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SimpleTimer.cpp
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SimpleTimer.cpp
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/*
* SimpleTimer.cpp
*
* SimpleTimer - A timer library for Arduino.
* Author: [email protected]
* Copyright (c) 2010 OTTOTECNICA Italy
*
* This library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser
* General Public License as published by the Free Software
* Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser
* General Public License along with this library; if not,
* write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "SimpleTimer.h"
// Select time function:
//static inline unsigned long elapsed() { return micros(); }
static inline unsigned long elapsed() { return millis(); }
SimpleTimer::SimpleTimer() {
unsigned long current_millis = elapsed();
for (int i = 0; i < MAX_TIMERS; i++) {
enabled[i] = false;
callbacks[i] = 0; // if the callback pointer is zero, the slot is free, i.e. doesn't "contain" any timer
prev_millis[i] = current_millis;
numRuns[i] = 0;
}
numTimers = 0;
}
void SimpleTimer::run() {
int i;
unsigned long current_millis;
// get current time
current_millis = elapsed();
for (i = 0; i < MAX_TIMERS; i++) {
toBeCalled[i] = DEFCALL_DONTRUN;
// no callback == no timer, i.e. jump over empty slots
if (callbacks[i]) {
// is it time to process this timer ?
// see http://arduino.cc/forum/index.php/topic,124048.msg932592.html#msg932592
if (current_millis - prev_millis[i] >= delays[i]) {
// update time
//prev_millis[i] = current_millis;
prev_millis[i] += delays[i];
// check if the timer callback has to be executed
if (enabled[i]) {
// "run forever" timers must always be executed
if (maxNumRuns[i] == RUN_FOREVER) {
toBeCalled[i] = DEFCALL_RUNONLY;
}
// other timers get executed the specified number of times
else if (numRuns[i] < maxNumRuns[i]) {
toBeCalled[i] = DEFCALL_RUNONLY;
numRuns[i]++;
// after the last run, delete the timer
if (numRuns[i] >= maxNumRuns[i]) {
toBeCalled[i] = DEFCALL_RUNANDDEL;
}
}
}
}
}
}
for (i = 0; i < MAX_TIMERS; i++) {
switch(toBeCalled[i]) {
case DEFCALL_DONTRUN:
break;
case DEFCALL_RUNONLY:
(*callbacks[i])();
break;
case DEFCALL_RUNANDDEL:
(*callbacks[i])();
deleteTimer(i);
break;
}
}
}
// find the first available slot
// return -1 if none found
int SimpleTimer::findFirstFreeSlot() {
int i;
// all slots are used
if (numTimers >= MAX_TIMERS) {
return -1;
}
// return the first slot with no callback (i.e. free)
for (i = 0; i < MAX_TIMERS; i++) {
if (callbacks[i] == 0) {
return i;
}
}
// no free slots found
return -1;
}
int SimpleTimer::setTimer(long d, timer_callback f, int n) {
int freeTimer;
freeTimer = findFirstFreeSlot();
if (freeTimer < 0) {
return -1;
}
if (f == NULL) {
return -1;
}
delays[freeTimer] = d;
callbacks[freeTimer] = f;
maxNumRuns[freeTimer] = n;
enabled[freeTimer] = true;
prev_millis[freeTimer] = elapsed();
numTimers++;
return freeTimer;
}
int SimpleTimer::setInterval(long d, timer_callback f) {
return setTimer(d, f, RUN_FOREVER);
}
int SimpleTimer::setTimeout(long d, timer_callback f) {
return setTimer(d, f, RUN_ONCE);
}
void SimpleTimer::deleteTimer(int timerId) {
if (timerId >= MAX_TIMERS) {
return;
}
// nothing to delete if no timers are in use
if (numTimers == 0) {
return;
}
// don't decrease the number of timers if the
// specified slot is already empty
if (callbacks[timerId] != NULL) {
callbacks[timerId] = 0;
enabled[timerId] = false;
toBeCalled[timerId] = DEFCALL_DONTRUN;
delays[timerId] = 0;
numRuns[timerId] = 0;
// update number of timers
numTimers--;
}
}
// function contributed by [email protected]
void SimpleTimer::restartTimer(int numTimer) {
if (numTimer >= MAX_TIMERS) {
return;
}
prev_millis[numTimer] = elapsed();
}
boolean SimpleTimer::isEnabled(int numTimer) {
if (numTimer >= MAX_TIMERS) {
return false;
}
return enabled[numTimer];
}
void SimpleTimer::enable(int numTimer) {
if (numTimer >= MAX_TIMERS) {
return;
}
enabled[numTimer] = true;
}
void SimpleTimer::disable(int numTimer) {
if (numTimer >= MAX_TIMERS) {
return;
}
enabled[numTimer] = false;
}
void SimpleTimer::toggle(int numTimer) {
if (numTimer >= MAX_TIMERS) {
return;
}
enabled[numTimer] = !enabled[numTimer];
}
int SimpleTimer::getNumTimers() {
return numTimers;
}