/**
 * @file
 * @brief    Asynchronous delay routines based on the SysTick Timer.
*/

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 * $Date: 2018-11-05 09:52:05 -0600 (Mon, 05 Nov 2018) $ 
 * $Revision: 38934 $
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 *************************************************************************** */

/* Define to prevent redundant inclusion */
#ifndef _DELAY_H_
#define _DELAY_H_

/**
 * @defgroup    MXC_delay Delay Utility Functions 
 * @ingroup     devicelibs 
 * @brief       Asynchronous delay routines based on the SysTick Timer
 * @{
 */ 

/***** Definitions *****/
/**
 * Macro used to specify a microsecond timing parameter in seconds.
 * \code
 * x = SEC(3) // 3 seconds -> x = 3,000,000 
 * \endcode
 */
#define MXC_DELAY_SEC(s)            (((unsigned long)s) * 1000000UL)  
/**
 * Macro used to specify a microsecond timing parameter in milliseconds.
 * \code
 * x = MSEC(3) // 3ms -> x = 3,000
 * \endcode
 */
#define MXC_DELAY_MSEC(ms)          (ms * 1000UL)
/**
 * Macro used to specify a microsecond timing parameter.
 * \code
 * x = USEC(3) // 3us -> x = 3
 * \endcode
 */
#define MXC_DELAY_USEC(us)          (us)

/***** Function Prototypes *****/

/**
 * @brief      Blocks and delays for the specified number of microseconds.
 * @details    Uses the SysTick to create the requested delay. If the SysTick is
 *             running, the current settings will be used. If the SysTick is not
 *             running, it will be started.
 * @param      us    microseconds to delay
 * @return     #E_NO_ERROR if no errors, @ref MXC_Error_Codes "error" if unsuccessful.
 */
int mxc_delay(unsigned long us);

/**
 * @brief      Starts a non-blocking delay for the specified number of
 *             microseconds.
 * @details    Uses the SysTick to time the requested delay. If the SysTick is
 *             running, the current settings will be used. If the SysTick is not
 *             running, it will be started.
 * @note       mxc_delay_handler() must be called from the SysTick interrupt service
 *             routine or at a rate greater than the SysTick overflow rate.
 * @param      us    microseconds to delay
 * @return     #E_NO_ERROR if no errors, #E_BUSY if currently servicing another
 *             delay request.
 */
int mxc_delay_start(unsigned long us);

/**
 * @brief      Returns the status of a non-blocking delay request
 * @pre        Start the asynchronous delay by calling mxc_delay_start().
 * @return     #E_BUSY until the requested delay time has expired.
 */
int mxc_delay_check(void);

/**
 * @brief      Stops an asynchronous delay previously started.
 * @pre        Start the asynchronous delay by calling mxc_delay_start().
 */
void mxc_delay_stop(void);

/**
 * @brief      Processes the delay interrupt.
 * @details    This function must be called from the SysTick IRQ or polled at a
 *             rate greater than the SysTick overflow rate.
 */
void mxc_delay_handler(void);

/**@} end of group MXC_delay */

#endif /* _DELAY_H_ */