初始版本

2026-04-23 13:49:53 +08:00
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+/*
+ * Copyright (c) 2025, Your Name.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is an extension to the protothreads library.
+ *
+ * Author: Your Name <your.email@example.com>
+ */
+
+#ifndef __PT_EXT_H__
+#define __PT_EXT_H__
+
+#include "pt.h"
+#include "limits.h"
+
+#define PT_WAIT_STAT_SUCC    (0 )
+#define PT_WAIT_STAT_TIMEOUT (-2)
+
+/**
+ * \addtogroup pt
+ * @{
+ */
+
+/**
+ * Increment the system tick counter.
+ *
+ * This macro increments the global tick counter. It should be called
+ * from a system tick interrupt or similar context.
+ */
+
+ void pt_ticks_inc(void);
+
+/**
+ * Get the current system tick counter.
+ *
+ * \return The current tick count.
+ */
+unsigned int pt_ticks_get(void);
+
+
+
+/**
+ * Delay for a specified number of milliseconds.
+ *
+ * This macro blocks the protothread for the specified number of
+ * milliseconds. The delay is implemented using the global tick counter.
+ *
+ * \param pt A pointer to the protothread control structure.
+ * \param ms The number of milliseconds to delay.
+ */
+/**
+ * Check if timeout has occurred, handling tick counter overflow.
+ *
+ * \param start The start tick count
+ * \param end The end tick count
+ * \param timeout The timeout value in ticks
+ * \return 1 if timeout occurred, 0 otherwise
+ */
+int pt_is_timeout(unsigned int start, unsigned int end, unsigned int timeout);
+
+#define PT_DELAY_MS(pt, ms) \
+    do { \
+        static unsigned int _pt_delay_start=0; \
+        _pt_delay_start = pt_ticks_get(); \
+        PT_WAIT_UNTIL((pt), pt_is_timeout(_pt_delay_start, pt_ticks_get(), ms)); \
+    } while (0)
+
+#define PT_WAIT(pt, c, timeout, result) \
+    do { \
+        static unsigned int _pt_wait_start = 0;\
+        _pt_wait_start = pt_ticks_get(); \
+        *result = -1; \
+        PT_WAIT_UNTIL((pt), (c) || pt_is_timeout(_pt_wait_start, pt_ticks_get(), timeout)); \
+        if (c) { *result = 0; };\
+        if (pt_is_timeout(_pt_wait_start, pt_ticks_get(), timeout)) { *result = -2;};\
+    }while (0)
+
+/** @} */
+/** @} */
+
+#endif /* __PT_EXT_H__ */