Cannot set CANBSEL to CANTFLG on MC9S12G128

[ilya_r]

I am trying to send a CAN message but in the debugger the following lines of code are skipped:

do {

    CANTBSEL = CANTFLG;

  }while(!CANTBSEL);

here is the full function:

void CANMsgTX(J1939_MSG *MsgTX)
{
  volatile byte txbuffer;
  while(!CANTFLG)

 
  do  {
    CANTBSEL = CANTFLG;
  }while(!CANTBSEL);

    
  txbuffer = CANTBSEL;

  LoadMsgTX(MsgTX);

  CANTFLG = txbuffer;
}

thus CANBSEL and txbuffer stay at 0

[ilya_r · Accepted solution]

Fixewd the issue:

the following line:

while(!CANTFLG) 

did not have {} after and thus the line following was never called.