114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
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/**
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* \file
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*
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* \brief ARM functions for busy-wait delay loops
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*
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* Copyright (c) 2014-2015 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_INCLUDED
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#define CYCLE_COUNTER_H_INCLUDED
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#include <compiler.h>
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#include <clock.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \name Convenience functions for busy-wait delay loops
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*
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* @{
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*/
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/**
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* \brief Delay loop to delay n number of cycles
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* Delay program execution for at least the specified number of CPU cycles.
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*
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* \param n Number of cycles to delay
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*/
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static inline void delay_cycles(
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const uint32_t n)
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{
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if (n > 0) {
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SysTick->LOAD = n;
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SysTick->VAL = 0;
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while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)) {
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};
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}
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}
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void delay_cycles_us(uint32_t n);
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void delay_cycles_ms(uint32_t n);
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/**
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* \brief Delay program execution for at least the specified number of microseconds.
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*
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* \param delay number of microseconds to wait
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*/
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#define cpu_delay_us(delay) delay_cycles_us(delay)
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/**
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* \brief Delay program execution for at least the specified number of milliseconds.
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*
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* \param delay number of milliseconds to wait
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*/
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#define cpu_delay_ms(delay) delay_cycles_ms(delay)
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/**
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* \brief Delay program execution for at least the specified number of seconds.
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*
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* \param delay number of seconds to wait
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*/
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#define cpu_delay_s(delay) delay_cycles_ms(1000 * delay)
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/**
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* @}
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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_INCLUDED */
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