Communicating dsPIC with PC application through UART. Receiver interrupt handling -


i'm communicating c# applications dspic x16 microcontroller using uart. want send/receive fixed size frames , tried manage in following way:

if(readframe)     {   iec0bits.u1rxie=0; //turn off u1rx interrupts         readframe = false;                     while(indexer < 8 )         {                while(!u1stabits.urxda);                 modbusbuffer[indexer]=u1rxreg;                 indexer++;         }         if(indexer == 8)         {             modbusrecvtask(modbusbuffer);             indexer=0;         }                               iec0bits.u1rxie=1;     //turn on u1rx interrupts            }  void _isr_nap _u1rxinterrupt() {     if(ifs0bits.u1rxif) {     ifs0bits.u1rxif = 0;    //set interrupt flag false     if(u1stabits.oerr==1)   //check overload error     {         u1stabits.oerr=0;       //clear error flag     }     else     {         readframe = true;             } }

}

the thing works fine first received frame. after program goes receiver interrupt again , sets flag readframe true though no bytes send , getting stuck in line:

while(!u1stabits.urxda);

i've read advices clear read buffer of uart in order prevent program go isr again couldn't find way it.


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