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