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/**
***************************************************************************************
* File Name : lp_timer.c
* Description : Low power timer to be used within Mesh Application.
***************************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2019 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "app_common.h"
#include "lp_timer.h"
/* Exported variables --------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void LpTimerCb(void);
/* Private typedef -----------------------------------------------------------*/
typedef struct
{
uint32_t LpTimeLeftOnEntry;
uint8_t LpTimer_Id;
} LpTimerContext_t;
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static LpTimerContext_t LpTimerContext;
/* Functions Definition ------------------------------------------------------*/
/**
* @brief Initialize the low power timer
*
* @param None
* @retval None
*/
void LpTimerInit(void)
{
(void) HW_TS_Create(CFG_TIM_PROC_ID_ISR, &(LpTimerContext.LpTimer_Id), hw_ts_SingleShot, LpTimerCb);
return;
}
/**
* @brief Request to start a low power timer ( running is stop mode )
*
* @param time_to_sleep : in ms
* @retval None
*/
void LpTimerStart(uint32_t time_to_sleep)
{
/* Converts the number of ms into hw timer tick */
if(time_to_sleep > 0x400000)
{
time_to_sleep = time_to_sleep / (CFG_TS_TICK_VAL);
time_to_sleep *= 1000;
}
else
{
time_to_sleep *= 1000;
time_to_sleep = time_to_sleep / (CFG_TS_TICK_VAL);
}
HW_TS_Start(LpTimerContext.LpTimer_Id, time_to_sleep);
/**
* There might be other timers already running in the timer server that may elapse
* before this one.
* Store how long before the next event so that on wakeup, it will be possible to calculate
* how long the tick has been suppressed
*/
LpTimerContext.LpTimeLeftOnEntry = HW_TS_RTC_ReadLeftTicksToCount();
return;
}
/**
* @brief Read how long the timer has run
*
* @param None
* @retval The time elapsed in ms
*/
uint32_t LpGetElapsedTime(void)
{
uint32_t return_value;
return_value = (CFG_TS_TICK_VAL) * (uint32_t)(LpTimerContext.LpTimeLeftOnEntry - HW_TS_RTC_ReadLeftTicksToCount());
return_value = return_value / 1000;
/**
* The system may have been out from another reason than the timer
* Stop the timer after the elapsed time is calculated other wise, HW_TS_RTC_ReadLeftTicksToCount()
* may return 0xFFFF ( TIMER LIST EMPTY )
* It does not hurt stopping a timer that exists but is not running.
*/
HW_TS_Stop(LpTimerContext.LpTimer_Id);
return return_value;
}
/*************************************************************
*
* LOCAL FUNCTIONS
*
*************************************************************/
/**
* @brief Low power timer callback
*
* @param None
* @retval None
*/
static void LpTimerCb( void )
{
/**
* Nothing to be done
*/
return;
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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