| 1 | /** @file
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| 2 | * IPRT Serial Port API.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2017 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef ___iprt_serialport_h
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| 27 | #define ___iprt_serialport_h
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| 28 |
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| 29 | #include <iprt/err.h>
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| 30 | #include <iprt/types.h>
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| 31 |
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| 32 | RT_C_DECLS_BEGIN
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| 33 |
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| 34 | /** @defgroup grp_rt_serial IPRT Serial Port API
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| 35 | * @ingroup grp_rt
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| 36 | *
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| 37 | * The IPRT serial port API provides a platform independent API to control a
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| 38 | * serial port of the host. It supports receiving/transmitting data as well as
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| 39 | * controlling and monitoring the status lines of a standard serial port.
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| 40 | *
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| 41 | * The user of the API is currently resposible for serializing calls to it.
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| 42 | * The only exception is RTSerialPortEvtPollInterrupt() which can be called on
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| 43 | * any thread to interrupt another thread waiting in RTSerialPortEvtPoll().
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| 44 | *
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| 45 | * @{
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| 46 | */
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| 47 |
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| 48 | /** Serial Port handle. */
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| 49 | typedef struct RTSERIALPORTINTERNAL *RTSERIALPORT;
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| 50 | /** Pointer to a Serial Port handle. */
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| 51 | typedef RTSERIALPORT *PRTSERIALPORT;
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| 52 | /** NIL Serial Port handle value. */
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| 53 | #define NIL_RTSERIALPORT ((RTSERIALPORT)0)
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| 54 |
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| 55 |
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| 56 | /**
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| 57 | * Supported parity settings.
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| 58 | */
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| 59 | typedef enum RTSERIALPORTPARITY
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| 60 | {
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| 61 | /** Invalid parity setting. */
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| 62 | RTSERIALPORTPARITY_INVALID = 0,
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| 63 | /** No parity used. */
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| 64 | RTSERIALPORTPARITY_NONE,
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| 65 | /** Even parity used. */
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| 66 | RTSERIALPORTPARITY_EVEN,
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| 67 | /** Odd parity used. */
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| 68 | RTSERIALPORTPARITY_ODD,
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| 69 | /** Mark parity (parity bit always 1) used. */
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| 70 | RTSERIALPORTPARITY_MARK,
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| 71 | /** Space parity (parity bit always 0) used. */
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| 72 | RTSERIALPORTPARITY_SPACE,
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| 73 | /** 32bit hack. */
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| 74 | RTSERIALPORTPARITY_32BIT_HACK = 0x7fffffff
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| 75 | } RTSERIALPORTPARITY;
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| 76 |
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| 77 |
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| 78 | /**
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| 79 | * Supported data bit count setting.
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| 80 | */
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| 81 | typedef enum RTSERIALPORTDATABITS
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| 82 | {
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| 83 | /** Invalid bitcount setting. */
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| 84 | RTSERIALPORTDATABITS_INVALID = 0,
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| 85 | /** 5 data bits. */
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| 86 | RTSERIALPORTDATABITS_5BITS,
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| 87 | /** 6 data bits. */
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| 88 | RTSERIALPORTDATABITS_6BITS,
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| 89 | /** 7 data bits. */
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| 90 | RTSERIALPORTDATABITS_7BITS,
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| 91 | /** 8 data bits. */
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| 92 | RTSERIALPORTDATABITS_8BITS,
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| 93 | /** 32bit hack. */
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| 94 | RTSERIALPORTDATABITS_32BIT_HACK = 0x7fffffff
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| 95 | } RTSERIALPORTDATABITS;
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| 96 |
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| 97 |
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| 98 | /**
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| 99 | * Supported stop bit setting.
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| 100 | */
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| 101 | typedef enum RTSERIALPORTSTOPBITS
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| 102 | {
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| 103 | /** Invalid stop bit setting. */
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| 104 | RTSERIALPORTSTOPBITS_INVALID = 0,
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| 105 | /** One stop bit is used. */
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| 106 | RTSERIALPORTSTOPBITS_ONE,
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| 107 | /** 1.5 stop bits are used. */
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| 108 | RTSERIALPORTSTOPBITS_ONEPOINTFIVE,
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| 109 | /** 2 stop bits are used. */
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| 110 | RTSERIALPORTSTOPBITS_TWO,
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| 111 | /** 32bit hack. */
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| 112 | RTSERIALPORTSTOPBITS_32BIT_HACK = 0x7fffffff
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| 113 | } RTSERIALPORTSTOPBITS;
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| 114 |
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| 115 |
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| 116 | /**
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| 117 | * Serial port config structure.
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| 118 | */
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| 119 | typedef struct RTSERIALPORTCFG
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| 120 | {
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| 121 | /** Baud rate. */
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| 122 | uint32_t uBaudRate;
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| 123 | /** Used parity. */
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| 124 | RTSERIALPORTPARITY enmParity;
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| 125 | /** Number of data bits. */
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| 126 | RTSERIALPORTDATABITS enmDataBitCount;
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| 127 | /** Number of stop bits. */
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| 128 | RTSERIALPORTSTOPBITS enmStopBitCount;
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| 129 | } RTSERIALPORTCFG;
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| 130 | /** Pointer to a serial port config. */
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| 131 | typedef RTSERIALPORTCFG *PRTSERIALPORTCFG;
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| 132 | /** Pointer to a const serial port config. */
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| 133 | typedef const RTSERIALPORTCFG *PCRTSERIALPORTCFG;
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| 134 |
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| 135 |
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| 136 | /** @name RTSerialPortOpen flags
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| 137 | * @{ */
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| 138 | /** Open the serial port with the receiver enabled to receive data. */
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| 139 | #define RTSERIALPORT_OPEN_F_READ RT_BIT(0)
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| 140 | /** Open the serial port with the transmitter enabled to transmit data. */
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| 141 | #define RTSERIALPORT_OPEN_F_WRITE RT_BIT(1)
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| 142 | /** Open the serial port with status line monitoring enabled to get notified about status line changes. */
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| 143 | #define RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING RT_BIT(2)
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| 144 | /** Open the serial port with BREAK condition detection enabled (Requires extra work on some hosts). */
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| 145 | #define RTSERIALPORT_OPEN_F_DETECT_BREAK_CONDITION RT_BIT(3)
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| 146 | /** Open the serial port with loopback mode enabled. */
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| 147 | #define RTSERIALPORT_OPEN_F_ENABLE_LOOPBACK RT_BIT(4)
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| 148 | /** Bitmask of valid flags. */
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| 149 | #define RTSERIALPORT_OPEN_F_VALID_MASK UINT32_C(0x0000001f)
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| 150 | /** @} */
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| 151 |
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| 152 |
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| 153 | /** @name RTSerialPortChgModemLines flags
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| 154 | * @{ */
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| 155 | /** Change the RTS (Ready To Send) line signal. */
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| 156 | #define RTSERIALPORT_CHG_STS_LINES_F_RTS RT_BIT(0)
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| 157 | /** Change the DTR (Data Terminal Ready) line signal. */
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| 158 | #define RTSERIALPORT_CHG_STS_LINES_F_DTR RT_BIT(1)
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| 159 | /** Bitmask of valid flags. */
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| 160 | #define RTSERIALPORT_CHG_STS_LINES_F_VALID_MASK UINT32_C(0x00000003)
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| 161 | /** @} */
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| 162 |
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| 163 |
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| 164 | /** @name RTSerialPortQueryStatusLines flags
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| 165 | * @{ */
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| 166 | /** The DCD (Data Carrier Detect) signal is active. */
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| 167 | #define RTSERIALPORT_STS_LINE_DCD RT_BIT(0)
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| 168 | /** The RI (Ring Indicator) signal is active. */
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| 169 | #define RTSERIALPORT_STS_LINE_RI RT_BIT(1)
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| 170 | /** The DSR (Data Set Ready) signal is active. */
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| 171 | #define RTSERIALPORT_STS_LINE_DSR RT_BIT(2)
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| 172 | /** The CTS (Clear To Send) signal is active. */
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| 173 | #define RTSERIALPORT_STS_LINE_CTS RT_BIT(3)
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| 174 | /** @} */
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| 175 |
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| 176 |
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| 177 | /** @name RTSerialPortEvtPoll flags
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| 178 | * @{ */
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| 179 | /** Data was received and can be read. */
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| 180 | #define RTSERIALPORT_EVT_F_DATA_RX RT_BIT(0)
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| 181 | /** All data was transmitted and there is room again in the transmit buffer. */
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| 182 | #define RTSERIALPORT_EVT_F_DATA_TX RT_BIT(1)
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| 183 | /** A BREAK condition was detected on the communication channel.
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| 184 | * Only available when BREAK condition detection was enabled when opening the serial port .*/
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| 185 | #define RTSERIALPORT_EVT_F_BREAK_DETECTED RT_BIT(2)
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| 186 | /** One of the monitored status lines changed, check with RTSerialPortQueryStatusLines().
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| 187 | * Only available if status line monitoring was enabled when opening the serial port. */
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| 188 | #define RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED RT_BIT(3)
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| 189 | /** Status line monitor failed with an error and status line monitoring is disabled,
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| 190 | * this cannot be given in the event mask but will be set if status line
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| 191 | * monitoring is enabled and the monitor failed. */
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| 192 | #define RTSERIALPORT_EVT_F_STATUS_LINE_MONITOR_FAILED RT_BIT(4)
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| 193 | /** Bitmask of valid flags. */
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| 194 | #define RTSERIALPORT_EVT_F_VALID_MASK UINT32_C(0x0000001f)
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| 195 | /** @} */
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| 196 |
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| 197 |
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| 198 | /**
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| 199 | * Opens a serial port with the specified flags.
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| 200 | *
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| 201 | * @returns IPRT status code.
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| 202 | * @param phSerialPort Where to store the IPRT serial port handle on success.
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| 203 | * @param pszPortAddress The address of the serial port (host dependent).
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| 204 | * @param fFlags Flags to open the serial port with, see RTSERIALPORT_OPEN_F_*.
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| 205 | */
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| 206 | RTDECL(int) RTSerialPortOpen(PRTSERIALPORT phSerialPort, const char *pszPortAddress, uint32_t fFlags);
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| 207 |
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| 208 |
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| 209 | /**
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| 210 | * Closes the given serial port handle.
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| 211 | *
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| 212 | * @returns IPRT status code.
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| 213 | * @param hSerialPort The IPRT serial port handle.
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| 214 | */
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| 215 | RTDECL(int) RTSerialPortClose(RTSERIALPORT hSerialPort);
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| 216 |
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| 217 |
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| 218 | /**
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| 219 | * Gets the native handle for an IPRT serial port handle.
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| 220 | *
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| 221 | * @returns The native handle. -1 on failure.
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| 222 | * @param hSerialPort The IPRT serial port handle.
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| 223 | */
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| 224 | RTDECL(RTHCINTPTR) RTSerialPortToNative(RTSERIALPORT hSerialPort);
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| 225 |
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| 226 |
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| 227 | /**
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| 228 | * Tries to read the given number of bytes from the serial port, blocking version.
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| 229 | *
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| 230 | * @returns IPRT status code.
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| 231 | * @retval VERR_SERIALPORT_BREAK_DETECTED if a break was detected before the requested number of bytes was received.
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| 232 | * @param hSerialPort The IPRT serial port handle.
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| 233 | * @param pvBuf Where to store the read data.
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| 234 | * @param cbToRead How much to read from the serial port.
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| 235 | * @param pcbRead Where to store the number of bytes received until an error condition occurred, optional.
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| 236 | */
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| 237 | RTDECL(int) RTSerialPortRead(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead);
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| 238 |
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| 239 |
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| 240 | /**
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| 241 | * Tries to read the given number of bytes from the serial port, non-blocking version.
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| 242 | *
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| 243 | * @returns IPRT status code.
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| 244 | * @retval VERR_SERIALPORT_BREAK_DETECTED if a break was detected before anything could be received.
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| 245 | * @retval VINF_TRY_AGAIN if nothing could be read.
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| 246 | * @param hSerialPort The IPRT serial port handle.
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| 247 | * @param pvBuf Where to store the read data.
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| 248 | * @param cbToRead How much to read from the serial port.
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| 249 | * @param pcbRead Where to store the number of bytes received.
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| 250 | */
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| 251 | RTDECL(int) RTSerialPortReadNB(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead);
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| 252 |
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| 253 |
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| 254 | /**
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| 255 | * Writes the given data to the serial port, blocking version.
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| 256 | *
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| 257 | * @returns IPRT status code.
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| 258 | * @param hSerialPort The IPRT serial port handle.
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| 259 | * @param pvBuf The data to write.
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| 260 | * @param cbToWrite How much to write.
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| 261 | * @param pcbWritten Where to store the number of bytes written until an error condition occurred, optional.
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| 262 | */
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| 263 | RTDECL(int) RTSerialPortWrite(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten);
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| 264 |
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| 265 |
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| 266 | /**
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| 267 | * Writes the given data to the serial port, non-blocking version.
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| 268 | *
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| 269 | * @returns IPRT status code.
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| 270 | * @retval VINF_TRY_AGAIN if nothing could be written.
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| 271 | * @param hSerialPort The IPRT serial port handle.
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| 272 | * @param pvBuf The data to write.
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| 273 | * @param cbToWrite How much to write.
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| 274 | * @param pcbWritten Where to store the number of bytes written.
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| 275 | */
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| 276 | RTDECL(int) RTSerialPortWriteNB(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten);
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| 277 |
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| 278 |
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| 279 | /**
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| 280 | * Queries the current active serial port config.
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| 281 | *
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| 282 | * @returns IPRT status code.
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| 283 | * @param hSerialPort The IPRT serial port handle.
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| 284 | * @param pCfg Where to store the current active config.
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| 285 | */
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| 286 | RTDECL(int) RTSerialPortCfgQueryCurrent(RTSERIALPORT hSerialPort, PRTSERIALPORTCFG pCfg);
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| 287 |
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| 288 |
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| 289 | /**
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| 290 | * Change the serial port to the given config.
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| 291 | *
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| 292 | * @returns IPRT status code.
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| 293 | * @retval VERR_SERIALPORT_INVALID_BAUDRATE if the baud rate is not supported on the serial port.
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| 294 | * @param hSerialPort The IPRT serial port handle.
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| 295 | * @param pCfg The config to write.
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| 296 | * @param pErrInfo Where to store additional information on error, optional.
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| 297 | */
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| 298 | RTDECL(int) RTSerialPortCfgSet(RTSERIALPORT hSerialPort, PCRTSERIALPORTCFG pCfg, PRTERRINFO pErrInfo);
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| 299 |
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| 300 |
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| 301 | /**
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| 302 | * Poll for an event on the given serial port.
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| 303 | *
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| 304 | * @returns IPRT status code.
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| 305 | * @retval VERR_TIMEOUT if the timeout was reached before an event happened.
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| 306 | * @retval VERR_INTERRUPTED if another thread interrupted the polling through RTSerialPortEvtPollInterrupt().
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| 307 | * @param hSerialPort The IPRT serial port handle.
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| 308 | * @param fEvtMask The mask of events to receive, see RTSERIALPORT_EVT_F_*
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| 309 | * @param pfEvtsRecv Where to store the bitmask of events received.
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| 310 | * @param msTimeout Number of milliseconds to wait for an event.
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| 311 | */
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| 312 | RTDECL(int) RTSerialPortEvtPoll(RTSERIALPORT hSerialPort, uint32_t fEvtMask, uint32_t *pfEvtsRecv,
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| 313 | RTMSINTERVAL msTimeout);
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| 314 |
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| 315 |
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| 316 | /**
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| 317 | * Interrupt another thread currently polling for an event.
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| 318 | *
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| 319 | * @returns IPRT status code.
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| 320 | * @param hSerialPort The IPRT serial port handle.
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| 321 | *
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| 322 | * @note Any thread.
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| 323 | */
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| 324 | RTDECL(int) RTSerialPortEvtPollInterrupt(RTSERIALPORT hSerialPort);
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| 325 |
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| 326 |
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| 327 | /**
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| 328 | * Sets or clears a BREAK condition on the given serial port.
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| 329 | *
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| 330 | * @returns IPRT status code.
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| 331 | * @param hSerialPort The IPRT serial port handle.
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| 332 | * @param fSet Flag whether to set the BREAK condition or clear it.
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| 333 | */
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| 334 | RTDECL(int) RTSerialPortChgBreakCondition(RTSERIALPORT hSerialPort, bool fSet);
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| 335 |
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| 336 |
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| 337 | /**
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| 338 | * Modify the status lines of the given serial port.
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| 339 | *
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| 340 | * @returns IPRT status code.
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| 341 | * @param hSerialPort The IPRT serial port handle.
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| 342 | * @param fClear Combination of status lines to clear, see RTSERIALPORT_CHG_STS_LINES_F_*.
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| 343 | * @param fSet Combination of status lines to set, see RTSERIALPORT_CHG_STS_LINES_F_*.
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| 344 | *
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| 345 | * @note fClear takes precedence over fSet in case the same status line bit is set in both arguments.
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| 346 | */
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| 347 | RTDECL(int) RTSerialPortChgStatusLines(RTSERIALPORT hSerialPort, uint32_t fClear, uint32_t fSet);
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| 348 |
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| 349 |
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| 350 | /**
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| 351 | * Query the status of the status lines on the given serial port.
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| 352 | *
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| 353 | * @returns IPRT status code.
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| 354 | * @param hSerialPort The IPRT serial port handle.
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| 355 | * @param pfStsLines Where to store the bitmask of active status lines on success,
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| 356 | * see RTSERIALPORT_STS_LINE_*.
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| 357 | */
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| 358 | RTDECL(int) RTSerialPortQueryStatusLines(RTSERIALPORT hSerialPort, uint32_t *pfStsLines);
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| 359 |
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| 360 | /** @} */
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| 361 |
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| 362 | RT_C_DECLS_END
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| 363 |
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| 364 | #endif
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| 365 |
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