1 /* serial.h - mostly useful for DUART serial_init in serial.c */
21 #define BDEFAULT B115200
23 /* this stuff is important to initialize
26 #define Scale 0x01L /* distance between port addresses */
27 #define COM1 0x000003f8 /* Keyboard */
28 #define COM2 0x000002f8 /* Host */
31 /* Port Definitions relative to base COM port addresses */
32 #define DataIn (0x00*Scale) /* data input port */
33 #define DataOut (0x00*Scale) /* data output port */
34 #define BaudLsb (0x00*Scale) /* baud rate divisor least significant byte */
35 #define BaudMsb (0x01*Scale) /* baud rate divisor most significant byte */
36 #define Ier (0x01*Scale) /* interrupt enable register */
37 #define Iir (0x02*Scale) /* interrupt identification register */
38 #define Lcr (0x03*Scale) /* line control register */
39 #define Mcr (0x04*Scale) /* modem control register */
40 #define Lsr (0x05*Scale) /* line status register */
41 #define Msr (0x06*Scale) /* modem status register */
43 /* Bit Definitions for above ports */
44 #define LcrDlab 0x80 /* b7: enable baud rate divisor registers */
45 #define LcrDflt 0x03 /* b6-0: no parity, 1 stop, 8 data */
47 #define McrRts 0x02 /* b1: request to send (I am ready to xmit) */
48 #define McrDtr 0x01 /* b0: data terminal ready (I am alive ready to rcv) */
49 #define McrDflt (McrRts|McrDtr)
51 #define LsrTxD 0x6000 /* b5: transmit holding register empty (i.e. xmit OK!)*/
52 /* b6: transmitter empty */
53 #define LsrRxD 0x0100 /* b0: received data ready (i.e. got a byte!) */
55 #define MsrRi 0x0040 /* b6: ring indicator (other guy is ready to rcv) */
56 #define MsrDsr 0x0020 /* b5: data set ready (other guy is alive ready to rcv */
57 #define MsrCts 0x0010 /* b4: clear to send (other guy is ready to rcv) */
59 #define IerRda 0xf /* b0: Enable received data available interrupt */
63 #endif /* __SERIAL_H__ */