OVMS3-idf/components/esp32/include/xtensa/xos_stopwatch.h

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2016-08-17 15:08:22 +00:00
/** @file */
// xos_stopwatch.h - XOS Stopwatch objects and related API.
// Copyright (c) 2003-2015 Cadence Design Systems, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// NOTE: Do not include this file directly in your application. Including
// xos.h will automatically include this file.
#ifndef __XOS_STOPWATCH_H__
#define __XOS_STOPWATCH_H__
#ifdef __cplusplus
extern "C" {
#endif
#include "xos_types.h"
#include "xos_params.h"
//-----------------------------------------------------------------------------
// A stopwatch object can be used to track elapsed time and accumulate total
// elapsed time over multiple execution periods. The stopwatch records the
// time whenever its start function is called, and stops recording the time
// when the stop function is called and updates its cumulative time counter.
// The stopwatch keeps time in cycles. This can be converted to seconds etc.
// by using the XOS conversion calls such as xos_cycles_to_secs().
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
///
/// XosStopwatch object.
///
//-----------------------------------------------------------------------------
typedef struct XosStopwatch {
uint64_t total; ///< Total accumulated cycle count
uint64_t start; ///< Starting system cycle count
uint16_t active; ///< Active flag (nonzero when active)
} XosStopwatch;
//-----------------------------------------------------------------------------
///
/// Initialize a stopwatch object.
///
/// \param sw Pointer to a stopwatch object.
///
/// \return Returns nothing.
///
//-----------------------------------------------------------------------------
static inline void
xos_stopwatch_init(XosStopwatch * sw)
{
sw->total = 0;
sw->start = 0;
sw->active = 0;
}
//-----------------------------------------------------------------------------
///
/// Start a stopwatch. Starts cycle counting.
/// Note that this does not necessarily start counting from zero. The current
/// run (start-to-stop interval) will just get added to the accumulated count
/// in the stopwatch if any.
/// To reset the accumulated count, use xos_stopwatch_clear().
///
/// \param sw Pointer to a stopwatch object.
///
/// \return Returns nothing.
///
//-----------------------------------------------------------------------------
static inline void
xos_stopwatch_start(XosStopwatch * sw)
{
XOS_ASSERT(!sw->active);
sw->active = 1;
sw->start = xos_get_system_cycles();
}
//-----------------------------------------------------------------------------
///
/// Stop a stopwatch. Stops cycle counting and updates total.
///
/// \param sw Pointer to a stopwatch object.
///
/// \return Returns nothing.
///
//-----------------------------------------------------------------------------
static inline void
xos_stopwatch_stop(XosStopwatch * sw)
{
XOS_ASSERT(sw->active);
sw->active = 0;
sw->total += xos_get_system_cycles() - sw->start;
}
//-----------------------------------------------------------------------------
///
/// Get stopwatch accumulated count.
///
/// \param sw Pointer to a stopwatch object.
///
/// \return Returns the accumulated count.
///
//-----------------------------------------------------------------------------
static inline uint64_t
xos_stopwatch_count(XosStopwatch * sw)
{
return sw->total;
}
//-----------------------------------------------------------------------------
///
/// Get elapsed time since stopwatch was started. If not started, returns zero.
///
/// \param sw Pointer to a stopwatch object.
///
/// \return Returns elapsed time in cycles.
///
//-----------------------------------------------------------------------------
static inline uint64_t
xos_stopwatch_elapsed(XosStopwatch * sw)
{
return sw->active ? xos_get_system_cycles() - sw->start : 0;
}
//-----------------------------------------------------------------------------
///
/// Clears a stopwatch. Resets the accumulated count to zero, and deactivates
/// it if active.
///
/// \param sw Pointer to a stopwatch object.
///
/// \return Returns nothing.
///
//-----------------------------------------------------------------------------
static inline void
xos_stopwatch_clear(XosStopwatch * sw)
{
xos_stopwatch_init(sw);
}
#ifdef __cplusplus
}
#endif
#endif // __XOS_STOPWATCH_H__