288 lines
10 KiB
C
288 lines
10 KiB
C
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/*
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ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file hal_channels.h
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* @brief I/O channels access.
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* @details This header defines an abstract interface useful to access generic
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* I/O serial devices in a standardized way.
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*
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* @addtogroup IO_CHANNEL
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* @details This module defines an abstract interface for I/O channels by
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* extending the @p BaseSequentialStream interface.<br>
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* Note that no code is present, I/O channels are just abstract
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* interface like structures, you should look at the systems as
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* to a set of abstract C++ classes (even if written in C).
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* Specific device drivers can use/extend the interface and
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* implement them.<br>
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* This system has the advantage to make the access to channels
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* independent from the implementation logic.
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* @{
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*/
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#ifndef HAL_CHANNELS_H
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#define HAL_CHANNELS_H
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/**
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* @brief @p BaseChannel specific methods.
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*/
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#define _base_channel_methods \
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_base_sequential_stream_methods \
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/* Channel put method with timeout specification.*/ \
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msg_t (*putt)(void *instance, uint8_t b, systime_t time); \
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/* Channel get method with timeout specification.*/ \
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msg_t (*gett)(void *instance, systime_t time); \
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/* Channel write method with timeout specification.*/ \
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size_t (*writet)(void *instance, const uint8_t *bp, \
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size_t n, systime_t time); \
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/* Channel read method with timeout specification.*/ \
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size_t (*readt)(void *instance, uint8_t *bp, size_t n, systime_t time);
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/**
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* @brief @p BaseChannel specific data.
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* @note It is empty because @p BaseChannel is only an interface without
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* implementation.
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*/
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#define _base_channel_data \
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_base_sequential_stream_data
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/**
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* @extends BaseSequentialStreamVMT
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*
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* @brief @p BaseChannel virtual methods table.
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*/
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struct BaseChannelVMT {
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_base_channel_methods
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};
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/**
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* @extends BaseSequentialStream
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*
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* @brief Base channel class.
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* @details This class represents a generic, byte-wide, I/O channel. This class
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* introduces generic I/O primitives with timeout specification.
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*/
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typedef struct {
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/** @brief Virtual Methods Table.*/
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const struct BaseChannelVMT *vmt;
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_base_channel_data
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} BaseChannel;
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/**
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* @name Macro Functions (BaseChannel)
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* @{
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*/
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/**
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* @brief Channel blocking byte write with timeout.
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* @details This function writes a byte value to a channel. If the channel
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* is not ready to accept data then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p BaseChannel or derived class
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* @param[in] b the byte value to be written to the channel
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* @param[in] time the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_IMMEDIATE immediate timeout.
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The operation status.
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* @retval STM_OK if the operation succeeded.
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* @retval STM_TIMEOUT if the specified time expired.
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* @retval STM_RESET if the channel associated queue (if any) was reset.
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*
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* @api
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*/
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#define chnPutTimeout(ip, b, time) ((ip)->vmt->putt(ip, b, time))
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/**
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* @brief Channel blocking byte read with timeout.
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* @details This function reads a byte value from a channel. If the data
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* is not available then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p BaseChannel or derived class
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* @param[in] time the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_IMMEDIATE immediate timeout.
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* - @a TIME_INFINITE no timeout.
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* .
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* @return A byte value from the queue.
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* @retval STM_TIMEOUT if the specified time expired.
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* @retval STM_RESET if the channel associated queue (if any) has been
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* reset.
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*
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* @api
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*/
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#define chnGetTimeout(ip, time) ((ip)->vmt->gett(ip, time))
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/**
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* @brief Channel blocking write.
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* @details The function writes data from a buffer to a channel. If the channel
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* is not ready to accept data then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p BaseChannel or derived class
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* @param[out] bp pointer to the data buffer
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* @param[in] n the maximum amount of data to be transferred
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*
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* @return The number of bytes transferred.
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*
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* @api
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*/
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#define chnWrite(ip, bp, n) streamWrite(ip, bp, n)
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/**
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* @brief Channel blocking write with timeout.
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* @details The function writes data from a buffer to a channel. If the channel
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* is not ready to accept data then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p BaseChannel or derived class
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* @param[out] bp pointer to the data buffer
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* @param[in] n the maximum amount of data to be transferred
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* @param[in] time the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_IMMEDIATE immediate timeout.
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The number of bytes transferred.
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*
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* @api
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*/
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#define chnWriteTimeout(ip, bp, n, time) ((ip)->vmt->writet(ip, bp, n, time))
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/**
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* @brief Channel blocking read.
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* @details The function reads data from a channel into a buffer. If the data
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* is not available then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p BaseChannel or derived class
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* @param[in] bp pointer to the data buffer
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* @param[in] n the maximum amount of data to be transferred
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*
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* @return The number of bytes transferred.
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*
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* @api
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*/
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#define chnRead(ip, bp, n) streamRead(ip, bp, n)
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/**
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* @brief Channel blocking read with timeout.
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* @details The function reads data from a channel into a buffer. If the data
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* is not available then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p BaseChannel or derived class
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* @param[in] bp pointer to the data buffer
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* @param[in] n the maximum amount of data to be transferred
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* @param[in] time the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_IMMEDIATE immediate timeout.
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The number of bytes transferred.
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*
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* @api
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*/
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#define chnReadTimeout(ip, bp, n, time) ((ip)->vmt->readt(ip, bp, n, time))
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/** @} */
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/**
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* @name I/O status flags added to the event listener
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* @{
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*/
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/** @brief No pending conditions.*/
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#define CHN_NO_ERROR (eventflags_t)0
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/** @brief Connection happened.*/
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#define CHN_CONNECTED (eventflags_t)1
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/** @brief Disconnection happened.*/
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#define CHN_DISCONNECTED (eventflags_t)2
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/** @brief Data available in the input queue.*/
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#define CHN_INPUT_AVAILABLE (eventflags_t)4
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/** @brief Output queue empty.*/
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#define CHN_OUTPUT_EMPTY (eventflags_t)8
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/** @brief Transmission end.*/
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#define CHN_TRANSMISSION_END (eventflags_t)16
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/** @} */
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/**
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* @brief @p BaseAsynchronousChannel specific methods.
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*/
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#define _base_asynchronous_channel_methods \
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_base_channel_methods \
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/**
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* @brief @p BaseAsynchronousChannel specific data.
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*/
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#define _base_asynchronous_channel_data \
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_base_channel_data \
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/* I/O condition event source.*/ \
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event_source_t event;
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/**
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* @extends BaseChannelVMT
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*
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* @brief @p BaseAsynchronousChannel virtual methods table.
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*/
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struct BaseAsynchronousChannelVMT {
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_base_asynchronous_channel_methods
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};
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/**
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* @extends BaseChannel
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*
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* @brief Base asynchronous channel class.
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* @details This class extends @p BaseChannel by adding event sources fields
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* for asynchronous I/O for use in an event-driven environment.
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*/
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typedef struct {
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/** @brief Virtual Methods Table.*/
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const struct BaseAsynchronousChannelVMT *vmt;
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_base_asynchronous_channel_data
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} BaseAsynchronousChannel;
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/**
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* @name Macro Functions (BaseAsynchronousChannel)
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* @{
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*/
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/**
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* @brief Returns the I/O condition event source.
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* @details The event source is broadcasted when an I/O condition happens.
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*
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* @param[in] ip pointer to a @p BaseAsynchronousChannel or derived
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* class
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* @return A pointer to an @p EventSource object.
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*
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* @api
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*/
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#define chnGetEventSource(ip) (&((ip)->event))
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/**
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* @brief Adds status flags to the listeners's flags mask.
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* @details This function is usually called from the I/O ISRs in order to
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* notify I/O conditions such as data events, errors, signal
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* changes etc.
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*
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* @param[in] ip pointer to a @p BaseAsynchronousChannel or derived
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* class
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* @param[in] flags condition flags to be added to the listener flags mask
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*
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* @iclass
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*/
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#define chnAddFlagsI(ip, flags) { \
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osalEventBroadcastFlagsI(&(ip)->event, flags); \
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}
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/** @} */
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#endif /* HAL_CHANNELS_H */
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/** @} */
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