140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/**
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* \file
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*
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* \brief Common Delay Service
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*
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* Copyright (c) 2014-2016 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 _DELAY_H_
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#define _DELAY_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sysclk.h>
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#if UC3
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# include <cycle_counter.h>
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#elif XMEGA
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# include "xmega/cycle_counter.h"
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#elif MEGA
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# include "mega/cycle_counter.h"
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#elif SAM
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# include "sam/cycle_counter.h"
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#endif
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/**
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* @defgroup group_common_services_delay Busy-Wait Delay Routines
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*
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* This module provides simple loop-based delay routines for those
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* applications requiring a brief wait during execution. Common API
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* for UC3, XMEGA, and AVR MEGA.
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*
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* @{
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*/
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/**
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* @def F_CPU
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* @brief MCU Clock Frequency (Hertz)
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*
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* @deprecated
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* The \ref F_CPU configuration constant is used for compatibility with the
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* \ref group_common_services_delay routines. The common loop-based delay
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* routines are designed to use the \ref clk_group modules while anticipating
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* support for legacy applications assuming a statically defined clock
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* frequency. Applications using a statically configured MCU clock frequency
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* can define \ref F_CPU (Hertz), in which case the common delay routines will
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* use this value rather than calling sysclk_get_cpu_hz() to get the current
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* MCU clock frequency.
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*/
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#ifndef F_CPU
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# define F_CPU sysclk_get_cpu_hz()
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#endif
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/**
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* @def delay_init
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*
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* @brief Initialize the delay driver.
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* @param fcpu_hz CPU frequency in Hz
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*
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* @deprecated
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* This function is provided for compatibility with ASF applications that
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* may not have been updated to configure the system clock via the common
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* clock service; e.g. sysclk_init() and a configuration header file are
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* used to configure clocks.
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*
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* The functions in this module call \ref sysclk_get_cpu_hz() function to
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* obtain the system clock frequency.
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*/
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#define delay_init(fcpu_hz)
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/**
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* @def delay_s
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* @brief Delay in seconds.
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* @param delay Delay in seconds
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*/
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#define delay_s(delay) ((delay) ? cpu_delay_ms(1000 * delay, F_CPU) : cpu_delay_us(1, F_CPU))
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/**
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* @def delay_ms
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* @brief Delay in milliseconds.
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* @param delay Delay in milliseconds
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*/
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#define delay_ms(delay) ((delay) ? cpu_delay_ms(delay, F_CPU) : cpu_delay_us(1, F_CPU))
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/**
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* @def delay_us
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* @brief Delay in microseconds.
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* @param delay Delay in microseconds
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*/
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#define delay_us(delay) ((delay) ? cpu_delay_us(delay, F_CPU) : cpu_delay_us(1, F_CPU))
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#ifdef __cplusplus
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}
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#endif
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/**
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* @}
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*/
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#endif /* _DELAY_H_ */
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