OneStopBit
case OneStopBit:
port->stopbits = OneStopBit;
port->stopbits = OneStopBit;
sp->stopbits = (lcr & STOP2) == STOP2? TwoStopBits:OneStopBit;
case OneStopBit:
stopbits = OneStopBit;
case OneStopBit:
int stopbits = OneStopBit;
case '1': stopbits = OneStopBit;