251 lines
6.8 KiB
C
251 lines
6.8 KiB
C
/*
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* Copyright (c) 2014, SICS Swedish ICT.
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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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Clock implementation for NXP jn516x.
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* \author
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* Beshr Al Nahas <beshr@sics.se>
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*
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*/
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#include <AppHardwareApi.h>
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#include <PeripheralRegs.h>
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#include "contiki.h"
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#include "sys/energest.h"
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#include "sys/clock.h"
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#include "sys/etimer.h"
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#include "rtimer-arch.h"
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#include "dev/watchdog.h"
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/**
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* TickTimer will be used for RTIMER
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* E_AHI_TIMER_1 will be used for ticking
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**/
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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static volatile unsigned long seconds = 0;
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static volatile uint8_t ticking = 0;
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static volatile clock_time_t clock_ticks = 0;
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/* last_tar is used for calculating clock_fine */
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#define CLOCK_TIMER E_AHI_TIMER_1
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#define CLOCK_TIMER_ISR_DEV E_AHI_DEVICE_TIMER1
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/* 16Mhz / 2^7 = 125Khz */
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#define CLOCK_PRESCALE 7
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/* 10ms tick --> overflow after ~981/2 days */
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#define CLOCK_INTERVAL (125 * 10)
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#define MAX_TICKS (CLOCK_INTERVAL)
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/*---------------------------------------------------------------------------*/
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void
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clockTimerISR(uint32 u32Device, uint32 u32ItemBitmap)
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{
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if(u32Device != CLOCK_TIMER_ISR_DEV) {
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return;
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}
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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watchdog_start();
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clock_ticks++;
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if(clock_ticks % CLOCK_CONF_SECOND == 0) {
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++seconds;
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energest_flush();
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}
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if(etimer_pending() && (etimer_next_expiration_time() - clock_ticks - 1) > MAX_TICKS) {
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etimer_request_poll();
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/* TODO exit low-power mode */
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}
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if(process_nevents() >= 0) {
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/* TODO exit low-power mode */
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}
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watchdog_stop();
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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static void
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clock_timer_init(void)
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{
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vAHI_TimerEnable(CLOCK_TIMER, CLOCK_PRESCALE, 0, 1, 0);
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vAHI_TimerClockSelect(CLOCK_TIMER, 0, 0);
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vAHI_TimerConfigureOutputs(CLOCK_TIMER, 0, 1);
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vAHI_TimerDIOControl(CLOCK_TIMER, 0);
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#if (CLOCK_TIMER == E_AHI_TIMER_0)
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vAHI_Timer0RegisterCallback(clockTimerISR);
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#elif (CLOCK_TIMER == E_AHI_TIMER_1)
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vAHI_Timer1RegisterCallback(clockTimerISR);
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#endif
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clock_ticks = 0;
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vAHI_TimerStartRepeat(CLOCK_TIMER, 0, CLOCK_INTERVAL);
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ticking = 1;
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_init(void)
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{
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/* gMAC_u8MaxBuffers = 2; */
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#ifdef JENNIC_CHIP_FAMILY_JN516x
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/* Turn off debugger */
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*(volatile uint32 *)0x020000a0 = 0;
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#endif
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/* system controller interrupts callback is disabled
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* -- Only wake Interrupts --
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*/
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vAHI_SysCtrlRegisterCallback(0);
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/* schedule clock tick interrupt */
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clock_timer_init();
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rtimer_init();
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(void)u32AHI_Init();
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bAHI_SetClockRate(E_AHI_XTAL_32MHZ);
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/* Wait for oscillator to stabilise */
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while(bAHI_GetClkSource() == 1) ;
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while(bAHI_Clock32MHzStable() == 0) ;
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vAHI_OptimiseWaitStates();
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/* Turn on SPI master */
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vREG_SysWrite(REG_SYS_PWR_CTRL, u32REG_SysRead(REG_SYS_PWR_CTRL)
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| REG_SYSCTRL_PWRCTRL_SPIMEN_MASK);
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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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clock_time_t t1, t2;
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do {
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t1 = clock_ticks;
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t2 = clock_ticks;
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} while(t1 != t2);
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return t1;
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_set(clock_time_t clock, clock_time_t fclock)
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{
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clock_ticks = clock;
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}
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/*---------------------------------------------------------------------------*/
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int
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clock_fine_max(void)
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{
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return CLOCK_INTERVAL;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Delay the CPU for a multiple of 0.0625 us.
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*/
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void
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clock_delay_usec(uint16_t dt)
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{
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volatile uint32_t t = u32AHI_TickTimerRead();
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#define RTIMER_MAX_TICKS 0xffffffff
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/* beware of wrapping */
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if(RTIMER_MAX_TICKS - t < dt) {
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while(u32AHI_TickTimerRead() < RTIMER_MAX_TICKS && u32AHI_TickTimerRead() != 0) ;
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dt -= RTIMER_MAX_TICKS - t;
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t = 0;
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}
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while(u32AHI_TickTimerRead() - t < dt) {
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watchdog_periodic();
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Delay the CPU for a multiple of 8 us.
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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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volatile uint32_t t = u16AHI_TimerReadCount(CLOCK_TIMER);
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/* beware of wrapping */
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if(MAX_TICKS - t < i) {
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while(u16AHI_TimerReadCount(CLOCK_TIMER) < MAX_TICKS && u16AHI_TimerReadCount(CLOCK_TIMER) != 0) ;
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i -= MAX_TICKS - t;
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t = 0;
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}
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while(u16AHI_TimerReadCount(CLOCK_TIMER) - t < i) {
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watchdog_periodic();
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Wait for a multiple of 10 ms.
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*
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*/
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void
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clock_wait(clock_time_t t)
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{
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clock_time_t start;
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start = clock_time();
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while(clock_time() - start < (clock_time_t)t) {
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watchdog_periodic();
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_set_seconds(unsigned long sec)
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{
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seconds = sec;
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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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unsigned long t1, t2;
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do {
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t1 = seconds;
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t2 = seconds;
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} while(t1 != t2);
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return t1;
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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clock_counter(void)
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{
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return rtimer_arch_now();
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}
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