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Personal Communications Library For Windows (PCL4W) REFERENCE MANUAL Version 1.01 Feb 21, 1994 This software is provided as-is. There are no warranties, expressed or implied. Copyright (C) 1994 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 PCL4W Reference Manual Page 1 T A B L E O F C O N T E N T S Chapter Page Table of Contents..................................2 Introduction.......................................3 SioBaud.........................................4 SioBrkSig.......................................4 SioCTS..........................................5 SioDCD..........................................5 SioDone.........................................6 SioDSR..........................................6 SioDTR..........................................7 SioFIFO.........................................7 SioFlow.........................................8 SioGetc.........................................8 SioInfo.........................................9 SioIRQ..........................................9 SioLine........................................10 SioLoopBack....................................10 SioModem.......................................11 SioParms.......................................11 SioPorts.......................................12 SioPutc........................................12 SioRead........................................13 SioReset.......................................13 SioRI..........................................14 SioRTS.........................................14 SioRxBuf.......................................15 SioRxFlush.....................................15 SioRxQue.......................................16 SioTxBuf.......................................16 SioTxFlush.....................................17 SioTxQue.......................................17 SioUART........................................18 SioUnGetc......................................18 Function Summary..................................19 Error Code Summary................................20 PCL4W Reference Manual Page 2 Introduction This manual lists all of the PCL4W 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() (see file SIOERROR.C) to print the associated text for errors. Example Code Segment ***************************************************************** * int Code; /* MUST be 'int', not 'char' */ * * * * Code = SioFunction( ); /* any PCL4W 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... * * * ***************************************************************** The program SIMPLE is provided as a stright forward and simple example of the use of the PCL4W librray -- at least as straight forward as any Windows programming can be. Also look at the TERM program, which is distributed separately from PCL4W. Many PCL4W functions are used somewhere in TERM. Other example programs will be provided. Look for them on our User Support BBS. Also note that there are two versions of the library. One version is with transmitter interrupts disabled and one with transmitter interrupts enabled. Refer to the User's Manual (PCL4W.USR) for additional information. PCL4W Reference Manual Page 3 **************************************************************************** * SioBaud * 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. Code Rate Name Code Rate Name 0 300 Baud300 5 9600 Baud9600 1 600 Baud600 6 19200 Baud19200 2 1200 Baud1200 7 38400 Baud38400 3 2400 Baud2400 8 57600 Baud57600 4 4800 Baud4800 9 115200 Baud115200 Returns -4 : No such port. Expect 0 to MaxPort. -11 : Bad baud rate code. See above code values. See Also SioReset **************************************************************************** * SioBrkSig * 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 PCL4W.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) See Also SioBrkKey PCL4W Reference Manual Page 4 **************************************************************************** * SioCTS * 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. See Also SioFlow, SioDSR, SioRI, SioDCD, and SioModem. **************************************************************************** * SioDCD * Reads the Data Carrier Detect (DCD) modem staus bit. * **************************************************************************** Syntax int SioDCD(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioDCD function is used to read the Data Carrier Detect (DCD) modem status bit. Also see SioModem. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. 0 : DCD is clear. >0 : DCD is set. See Also SioDSR, SioCTS, SioRI, and SioModem. PCL4W Reference Manual Page 5 **************************************************************************** * SioDone * Terminates further serial processing. * **************************************************************************** Syntax int SioDone(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioDone function terminates further serial processing. SioDone MUST be called before exiting your application so that interrupts can be restored to their original state. Failure to do this can crash the operating system. If you forget to call SioDone before exiting, be sure to re-boot your computer. You can call SioDone even if SioReset has not been called, so it is good practice to always call SioDone before exiting your application. Also note that SioDone dereferences the transmit and receive buffers set up by SioRxQue and SioTxQue. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. See Also SioReset. **************************************************************************** * SioDSR * Reads the Data Set Ready (DSR) modem status bit. * **************************************************************************** Syntax int SioDSR(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioDSR function is used to read the Data Set Ready (DSR) modem status bit. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. 0 : DSR is clear. >0 : DSR is set See Also SioCTS, SioRI, SioDCD, and SioModem PCL4W Reference Manual Page 6 **************************************************************************** * SioDTR * Set, clear, or read Data Terminal Ready (DTR) status bit. * **************************************************************************** Syntax int SioDTR(Port,Cmd) int Port; /* Port selected (COM1 thru COM4) */ char Cmd; /* DTR command (SET, CLEAR, or READ) */ Remarks The SioDTR function controls the Data Terminal Ready (DTR) bit in the modem control register. Commands (defined in PCL4W.H) are: SET_LINE ('S') to set DTR (ON) CLEAR_LINE ('C') to clear DTR (OFF) READ_LINE ('R') to read DTR Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. -5 : Not one of 'S', 'C', or 'R'. 0 : DTR is OFF (READ_LINE Command). >0 : DTR is ON (READ_LINE Command). See Also SioRTS. **************************************************************************** * SioFIFO * Sets the FIFO trigger level (16550 UART only). * **************************************************************************** Syntax int SioFIFO(Port,LevelCode) int Port; /* Port selected (COM1 thru COM4) */ int LevelCode; /* FIFO level code (see below) */ Remarks The SioFIFO function is used to enable both transmit & receive FIFOs for 16550 UARTS, and to set the trigger level at which receive interrupts are generated. For example, if the FIFO level is set to 8, then the 16550 UART will not generate an interrupt until 8 bytes have been received. This reduces the number of interrupts generated and allows faster processing with slower machines or when running simultaneous ports. In order to take advantage of the TX FIFO, use the PCL4C library with TX interrupts enabled. In order to test if your port is a 16550 UART, call SioFIFO with a LevelCode of other than FIFO_OFF. SioFIFO can be called for the 8250 and 16450 UART without ill effect. Code PCL4W.H Name Trigger Level -1 FIFO_OFF Disable FIFO 0 LEVEL_1 1 byte 1 LEVEL_4 4 bytes 2 LEVEL_8 8 bytes 3 LEVEL_14 14 bytes Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. >0 : FIFO level set. PCL4W Reference Manual Page 7 0 : FIFO level not set (not 16550). PCL4W Reference Manual Page 8 **************************************************************************** * SioFlow * Sets hardware (RTS/CTS) flow control. * **************************************************************************** Syntax int SioFlow(Port,Flag) int Port; /* Port selected (COM1 thru COM4) */ int Flag; /* TRUE to enable flow control */ Remarks The SioFlow function is used to enable or disable hardware flow control. Hardware flow control uses RTS and CTS to control data flow between the modem and the computer. Refer to the User's Manual for a discussion of flow control. To enable hardware flow control, call SioFlow with Flag=TRUE. In order for hardware flow control to work correctly, your modem must also be configured to work with hardware flow control, and your computer to modem cable must have RTS and CTS wired straight through. If you enable hardware flow control, do not modify the RTS line (by calling SioRTS) unless you know exactly what you are doing. Flow control is disabled after resetting a port. To explicitly disable hardware flow control, call SioFlow with Flag=FALSE. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. =0 : Flow control disabled. >0 : Flow control enabled. See Also SioPutc **************************************************************************** * SioGetc * Reads the next character from the serial line. * **************************************************************************** Syntax int SioGetc(Port) int Port; /* COM1 to COM4 */ Remarks The SioGetc function reads a byte from the selected serial port. The function will return immediately if no serial byte is ready. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. -1 : If timed out. >0 : Character read. See Also SioUnGetc and SioPutc. PCL4W Reference Manual Page 9 **************************************************************************** * SioInfo * Returns PCL4W library information. * **************************************************************************** Syntax int SioInfo(Cmd) char Cmd; /* Command (VERSION or MODEL) */ Remarks The SioInfo function returns an integer code corresponding to either the (1) library version number or (2) whether or not transmitter interrupts are enabled. Returns Version ('V') hex byte XY where version is denoted as X.Y TX Interrupts ('I') TRUE if transmitter interrupts are enabled in the library, otherwise FALSE. **************************************************************************** * SioIRQ * Assigns an IRQ line to a port. * **************************************************************************** Syntax int SioIRQ(Port,IRQcode) int Port; /* Port selected (COM1 thru COM4) */ int IRQcode; /* IRQ number [IRQ2..IRQ7] */ Remarks The SioIRQ function assigns an IRQ line to a port. That is, SioIRQ maps an IRQ to a port. SioIRQ (like SioUART) must be called before calling SioReset. Unless you have a non-standard (COM1 & COM3 use IRQ4 while COM2 & COM4 use IRQ3) serial port configuration (or don't want to run more than 2 ports concurrently), you will not need to call SioIRQ. Be EXTREMELY careful with SioIRQ as it can lock your machine up if given incorrect information. In particular, remember that your port hardware must generate the interrupt that you have specified. You should refer to your serial board hardware manual for specfic instructions in configuring your hardware. Be sure to call SioPorts first to setup DigiBoard ports if you have them. Refer to the PCL4W Users Manual for additional information. Returns -4 : No such port. Expect 0 to MaxPort. -15 : Port already enabled. SioReset has already been called. -17 : No such IRQ. -18 : ISR limit (maximum of 4 PC IRQs) exceeded. 0 : Otherwise See Also SioUART and SioPorts. PCL4W Reference Manual Page 10 **************************************************************************** * SioLine * Reads the line status register. * **************************************************************************** Syntax int SioLine(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioLine function reads the line status register. The individual bit masks are as follows: 0x40 = Transmitter empty. 0x20 = Transmitter buffer empty. 0x10 = Break detected. 0x08 = Framming error. 0x04 = Parity error. 0x02 = Overrun error. 0x01 = Data ready. The above are documented in the file PCL4W.H. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. >0 : Line status (rightmost byte of word). See Also SioModem. **************************************************************************** * SioLoopBack * Does a UART loopback test. * **************************************************************************** Syntax int SioLoopBack(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks SioLoopBack makes use of the built in loopback test capability of the INS8250 family UART. Normally SioLoopBack will never need to be called unless you suspect that your UART is bad. Many UARTs must be reset after running a loopback test. Returns 0 : Loopback test is successfull. -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. -12 : Loopback test fails. PCL4W Reference Manual Page 11 **************************************************************************** * SioModem * Reads the modem status register. * **************************************************************************** Syntax int SioModem(Port, Mask) int Port; /* Port selected (COM1 thru COM4) */ char Mask; /* Modem function mask */ Remarks The SioModem function reads the modem register. The bit definitions for the function mask are as follows: Bit Name Function Bit Name Function 7 DCD Data Carrier Detect 3 DeltaDCD DCD has changed 6 RI Ring Indicator 2 DeltaRI RI has changed 5 DSR Data Set Ready 1 DeltaDSR DSR has changed 4 CTS Clear To Send 0 DeltaCTS CTS has changed Bits 4 through 7 represent the absolute state of their respective RS-232 inputs. Bits 0 through 3 represent a change in the state of their respective RS-232 inputs since last read. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. >0 : Modem status (rightmost byte of word). See Also SioCTS, SioDCD, SioDSR and SioRI. **************************************************************************** * SioParms * Sets parity, stop bits, and word length. * **************************************************************************** Syntax int SioParms(Port,ParityCode,StopBitsCode, WordLengthCode) int Port; /* Port selected (COM1 - COM4) */ int ParityCode; /* parity code [0,1,2] */ int StopBitsCode; /* stop bits code [0,1] */ int WordLengthCode; /* word length code [0,1,2,3] */ Remarks The SioParms function sets the parity, stop bits, and word length. If the default parity (none), stop bits (1), or word length (8) is not acceptable, then they can be changed by calling SioParms. SioParms can be called either before or after calling SioReset. See file PCL4W.H. (8 = default) Value Description PCL4W.H Name ParityCode: *0 no parity NoParity 1 odd parity OddParity 3 even parity EvenParity StopBitsCode: *0 1 stop bit OneStopBit 1 2 stop bits TwoStopBits WordLengthCode: 0 5 data bits WordLength5 1 6 data bits WordLength6 2 7 data bits WordLength7 *3 8 data bits WordLength8 Returns -4 : No such port. Expect 0 to MaxPort. -7 : Bad parity code selected. Expecting 0 to 2. -8 : Bad stop bits code. Expecting 0 or 1. -9 : Bad word length code. Expecting 0 to 3. See Also SioReset. PCL4W Reference Manual Page 12 **************************************************************************** * SioPorts * Sets number of PC & Digiboard ports. * **************************************************************************** Syntax int SioPorts(NumberPorts,FirstPort,StatusReg) int NumberPorts; /* total number of ports */ int FirstPort; /* First DigiBoard port */ int StatusReg; /* DigiBoard Status Register */ Remarks The SioPorts function must be called before ANY other serial functions. The purpose of the SioPorts function is to set the total number of ports, the first DigiBoard port and the DigiBoard status register address. Once SioPorts is called, all COM ports starting with "FirstPort" will be treated as DigiBoard ports. The default setup is 4 standard PC ports and no DigiBoard ports [ SioPorts(4,4,0) ]. The standard DigiBoard status register is 0x140 if you are using an odd IRQ for the DigiBoard, and 0x141 if you are using an even IRQ for the DigiBoard. If you change this address on your DigiBoard, be sure to specify the correct value for "StatusReg". Returns -4 : No such port. Expect 0 to 9. 0 : No error (sets MaxPort to NumberPorts-1). See Also SioUART, SioIRQ. **************************************************************************** * SioPutc * Transmit a character over a serial line. * **************************************************************************** Syntax int SioPutc(Port,c) int Port; /* Port selected (COM1 thru COM4) */ char c; /* character to send */ Remarks The SioPutc function transmits one character over the selected serial line. If flow control has been enabled, then SioPutc may return a -1 (time out) if the number of tics specified in the SioFlow function was exceeded waiting for the modem to raise CTS. Refer to the User's Manual for a discussion of flow control. If transmitter interrupts are enabled (there are separate versions of the library for transmitter interrupts enabled), then the byte is placed in the transmit buffer, awaiting transmission by the PCL4W interrupt service routine. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. -1 : Timed out waiting for CTS (flow control enabled) See Also SioGetc and SioFlow. PCL4W Reference Manual Page 13 **************************************************************************** * SioRead * Reads any UART register. * **************************************************************************** Syntax int SioRead(Port,Reg) int Port; /* Port selected (COM1 thru COM4) */ int Reg; /* UART register (0 to 7) */ Remarks The SioReset function directly reads the contents of any of the 7 UART registers. This function is useful when debugging application programs and as a method for verifying UART contents. Refer to the PCL4W Users Manual for a discussion of the 7 UART registers. The line status register (register 5) can also be read with SioLine while the modem status register (register 6) can also be read with SioModem. Refer to the PCL4W User's Manual for a discussion of the UART registers. Returns -3 : No buffer available. Call SioRxBuf first. -4 : No such port. Expect 0 to MaxPort. See Also SioLine and SioModem. **************************************************************************** * SioReset * Initialize a serial port for processing. * **************************************************************************** Syntax int SioReset(Port,BaudCode) int Port; /* Port selected (COM1 thru COM4) */ int BaudCode; /* baud code or -1 */ Remarks The SioReset function initializes the selected serial port. SioReset should be called after calling SioParm and SioRxBuf but before making any other calls to PCL4W. SioReset uses the parity, stop bits, and word length value previously set if SioParm was called, otherwise the default values (see SioParm) are used. Recall that COM1 and COM3 share the same interrupt vector and therefore cannot operate simultaneously. Similiarly, COM2 and COM4 cannot operate simultaneously. Any other combination of two ports can be used. By specifing NORESET (-1) for the baud rate code, the port will NOT be reset. This is used to "take over" a port from a host communications program that allows a "DOS gateway". External protocols can be implemented this way. See SioBaud for a list of the baud rate codes, or see "PCL4W.H". Returns -3 : No buffer available. Call SioRxBuf first. -4 : No such port. Expect 0 to MaxPort. -11 : Bad baud rate code selected. Expecting 0 to 9. -13 : UART undefined. SioUART(Port,0) was called previously. -14 : Bad or missing UART. You may not have hardware present. -15 : Port already enabled. SioReset has already been called. -16 : Interrupt already in use. See Also SioBaud, SioParms, SioRxBuf, SioDone, and SioUART. PCL4W Reference Manual Page 14 **************************************************************************** * SioRI * Reads the Ring Indicator (RI) modem status bit. * **************************************************************************** Syntax int SioRI(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioRI function is used to read the Ring Indicator (RI) modem status bit. Also see SioModem. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. 0 : RI is clear. >0 : RI is set (RING has occurred). See Also SioDSR, SioCTS, SioDCD, and SioModem. **************************************************************************** * SioRTS * Sets, clears, or reads the Request to Send (RTS) line. * **************************************************************************** Syntax int SioRTS(Port,Cmd) int Port; /* COM1 to COM4 */ char Cmd; /* RTS command (SET, CLEAR, or READ) */ Remarks The SioRTS function controls the Request to Send (RTS bit in the modem control register. The RTS line is used by some error correcting modems to implement hardware flow control. RTS is dropped by the computer to signal the modem not to send data, and is raised to signal the modem to continue. Refer to the User's Manual for a discussion of flow control. Commands (defined in PCL4W.H) are: SET_LINE ('S') -- set RTS (ON) CLEAR_LINE ('C') -- clear RTS (OFF) READ_LINE ('R') -- read RTS Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. -5 : Command is not one of 'S', 'C', or 'R'. 0 : RTS is OFF (READ_LINE Command). >0 : RTS is ON (READ_LINE Command). See Also SioFlow and SioDTR. PCL4W Reference Manual Page 15 **************************************************************************** * SioRxBuf * Sets up receive buffers. * **************************************************************************** Syntax int SioRxBuf(Port,Buffer,SizeCode) int Port; /* Port selected (COM1 thru COM4) */ char *Buffer /* Receive buffer */ int SizeCode; /* Buffer size code */ Remarks The SioRxBuf function passes the address and size of the receive buffer to PCL4W. Recall that PCL4W requires a receive buffer for each port in simultaneous operation since the receive function is interrupt driven. It must be called before any incoming characters can be received. SioRxBuf must be called before SioReset. Buffer size codes are listed in "PCL4W.H". Size Code Buffer Size PCL4W.H Name 0 8 bytes Size8 1 16 bytes Size16 2 32 bytes Size32 3 64 bytes Size64 4 128 bytes Size128 5 256 bytes Size256 6 512 bytes Size512 7 1024 bytes Size1024 or Size1K 8 2048 bytes Size2048 or Size2K 9 4096 bytes Size4096 or Size4K 10 8192 bytes Size8192 or Size8K 11 16384 bytes Size16384 or Size16K 12 32768 bytes Size32768 or Size32K Returns -4 : No such port. Expect 0 to MaxPort. -10 : Bad buffer size code. Expecting 0 to 11. See Also SioReset. **************************************************************************** * SioRxFlush * Flushes (clears) the receive buffer. * **************************************************************************** Syntax int SioRxFlush(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioRxFlush function will delete any characters in the receive buffer for the specified port. After execution, the receive buffer will be empty. Call SioRxBuf after resetting a port in order to delete any spurious characters. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. See Also SioRxQue. PCL4W Reference Manual Page 16 **************************************************************************** * SioRxQue * Returns the number of bytes in the receive queue. * **************************************************************************** Syntax int SioRxQue(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioRxQue function will return the number of characters in the receive queue at the time of the call. It can be used to implement XON/XOFF flow control. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. See Also SioRxFlush. **************************************************************************** * SioTxBuf * Sets up transmitter buffer. * **************************************************************************** Syntax int SioTxBuf(Port,Buffer,SizeCode) int Port; /* Port selected (COM1 thru COM4) */ char *Buffer; /* Transmit buffer */ int SizeCode; /* Buffer size code */ Remarks The SioTxBuf function passes the address and size of the transmit buffer to PCL4W, provided that you will link with a PCL4W library with transmitter interrupts enabled. PCL4W requires a transmit buffer for each port in simultaneous operation if you are using the version of the library with transmitter interrupts enabled (PCL4W2.LIB). SioTxBuf() must be called before SioReset. Size Code Buffer Size PCL4W.H Name 0 8 bytes Size8 1 16 bytes Size16 2 32 bytes Size32 3 64 bytes Size64 4 128 bytes Size128 5 256 bytes Size256 6 512 bytes Size512 7 1024 bytes Size1024 or Size1K 8 2048 bytes Size2048 or Size2K 9 4096 bytes Size4096 or Size4K 10 8192 bytes Size8192 or Size8K 11 16384 bytes Size16384 or Size16K 12 32768 bytes Size32768 or Size32K This function is not used unless the transmitter interrupts are enabled (PCL4W2.LIB). Refer to the PCL4W Users Manual for information on transmitter (TX) interrupts. Returns -4 : No such port. Expect 0 to MaxPort. -10 : Bad buffer size code. Expecting 0 to 11. See Also SioRxBuf and SioReset. PCL4W Reference Manual Page 17 **************************************************************************** * SioTxFlush * Flushes (clears) the transmitter buffer. * **************************************************************************** Syntax int SioTxFlush(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioTxFlush function will delete any characters in the transmit buffer for the specified port, provided that you will link with a PCL4W library with transmitter interrupts enabled. After execution, the transmit buffer will be empty. Once this function is called, any character in the transmit buffer (put there by SioPutc) will be lost and therefore not transmitted. This function is not used unless the transmitter interrupts are enabled Refer to the PCL4W Users Manual for information on transmitter (TX) interrupts. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. See Also SioTxQue. **************************************************************************** * SioTxQue * Returns the number of bytes in the transmit queue. * **************************************************************************** Syntax int SioTxQue(Port) int Port; /* Port selected (COM1 thru COM4) */ Remarks The SioTxQue function will return the number of characters in the transmit queue at the time of the call, provided that you will link with a PCL4W library with transmitter interrupts enabled. This function is not used unless the transmitter interrupts are enabled. Refer to the PCL4W Users Manual for information on transmitter (TX) interrupts. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. See Also SioTxFlush. PCL4W Reference Manual Page 18 **************************************************************************** * SioUART * Sets the UART base address. * **************************************************************************** Syntax int SioUART(Port,Address) int Port; /* COM1 to COM4 */ int Address; /* UART address */ Remarks The SioUART function sets the UART base address for the specified port. SioUART must be called before SioReset in order to have effect. Be extremely sure that you know what you are doing! Note that PCL4W uses the standard PC/XT/AT port addresses, interrupt request lines, and interrupt service vectors. Therefore, this function is only needed for non-standard ports. Returns >0 : The previous base address for this port. -4 : No such port. Expect 0 to MaxPort. -15 : Port already enabled. SioReset has already been called. See Also SioPorts, SioIRQ, and SioReset. **************************************************************************** * SioUnGetc * "Un-gets" the last character read with SioGetc(). * **************************************************************************** Syntax int SioUnGetc(Port,c) int Port; /* Port selected (COM1 thru COM4) */ char c; /* character to unget */ Remarks The SioUnGetc function returns ("pushes") the character back into the serial input buffer. The character pushed will be the next character returned by SioGetc. Only one character can be pushed back. This function works just like the "ungetc" function in the C language. Returns -2 : Port not enabled. Call SioReset first. -4 : No such port. Expect 0 to MaxPort. See Also SioReset. PCL4W Reference Manual Page 19 Function Sumary *********************************************************** * Function * Arg1 * Arg2 * Arg3 * Arg4 * *********************************************************** * SioBaud * Port * BaudCode * * * * SioBrkSig * Port * Cmd * * * * SioCTS * Port * * * * * SioDCD * Port * * * * * SioDone * Port * * * * * SioDSR * Port * * * * * SioDTR * Port * Cmd * * * * SioError * Code * * * * * SioFIFO * Port * FIFOcode * * * * SioFlow * Port * * * * * SioGetc * Port * * * * * SioInfo * Cmd * * * * * SioIRQ * Port * IRQcode * ISRcode * * * SioLine * Port * * * * * SioLoopBack * Port * * * * * SioModem * Port * Mask * * * * SioParms * Port * Parity * StopBits *WordLength* * SioPorts * NbrPorts * FirstDBP *StatusReg * * * SioPutc * Port * Ch * * * * SioRead * Port * Register * * * * SioReset * Port * BaudCode * * * * SioRI * Port * * * * * SioRTS * Port * Cmd * * * * SioRxBuf * Port * Buffer * SizeCode * * * SioRxFlush * Port * * * * * SioRxQue * Port * * * * * SioTxBuf * Port * Buffer * SizeCode * * * SioTxFlush * Port * * * * * SioTxQue * Port * * * * * SioUART * Port * Address * * * * SioUnGetc * Port * Ch * * * *********************************************************** PCL4W Reference Manual Page 20 Error Code Summary ***************************************************************** * Code * Description * ***************************************************************** * 0 * No error. * * -1 * Timeout waiting for I/O. * * -2 * Port not enabled. Call SioReset first. * * -3 * No buffer available. Call SioRxBuf first. * * -4 * No such port. Expect 0 to MaxPort. (COM1 = 0) * * -5 * Expected 'S', 'C', or 'R' as 2nd argument. * * -6 * Expected 'A', 'C', or 'D' as 2nd argument. * * -7 * Bad parity code specified. Expected 0 to 7. * * -8 * Bad stop bits code specified. Expected 0 or 1. * * -9 * Bad wordlength code specified. Expect 0 to MaxPort. * * -10 * Bad buffer size code specified. Expected 0 to 11. * * -11 * Bad baud rate code. Expected 0 to 9. * * -12 * Loopback test fails. * * -13 * UART undefined. * * -14 * Missing or bad UART. (no UART hardware ?) * * -15 * Port already enabled. * * -16 * ISR (interrupt) already in use. * * -17 * No such IRQ. (Should be 2 to 7) * * -18 * ISR limit (maximum of 4 PC IRQs) exceeded. * ***************************************************************** PCL4W Reference Manual Page 21