191 lines
6.6 KiB
C
191 lines
6.6 KiB
C
/*
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* Copyright (c) 2018, 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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* \addtogroup cc13xx-cc26xx-rtimer
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* @{
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*
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* \file
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* Implementation of the rtimer driver for CC13xx/CC26xx.
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* \author
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* Edvard Pettersen <e.pettersen@ti.com>
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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/*---------------------------------------------------------------------------*/
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#include <ti/devices/DeviceFamily.h>
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#include DeviceFamily_constructPath(driverlib/aon_event.h)
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#include DeviceFamily_constructPath(driverlib/aon_rtc.h)
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#include DeviceFamily_constructPath(driverlib/interrupt.h)
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#include <ti/drivers/dpl/ClockP.h>
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#include <ti/drivers/dpl/HwiP.h>
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/*---------------------------------------------------------------------------*/
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#include <stddef.h>
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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#define HWIP_RTC_CH AON_RTC_CH0
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#define RTIMER_RTC_CH AON_RTC_CH1
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/*---------------------------------------------------------------------------*/
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typedef void (*isr_fxn_t)(void);
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typedef void (*hwi_dispatch_fxn_t)(void);
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static hwi_dispatch_fxn_t hwi_dispatch_fxn;
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Stub function used when creating the dummy clock object.
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*/
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static void
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rtimer_clock_stub(uintptr_t unused)
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{
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(void)unused;
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/* do nothing */
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief The Man-in-the-Middle ISR hook for the HWI dispatch ISR. This
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* will be the ISR dispatched when INT_AON_RTC_COMB is triggered,
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* and will either dispatch the interrupt to the rtimer driver or
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* the HWI driver, depening on which event triggered the interrupt.
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*/
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static void
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rtimer_isr_hook(void)
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{
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if(AONRTCEventGet(RTIMER_RTC_CH)) {
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AONRTCEventClear(RTIMER_RTC_CH);
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AONRTCChannelDisable(RTIMER_RTC_CH);
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rtimer_run_next();
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}
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/*
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* HWI Dispatch clears the interrupt. If HWI wasn't triggered, clear
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* the interrupt manually.
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*/
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if(AONRTCEventGet(HWIP_RTC_CH)) {
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hwi_dispatch_fxn();
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} else {
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IntPendClear(INT_AON_RTC_COMB);
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief TODO
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*/
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void
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rtimer_arch_init(void)
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{
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uintptr_t key;
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ClockP_Struct clk_object;
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ClockP_Params clk_params;
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volatile isr_fxn_t *ramvec_table;
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key = HwiP_disable();
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/*
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* Create a dummy clock to guarantee the RAM vector table is initialized.
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*
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* Creating a dummy clock will trigger initialization of TimerP, which
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* subsequently initializes the driverlib/interrupt.h module. It is the
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* interrupt module that initializes the RAM vector table.
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*
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* It is safe to destruct the Clock object immediately afterwards.
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*/
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ClockP_Params_init(&clk_params);
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ClockP_construct(&clk_object, rtimer_clock_stub, 0, &clk_params);
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ClockP_destruct(&clk_object);
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/* Try to access the RAM vector table. */
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ramvec_table = (isr_fxn_t *)HWREG(NVIC_VTABLE);
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if(!ramvec_table) {
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/*
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* Unable to find the RAM vector table is a serious fault.
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* Spin-lock forever.
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*/
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for(;;) { /* hang */ }
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}
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/*
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* The HWI Dispatch ISR is located at interrupt number INT_AON_RTC_COMB
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* in the RAM vector table. Fetch and store it.
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*/
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hwi_dispatch_fxn = (hwi_dispatch_fxn_t)ramvec_table[INT_AON_RTC_COMB];
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if(!hwi_dispatch_fxn) {
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/*
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* Unable to find the HWI dispatch ISR in the RAM vector table is
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* a serious fault. Spin-lock forever.
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*/
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for(;;) { /* hang */ }
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}
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/*
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* Override the INT_AON_RTC_COMB interrupt number with our own ISR hook,
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* which will act as a man-in-the-middle ISR for the HWI dispatch.
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*/
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IntRegister(INT_AON_RTC_COMB, rtimer_isr_hook);
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AONEventMcuWakeUpSet(AON_EVENT_MCU_WU1, AON_EVENT_RTC_CH1);
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AONRTCCombinedEventConfig(HWIP_RTC_CH | RTIMER_RTC_CH);
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HwiP_restore(key);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Schedules an rtimer task to be triggered at time \p t.
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* \param t The time when the task will need executed.
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*
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* \p t is an absolute time, in other words the task will be
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* executed AT time \p t, not IN \p t rtimer ticks.
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*
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* This function schedules a one-shot event with the AON RTC.
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*
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* This functions converts \p t to a value suitable for the AON RTC.
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*/
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void
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rtimer_arch_schedule(rtimer_clock_t t)
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{
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/* Convert the rtimer tick value to a value suitable for the AON RTC */
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AONRTCCompareValueSet(RTIMER_RTC_CH, (uint32_t)t);
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AONRTCChannelEnable(RTIMER_RTC_CH);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Returns the current real-time clock time.
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* \return The current rtimer time in ticks.
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*
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* The value is read from the AON RTC counter and converted to a
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* number of rtimer ticks.
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*/
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rtimer_clock_t
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rtimer_arch_now()
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{
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return (rtimer_clock_t)AONRTCCurrentCompareValueGet();
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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