mirror of https://github.com/ARMmbed/mbed-os.git
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/**
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*******************************************************************************
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* @file lpticker.c
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* @brief Implementation of a Low Power Ticker functionality based on RTC
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* @internal
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* @author ON Semiconductor
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* $Rev: $
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* $Date: $
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******************************************************************************
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* Copyright 2016 Semiconductor Components Industries LLC (d/b/a “ON Semiconductor”).
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* All rights reserved. This software and/or documentation is licensed by ON Semiconductor
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* under limited terms and conditions. The terms and conditions pertaining to the software
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* and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf
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* (“ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software”) and
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* if applicable the software license agreement. Do not use this software and/or
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* documentation unless you have carefully read and you agree to the limited terms and
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* conditions. By using this software and/or documentation, you agree to the limited
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* terms and conditions.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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* ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
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* INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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* @endinternal
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*
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* @ingroup lpticker
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*
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* @details
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* This is Low Power ticker derived from RTC
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*
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*/
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#include "device.h"
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#if DEVICE_LOWPOWERTIMER
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#include "cmsis_nvic.h"
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#include "lp_ticker_api.h"
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#include "rtc.h"
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#include "rtc_map.h"
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/* Initialize the RTC for low power ticker */
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void lp_ticker_init()
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{
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fRtcInit();
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}
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/* Return the current RTC counter value in us */
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uint32_t lp_ticker_read()
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{
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return (uint32_t)(fRtcRead() & 0xFFFFFFFF); /* TODO Truncating 64 bit value to 32 bit */
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}
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/* Set interrupt for specified time */
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void lp_ticker_set_interrupt(timestamp_t timestamp)
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{
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/* The RTC Match register needs to be Set to the RTC alarm value */
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fRtcSetInterrupt(timestamp);
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}
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void lp_ticker_fire_interrupt(void)
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{
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NVIC_SetPendingIRQ(Rtc_IRQn);
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}
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/** Disable low power ticker interrupt
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*
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*/
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void lp_ticker_disable_interrupt(void)
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{
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fRtcDisableInterrupt();
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}
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/** Clear the low power ticker interrupt
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*
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*/
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void lp_ticker_clear_interrupt(void)
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{
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fRtcClearInterrupt();
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}
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#endif /* DEVICE_LOWPOWERTIMER */
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