?? pcl4c.ref
字號(hào):
Personal Communications Library
For the C Language
(PCL4C)
REFERENCE MANUAL
Version 4.0
Oct 18, 1993
This software is provided as-is.
There are no warranties, expressed or implied.
Copyright (C) 1993
All rights reserved
MarshallSoft Computing, Inc.
Post Office Box 4543
Huntsville AL 35815
Voice 205-881-4630
FAX 205-881-4630
BBS 205-880-9748
PCL4C Reference Manual Page 1
C O N T E N T S
Chapter Page
Table of Contents.............................2
Introduction..................................3
SioBaud....................................4
SioBrkKey..................................5
SioBrkSig..................................6
SioCrtWrite................................7
SioCTS.....................................8
SioDCD.....................................9
SioDelay..................................10
SioDone...................................11
SioDSR....................................12
SioDTR....................................13
SioError..................................14
SioFIFO...................................15
SioFlow...................................16
SioGetc...................................17
SioKeyPress...............................18
SioKeyRead................................19
SioInfo...................................20
SioIRQ....................................21
SioLine...................................22
SioLoopBack...............................23
SioModem..................................24
SioParms..................................25
SioPorts..................................26
SioPutc...................................27
SioRead...................................28
SioReset..................................29
SioRI.....................................30
SioRTS....................................31
SioRxBuf..................................32
SioRxFlush................................33
SioRxQue..................................34
SioTimer..................................35
SioTxBuf..................................36
SioTxFlush................................37
SioTxQue..................................38
SioUART...................................39
SioUnGetc.................................40
Function Summary.............................41
Error Code Summary...........................42
PCL4C Reference Manual Page 2
Introduction
This manual lists all of the PCL4C functions in alphabetical
order. Every library function will return a value as follows:
1. Negative values for error conditions. See last page of this
manual for a list of error values and their meanings.
2. Non-negative values when returning data (eg: SioLine).
3. Zero otherwise.
When debugging an application, be sure to test all return values.
Use SioError to print the associated text for errors.
Example Code Segment
*****************************************************************
* int Code; /* MUST be 'int', not 'char' */ *
* *
* Code = SioFunction( ); /* any PCL4C function */ *
* if(Code<0) *
* {/* error returned */ *
* SioError(Code); /* SioError prints error text */ *
* SioDone(Port); /* always call SioDone last */ *
* exit(1); *
* } *
* /* no errors */ *
* ...your application code... *
* *
*****************************************************************
For more examples, examine each of the example programs provided
(SIMPLE.C and TERM.C). Also look at the examples associated with
each library function described in the following section.
Also note that there are two versions of the library for each
memory model. One version is with transmitter interrupts disabled
and one with them enabled.
Refer to the User's Manual (PCL4C.USR) for addition information.
PCL4C Reference Manual Page 3
SioBaud
Function Sets the baud rate of the selected port.
Syntax int SioBaud(Port,BaudCode)
int Port; /* Port selected (COM1 - COM4) */
int BaudCode; /* Baud code */
Remarks The SioBaud function sets the baud rate without
resetting the port. It is used to change the baud rate
after calling SioReset.
Baud Code Baud Rate PCL4C.H Name
0 300 Baud300
1 600 Baud600
2 1200 Baud1200
3 2400 Baud2400
4 4800 Baud4800
5 9600 Baud9600
6 19200 Baud19200
7 38400 Baud38400
8 57600 Baud57600
9 115200 Baud115200
Returns -4 : No such port. Expect 0 to MaxPort.
-11 : Bad baud rate code. See above code values.
Example /* verify 2400 baud connection */
if(WaitFor(Port,"CONNECT") )
{/* expect "2400" */
if(WaitFor(Port,"2400")
{/* 2400 baud connection made */
...
}
}
See Also SioReset
PCL4C Reference Manual Page 4
SioBrkKey
Function Return non-zero if the Control-BREAK key was pressed.
Syntax int SioBrkKey()
Remarks The SioBrkKey function returns a TRUE value (non-
zero) if the Control-BREAK key was pressed, else it
returns a zero. Use SioBrkKey as a safety exit from a
polling loop. Don't mix this function up with
SioBrkSig.
Returns -1 : Control-BREAK was pressed.
0 : Control-BREAK was NOT pressed.
Example int c;
...
while(1)
{/* exit if user pressed Control-BREAK */
if(SioBrkKey())
{puts("User typed Contrl-BREAK");
SioDone(Port);
exit(1);
}
/* transmit any typed character */
if(SioKeyPress())
{c = SioKeyRead();
SioPutc(Port,c);
}
/* display any incoming character */
c = SioGetc(Port,0);
if(c!=-1) SioCrtWrite(c);
}
See Also SioBrkSig
PCL4C Reference Manual Page 5
SioBrkSig
Function Asserts, cancels, or detects BREAK signal.
Syntax int SioBrkSig(Port,Cmd)
int Port; /* Port selected (COM1 thru COM4) */
char Cmd; /* ASSERT, CANCEL, or DETECT */
Remarks The SioBrkSig function controls the BREAK bit in the
line status register. The legal commands are:
ASSERT_BREAK ('A') to assert BREAK
CANCEL_BREAK ('C') to cancel BREAK
DETECT_BREAK ('D') to detect BREAK
ASSERT_BREAK, CANCEL_BREAK, and DETECT_BREAK are
defined in PCL4C.H. See TERM.C for an example of the
use of SioBrkSig.
Returns -2 : Port not enabled. Call SioReset first.
-4 : No such port. Expect 0 to MaxPort.
-6 : Illegal command. Expected 'A', 'C', or 'D'.
>0 : BREAK signal detected (DETECT command only)
Example /* Assert BREAK for 1 second */
SioBrkSig(Port,ASSERT_BREAK);
SioDelay(18);
SioBrkSig(Port,CANCEL_BREAK);
/* Detect BREAK */
if(SioBrkSig(Port,DETECT_BREAK))
{puts("BREAK signal detected");
/* ...do some more stuff... */
}
See Also SioBrkKey
PCL4C Reference Manual Page 6
SioCrtWrite
Function Write character to the screen.
Syntax int SioCrtWrite(ch)
char ch; /* character to write */
Remarks The SioCrtWrite function uses the BIOS to write a
single character to the screen at the current cursor
location.
SioCrtWrite calls the BIOS directly without any
intermediate buffering or processing. It is usually
faster than a call to the C library.
Returns zero
Example /* wait up to 1 second (18 tics) for character */
if( (c = SioGetc(COM1,18)) != -1)
{/* echo to screen */
SioCrtWrite(c);
}
See Also SioKeyPress and SioKeyRead
PCL4C Reference Manual Page 7
SioCTS
Function Reads the Clear to Send (CTS) modem status bit.
Syntax int SioCTS(Port)
int Port; /* Port selected (COM1 thru COM4) */
Remarks The SioCTS function is used to read the Clear to Send
(CTS) modem status bit.
The CTS line is used by some error correcting modems
to implement hardware flow control. CTS is dropped by
the modem to signal the computer not to send data, and
is raised to signal the computer to continue.
Refer to the User's Manual for a discussion of flow
control.
Returns -2 : Port not enabled. Call SioReset first.
-4 : No such port. Expect 0 to MaxPort.
0 : CTS is clear.
>0 : CTS is set.
Example /* wait for CTS to go active */
while(1)
{if(SioCTS(Port)) break;
if(SioBrkKey())
{puts("Aborted by user");
SioDone(Port);
exit(1);
}
}
/* now we can send the character */
SioPutc(Port,ch);
See Also SioFlow, SioDSR, SioRI, SioDCD, and SioModem.
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