From e1301550bccc67c25fa9581da3b18cfefc4c601c Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Sat, 2 May 2009 09:45:24 +0000
Subject: Some work done on abstract I/O channels.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@931 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 src/include/ch.h       |   1 +
 src/include/channels.h | 117 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 src/include/channels.h

(limited to 'src/include')

diff --git a/src/include/ch.h b/src/include/ch.h
index fa11c169b..bbc0c8eb4 100644
--- a/src/include/ch.h
+++ b/src/include/ch.h
@@ -80,6 +80,7 @@
 #include "threads.h"
 #include "inline.h"
 #include "queues.h"
+#include "channels.h"
 #include "serial.h"
 #include "debug.h"
 
diff --git a/src/include/channels.h b/src/include/channels.h
new file mode 100644
index 000000000..deb01f433
--- /dev/null
+++ b/src/include/channels.h
@@ -0,0 +1,117 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 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 channels.h
+ * @brief I/O channels
+ * @addtogroup Channels
+ * @{
+ */
+
+#ifndef _CHANNELS_H_
+#define _CHANNELS_H_
+
+/**
+ * @brief Virtual methods table for base channels.
+ */
+struct _base_channel_vmt {
+  /**
+   * Channel synchronous put method.
+   */
+  msg_t (*put)(void *instance, uint8_t b, systime_t timeout);
+  /**
+   * Channel synchronous get method.
+   */
+  msg_t (*get)(void *instance, systime_t timeout);
+};
+
+/**
+ * @brief Base channels data.
+ * @note It is empty because @p BaseChannel is only an interface without
+ *       implementation.
+ */
+struct _base_channel_data {
+};
+
+/**
+ * @brief Base channel class.
+ * @details This class represents a generic, synchronous, byte-wide,
+ *          I/O channel.
+ */
+typedef struct _base_channel {
+  struct _base_channel_vmt *vmt;                /**< Virtual Methods Table. */
+  struct _base_channel_data d0;                 /**< Class data. */
+} BaseChannel;
+
+#if CH_USE_EVENTS
+/**
+ * @brief Virtual methods table for base asynchronous channels.
+ */
+struct _base_asynchronous_channel_vmt {
+  /**
+   * Channel synchronous put method.
+   */
+  msg_t (*put)(void *instance, uint8_t b, systime_t timeout);
+  /**
+   * Channel synchronous get method.
+   */
+  msg_t (*get)(void *instance, systime_t timeout);
+  /**
+   * Channel asynchronous write method.
+   */
+  size_t (*write)(void *instance, uint8_t *bp, size_t n);
+  /**
+   * Channel asynchronous read method.
+   */
+  size_t (*read)(void *instance, uint8_t *bp, size_t n);
+};
+
+/**
+ * @brief Base asynchronous channels data.
+ */
+struct _base_asynchronous_channel_data {
+  /**
+   * Data Available @p EventSource. This event is generated when some incoming
+   * data is inserted in the input queue.
+   */
+  EventSource           ievent;
+  /**
+   * Data Transmitted @p EventSource. This event is generated when the
+   * output queue is empty.
+   */
+  EventSource           oevent;
+};
+
+/**
+ * @extends BaseChannel
+ *
+ * @brief Base asynchronous channel class.
+ * @details This class extends @p BaseChannel by adding methods for
+ *          asynchronous I/O in an event-driven environment.
+ */
+typedef struct {
+  struct _base_asynchronous_channel_vmt *vmt;   /**< Virtual Methods Table. */
+  struct _base_channel_data d0;                 /**< Super class data. */
+  struct _base_asynchronous_channel_data d1;    /**< Class data. */
+} BaseAsynchronousChannel;
+#endif /* CH_USE_EVENTS */
+
+#endif /* _CHANNELS_H_ */
+
+/** @} */
-- 
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