diff options
| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2012-05-07 18:43:52 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2012-05-07 18:43:52 +0000 |
| commit | 6ee956d7b6cf775fd85c51347b75e39daa412d38 (patch) | |
| tree | 7a8d19d387c449d7abff0ba208dde3ab677cd075 /os | |
| parent | de3f32e40598208e387c6fa8963ed0176404c211 (diff) | |
| download | ChibiOS-6ee956d7b6cf775fd85c51347b75e39daa412d38.tar.gz ChibiOS-6ee956d7b6cf775fd85c51347b75e39daa412d38.tar.bz2 ChibiOS-6ee956d7b6cf775fd85c51347b75e39daa412d38.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4171 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os')
| -rw-r--r-- | os/hal/include/io_block.h | 213 | ||||
| -rw-r--r-- | os/hal/include/io_serial.h | 368 | ||||
| -rw-r--r-- | os/hal/include/sdc.h | 4 | ||||
| -rw-r--r-- | os/hal/src/sdc.c | 16 | ||||
| -rw-r--r-- | os/kernel/include/chioch.h | 4 | ||||
| -rw-r--r-- | os/kernel/include/chstreams.h | 10 |
6 files changed, 598 insertions, 17 deletions
diff --git a/os/hal/include/io_block.h b/os/hal/include/io_block.h new file mode 100644 index 000000000..20c2e991c --- /dev/null +++ b/os/hal/include/io_block.h @@ -0,0 +1,213 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file io_block.h
+ * @brief I/O block devices access.
+ * @details This header defines abstract interfaces useful to access generic
+ * I/O block devices in a standardized way.
+ *
+ * @addtogroup IO_BLOCK
+ * @details This module define an abstract interface for accessing generic
+ * block devices.
+ * Note that no code is present, just abstract interfaces-like
+ * structures, you should look at the system as to a set of
+ * abstract C++ classes (even if written in C). This system
+ * has then advantage to make the access to block devices
+ * independent from the implementation logic.
+ * @{
+ */
+
+#ifndef _IO_BLOCK_H_
+#define _IO_BLOCK_H_
+
+/**
+ * @brief Block device info.
+ */
+typedef struct {
+ uint32_t blk_size; /**< @brief Block size in bytes. */
+ uint32_t blk_num; /**< @brief Total number of blocks. */
+} BlockDeviceInfo;
+
+/**
+ * @brief @p BaseBlockDevice specific methods.
+ */
+#define _base_block_device_methods \
+ /* Removable media detection.*/ \
+ bool_t is_inserted(void *instance); \
+ /* Removable write protection detection.*/ \
+ bool_t is_protected(void *instance); \
+ /* Connection to the block device.*/ \
+ bool_t (*connect)(void *instance); \
+ /* Disconnection from the block device.*/ \
+ bool_t (*disconnect)(void *instance); \
+ /* Reads one or more blocks.*/ \
+ bool_t (*read)(void *instance, uint32_t startblk, \
+ uint8_t *buffer, uint32_t n); \
+ /* Writes one or more blocks.*/ \
+ bool_t (*write)(void *instance, uint32_t startblk, \
+ const uint8_t *buffer, uint32_t n); \
+ /* Write operations synchronization.*/ \
+ bool_t (*sync)(void *instance); \
+ /* Obtains info about the media.*/ \
+ bool_t (*get_info)(void *instance, BlockDeviceInfo *bdip);
+
+/**
+ * @brief @p BaseBlockDevice specific data.
+ * @note It is empty because @p BaseBlockDevice is only an interface
+ * without implementation.
+ */
+#define _base_block_device_data
+
+/**
+ * @brief @p BaseBlockDevice virtual methods table.
+ */
+struct BaseBlockDeviceVMT {
+ _base_block_device_methods
+};
+
+/**
+ * @brief Base block device class.
+ * @details This class represents a generic, block-accessible, device.
+ */
+typedef struct {
+ /** @brief Virtual Methods Table.*/
+ const struct BaseBlockDeviceVMT *vmt;
+ _base_block_device_data
+} BaseBlockDevice;
+
+/**
+ * @name Macro Functions (BaseBlockDevice)
+ * @{
+ */
+/**
+ * @brief Returns the media insertion status.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ *
+ * @return The media state.
+ * @retval FALSE media not inserted.
+ * @retval TRUE media inserted.
+ *
+ * @api
+ */
+#define blkIsInserted(ip) ((ip)->vmt->is_inserted(ip))
+
+/**
+ * @brief Returns the media write protection status.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ *
+ * @return The media state.
+ * @retval FALSE writable media.
+ * @retval TRUE non writable media.
+ *
+ * @api
+ */
+#define blkIsWriteProtected(ip) ((ip)->vmt->is_protected(ip))
+
+/**
+ * @brief Performs the initialization procedure on the block device.
+ * @details This function should be performed before I/O operations can be
+ * attempted on the block device and after insertion has been
+ * confirmed using @p blkIsInserted().
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ *
+ * @return The operation status.
+ * @retval FALSE operation succeeded.
+ * @retval TRUE operation failed.
+ *
+ * @api
+ */
+#define blkConnect(ip) ((ip)->vmt->connect(ip))
+
+/**
+ * @brief Terminates operations on the block device.
+ * @details This operation safely terminates operations on the block device.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ *
+ * @return The operation status.
+ * @retval FALSE operation succeeded.
+ * @retval TRUE operation failed.
+ *
+ * @api
+ */
+#define blkDisconnect(ip) ((ip)->vmt-disconnect(ip))
+
+/**
+ * @brief Reads one or more blocks.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ * @param[in] startblk first block to read
+ * @param[out] buf pointer to the read buffer
+ * @param[in] n number of blocks to read
+ *
+ * @return The operation status.
+ * @retval FALSE operation succeeded.
+ * @retval TRUE operation failed.
+ *
+ * @api
+ */
+#define blkRead(ip, startblk, buffer, n) \
+ ((ip)->vmt->read(ip, startblk, buffer, n))
+
+/**
+ * @brief Writes one or more blocks.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ * @param[in] startblk first block to write
+ * @param[out] buf pointer to the write buffer
+ * @param[in] n number of blocks to write
+ *
+ * @return The operation status.
+ * @retval FALSE operation succeeded.
+ * @retval TRUE operation failed.
+ *
+ * @api
+ */
+#define blkWrite(ip, startblk, buffer, n) \
+ ((ip)->vmt->write(ip, startblk, buffer, n))
+
+/**
+ * @brief Ensures write synchronization.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ *
+ * @api
+ */
+#define blkSync(ip) ((ip)->vmt->sync(ip))
+
+/**
+ * @brief Returns a media information structure.
+ *
+ * @param[in] ip pointer to a @p BaseBlockDevice or derived class
+ * @param[out] bdpi pointer to a @p BlockDeviceInfo structure
+ *
+ * @api
+ */
+#define blkGetInfo(ip, bdip) ((ip)->vmt->get_info(ip, bdip))
+
+/** @} */
+
+#endif /* _IO_BLOCK_H_ */
+
+/** @} */
diff --git a/os/hal/include/io_serial.h b/os/hal/include/io_serial.h new file mode 100644 index 000000000..f6be5dad3 --- /dev/null +++ b/os/hal/include/io_serial.h @@ -0,0 +1,368 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file io_serial.h
+ * @brief I/O serial devices access.
+ * @details This header defines abstract interfaces useful to access generic
+ * I/O serial devices in a standardized way.
+ *
+ * @addtogroup IO_SERIAL
+ * @details This module defines an abstract interface for I/O channels by
+ * extending the @p BaseSequentialStream interface. Note that no code
+ * is present, I/O channels are just abstract interface like
+ * structures, you should look at the systems as to a set of abstract
+ * C++ classes (even if written in C). Specific device drivers can
+ * use/extend the interface and implement them.<br>
+ * This system has the advantage to make the access to channels
+ * independent from the implementation logic.
+ * @{
+ */
+
+#ifndef _IO_SERIAL_H_
+#define _IO_SERIAL_H_
+
+/**
+ * @brief @p BaseChannel specific methods.
+ */
+#define _base_channel_methods \
+ _base_sequential_stream_methods \
+ /* Channel output check.*/ \
+ bool_t (*putwouldblock)(void *instance); \
+ /* Channel input check.*/ \
+ bool_t (*getwouldblock)(void *instance); \
+ /* Channel put method with timeout specification.*/ \
+ msg_t (*put)(void *instance, uint8_t b, systime_t time); \
+ /* Channel get method with timeout specification.*/ \
+ msg_t (*get)(void *instance, systime_t time); \
+ /* Channel write method with timeout specification.*/ \
+ size_t (*writet)(void *instance, const uint8_t *bp, \
+ size_t n, systime_t time); \
+ /* Channel read method with timeout specification.*/ \
+ size_t (*readt)(void *instance, uint8_t *bp, size_t n, systime_t time);
+
+/**
+ * @brief @p BaseChannel specific data.
+ * @note It is empty because @p BaseChannel is only an interface without
+ * implementation.
+ */
+#define _base_channel_data \
+ _base_sequential_stream_data
+
+/**
+ * @extends BaseSequentialStreamVMT
+ *
+ * @brief @p BaseChannel virtual methods table.
+ */
+struct BaseChannelVMT {
+ _base_channel_methods
+};
+
+/**
+ * @extends BaseSequentialStream
+ *
+ * @brief Base channel class.
+ * @details This class represents a generic, byte-wide, I/O channel. This class
+ * introduces generic I/O primitives with timeout specification.
+ */
+typedef struct {
+ /** @brief Virtual Methods Table.*/
+ const struct BaseChannelVMT *vmt;
+ _base_channel_data
+} BaseChannel;
+
+/**
+ * @name Macro Functions (BaseChannel)
+ * @{
+ */
+/**
+ * @brief Channel output check.
+ * @details This function verifies if a subsequent put/write operation would
+ * block.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @return The output queue status.
+ * @retval FALSE if the output queue has space and would not block a
+ * write operation.
+ * @retval TRUE if the output queue is full and would block a write
+ * operation.
+ *
+ * @api
+ */
+#define srlPutWouldBlock(ip) ((ip)->vmt->putwouldblock(ip))
+
+/**
+ * @brief Channel input check.
+ * @details This function verifies if a subsequent get/read operation would
+ * block.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @return The input queue status.
+ * @retval FALSE if the input queue contains data and would not block a
+ * read operation.
+ * @retval TRUE if the input queue is empty and would block a read
+ * operation.
+ *
+ * @api
+ */
+#define srlGetWouldBlock(ip) ((ip)->vmt->getwouldblock(ip))
+
+/**
+ * @brief Channel blocking byte write.
+ * @details This function writes a byte value to a channel. If the channel
+ * is not ready to accept data then the calling thread is suspended.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @param[in] b the byte value to be written to the channel
+ * @return The operation status.
+ * @retval Q_OK if the operation succeeded.
+ * @retval Q_RESET if the channel associated queue (if any) was reset.
+ *
+ * @api
+ */
+#define srlPut(ip, b) ((ip)->vmt->put(ip, b, TIME_INFINITE))
+
+/**
+ * @brief Channel blocking byte write with timeout.
+ * @details This function writes a byte value to a channel. If the channel
+ * is not ready to accept data then the calling thread is suspended.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @param[in] b the byte value to be written to the channel
+ * @param[in] time the number of ticks before the operation timeouts,
+ * the following special values are allowed:
+ * - @a TIME_IMMEDIATE immediate timeout.
+ * - @a TIME_INFINITE no timeout.
+ * .
+ * @return The operation status.
+ * @retval Q_OK if the operation succeeded.
+ * @retval Q_TIMEOUT if the specified time expired.
+ * @retval Q_RESET if the channel associated queue (if any) was reset.
+ *
+ * @api
+ */
+#define srlPutTimeout(ip, b, time) ((ip)->vmt->put(ip, b, time))
+
+/**
+ * @brief Channel blocking byte read.
+ * @details This function reads a byte value from a channel. If the data
+ * is not available then the calling thread is suspended.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @return A byte value from the queue.
+ * @retval Q_RESET if the channel associated queue (if any) has been
+ * reset.
+ *
+ * @api
+ */
+#define srlGet(ip) ((ip)->vmt->get(ip, TIME_INFINITE))
+
+/**
+ * @brief Channel blocking byte read with timeout.
+ * @details This function reads a byte value from a channel. If the data
+ * is not available then the calling thread is suspended.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @param[in] time the number of ticks before the operation timeouts,
+ * the following special values are allowed:
+ * - @a TIME_IMMEDIATE immediate timeout.
+ * - @a TIME_INFINITE no timeout.
+ * .
+ * @return A byte value from the queue.
+ * @retval Q_TIMEOUT if the specified time expired.
+ * @retval Q_RESET if the channel associated queue (if any) has been
+ * reset.
+ *
+ * @api
+ */
+#define srlGetTimeout(ip, time) ((ip)->vmt->get(ip, time))
+
+/**
+ * @brief Channel blocking write with timeout.
+ * @details The function writes data from a buffer to a channel. If the channel
+ * is not ready to accept data then the calling thread is suspended.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @param[out] bp pointer to the data buffer
+ * @param[in] n the maximum amount of data to be transferred
+ * @param[in] time the number of ticks before the operation timeouts,
+ * the following special values are allowed:
+ * - @a TIME_IMMEDIATE immediate timeout.
+ * - @a TIME_INFINITE no timeout.
+ * .
+ * @return The number of bytes transferred.
+ *
+ * @api
+ */
+#define srlWriteTimeout(ip, bp, n, time) ((ip)->vmt->writet(ip, bp, n, time))
+
+/**
+ * @brief Channel blocking read with timeout.
+ * @details The function reads data from a channel into a buffer. If the data
+ * is not available then the calling thread is suspended.
+ *
+ * @param[in] ip pointer to a @p BaseChannel or derived class
+ * @param[in] bp pointer to the data buffer
+ * @param[in] n the maximum amount of data to be transferred
+ * @param[in] time the number of ticks before the operation timeouts,
+ * the following special values are allowed:
+ * - @a TIME_IMMEDIATE immediate timeout.
+ * - @a TIME_INFINITE no timeout.
+ * .
+ * @return The number of bytes transferred.
+ *
+ * @api
+ */
+#define srlReadTimeout(ip, bp, n, time) ((ip)->vmt->readt(ip, bp, n, time))
+/** @} */
+
+#if CH_USE_EVENTS || defined(__DOXYGEN__)
+/**
+ * @name I/O status flags
+ * @{
+ */
+/** @brief No pending conditions.*/
+#define IO_NO_ERROR 0
+/** @brief Connection happened.*/
+#define IO_CONNECTED 1
+/** @brief Disconnection happened.*/
+#define IO_DISCONNECTED 2
+/** @brief Data available in the input queue.*/
+#define IO_INPUT_AVAILABLE 4
+/** @brief Output queue empty.*/
+#define IO_OUTPUT_EMPTY 8
+/** @brief Transmission end.*/
+#define IO_TRANSMISSION_END 16
+/** @} */
+
+/**
+ * @brief Type of an I/O condition flags mask.
+ */
+typedef uint_fast16_t ioflags_t;
+
+/**
+ * @brief @p BaseAsynchronousChannel specific methods.
+ */
+#define _base_asynchronous_channel_methods \
+ _base_channel_methods \
+ /* Channel read method with timeout specification.*/ \
+ ioflags_t (*getflags)(void *instance);
+
+/**
+ * @brief @p BaseAsynchronousChannel specific data.
+ */
+#define _base_asynchronous_channel_data \
+ _base_channel_data \
+ /* I/O condition event source.*/ \
+ EventSource event; \
+ /* I/O condition flags.*/ \
+ ioflags_t flags;
+
+/**
+ * @extends BaseChannelVMT
+ *
+ * @brief @p BaseAsynchronousChannel virtual methods table.
+ */
+struct BaseAsynchronousChannelVMT {
+ _base_asynchronous_channel_methods
+};
+
+/**
+ * @extends BaseChannel
+ *
+ * @brief Base asynchronous channel class.
+ * @details This class extends @p BaseChannel by adding event sources fields
+ * for asynchronous I/O for use in an event-driven environment.
+ */
+typedef struct {
+ /** @brief Virtual Methods Table.*/
+ const struct BaseAsynchronousChannelVMT *vmt;
+ _base_asynchronous_channel_data
+} BaseAsynchronousChannel;
+
+/**
+ * @name Macro Functions (BaseAsynchronousChannel)
+ * @{
+ */
+/**
+ * @brief Returns the I/O condition event source.
+ * @details The event source is broadcasted when an I/O condition happens.
+ *
+ * @param[in] ip pointer to a @p BaseAsynchronousChannel or derived
+ * class
+ * @return A pointer to an @p EventSource object.
+ *
+ * @api
+ */
+#define srlGetEventSource(ip) (&((ip)->event))
+
+/**
+ * @brief Adds status flags to the channel's mask.
+ * @details This function is usually called from the I/O ISRs in order to
+ * notify I/O conditions such as data events, errors, signal
+ * changes etc.
+ *
+ * @param[in] ip pointer to a @p BaseAsynchronousChannel or derived
+ * class
+ * @param[in] mask condition flags to be added to the mask
+ *
+ * @iclass
+ */
+#define srlAddFlagsI(ip, mask) { \
+ (ip)->flags |= (mask); \
+ chEvtBroadcastI(&(ip)->event); \
+}
+
+/**
+ * @brief Returns and clears the status flags associated to the channel.
+ *
+ * @param[in] ip pointer to a @p BaseAsynchronousChannel or derived
+ * class
+ * @return The condition flags modified since last time this
+ * function was invoked.
+ *
+ * @api
+ */
+#define srlGetAndClearFlags(ip) ((ip)->vmt->getflags(ip))
+/** @} */
+
+/**
+ * @brief Default implementation of the @p getflags virtual method.
+ *
+ * @param[in] ip pointer to a @p BaseAsynchronousChannel or derived
+ * class
+ * @return The condition flags modified since last time this
+ * function was invoked.
+ *
+ * @notapi
+ */
+#define _ser_get_and_clear_flags_impl(ip) \
+ ioflags_t mask; \
+ chSysLock(); \
+ mask = ((BaseAsynchronousChannel *)(ip))->flags; \
+ ((BaseAsynchronousChannel *)(ip))->flags = IO_NO_ERROR; \
+ chSysUnlock(); \
+ return mask
+
+#endif /* CH_USE_EVENTS */
+
+#endif /* _IO_SERIAL_H_ */
+
+/** @} */
diff --git a/os/hal/include/sdc.h b/os/hal/include/sdc.h index f5051731e..82b083125 100644 --- a/os/hal/include/sdc.h +++ b/os/hal/include/sdc.h @@ -232,8 +232,8 @@ typedef enum { *
* @param[in] sdcp pointer to the @p SDCDriver object
* @return The card state.
- * @retval FALSE card not inserted.
- * @retval TRUE card inserted.
+ * @retval FALSE not write protected.
+ * @retval TRUE write protected.
*
* @api
*/
diff --git a/os/hal/src/sdc.c b/os/hal/src/sdc.c index 3d0d495bb..6e9dcabd4 100644 --- a/os/hal/src/sdc.c +++ b/os/hal/src/sdc.c @@ -204,8 +204,8 @@ void sdcStop(SDCDriver *sdcp) { * @param[in] sdcp pointer to the @p SDCDriver object
*
* @return The operation status.
- * @retval FALSE operation succeeded.
- * @retval TRUE operation failed.
+ * @retval CH_FAILED operation succeeded.
+ * @retval CH_SUCCESS operation failed.
*
* @api
*/
@@ -365,8 +365,8 @@ failed: * @param[in] sdcp pointer to the @p SDCDriver object
*
* @return The operation status.
- * @retval FALSE operation succeeded.
- * @retval TRUE operation failed.
+ * @retval CH_FAILED operation succeeded.
+ * @retval CH_SUCCESS operation failed.
*
* @api
*/
@@ -406,8 +406,8 @@ bool_t sdcDisconnect(SDCDriver *sdcp) { * @param[in] n number of blocks to read
*
* @return The operation status.
- * @retval FALSE operation succeeded.
- * @retval TRUE operation failed.
+ * @retval CH_FAILED operation succeeded.
+ * @retval CH_SUCCESS operation failed.
*
* @api
*/
@@ -443,8 +443,8 @@ bool_t sdcRead(SDCDriver *sdcp, uint32_t startblk, * @param[in] n number of blocks to write
*
* @return The operation status.
- * @retval FALSE operation succeeded.
- * @retval TRUE operation failed.
+ * @retval CH_FAILED operation succeeded.
+ * @retval CH_SUCCESS operation failed.
*
* @api
*/
diff --git a/os/kernel/include/chioch.h b/os/kernel/include/chioch.h index 27e2abbb4..d8e8771f6 100644 --- a/os/kernel/include/chioch.h +++ b/os/kernel/include/chioch.h @@ -71,8 +71,8 @@ *
* @brief @p BaseChannel virtual methods table.
*/
-struct BaseChannelVMT { \
- _base_channel_methods \
+struct BaseChannelVMT {
+ _base_channel_methods
};
/**
diff --git a/os/kernel/include/chstreams.h b/os/kernel/include/chstreams.h index 3911c91ae..f12c662cd 100644 --- a/os/kernel/include/chstreams.h +++ b/os/kernel/include/chstreams.h @@ -26,11 +26,11 @@ *
* @addtogroup data_streams
* @details This module define an abstract interface for generic data streams.
- * Note that no code is present, streams are just abstract interfaces
- * like structures, you should look at the systems as to a set of
- * abstract C++ classes (even if written in C). This system has the
- * advantage to make the access to streams independent from the
- * implementation logic.<br>
+ * Note that no code is present, just abstract interfaces-like
+ * structures, you should look at the system as to a set of
+ * abstract C++ classes (even if written in C). This system
+ * has then advantage to make the access to data streams
+ * independent from the implementation logic.<br>
* The stream interface can be used as base class for high level
* object types such as files, sockets, serial ports, pipes etc.
* @{
|