120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/*
|
|
* Copyright (c) 2010, Loughborough University - Computer Science
|
|
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Hardware-dependent functions used to support the
|
|
* contiki rtimer module.
|
|
*
|
|
* clock_init() has set our tick speed prescaler already, so we
|
|
* are ticking with 500 kHz freq.
|
|
*
|
|
* Contiki typedefs rtimer_clock_t as unsigned short (16bit)
|
|
* It thus makes sense to use the 16bit timer (Timer 1)
|
|
*
|
|
* This file contains an ISR and must reside in the HOME bank
|
|
*
|
|
* \author
|
|
* George Oikonomou - <oikonomou@users.sourceforge.net>
|
|
*/
|
|
|
|
#include "sys/rtimer.h"
|
|
#include "sfr-bits.h"
|
|
#include "cc253x.h"
|
|
#include "sys/energest.h"
|
|
|
|
#include "debug.h"
|
|
#include <stdio.h>
|
|
|
|
#define RT_MODE_COMPARE() do { T1CCTL1 |= T1CCTL_MODE; } while(0)
|
|
#define RT_MODE_CAPTURE() do { T1CCTL1 &= ~T1CCTL_MODE; } while(0)
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rtimer_arch_init(void)
|
|
{
|
|
/*
|
|
* - Free running mode
|
|
* - Prescale by 32:
|
|
* Tick Speed has been prescaled to 500 kHz already in clock_init()
|
|
* We further prescale by 32 resulting in 15625 Hz for this timer.
|
|
*/
|
|
T1CTL = (T1CTL_DIV1 | T1CTL_MODE0);
|
|
|
|
T1STAT = 0;
|
|
|
|
/* Timer 1, Channel 1. Compare Mode (0x04), Interrupt mask on (0x40) */
|
|
T1CCTL1 = T1CCTL_MODE | T1CCTL_IM;
|
|
|
|
/* Interrupt Mask Flags: No interrupt on overflow */
|
|
OVFIM = 0;
|
|
|
|
/* Acknowledge Timer 1 Interrupts */
|
|
T1IE = 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rtimer_arch_schedule(rtimer_clock_t t)
|
|
{
|
|
/* Switch to capture mode before writing T1CC1x and
|
|
* set the compare mode values so we can get an interrupt after t */
|
|
RT_MODE_CAPTURE();
|
|
T1CC1L = (unsigned char)t;
|
|
T1CC1H = (unsigned char)(t >> 8);
|
|
RT_MODE_COMPARE();
|
|
|
|
/* Turn on compare mode interrupt */
|
|
T1STAT = 0;
|
|
T1CCTL1 |= T1CCTL_IM;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* avoid referencing bits, we don't call code which use them */
|
|
#pragma save
|
|
#if CC_CONF_OPTIMIZE_STACK_SIZE
|
|
#pragma exclude bits
|
|
#endif
|
|
void
|
|
rtimer_isr(void) __interrupt(T1_VECTOR)
|
|
{
|
|
T1IE = 0; /* Ignore Timer 1 Interrupts */
|
|
ENERGEST_ON(ENERGEST_TYPE_IRQ);
|
|
|
|
/* No more interrupts from Channel 1 till next rtimer_arch_schedule() call */
|
|
T1STAT &= ~T1STAT_CH1IF;
|
|
T1CCTL1 &= ~T1CCTL_IM;
|
|
|
|
rtimer_run_next();
|
|
|
|
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
|
|
T1IE = 1; /* Acknowledge Timer 1 Interrupts */
|
|
}
|
|
#pragma restore
|