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| -rw-r--r-- | include/iprt/serialport.h | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/include/iprt/serialport.h b/include/iprt/serialport.h new file mode 100644 index 00000000..0a73a771 --- /dev/null +++ b/include/iprt/serialport.h @@ -0,0 +1,367 @@ +/** @file + * IPRT Serial Port API. + */ + +/* + * Copyright (C) 2017-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef IPRT_INCLUDED_serialport_h +#define IPRT_INCLUDED_serialport_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/types.h> + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_serial IPRT Serial Port API + * @ingroup grp_rt + * + * The IPRT serial port API provides a platform independent API to control a + * serial port of the host. It supports receiving/transmitting data as well as + * controlling and monitoring the status lines of a standard serial port. + * + * The user of the API is currently resposible for serializing calls to it. + * The only exception is RTSerialPortEvtPollInterrupt() which can be called on + * any thread to interrupt another thread waiting in RTSerialPortEvtPoll(). + * + * @{ + */ + +/** Serial Port handle. */ +typedef struct RTSERIALPORTINTERNAL *RTSERIALPORT; +/** Pointer to a Serial Port handle. */ +typedef RTSERIALPORT *PRTSERIALPORT; +/** NIL Serial Port handle value. */ +#define NIL_RTSERIALPORT ((RTSERIALPORT)0) + + +/** + * Supported parity settings. + */ +typedef enum RTSERIALPORTPARITY +{ + /** Invalid parity setting. */ + RTSERIALPORTPARITY_INVALID = 0, + /** No parity used. */ + RTSERIALPORTPARITY_NONE, + /** Even parity used. */ + RTSERIALPORTPARITY_EVEN, + /** Odd parity used. */ + RTSERIALPORTPARITY_ODD, + /** Mark parity (parity bit always 1) used. */ + RTSERIALPORTPARITY_MARK, + /** Space parity (parity bit always 0) used. */ + RTSERIALPORTPARITY_SPACE, + /** 32bit hack. */ + RTSERIALPORTPARITY_32BIT_HACK = 0x7fffffff +} RTSERIALPORTPARITY; + + +/** + * Supported data bit count setting. + */ +typedef enum RTSERIALPORTDATABITS +{ + /** Invalid bitcount setting. */ + RTSERIALPORTDATABITS_INVALID = 0, + /** 5 data bits. */ + RTSERIALPORTDATABITS_5BITS, + /** 6 data bits. */ + RTSERIALPORTDATABITS_6BITS, + /** 7 data bits. */ + RTSERIALPORTDATABITS_7BITS, + /** 8 data bits. */ + RTSERIALPORTDATABITS_8BITS, + /** 32bit hack. */ + RTSERIALPORTDATABITS_32BIT_HACK = 0x7fffffff +} RTSERIALPORTDATABITS; + + +/** + * Supported stop bit setting. + */ +typedef enum RTSERIALPORTSTOPBITS +{ + /** Invalid stop bit setting. */ + RTSERIALPORTSTOPBITS_INVALID = 0, + /** One stop bit is used. */ + RTSERIALPORTSTOPBITS_ONE, + /** 1.5 stop bits are used. */ + RTSERIALPORTSTOPBITS_ONEPOINTFIVE, + /** 2 stop bits are used. */ + RTSERIALPORTSTOPBITS_TWO, + /** 32bit hack. */ + RTSERIALPORTSTOPBITS_32BIT_HACK = 0x7fffffff +} RTSERIALPORTSTOPBITS; + + +/** + * Serial port config structure. + */ +typedef struct RTSERIALPORTCFG +{ + /** Baud rate. */ + uint32_t uBaudRate; + /** Used parity. */ + RTSERIALPORTPARITY enmParity; + /** Number of data bits. */ + RTSERIALPORTDATABITS enmDataBitCount; + /** Number of stop bits. */ + RTSERIALPORTSTOPBITS enmStopBitCount; +} RTSERIALPORTCFG; +/** Pointer to a serial port config. */ +typedef RTSERIALPORTCFG *PRTSERIALPORTCFG; +/** Pointer to a const serial port config. */ +typedef const RTSERIALPORTCFG *PCRTSERIALPORTCFG; + + +/** @name RTSerialPortOpen flags + * @{ */ +/** Open the serial port with the receiver enabled to receive data. */ +#define RTSERIALPORT_OPEN_F_READ RT_BIT(0) +/** Open the serial port with the transmitter enabled to transmit data. */ +#define RTSERIALPORT_OPEN_F_WRITE RT_BIT(1) +/** Open the serial port with status line monitoring enabled to get notified about status line changes. */ +#define RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING RT_BIT(2) +/** Open the serial port with BREAK condition detection enabled (Requires extra work on some hosts). */ +#define RTSERIALPORT_OPEN_F_DETECT_BREAK_CONDITION RT_BIT(3) +/** Open the serial port with loopback mode enabled. */ +#define RTSERIALPORT_OPEN_F_ENABLE_LOOPBACK RT_BIT(4) +/** Bitmask of valid flags. */ +#define RTSERIALPORT_OPEN_F_VALID_MASK UINT32_C(0x0000001f) +/** @} */ + + +/** @name RTSerialPortChgModemLines flags + * @{ */ +/** Change the RTS (Ready To Send) line signal. */ +#define RTSERIALPORT_CHG_STS_LINES_F_RTS RT_BIT(0) +/** Change the DTR (Data Terminal Ready) line signal. */ +#define RTSERIALPORT_CHG_STS_LINES_F_DTR RT_BIT(1) +/** Bitmask of valid flags. */ +#define RTSERIALPORT_CHG_STS_LINES_F_VALID_MASK UINT32_C(0x00000003) +/** @} */ + + +/** @name RTSerialPortQueryStatusLines flags + * @{ */ +/** The DCD (Data Carrier Detect) signal is active. */ +#define RTSERIALPORT_STS_LINE_DCD RT_BIT(0) +/** The RI (Ring Indicator) signal is active. */ +#define RTSERIALPORT_STS_LINE_RI RT_BIT(1) +/** The DSR (Data Set Ready) signal is active. */ +#define RTSERIALPORT_STS_LINE_DSR RT_BIT(2) +/** The CTS (Clear To Send) signal is active. */ +#define RTSERIALPORT_STS_LINE_CTS RT_BIT(3) +/** @} */ + + +/** @name RTSerialPortEvtPoll flags + * @{ */ +/** Data was received and can be read. */ +#define RTSERIALPORT_EVT_F_DATA_RX RT_BIT(0) +/** All data was transmitted and there is room again in the transmit buffer. */ +#define RTSERIALPORT_EVT_F_DATA_TX RT_BIT(1) +/** A BREAK condition was detected on the communication channel. + * Only available when BREAK condition detection was enabled when opening the serial port .*/ +#define RTSERIALPORT_EVT_F_BREAK_DETECTED RT_BIT(2) +/** One of the monitored status lines changed, check with RTSerialPortQueryStatusLines(). + * Only available if status line monitoring was enabled when opening the serial port. */ +#define RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED RT_BIT(3) +/** Status line monitor failed with an error and status line monitoring is disabled, + * this cannot be given in the event mask but will be set if status line + * monitoring is enabled and the monitor failed. */ +#define RTSERIALPORT_EVT_F_STATUS_LINE_MONITOR_FAILED RT_BIT(4) +/** Bitmask of valid flags. */ +#define RTSERIALPORT_EVT_F_VALID_MASK UINT32_C(0x0000001f) +/** @} */ + + +/** + * Opens a serial port with the specified flags. + * + * @returns IPRT status code. + * @param phSerialPort Where to store the IPRT serial port handle on success. + * @param pszPortAddress The address of the serial port (host dependent). + * @param fFlags Flags to open the serial port with, see RTSERIALPORT_OPEN_F_*. + */ +RTDECL(int) RTSerialPortOpen(PRTSERIALPORT phSerialPort, const char *pszPortAddress, uint32_t fFlags); + + +/** + * Closes the given serial port handle. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + */ +RTDECL(int) RTSerialPortClose(RTSERIALPORT hSerialPort); + + +/** + * Gets the native handle for an IPRT serial port handle. + * + * @returns The native handle. -1 on failure. + * @param hSerialPort The IPRT serial port handle. + */ +RTDECL(RTHCINTPTR) RTSerialPortToNative(RTSERIALPORT hSerialPort); + + +/** + * Tries to read the given number of bytes from the serial port, blocking version. + * + * @returns IPRT status code. + * @retval VERR_SERIALPORT_BREAK_DETECTED if a break was detected before the requested number of bytes was received. + * @param hSerialPort The IPRT serial port handle. + * @param pvBuf Where to store the read data. + * @param cbToRead How much to read from the serial port. + * @param pcbRead Where to store the number of bytes received until an error condition occurred, optional. + */ +RTDECL(int) RTSerialPortRead(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead); + + +/** + * Tries to read the given number of bytes from the serial port, non-blocking version. + * + * @returns IPRT status code. + * @retval VERR_SERIALPORT_BREAK_DETECTED if a break was detected before anything could be received. + * @retval VINF_TRY_AGAIN if nothing could be read. + * @param hSerialPort The IPRT serial port handle. + * @param pvBuf Where to store the read data. + * @param cbToRead How much to read from the serial port. + * @param pcbRead Where to store the number of bytes received. + */ +RTDECL(int) RTSerialPortReadNB(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead); + + +/** + * Writes the given data to the serial port, blocking version. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + * @param pvBuf The data to write. + * @param cbToWrite How much to write. + * @param pcbWritten Where to store the number of bytes written until an error condition occurred, optional. + */ +RTDECL(int) RTSerialPortWrite(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten); + + +/** + * Writes the given data to the serial port, non-blocking version. + * + * @returns IPRT status code. + * @retval VINF_TRY_AGAIN if nothing could be written. + * @param hSerialPort The IPRT serial port handle. + * @param pvBuf The data to write. + * @param cbToWrite How much to write. + * @param pcbWritten Where to store the number of bytes written. + */ +RTDECL(int) RTSerialPortWriteNB(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten); + + +/** + * Queries the current active serial port config. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + * @param pCfg Where to store the current active config. + */ +RTDECL(int) RTSerialPortCfgQueryCurrent(RTSERIALPORT hSerialPort, PRTSERIALPORTCFG pCfg); + + +/** + * Change the serial port to the given config. + * + * @returns IPRT status code. + * @retval VERR_SERIALPORT_INVALID_BAUDRATE if the baud rate is not supported on the serial port. + * @param hSerialPort The IPRT serial port handle. + * @param pCfg The config to write. + * @param pErrInfo Where to store additional information on error, optional. + */ +RTDECL(int) RTSerialPortCfgSet(RTSERIALPORT hSerialPort, PCRTSERIALPORTCFG pCfg, PRTERRINFO pErrInfo); + + +/** + * Poll for an event on the given serial port. + * + * @returns IPRT status code. + * @retval VERR_TIMEOUT if the timeout was reached before an event happened. + * @retval VERR_INTERRUPTED if another thread interrupted the polling through RTSerialPortEvtPollInterrupt(). + * @param hSerialPort The IPRT serial port handle. + * @param fEvtMask The mask of events to receive, see RTSERIALPORT_EVT_F_* + * @param pfEvtsRecv Where to store the bitmask of events received. + * @param msTimeout Number of milliseconds to wait for an event. + */ +RTDECL(int) RTSerialPortEvtPoll(RTSERIALPORT hSerialPort, uint32_t fEvtMask, uint32_t *pfEvtsRecv, + RTMSINTERVAL msTimeout); + + +/** + * Interrupt another thread currently polling for an event. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + * + * @note Any thread. + */ +RTDECL(int) RTSerialPortEvtPollInterrupt(RTSERIALPORT hSerialPort); + + +/** + * Sets or clears a BREAK condition on the given serial port. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + * @param fSet Flag whether to set the BREAK condition or clear it. + */ +RTDECL(int) RTSerialPortChgBreakCondition(RTSERIALPORT hSerialPort, bool fSet); + + +/** + * Modify the status lines of the given serial port. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + * @param fClear Combination of status lines to clear, see RTSERIALPORT_CHG_STS_LINES_F_*. + * @param fSet Combination of status lines to set, see RTSERIALPORT_CHG_STS_LINES_F_*. + * + * @note fClear takes precedence over fSet in case the same status line bit is set in both arguments. + */ +RTDECL(int) RTSerialPortChgStatusLines(RTSERIALPORT hSerialPort, uint32_t fClear, uint32_t fSet); + + +/** + * Query the status of the status lines on the given serial port. + * + * @returns IPRT status code. + * @param hSerialPort The IPRT serial port handle. + * @param pfStsLines Where to store the bitmask of active status lines on success, + * see RTSERIALPORT_STS_LINE_*. + */ +RTDECL(int) RTSerialPortQueryStatusLines(RTSERIALPORT hSerialPort, uint32_t *pfStsLines); + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_serialport_h */ + |