MPC565 Queued SCI receive problem

Dear group,

I have been using the MPC565?s QSCI receive queue successfully for some 
time.
I run at 115,200 baud. Recently I have come across a situation that causes 
it to fail. 
If a packet of characters contains at least one intercharacter delay of 
just over one 
character time the idle interrupt occurs just prior to the next receive 
character arrival.
When executing the idle ISR the queue is cleared with this received 
character. 
Does anyone have any idea how I can fix this problem?  My code is as 
follows:

void imb_IRQ1_ISR (void)
{ /* SCI_A interrupts (Com1,Com2) */
  U16 status;
  U08 sciData,i;

//Com1
  status = QSMCM_A.SC1SR.R; /* check Com1 QSMCM 'A' SCI 1 */
  if(QSMCM_A.QSCI1SR.B.QTHF)
  {
    QSMCM_A.QSCI1SR.B.QTHF = 0; /* clear QTHF bit */
    for(i = 0; i < 8; i++)
    {
      RxCount1++;
      enquei(Com1RxQ, (U08)QSMCM_A.SCRQ[i].R);
    }
    Com1QueRxNextFramePointer = 8;
  }
  if(QSMCM_A.QSCI1SR.B.QBHF)
  {
    QSMCM_A.QSCI1SR.B.QBHF = 0; /* clear QBHF bit */
    for(i = 8; i < 16; i++)
    {
      RxCount1++;
      enquei(Com1RxQ, (U08)QSMCM_A.SCRQ[i].R);
    }
    Com1QueRxNextFramePointer = 0;
  }
  if(QSMCM_A.SC1SR.B.IDLE)
  {
    for(i = Com1QueRxNextFramePointer; i < QSMCM_A.QSCI1SR.B.QRPNT; i++)
    {
      RxCount1++;
      enquei(Com1RxQ, (U08)QSMCM_A.SCRQ[i].R);
    }
    for(i=0; i<16; i++) /* clear IDLE bit */
      sciData = QSMCM_A.SCRQ[i].R;
    QSMCM_A.QSCI1CR.B.QRE = 0;  /* Clear then Set QRE to reset QRPNT */
    QSMCM_A.QSCI1CR.B.QRE = 1;
    Com1QueRxNextFramePointer = 0;
  }
  if (status&0x000F)
  {
    ComErrors[0] |= status&0x000F;
    sciData = (char)QSMCM_A.SC1DR.R; /* clear status register */
    RxErrorCount1++;
  }
}

Best Regards,


Peter Santariello
Software Engineer
INFICON
2 Technology Place
East Syracuse, NY 13057
+1.315.434.1150    (voice)
+1.315.434.1273    (fax)
[email protected] (e-mail)
http://www.inficon.com


***********************************************************************
NOTICE: - This message including any attachments is intended only for the 
use of the designated recipient(s) named above and may contain 
confidential information protected by law.  If you are not the intended 
recipient, you are hereby notified that any disclosure, copying, 
distribution, or the taking of any action in reliance on the contents of 
this information is strictly prohibited.  If you have received this 
transmission in error, please notify the sender immediately by e-mail and 
delete the original message including any attachments.
*********************************************************************** 


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



-----------------------------------------------------------
To learn more about Freescale Microcontrollers, please visit
http://www.freescale.com/mcu


 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/MPC500/

<*> To unsubscribe from this group, send an email to:
    [email protected]

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/