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/**
* \file
*
* \brief ARM functions for busy-wait delay loops
*
* Copyright (c) 2014-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* 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. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifndef _cycle_counter_h_
#define _cycle_counter_h_
#ifdef __cplusplus
extern "C" {
#endif
#include <compiler.h>
/**
* @name Convenience functions for busy-wait delay loops
*
* @def delay_cycles
* @brief Delay program execution for a specified number of CPU cycles.
* @param n number of CPU cycles to wait
*
* @def cpu_delay_ms
* @brief Delay program execution for a specified number of milliseconds.
* @param delay number of milliseconds to wait
* @param f_cpu CPU frequency in Hertz
*
* @def cpu_delay_us
* @brief Delay program execution for a specified number of microseconds.
* @param delay number of microseconds to wait
* @param f_cpu CPU frequency in Hertz
*
* @def cpu_ms_2_cy
* @brief Convert milli-seconds into CPU cycles.
* @param ms number of milliseconds
* @param f_cpu CPU frequency in Hertz
* @return the converted number of CPU cycles
*
* @def cpu_us_2_cy
* @brief Convert micro-seconds into CPU cycles.
* @param ms number of microseconds
* @param f_cpu CPU frequency in Hertz
* @return the converted number of CPU cycles
*
* @{
*/
/**
* \brief Delay loop to delay n number of cycles
*
* \note The function runs in internal RAM so that flash wait states
* will not affect the delay time.
*
* \param n Number of cycles
*/
void portable_delay_cycles(unsigned long n);
/* Cortex-M7 is faster than Cortex-M3/M4/M0+ */
#ifdef __CM7_REV
# define cpu_ms_2_cy(ms, f_cpu) \
(((uint64_t)(ms) * (f_cpu) + (uint64_t)(5.932e3 - 1ul)) / (uint64_t)5.932e3)
# define cpu_us_2_cy(us, f_cpu) \
(((uint64_t)(us) * (f_cpu) + (uint64_t)(5.932e6 - 1ul)) / (uint64_t)5.932e6)
#else
# define cpu_ms_2_cy(ms, f_cpu) \
(((uint64_t)(ms) * (f_cpu) + (uint64_t)(14e3 - 1ul)) / (uint64_t)14e3)
# define cpu_us_2_cy(us, f_cpu) \
(((uint64_t)(us) * (f_cpu) + (uint64_t)(14e6 - 1ul)) / (uint64_t)14e6)
#endif
#define delay_cycles portable_delay_cycles
#define cpu_delay_ms(delay, f_cpu) delay_cycles(cpu_ms_2_cy(delay, f_cpu))
#define cpu_delay_us(delay, f_cpu) delay_cycles(cpu_us_2_cy(delay, f_cpu))
//! @}
#ifdef __cplusplus
}
#endif
#endif /* _cycle_counter_h_ */
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