CP_GET_ERROR CP_GET_NODATA CP_GET_SUCCESS CpDoesPortExist CpEnableFifo CpGetByte CpInitialize CPPORT_FLAG_MODEM_CONTROL CpPutByte CpReadLsr CpSetBaud

UCHAR NTAPI CpReadLsr ( IN PCPPORT  Port, IN UCHAR  ExpectedValue  ) Definition at line 114 of file cport.c. Referenced by CpGetByte(), and CpPutByte(). { UCHAR Lsr, Msr; /* Read the LSR and check if the expected value is present */ Lsr = READ_PORT_UCHAR(Port->Address + LINE_STATUS_REGISTER); if (!(Lsr & ExpectedValue)) { /* Check the MSR for ring indicator toggle */ Msr = READ_PORT_UCHAR(Port->Address + MODEM_STATUS_REGISTER); /* If the indicator reaches 3, we've seen this on/off twice */ RingIndicator |= (Msr & SERIAL_MSR_RI) ? 1 : 2; if (RingIndicator == 3) Port->Flags |= CPPORT_FLAG_MODEM_CONTROL; } return Lsr; }