www.pudn.com > ucos+net.zip > serial.h
#define TXR 0 /* Transmit register (WRITE) */
#define RXR 0 /* Receive register (READ) */
#define IER 1 /* Interrupt Enable */
#define IIR 2 /* Interrupt ID */
#define LCR 3 /* Line control */
#define MCR 4 /* Modem control */
#define LSR 5 /* Line Status */
#define MSR 6 /* Modem Status */
#define DLL 0 /* Divisor Latch Low */
#define DLH 1 /* Divisor latch High */
/*------------------------------------------------------------------*
Bit values held in the Interrupt Enable Register (IER).
bit meaning
--- -------
0 Interrupt when data received.
1 Interrupt when transmitter holding reg. empty.
2 Interrupt when data reception error.
3 Interrupt when change in modem status register.
4-7 Not used.
*------------------------------------------------------------------*/
#define IER_RX_DATA 0x01
#define IER_THRE 0x02
/*------------------------------------------------------------------*
Bit values held in the Interrupt Identification Register (IIR).
bit meaning
--- -------
0 Interrupt pending
1-2 Interrupt ID code
00=Change in modem status register,
01=Transmitter holding register empty,
10=Data received,
11=reception error, or break encountered.
3-7 Not used.
*------------------------------------------------------------------*/
#define IIR_INT_BITMASK 0x06
#define IIR_MODEM_STATUS 0x00
#define IIR_TX_ID 0x01
#define IIR_RX_ID 0x04
#define IIR_LINE_STATUS 0x06
/*-------------------------------------------------------------------*
Bit values held in the Line Control Register (LCR).
bit meaning
--- -------
0-1 00=5 bits, 01=6 bits, 10=7 bits, 11=8 bits.
2 Stop bits.
3 0=parity off, 1=parity on.
4 0=parity odd, 1=parity even.
5 Sticky parity.
6 Set break.
7 Toggle port addresses.
*-------------------------------------------------------------------*/
#define LCR_DATA_BITMASK 0x03
#define LCR_5_DATA_BITS 0x00
#define LCR_6_DATA_BITS 0x01
#define LCR_7_DATA_BITS 0x02
#define LCR_8_DATA_BITS 0x03
#define LCR_2_STOP 0x04
#define LCR_PARITY 0x08
#define LCR_PARITY_EVEN 0x10
#define LCR_DLAB 0x80
/*-------------------------------------------------------------------*
Bit values held in the Modem Output Control Register (MCR).
bit meaning
--- -------
0 Data Terminal Ready. Computer ready to go.
1 Request To Send. Computer wants to send data.
2 auxillary output #1.
3 auxillary output #2.(Note: This bit must be
set to allow the communications card to send
interrupts to the system)
4 UART ouput looped back as input.
5-7 not used.
*------------------------------------------------------------------*/
#define MCR_DTR 0x01
#define MCR_RTS 0x02
#define MCR_OUT1 0x04
#define MCR_OUT2 0x08
#define MCR_INT 0x08
/*-------------------------------------------------------------------*
Bit values held in the Line Status Register (LSR).
bit meaning
--- -------
0 Data ready.
1 Overrun error - Data register overwritten.
2 Parity error - bad transmission.
3 Framing error - No stop bit was found.
4 Break detect - End to transmission requested.
5 Transmitter holding register is empty.
6 Transmitter shift register is empty.
7 Time out - off line.
*-------------------------------------------------------------------*/
#define LSR_RCVRDY 0x01
#define LSR_OVRERR 0x02
#define LSR_PRTYERR 0x04
#define LSR_FRMERR 0x08
#define LSR_BRKERR 0x10
#define LSR_XMTRDY 0x20
#define LSR_XMTRSR 0x40
#define LSR_TIMEOUT 0x80
/*------------------------------------------------------------------*
Bit values held in the Modem Input Status Register (MSR).
bit meaning
--- -------
0 delta Clear To Send.
1 delta Data Set Ready.
2 delta Ring Indicator.
3 delta Data Carrier Detect.
4 Clear To Send.
5 Data Set Ready.
6 Ring Indicator.
7 Data Carrier Detect.
*------------------------------------------------------------------*/
#define MSR_CTS 0x10
#define MSR_DSR 0x20
//////////////////////////////////////////////////////////////////////
/*
* This structure defines the 256 byte buffer used for
* I/O buffers by the SERIAL routines. By using a buffer
* size of 256 bytes, updating the indices is simplified.
*/
typedef struct {
char buffer[256];
unsigned char write_index;
unsigned char read_index;
} BUFFER;
/*
* This structure defines a SERIAL port. It is initialized
* when the port is opened with port_open().
*/
typedef struct {
int uart_base;
int irq_mask;
int interrupt_number;
BUFFER in;
} PORT ;
/*
* The fully qualified function prototypes. All of these
* routines actually reside in SERIAL.C
*/
PORT *port_open( int address, int interrupt_number );
void port_set( PORT *port,
long speed,
char parity,
int data,
int stopbits );
int port_putc( unsigned char c, PORT *port );
int port_getc( PORT *port );
/*
* These are the standard UART addresses and interrupt
* numbers for the two IBM serialpatible SERIAL ports.
*/
#define SERIAL1_UART 0x3f8
#define SERIAL1_INTERRUPT 4
#define SERIAL_PORT_1 0
#define SERIAL2_UART 0x2f8
#define SERIAL2_INTERRUPT 3
#define SERIAL_PORT_2 1
#define SERIAL_NOECHO 1
#define SERIAL_ECHOP 2
#define SERIAL_ECHOC 3
extern void OSport_init(void);
extern int OSport_getc(int portnum,unsigned char flag);
extern int OSport_gets(int portnum,unsigned char *buf,int max_input);
extern int OSport_putc(int portnum,unsigned char ch);
extern int OSport_puts(int portnum,unsigned char *buf,int len);