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untested protothread timer stuff

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master
neingeist 15 years ago
parent 427eb62ac4
commit 0de9d4db1e
7 changed files with 376 additions and 7 deletions
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2
projekte/protothreads/Makefile
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@ -9,7 +9,7 @@ MCU = atmega168
F_CPU = 16000000
FORMAT = ihex
TARGET = example
SRC = example.c
SRC = example.c timer/clock-arch.c timer/timer.c
ASRC =
OPT = s

21
projekte/protothreads/example.c
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@ -2,10 +2,15 @@
#include "util/delay.h"
#include "pt.h"
#include "timer/clock.h"
#include "timer/timer.h"
/* Two flags that the two protothread functions use. */
static int protothread1_flag, protothread2_flag;
/* Two timers for the two protothreads. */
static struct timer timer1, timer2;
static int
protothread1(struct pt *pt)
{
@ -19,10 +24,11 @@ protothread1(struct pt *pt)
PT_WAIT_UNTIL(pt, protothread2_flag != 0);
PORTB |= _BV(PB3);
_delay_ms(200);
timer_set(&timer1, CLOCK_SECOND/2);
PT_WAIT_UNTIL(pt, timer_expired(&timer1));
PORTB &= ~_BV(PB3);
_delay_ms(200);
timer_set(&timer1, CLOCK_SECOND/2);
PT_WAIT_UNTIL(pt, timer_expired(&timer1));
/* We then reset the other protothread's flag, and set our own
flag so that the other protothread can run. */
@ -53,9 +59,11 @@ protothread2(struct pt *pt)
PT_WAIT_UNTIL(pt, protothread1_flag != 0);
PORTB |= _BV(PB2);
_delay_ms(100);
timer_set(&timer2, CLOCK_SECOND/2);
PT_WAIT_UNTIL(pt, timer_expired(&timer2));
PORTB &= ~_BV(PB2);
_delay_ms(100);
timer_set(&timer2, CLOCK_SECOND/2);
PT_WAIT_UNTIL(pt, timer_expired(&timer2));
/* We then reset the other protothread's flag, and set our own
@ -79,6 +87,9 @@ int main(void) {
// pin 10 = PB2
DDRB |= _BV(PB2);
/* Initialize clock */
clock_init();
/* Initialize the protothread state variables with PT_INIT(). */
PT_INIT(&pt1);
PT_INIT(&pt2);

43
projekte/protothreads/timer/clock-arch.c
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@ -0,0 +1,43 @@
// from avr-uip
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/sfr_defs.h>
#include "clock-arch.h"
//Counted time
clock_time_t clock_datetime = 0;
//Overflow itnerrupt
ISR(TIMER0_OVF_vect)
{
clock_datetime += 1;
TIFR0 |= (1<<TOV0);
}
//Initialise the clock
void clock_init(){
//Activate overflow interrupt for timer0
TIMSK0 |= (1<<TOIE0);
//Use prescaler 1024
TCCR0B |= ((1<<CS12)|(1<<CS10));
//Activate interrupts
sei();
}
//Return time
clock_time_t clock_time(){
clock_time_t time;
cli();
time = clock_datetime;
sei();
return time;
}

14
projekte/protothreads/timer/clock-arch.h
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@ -0,0 +1,14 @@
// from avr-uip
#ifndef __CLOCK_ARCH_H__
#define __CLOCK_ARCH_H__
#include <stdint.h>
typedef uint16_t clock_time_t;
#define CLOCK_CONF_SECOND (F_CPU / (1024*255))
//Freqency divided prescaler and counter register size
void clock_init(void);
clock_time_t clock_time(void);
#endif /* __CLOCK_ARCH_H__ */

88
projekte/protothreads/timer/clock.h
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@ -0,0 +1,88 @@
/**
* \defgroup clock Clock interface
*
* The clock interface is the interface between the \ref timer "timer library"
* and the platform specific clock functionality. The clock
* interface must be implemented for each platform that uses the \ref
* timer "timer library".
*
* The clock interface does only one this: it measures time. The clock
* interface provides a macro, CLOCK_SECOND, which corresponds to one
* second of system time.
*
* \sa \ref timer "Timer library"
*
* @{
*/
/*
* Copyright (c) 2004, Swedish Institute of 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 uIP TCP/IP stack
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: clock.h,v 1.3 2006/06/11 21:46:39 adam Exp $
*/
#ifndef __CLOCK_H__
#define __CLOCK_H__
#include "clock-arch.h"
/**
* Initialize the clock library.
*
* This function initializes the clock library and should be called
* from the main() function of the system.
*
*/
void clock_init(void);
/**
* Get the current clock time.
*
* This function returns the current system clock time.
*
* \return The current clock time, measured in system ticks.
*/
clock_time_t clock_time(void);
/**
* A second, measured in system clock time.
*
* \hideinitializer
*/
#ifdef CLOCK_CONF_SECOND
#define CLOCK_SECOND CLOCK_CONF_SECOND
#else
#define CLOCK_SECOND (clock_time_t)32
#endif
#endif /* __CLOCK_H__ */
/** @} */

127
projekte/protothreads/timer/timer.c
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@ -0,0 +1,127 @@
/**
* \addtogroup timer
* @{
*/
/**
* \file
* Timer library implementation.
* \author
* Adam Dunkels <adam@sics.se>
*/
/*
* Copyright (c) 2004, Swedish Institute of 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 uIP TCP/IP stack
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: timer.c,v 1.2 2006/06/12 08:00:30 adam Exp $
*/
#include "timer/clock.h"
#include "timer/timer.h"
/*---------------------------------------------------------------------------*/
/**
* Set a timer.
*
* This function is used to set a timer for a time sometime in the
* future. The function timer_expired() will evaluate to true after
* the timer has expired.
*
* \param t A pointer to the timer
* \param interval The interval before the timer expires.
*
*/
void
timer_set(struct timer *t, clock_time_t interval)
{
t->interval = interval;
t->start = clock_time();
}
/*---------------------------------------------------------------------------*/
/**
* Reset the timer with the same interval.
*
* This function resets the timer with the same interval that was
* given to the timer_set() function. The start point of the interval
* is the exact time that the timer last expired. Therefore, this
* function will cause the timer to be stable over time, unlike the
* timer_rester() function.
*
* \param t A pointer to the timer.
*
* \sa timer_restart()
*/
void
timer_reset(struct timer *t)
{
t->start += t->interval;
}
/*---------------------------------------------------------------------------*/
/**
* Restart the timer from the current point in time
*
* This function restarts a timer with the same interval that was
* given to the timer_set() function. The timer will start at the
* current time.
*
* \note A periodic timer will drift if this function is used to reset
* it. For preioric timers, use the timer_reset() function instead.
*
* \param t A pointer to the timer.
*
* \sa timer_reset()
*/
void
timer_restart(struct timer *t)
{
t->start = clock_time();
}
/*---------------------------------------------------------------------------*/
/**
* Check if a timer has expired.
*
* This function tests if a timer has expired and returns true or
* false depending on its status.
*
* \param t A pointer to the timer
*
* \return Non-zero if the timer has expired, zero otherwise.
*
*/
int
timer_expired(struct timer *t)
{
return (clock_time_t)(clock_time() - t->start) >= (clock_time_t)t->interval;
}
/*---------------------------------------------------------------------------*/
/** @} */

86
projekte/protothreads/timer/timer.h
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@ -0,0 +1,86 @@
/**
* \defgroup timer Timer library
*
* The timer library provides functions for setting, resetting and
* restarting timers, and for checking if a timer has expired. An
* application must "manually" check if its timers have expired; this
* is not done automatically.
*
* A timer is declared as a \c struct \c timer and all access to the
* timer is made by a pointer to the declared timer.
*
* \note The timer library uses the \ref clock "Clock library" to
* measure time. Intervals should be specified in the format used by
* the clock library.
*
* @{
*/
/**
* \file
* Timer library header file.
* \author
* Adam Dunkels <adam@sics.se>
*/
/*
* Copyright (c) 2004, Swedish Institute of 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 uIP TCP/IP stack
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: timer.h,v 1.3 2006/06/11 21:46:39 adam Exp $
*/
#ifndef __TIMER_H__
#define __TIMER_H__
#include "timer.h"
/**
* A timer.
*
* This structure is used for declaring a timer. The timer must be set
* with timer_set() before it can be used.
*
* \hideinitializer
*/
struct timer {
clock_time_t start;
clock_time_t interval;
};
void timer_set(struct timer *t, clock_time_t interval);
void timer_reset(struct timer *t);
void timer_restart(struct timer *t);
int timer_expired(struct timer *t);
#endif /* __TIMER_H__ */
/** @} */