125 lines
4.5 KiB
C
125 lines
4.5 KiB
C
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/**
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* @file
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* @brief Asynchronous delay routines based on the SysTick Timer.
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*/
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/* ****************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2018-11-05 09:52:05 -0600 (Mon, 05 Nov 2018) $
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* $Revision: 38934 $
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*
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*************************************************************************** */
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/* Define to prevent redundant inclusion */
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#ifndef _DELAY_H_
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#define _DELAY_H_
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/**
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* @defgroup MXC_delay Delay Utility Functions
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* @ingroup devicelibs
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* @brief Asynchronous delay routines based on the SysTick Timer
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* @{
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*/
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/***** Definitions *****/
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/**
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* Macro used to specify a microsecond timing parameter in seconds.
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* \code
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* x = SEC(3) // 3 seconds -> x = 3,000,000
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* \endcode
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*/
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#define MXC_DELAY_SEC(s) (((unsigned long)s) * 1000000UL)
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/**
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* Macro used to specify a microsecond timing parameter in milliseconds.
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* \code
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* x = MSEC(3) // 3ms -> x = 3,000
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* \endcode
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*/
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#define MXC_DELAY_MSEC(ms) (ms * 1000UL)
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/**
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* Macro used to specify a microsecond timing parameter.
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* \code
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* x = USEC(3) // 3us -> x = 3
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* \endcode
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*/
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#define MXC_DELAY_USEC(us) (us)
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/***** Function Prototypes *****/
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/**
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* @brief Blocks and delays for the specified number of microseconds.
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* @details Uses the SysTick to create the requested delay. If the SysTick is
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* running, the current settings will be used. If the SysTick is not
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* running, it will be started.
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* @param us microseconds to delay
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* @return #E_NO_ERROR if no errors, @ref MXC_Error_Codes "error" if unsuccessful.
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*/
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int mxc_delay(unsigned long us);
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/**
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* @brief Starts a non-blocking delay for the specified number of
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* microseconds.
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* @details Uses the SysTick to time the requested delay. If the SysTick is
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* running, the current settings will be used. If the SysTick is not
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* running, it will be started.
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* @note mxc_delay_handler() must be called from the SysTick interrupt service
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* routine or at a rate greater than the SysTick overflow rate.
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* @param us microseconds to delay
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* @return #E_NO_ERROR if no errors, #E_BUSY if currently servicing another
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* delay request.
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*/
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int mxc_delay_start(unsigned long us);
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/**
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* @brief Returns the status of a non-blocking delay request
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* @pre Start the asynchronous delay by calling mxc_delay_start().
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* @return #E_BUSY until the requested delay time has expired.
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*/
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int mxc_delay_check(void);
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/**
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* @brief Stops an asynchronous delay previously started.
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* @pre Start the asynchronous delay by calling mxc_delay_start().
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*/
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void mxc_delay_stop(void);
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/**
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* @brief Processes the delay interrupt.
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* @details This function must be called from the SysTick IRQ or polled at a
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* rate greater than the SysTick overflow rate.
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*/
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void mxc_delay_handler(void);
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/**@} end of group MXC_delay */
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#endif /* _DELAY_H_ */
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