149 lines
4.9 KiB
C
149 lines
4.9 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 cc26xx-clocks
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* @{
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*
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* \defgroup cc26xx-software-clock Software Clock
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*
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* Implementation of the clock module for the CC26xx and CC13xx.
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*
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* The software clock uses the facilities provided by the AON RTC driver
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* @{
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*
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* \file
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* Software clock implementation for the TI CC13xx/CC26xx
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*/
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/*---------------------------------------------------------------------------*/
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#include <ti/devices/DeviceFamily.h>
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#include DeviceFamily_constructPath(driverlib/aon_rtc.h)
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#include DeviceFamily_constructPath(driverlib/cpu.h)
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#include DeviceFamily_constructPath(driverlib/interrupt.h)
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#include DeviceFamily_constructPath(driverlib/prcm.h)
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#include DeviceFamily_constructPath(driverlib/timer.h)
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#include <ti/drivers/dpl/ClockP.h>
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#include <ti/drivers/power/PowerCC26XX.h>
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#include "contiki.h"
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#define DPL_CLOCK_TICK_PERIOD_US ClockP_getSystemTickPeriod()
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#define CLOCK_TICKS_SECOND ((uint32_t)1000000 / (CLOCK_SECOND) / (DPL_CLOCK_TICK_PERIOD_US))
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/*---------------------------------------------------------------------------*/
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static volatile uint64_t count;
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static ClockP_Struct etimerClock;
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static void clock_update(void);
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/*---------------------------------------------------------------------------*/
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void
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clock_init(void)
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{
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count = 0;
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ClockP_Params params;
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ClockP_Params_init(¶ms);
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params.period = CLOCK_TICKS_SECOND;
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params.startFlag = true;
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ClockP_construct(&etimerClock, (ClockP_Fxn)&clock_update, CLOCK_TICKS_SECOND, ¶ms);
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}
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/*---------------------------------------------------------------------------*/
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clock_time_t
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clock_time(void)
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{
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uint64_t count_read;
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{
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const uintptr_t key = HwiP_disable();
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count_read = count;
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HwiP_restore(key);
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}
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return (clock_time_t)(count_read & 0xFFFFFFFF);
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}
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/*---------------------------------------------------------------------------*/
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static void
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clock_update(void)
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{
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{
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const uintptr_t key = HwiP_disable();
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count += 1;
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HwiP_restore(key);
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}
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if (etimer_pending()) {
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etimer_request_poll();
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}
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}
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/*---------------------------------------------------------------------------*/
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unsigned long
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clock_seconds(void)
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{
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uint64_t count_read;
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{
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const uintptr_t key = HwiP_disable();
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count_read = count;
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HwiP_restore(key);
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}
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return (unsigned long)count_read / CLOCK_SECOND;
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_wait(clock_time_t i)
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{
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const clock_time_t start = clock_time();
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while(clock_time() - start < (clock_time_t)i);
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_delay_usec(uint16_t len)
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{
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// See driverlib/cpu.h
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const uint32_t cpu_clock_mhz = 48;
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// Code in flash, cache disabled: 7 cycles per loop
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const uint32_t cycles_per_loop = 7;
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// ui32Count = [delay in us] * [CPU clock in MHz] / [cycles per loop]
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const uint32_t count = (uint32_t)len * cpu_clock_mhz / cycles_per_loop;
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CPUdelay(count);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Obsolete delay function but we implement it here since some code
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* still uses it
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*/
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void
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clock_delay(unsigned int i)
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{
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clock_delay_usec(i);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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