128 lines
4.3 KiB
C
128 lines
4.3 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 and etimer are using the sleep timer on the cc2430
|
|
*
|
|
* clock_init() has set our tick speed prescaler already, so we
|
|
* are ticking with 500 kHz freq.
|
|
*
|
|
* rtimer_clock_t is unsigned short (16bit on the cc2430)
|
|
* It thus makes sense to use the 16bit clock (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" /* Includes rtimer-arch.h for us */
|
|
#include "cc2430_sfr.h"
|
|
#include "sys/energest.h"
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rtimer_arch_init(void)
|
|
{
|
|
PRINTF("rtimer_arch_init() ");
|
|
/*
|
|
* - 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 = (T1DIV1 | T1MODE0); /* 00001001 */
|
|
PRINTF("T1CTL=0x%02x\n", T1CTL);
|
|
/* Acknowledge Timer 1 Interrupts */
|
|
IEN1_T1IE = 1;
|
|
PRINTF("IEN1_T1IE=0x%02x\n", IEN1_T1IE);
|
|
|
|
/* Timer 1, Channel 1. Compare Mode (0x04), Interrupt mask on (0x40) */
|
|
T1CCTL1 = T1MODE + T1IM;
|
|
PRINTF("T1CCTL1=0x%02x\n", T1CCTL1);
|
|
|
|
/* Interrupt Mask Flags: No interrupt on overflow */
|
|
TIMIF &= ~OVFIM;
|
|
PRINTF("TIMIF=0x%02x\n", TIMIF);
|
|
|
|
PRINTF("done\n");
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rtimer_arch_schedule(rtimer_clock_t t)
|
|
{
|
|
PRINTF("rtimer_arch_schedule(%u)\n", t);
|
|
|
|
/* set the compare mode values so we can get an interrupt after t */
|
|
T1CC1L = (unsigned char) t;
|
|
T1CC1H = (unsigned char) (t >> 8);
|
|
PRINTF("T1CC1=%u, t=%u\n", (T1CC1L + (T1CC1H << 8)), t);
|
|
|
|
/* Turn on compare mode interrupt */
|
|
PRINTF("T1CTL=0x%02x\n", T1CTL);
|
|
T1CCTL1 |= T1IM;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
#pragma save
|
|
#if CC_CONF_OPTIMIZE_STACK_SIZE
|
|
#pragma exclude bits
|
|
#endif
|
|
void
|
|
cc2430_timer_1_ISR(void) __interrupt (T1_VECTOR)
|
|
{
|
|
IEN1_T1IE = 0; /* Ignore Timer 1 Interrupts */
|
|
ENERGEST_ON(ENERGEST_TYPE_IRQ);
|
|
/* No more interrupts from Channel 1 till next rtimer_arch_schedule() call.
|
|
* Setting the mask will instantly generate an interrupt so we clear the
|
|
* flag first. */
|
|
T1CTL &= ~(CH1IF);
|
|
T1CCTL1 &= ~T1IM;
|
|
|
|
rtimer_run_next();
|
|
|
|
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
|
|
IEN1_T1IE = 1; /* Acknowledge Timer 1 Interrupts */
|
|
}
|
|
#pragma restore
|