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dumped all my old arduino stuff in here.

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This commit is contained in:
Johannes Findeisen 2015-08-15 23:03:28 +02:00
commit 8f8959b76f
76 changed files with 8127 additions and 2 deletions
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libraries/FrequencyTimer2/FrequencyTimer2.cpp Normal file
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/*
FrequencyTimer2.h - A frequency generator and interrupt generator library
Author: Jim Studt, jim@federated.com
Copyright (c) 2007 David A. Mellis. All right reserved.
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 <FrequencyTimer2.h>
#include <avr/interrupt.h>
void (*FrequencyTimer2::onOverflow)() = 0;
uint8_t FrequencyTimer2::enabled = 0;
#if defined(__AVR_ATmega168__)
SIGNAL(SIG_OUTPUT_COMPARE2A)
#else
SIGNAL(SIG_OUTPUT_COMPARE2)
#endif
{
static uint8_t inHandler = 0; // protect us from recursion if our handler enables interrupts
if ( !inHandler && FrequencyTimer2::onOverflow) {
inHandler = 1;
(*FrequencyTimer2::onOverflow)();
inHandler = 0;
}
}
void FrequencyTimer2::setOnOverflow( void (*func)() )
{
FrequencyTimer2::onOverflow = func;
#if defined(__AVR_ATmega168__)
if ( func) TIMSK2 |= _BV(OCIE2A);
else TIMSK2 &= ~_BV(OCIE2A);
#else
if ( func) TIMSK |= _BV(OCIE2);
else TIMSK &= ~_BV(OCIE2);
#endif
}
void FrequencyTimer2::setPeriod(unsigned long period)
{
uint8_t pre, top;
if ( period == 0) period = 1;
period *= clockCyclesPerMicrosecond();
period /= 2; // we work with half-cycles before the toggle
if ( period <= 256) {
pre = 1;
top = period-1;
} else if ( period <= 256L*8) {
pre = 2;
top = period/8-1;
} else if ( period <= 256L*32) {
pre = 3;
top = period/32-1;
} else if ( period <= 256L*64) {
pre = 4;
top = period/64-1;
} else if ( period <= 256L*128) {
pre = 5;
top = period/128-1;
} else if ( period <= 256L*256) {
pre = 6;
top = period/256-1;
} else if ( period <= 256L*1024) {
pre = 7;
top = period/1024-1;
} else {
pre = 7;
top = 255;
}
#if defined(__AVR_ATmega168__)
TCCR2B = 0;
TCCR2A = 0;
TCNT2 = 0;
ASSR &= ~_BV(AS2); // use clock, not T2 pin
OCR2A = top;
TCCR2A = (_BV(WGM21) | ( FrequencyTimer2::enabled ? _BV(COM2A0) : 0));
TCCR2B = pre;
#else
TCCR2 = 0;
TCNT2 = 0;
ASSR &= ~_BV(AS2); // use clock, not T2 pin
OCR2 = top;
TCCR2 = (_BV(WGM21) | ( FrequencyTimer2::enabled ? _BV(COM20) : 0) | pre);
#endif
}
unsigned long FrequencyTimer2::getPeriod()
{
#if defined(__AVR_ATmega168__)
uint8_t p = (TCCR2B & 7);
unsigned long v = OCR2A;
#else
uint8_t p = (TCCR2 & 7);
unsigned long v = OCR2;
#endif
uint8_t shift;
switch(p) {
case 0 ... 1:
shift = 0;
break;
case 2:
shift = 3;
break;
case 3:
shift = 5;
break;
case 4:
shift = 6;
break;
case 5:
shift = 7;
break;
case 6:
shift = 8;
break;
case 7:
shift = 10;
break;
}
return (((v+1) << (shift+1)) + 1) / clockCyclesPerMicrosecond(); // shift+1 converts from half-period to period
}
void FrequencyTimer2::enable()
{
FrequencyTimer2::enabled = 1;
#if defined(__AVR_ATmega168__)
TCCR2A |= _BV(COM2A0);
#else
TCCR2 |= _BV(COM20);
#endif
}
void FrequencyTimer2::disable()
{
FrequencyTimer2::enabled = 0;
#if defined(__AVR_ATmega168__)
TCCR2A &= ~_BV(COM2A0);
#else
TCCR2 &= ~_BV(COM20);
#endif
}