Category : Files from Magazines
Archive   : DDJSRC.ZIP
Filename : SERIAL.H

/* ---------- serial.h ---------------
* Serial Port Definitions
*/
extern int ticker, COMPORT;
extern char *nextin, *nextout;
/* ----------- serial prototypes ----------- */
void initcomport(void);
int readcomm(void);
int writecomm(int);
void clear_serial_queue(void);
/* -------- timer prototypes --------- */
void sleep(unsigned);
int set_timer(unsigned);
void intercept_timer(void);
void restore_timer(void);
void restore_serialint(void);
/* ----------------- macros ------------------- */
#define comstat() (inp(LINESTATUS))
#define input_char_ready() (nextin!=nextout)
#define timed_out() (ticker==0)
#define set_timer(secs) ticker=secs*182/10+1
#define XON 17
#define XOFF 19
/* ---------------- serial port addresses ----------------- */
/* - 8250 UART base port address: COM1 = 3f8, COM2 = 2f8 - */
#define BASEPORT (0x3f8-((COMPORT-1)<<8))
#define TXDATA BASEPORT /* transmit data */
#define RXDATA BASEPORT /* receive data */
#define DIVLSB BASEPORT /* baud rate divisor lsb */
#define DIVMSB (BASEPORT+1) /* baud rate divisor msb */
#define INTENABLE (BASEPORT+1) /* interrupt enable */
#define INTIDENT (BASEPORT+2) /* interrupt ident'n */
#define LINECTL (BASEPORT+3) /* line control */
#define MODEMCTL (BASEPORT+4) /* modem control */
#define LINESTATUS (BASEPORT+5) /* line status */
#define MODEMSTATUS (BASEPORT+6) /* modem status */
/* --------------- serial interrupt stuff ------------------ */
#define IRQ (4-(COMPORT-1)) /* 0-7 = IRQ0-IRQ7 */
#define COMINT (12-(COMPORT-1)) /* interrupt vector 12/11*/
#define COMIRQ (~(1 << IRQ))
#define PIC01 0x21 /*8259 Programmable Interrupt Controller*/
#define PIC00 0x20 /* " " " " */
#define EOI 0x20 /* End of Interrupt command */
#define TIMER 0x1c /* PC timer interrupt vector */
/* --------------- line status register values ------------- */
#define XMIT_DATA_READY 0x20
/* ------------ modem control register values -------------- */
#define DTR 1
#define RTS 2
#define OUT2 8
/* ----------- interrupt enable register signals ------------ */
#define DATAREADY 1
/* ------------- serial input interrupt buffer -------------- */
#define BUFSIZE 1024
#define SAFETYLEVEL (BUFSIZE/4)
#define THRESHOLD (SAFETYLEVEL*3)
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif