nes-proj/cpu/cc26xx/dev/cc26xx-rtc.c

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/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc26xx-rtc
* @{
*
*/
/**
* \file
* Implementation of the CC26xx AON RTC driver
*/
#include "contiki.h"
#include "sys/energest.h"
#include "rtimer.h"
#include "lpm.h"
#include "ti-lib.h"
#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
#define cc26xx_rtc_isr(...) AONRTCIntHandler(__VA_ARGS__)
/*---------------------------------------------------------------------------*/
/* Prototype of a function in clock.c. Called every time the handler fires */
void clock_update(void);
/*---------------------------------------------------------------------------*/
void
cc26xx_rtc_init(void)
{
uint32_t compare_value;
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bool interrupts_disabled;
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/* Disable and clear interrupts */
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interrupts_disabled = ti_lib_int_master_disable();
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ti_lib_aon_rtc_disable();
ti_lib_aon_rtc_event_clear(AON_RTC_CH0);
ti_lib_aon_rtc_event_clear(AON_RTC_CH2);
/* Setup the wakeup event */
ti_lib_aon_event_mcu_wake_up_set(AON_EVENT_MCU_WU0, AON_EVENT_RTC0);
ti_lib_aon_event_mcu_wake_up_set(AON_EVENT_MCU_WU1, AON_EVENT_RTC2);
/* Configure channel 2 in continuous compare, 128 ticks / sec */
compare_value = (RTIMER_SECOND / CLOCK_SECOND) +
ti_lib_aon_rtc_current_compare_value_get();
ti_lib_aon_rtc_compare_value_set(AON_RTC_CH2, compare_value);
ti_lib_aon_rtc_inc_value_ch2_set(RTIMER_SECOND / CLOCK_SECOND);
ti_lib_aon_rtc_mode_ch2_set(AON_RTC_MODE_CH2_CONTINUOUS);
/* Enable event generation for channels 0 and 2 and enable the RTC */
ti_lib_aon_rtc_combined_event_config(AON_RTC_CH0 | AON_RTC_CH2);
ti_lib_aon_rtc_channel_enable(AON_RTC_CH2);
ti_lib_aon_rtc_enable();
ti_lib_int_enable(INT_AON_RTC);
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/* Re-enable interrupts */
if(!interrupts_disabled) {
ti_lib_int_master_enable();
}
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}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
cc26xx_rtc_get_next_trigger()
{
rtimer_clock_t ch2 = ti_lib_aon_rtc_compare_value_get(AON_RTC_CH2);
if(HWREG(AON_RTC_BASE + AON_RTC_O_CHCTL) & AON_RTC_CHCTL_CH0_EN) {
rtimer_clock_t ch0 = ti_lib_aon_rtc_compare_value_get(AON_RTC_CH2);
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return RTIMER_CLOCK_LT(ch0, ch2) ? ch0 : ch2;
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}
return ch2;
}
/*---------------------------------------------------------------------------*/
void
cc26xx_rtc_schedule_one_shot(uint32_t ticks)
{
/* Set the channel to fire a one-shot compare event at time==ticks */
ti_lib_aon_rtc_compare_value_set(AON_RTC_CH0, ticks);
ti_lib_aon_rtc_channel_enable(AON_RTC_CH0);
}
/*---------------------------------------------------------------------------*/
/* The AON RTC interrupt handler */
void
cc26xx_rtc_isr(void)
{
ENERGEST_ON(ENERGEST_TYPE_IRQ);
if(ti_lib_aon_rtc_event_get(AON_RTC_CH0)) {
ti_lib_aon_rtc_event_clear(AON_RTC_CH0);
rtimer_run_next();
}
if(ti_lib_aon_rtc_event_get(AON_RTC_CH2)) {
ti_lib_aon_rtc_event_clear(AON_RTC_CH2);
clock_update();
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
/** @} */