

Hi,

I have the following code to add extended IDs in the acceptance filter but I
can't get it to work.
May somebody help me to find the problem ?
Or anybody has some code that I could use to get it work ?

Best regards

David Mercier

int16_t canSetFilter (uint16_t canPort, uint32_t canID)
{
  uint16_t p, n;
  uint32_t buf0, buf1;
  uint32_t *pAddr;

  AFMR = AF_ACCEPT_ALL; // Allow modif on Acceptance Filter

  if (mCANFilter >= MAX_FILTERS)
  {
    return 0;
  }

  // Filters must be sorted by interface, then by priority
  canID &=   0x1FFFFFFFL; // Mask out 29-bit ID
  canID |= (canPort << 29); // Put can_port info in bits 29, 30, 31

  // new filter is sorted into array
  p = 0;
  while (p < mCANFilter) // loop through all existing filters
  {
    // If ID at position p is bigger than the one we need to insert
    if ((mCANFilterList[p].MsgID) > canID)
    {
      break;
    }
    p++;
  }

  // move all remaining entries one row up
  for(n = mCANFilter; n > p; n--)
  {
    mCANFilterList[n].MsgID = mCANFilterList[n-1].MsgID;
  }

  // insert new filter here
  buf0 = mCANFilterList[p].MsgID; // save current entry
  mCANFilterList[p].MsgID = canID; // insert the new entry

  // move all remaining entries one row up
  mCANFilter++;
  while (p < mCANFilter)
  {
    p++;
    buf1 = mCANFilterList[p].MsgID;
    mCANFilterList[p].MsgID = buf0;
    buf0 = buf1;
  }

  // Now work on Acceptance Filter Configuration
  // Set CAN filter for 29-bit extended identifiers
  p = 0;

  // Set pointer for Standard Frame Individual
  // Standard Frame Explicit
  SFF_sa = p;

  // Set pointer for Standard Frame Groups
  // Standard Frame Group Start Address Register
  SFF_GRP_sa = p;

  // Set pointer for Extended Frame Individual
  // Extended Frame Start Address Register
  EFF_sa = p;

  pAddr = (uint32_t *)&AFRAM;

  for (n = 0; n < mCANFilter; n++)
  {
    *pAddr = mCANFilterList[n].MsgID;
    p += 4;
    pAddr++;
  }

  // p is still pointing to end of table;
  // last entry must contain unused filters
  *pAddr = 0xF7FFF7FF;
  p += 4;

  // Set pointer for Extended Frame Groups
  // Extended Frame Group Start Address Register
  EFF_GRP_sa = p;

  // Set ENDofTable
  // End of AF Tables Register
  ENDofTable = p;

  // Acceptance Filter Mode Register, start using filter
  AFMR = AF_ON;

  return 1;
}


[Non-text portions of this message have been removed]

> I have the following code to add extended IDs in the acceptance filter but
> I can't get it to work.

What are the values of AF_ACCEPT_ALL and AF_ON in your code?


Joel

Sorry about that !

// Acceptance Filter
#define AF_ON               0
#define AF_OFF              1
#define AF_ACCEPT_ALL       2



On 3/14/06, Joel Winarske <joelw@...> wrote:
>
>  > I have the following code to add extended IDs in the acceptance filter
> but
> > I can't get it to work.
>
> What are the values of AF_ACCEPT_ALL and AF_ON in your code?
>
>
> Joel
>
>
>
>
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[Non-text portions of this message have been removed]