double Rx interrupts on HCS08QG SCI

[TonvW]

I have used the SCI intterface before and with succes but now it's nothing but trouble.

I'm expecting to receive 8 bytes, but every byte is received twice!

(when 'ABCDEFGH' is sent, 'AABBCCDD' is received.

Please give me some advise. I'm using the interrupt routine below:

__interrupt void isrVscirx(void)

{

   RxBuf[RcvCount] = SCID;    // store in buffer

   RcvCount++;

   if (RcvCount==RXMAXBYTES) {    

     AsuroDataValid = TRUE;       

     RcvCount =0;                 

     SCIC2_RE =0;

     SCIC2_RIE =0;        

   }

   (void) SCIS1;      // reset flag

}

Thank you.

[tonyp · Accepted solution]

I believe before you read the SCID register, you must read the SCIS1 register.  This is part of the flag clearing mechanism.  (Simply make the last statement first.)

[TonvW]

Thank you very much for your reply! 

it works fine this way.