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120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/**
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* \file
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*
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* \brief AVR functions for busy-wait delay loops
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*
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* Copyright (c) 2011-2016 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#ifndef _CYCLE_COUNTER_H_
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#define _CYCLE_COUNTER_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <compiler.h>
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/**
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* @name Convenience functions for busy-wait delay loops
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*
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* @def delay_cycles
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* @brief Delay program execution for a specified number of CPU cycles.
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* @param n number of CPU cycles to wait
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*
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* @def cpu_delay_ms
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* @brief Delay program execution for a specified number of milliseconds.
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* @param delay number of milliseconds to wait
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* @param f_cpu CPU frequency in Hertz
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*
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* @def cpu_delay_us
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* @brief Delay program execution for a specified number of microseconds.
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* @param delay number of microseconds to wait
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* @param f_cpu CPU frequency in Hertz
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*
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* @def cpu_ms_2_cy
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* @brief Convert milli-seconds into CPU cycles.
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* @param ms number of milliseconds
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* @param f_cpu CPU frequency in Hertz
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* @return the converted number of CPU cycles
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*
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* @def cpu_us_2_cy
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* @brief Convert micro-seconds into CPU cycles.
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* @param ms number of microseconds
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* @param f_cpu CPU frequency in Hertz
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* @return the converted number of CPU cycles
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*
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* @{
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*/
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__always_optimize
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static inline void __portable_avr_delay_cycles(unsigned long n)
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{
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while (n) {
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barrier();
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n--;
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}
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}
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#if !defined(__DELAY_CYCLE_INTRINSICS__)
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# define delay_cycles __portable_avr_delay_cycles
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# define cpu_ms_2_cy(ms, f_cpu) (((uint64_t)(ms) * (f_cpu) / 6 + 999) / 1e3)
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# define cpu_us_2_cy(us, f_cpu) (((uint64_t)(us) * (f_cpu) / 6 + 999999ul) / 1e6)
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#else
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# if defined(__GNUC__)
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# define delay_cycles __builtin_avr_delay_cycles
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# elif defined(__ICCAVR__)
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# define delay_cycles __delay_cycles
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# endif
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# define cpu_ms_2_cy(ms, f_cpu) (((uint64_t)(ms) * (f_cpu) + 999) / 1e3)
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# define cpu_us_2_cy(us, f_cpu) (((uint64_t)(us) * (f_cpu) + 999999ul) / 1e6)
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#endif
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#define cpu_delay_ms(delay, f_cpu) delay_cycles((uint64_t)cpu_ms_2_cy(delay, f_cpu))
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#define cpu_delay_us(delay, f_cpu) delay_cycles((uint64_t)cpu_us_2_cy(delay, f_cpu))
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//! @}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CYCLE_COUNTER_H_ */
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