//
//  _8250.H
//
//  Source code from:
//
//  Serial Communications: A C++ Developer's Guide, 2nd Edition
//  by Mark Nelson, IDG Books, 1999
//
//  Please see the book for information on usage.
//

#ifndef __8250_DOT_H
#define __8250_DOT_H

//
// These are the definitions for the 8250 and 16550 UART
// registers.  They are used in both the ISR and the main
// class functions.
//

const int TRANSMIT_HOLDING_REGISTER           = 0x00;
const int RECEIVE_BUFFER_REGISTER             = 0x00;
const int INTERRUPT_ENABLE_REGISTER           = 0x01;
const int   IER_RX_DATA_READY                 = 0x01;
const int   IER_TX_HOLDING_REGISTER_EMPTY     = 0x02;
const int   IER_LINE_STATUS                   = 0x04;
const int   IER_MODEM_STATUS                  = 0x08;
const int INTERRUPT_ID_REGISTER               = 0x02;
const int   IIR_MODEM_STATUS_INTERRUPT        = 0x00;
const int   IIR_TX_HOLDING_REGISTER_INTERRUPT = 0x02;
const int   IIR_RX_DATA_READY_INTERRUPT       = 0x04;
const int   IIR_LINE_STATUS_INTERRUPT         = 0x06;
const int FIFO_CONTROL_REGISTER               = 0x02;
const int   FCR_FIFO_ENABLE                   = 0x01;
const int   FCR_RCVR_FIFO_RESET               = 0x02;
const int   FCR_XMIT_FIFO_RESET               = 0x04;
const int   FCR_RCVR_TRIGGER_LSB              = 0x40;
const int   FCR_RCVR_TRIGGER_MSB              = 0x80;
const int   FCR_TRIGGER_01                    = 0x00;
const int   FCR_TRIGGER_04                    = 0x40;
const int   FCR_TRIGGER_08                    = 0x80;
const int   FCR_TRIGGER_14                    = 0xc0;
const int LINE_CONTROL_REGISTER               = 0x03;
const int   LCR_WORD_LENGTH_MASK              = 0x03;
const int   LCR_WORD_LENGTH_SELECT_0          = 0x01;
const int   LCR_WORD_LENGTH_SELECT_1          = 0x02;
const int   LCR_STOP_BITS                     = 0x04;
const int   LCR_PARITY_MASK                   = 0x38;
const int   LCR_PARITY_ENABLE                 = 0x08;
const int   LCR_EVEN_PARITY_SELECT            = 0x10;
const int   LCR_STICK_PARITY                  = 0x20;
const int   LCR_SET_BREAK                     = 0x40;
const int   LCR_DLAB                          = 0x80;
const int MODEM_CONTROL_REGISTER              = 0x04;
const int   MCR_DTR                           = 0x01;
const int   MCR_RTS                           = 0x02;
const int   MCR_OUT1                          = 0x04;
const int   MCR_OUT2                          = 0x08;
const int   MCR_LOOPBACK                      = 0x10;
const int LINE_STATUS_REGISTER                = 0x05;
const int   LSR_DATA_READY                    = 0x01;
const int   LSR_OVERRUN_ERROR                 = 0x02;
const int   LSR_PARITY_ERROR                  = 0x04;
const int   LSR_FRAMING_ERROR                 = 0x08;
const int   LSR_BREAK_DETECT                  = 0x10;
const int   LSR_THRE                          = 0x20;
const int MODEM_STATUS_REGISTER               = 0x06;
const int   MSR_DELTA_CTS                     = 0x01;
const int   MSR_DELTA_DSR                     = 0x02;
const int   MSR_TERI                          = 0x04;
const int   MSR_DELTA_CD                      = 0x08;
const int   MSR_CTS                           = 0x10;
const int   MSR_DSR                           = 0x20;
const int   MSR_RI                            = 0x40;
const int   MSR_CD                            = 0x80;
const int DIVISOR_LATCH_LOW                   = 0x00;
const int DIVISOR_LATCH_HIGH                  = 0x01;


#endif // #ifndef _8250_DOT_H

// ************************ END OF _8250.H ***********************