185 lines
6.5 KiB
C
185 lines
6.5 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup cc13xx-cc26xx-rtc
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* @{
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*
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* \file
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* Implementation of the CC13xx/CC26xx AON RTC driver
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "sys/energest.h"
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#include "rtimer.h"
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#include "lpm.h"
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#include "ti-lib.h"
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#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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#define soc_rtc_isr(...) AONRTCIntHandler(__VA_ARGS__)
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/*---------------------------------------------------------------------------*/
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/* Prototype of a function in clock.c. Called every time the handler fires */
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void clock_update(void);
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static rtimer_clock_t last_isr_time;
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/*---------------------------------------------------------------------------*/
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#define COMPARE_INCREMENT (RTIMER_SECOND / CLOCK_SECOND)
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#define MULTIPLE_512_MASK 0xFFFFFE00
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/*---------------------------------------------------------------------------*/
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/*
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* Used to test timer wraparounds.
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*
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* Set to 0xFFFFFFFA to test AON RTC second counter wraparound
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* Set to 0xFFFA to test AON RTC 16.16 format wraparound
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*/
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#ifdef SOC_RTC_CONF_START_TICK_COUNT
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#define SOC_RTC_START_TICK_COUNT SOC_RTC_CONF_START_TICK_COUNT
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#else
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#define SOC_RTC_START_TICK_COUNT 0
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#endif
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/*---------------------------------------------------------------------------*/
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void
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soc_rtc_init(void)
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{
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bool interrupts_disabled;
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uint32_t next;
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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();
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ti_lib_aon_rtc_event_clear(AON_RTC_CH0);
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ti_lib_aon_rtc_event_clear(AON_RTC_CH1);
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ti_lib_aon_rtc_event_clear(AON_RTC_CH2);
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/* Setup the wakeup event */
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ti_lib_aon_event_mcu_wake_up_set(AON_EVENT_MCU_WU0, AON_EVENT_RTC_CH0);
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ti_lib_aon_event_mcu_wake_up_set(AON_EVENT_MCU_WU1, AON_EVENT_RTC_CH1);
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ti_lib_aon_event_mcu_wake_up_set(AON_EVENT_MCU_WU2, AON_EVENT_RTC_CH2);
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ti_lib_aon_rtc_combined_event_config(AON_RTC_CH0 | AON_RTC_CH1 | AON_RTC_CH2);
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HWREG(AON_RTC_BASE + AON_RTC_O_SEC) = SOC_RTC_START_TICK_COUNT;
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next = ti_lib_aon_rtc_current_compare_value_get() + COMPARE_INCREMENT;
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/* Configure channel 1 to start generating clock ticks. First tick at 512 */
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ti_lib_aon_rtc_compare_value_set(AON_RTC_CH1, next);
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/* Enable channel 1 and the RTC */
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ti_lib_aon_rtc_channel_enable(AON_RTC_CH1);
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ti_lib_aon_rtc_enable();
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ti_lib_rom_int_enable(INT_AON_RTC_COMB);
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/* Re-enable interrupts */
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if(!interrupts_disabled) {
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ti_lib_int_master_enable();
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}
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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soc_rtc_get_next_trigger()
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{
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rtimer_clock_t ch1 = ti_lib_aon_rtc_compare_value_get(AON_RTC_CH1);
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if(HWREG(AON_RTC_BASE + AON_RTC_O_CHCTL) & AON_RTC_CHCTL_CH0_EN) {
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rtimer_clock_t ch0 = ti_lib_aon_rtc_compare_value_get(AON_RTC_CH0);
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return RTIMER_CLOCK_LT(ch0, ch1) ? ch0 : ch1;
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}
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return ch1;
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}
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/*---------------------------------------------------------------------------*/
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void
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soc_rtc_schedule_one_shot(uint32_t channel, uint32_t ticks)
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{
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if((channel != AON_RTC_CH0) && (channel != AON_RTC_CH1) && (channel != AON_RTC_CH2)) {
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return;
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}
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/* Set the channel to fire a one-shot compare event at time==ticks */
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ti_lib_aon_rtc_compare_value_set(channel, ticks);
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ti_lib_aon_rtc_channel_enable(channel);
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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soc_rtc_last_isr_time(void)
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{
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return last_isr_time;
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}
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/*---------------------------------------------------------------------------*/
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/* The AON RTC interrupt handler */
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void
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soc_rtc_isr(void)
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{
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uint32_t next;
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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last_isr_time = RTIMER_NOW();
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/* Adjust the s/w tick counter irrespective of which event trigger this */
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clock_update();
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if(ti_lib_aon_rtc_event_get(AON_RTC_CH1)) {
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HWREG(AON_RTC_BASE + AON_RTC_O_EVFLAGS) = AON_RTC_EVFLAGS_CH1;
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/*
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* We need to keep ticking while we are awake, so we schedule the next
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* event on the next 512 tick boundary. If we drop to deep sleep before it
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* happens, lpm_drop() will reschedule us in the 'distant' future
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*/
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next = ((ti_lib_aon_rtc_current_compare_value_get() + 5) +
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COMPARE_INCREMENT) & MULTIPLE_512_MASK;
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ti_lib_aon_rtc_compare_value_set(AON_RTC_CH1, next);
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}
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if(ti_lib_aon_rtc_event_get(AON_RTC_CH0)) {
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ti_lib_aon_rtc_channel_disable(AON_RTC_CH0);
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HWREG(AON_RTC_BASE + AON_RTC_O_EVFLAGS) = AON_RTC_EVFLAGS_CH0;
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rtimer_run_next();
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}
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if(ti_lib_aon_rtc_event_get(AON_RTC_CH2)) {
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/* after sleep; since a rtimer is already scheduled, do nothing */
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ti_lib_aon_rtc_channel_disable(AON_RTC_CH2);
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HWREG(AON_RTC_BASE + AON_RTC_O_EVFLAGS) = AON_RTC_EVFLAGS_CH2;
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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