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Length: 1760 (0x6e0)
Types: TextFile
Notes: UNIX file
Names: »rs.h«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/include/sys/rs.h«
/*
* @(#)rs.h 1.2 7/14/83
* @(#)Copyright (C) 1983 by National Semiconductor Corp.
*/
/*************************************************************************
** **
** Signetics 2651 serial io device **
** **
**************************************************************************/
struct dev2651 { /* 2651 serial io device */
u_short data;
u_short status;
u_short mode;
u_short cmd;
};
#define RSDEV struct dev2651
/*
* Mode and command bits
*/
/* Mode register 1 bit definitions */
#define X01 0x1 /* 01x clock rate */
#define X16 0x2 /* 16x clock rate */
#define X64 0x3 /* 64x clock rate */
#define BITS8 0xc /* 8 bits per char*/
#define BITS7 0x8 /* 7 bits per char*/
#define PENABLE 0x10 /* parity enable */
#define EPAR 0x20 /* even parity */
#define STOP1 0x40 /* 1 stop bit */
#define STOP2 0xc0 /* 2 stop bits */
#define MODE1 X16 | BITS8 | STOP1 & ~PENABLE
#define MODE2 0 /* external clocking */
/* Command register bit definitions */
#define TxEN 0x1 /* transmitter enable */
#define DTR 0x2 /* assert data terminal ready */
#define RxEN 0x4 /* receiver enable */
#define BRK 0x8 /* force a "break" */
#define ERESET 0x10 /* reset error flags */
#define RTS 0x20 /* assert request to send */
#define CMD TxEN | DTR | RxEN | ERESET | RTS /* default command reg */
/* Status register bit definitions */
#define TxRDY 0x1 /* transmitter ready */
#define RxRDY 0x2 /* receiver ready */
#define TxEMT 0x4 /* transmitter empty/dschng */
#define PE 0x8 /* parity error */
#define OE 0x10 /* overrun error */
#define FE 0x20 /* framing error */
#define DCD 0x40 /* data carrier detect */
#define DSR 0x80 /* data set ready */
#define ERROR PE | OE | FE /* error bit mask */