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/*******************************************************************************
* LowPower Library
* Version: 1.30
* Date: 22-05-2013
* Company: Rocket Scream Electronics
* Website: www.rocketscream.com
*
* This is a lightweight low power library for Arduino. Please check our wiki
* (www.rocketscream.com/wiki) for more information on using this piece of
* library.
*
* This library is licensed under Creative Commons Attribution-ShareAlike 3.0
* Unported License.
*
* Revision Description
* ======== ===========
* 1.30 Added support for ATMega168, ATMega2560, ATMega1280 & ATMega32U4.
* Tested to work with Arduino IDE 1.0.1 - 1.0.4.
* 1.20 Remove typo error in idle method for checking whether Timer 0 was
* turned off.
* Remove dependecy on WProgram.h which is not required.
* Tested to work with Arduino IDE 1.0.
* 1.10 Added #ifndef for sleep_bod_disable() for compatibility with future
* Arduino IDE release.
* 1.00 Initial public release.
*******************************************************************************/
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <avr/power.h>
#include <avr/interrupt.h>
#include "LowPower.h"
// Only Pico Power devices can change BOD settings through software
#if defined __AVR_ATmega328P__
#ifndef sleep_bod_disable
#define sleep_bod_disable() \
do { \
unsigned char tempreg; \
__asm__ __volatile__("in %[tempreg], %[mcucr]" "\n\t" \
"ori %[tempreg], %[bods_bodse]" "\n\t" \
"out %[mcucr], %[tempreg]" "\n\t" \
"andi %[tempreg], %[not_bodse]" "\n\t" \
"out %[mcucr], %[tempreg]" \
: [tempreg] "=&d" (tempreg) \
: [mcucr] "I" _SFR_IO_ADDR(MCUCR), \
[bods_bodse] "i" (_BV(BODS) | _BV(BODSE)), \
[not_bodse] "i" (~_BV(BODSE))); \
} while (0)
#endif
#endif
#define lowPowerBodOn(mode) \
do { \
set_sleep_mode(mode); \
cli(); \
sleep_enable(); \
sei(); \
sleep_cpu(); \
sleep_disable(); \
sei(); \
} while (0);
// Only Pico Power devices can change BOD settings through software
#if defined __AVR_ATmega328P__
#define lowPowerBodOff(mode)\
do { \
set_sleep_mode(mode); \
cli(); \
sleep_enable(); \
sleep_bod_disable(); \
sei(); \
sleep_cpu(); \
sleep_disable(); \
sei(); \
} while (0);
#endif
// Some macros is still missing from AVR GCC distribution for ATmega32U4
#if defined __AVR_ATmega32U4__
// Timer 4 PRR bit is currently not defined in iom32u4.h
#ifndef PRTIM4
#define PRTIM4 4
#endif
// Timer 4 power reduction macro is not defined currently in power.h
#ifndef power_timer4_disable
#define power_timer4_disable() (PRR1 |= (uint8_t)(1 << PRTIM4))
#endif
#ifndef power_timer4_enable
#define power_timer4_enable() (PRR1 &= (uint8_t)~(1 << PRTIM4))
#endif
#endif
/*******************************************************************************
* Name: idle
* Description: Putting ATmega328P/168 into idle state. Please make sure you
* understand the implication and result of disabling module.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control:
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. timer2 Timer 2 module disable control:
* (a) TIMER2_OFF - Turn off Timer 2 module
* (b) TIMER2_ON - Leave Timer 2 module in its default state
*
* 4. timer1 Timer 1 module disable control:
* (a) TIMER1_OFF - Turn off Timer 1 module
* (b) TIMER1_ON - Leave Timer 1 module in its default state
*
* 5. timer0 Timer 0 module disable control:
* (a) TIMER0_OFF - Turn off Timer 0 module
* (b) TIMER0_ON - Leave Timer 0 module in its default state
*
* 6. spi SPI module disable control:
* (a) SPI_OFF - Turn off SPI module
* (b) SPI_ON - Leave SPI module in its default state
*
* 7. usart0 USART0 module disable control:
* (a) USART0_OFF - Turn off USART0 module
* (b) USART0_ON - Leave USART0 module in its default state
*
* 8. twi TWI module disable control:
* (a) TWI_OFF - Turn off TWI module
* (b) TWI_ON - Leave TWI module in its default state
*
*******************************************************************************/
#if defined (__AVR_ATmega328P__) || defined (__AVR_ATmega168__)
void LowPowerClass::idle(period_t period, adc_t adc, timer2_t timer2,
timer1_t timer1, timer0_t timer0,
spi_t spi, usart0_t usart0, twi_t twi)
{
// Temporary clock source variable
unsigned char clockSource = 0;
if (timer2 == TIMER2_OFF)
{
if (TCCR2B & CS22) clockSource |= (1 << CS22);
if (TCCR2B & CS21) clockSource |= (1 << CS21);
if (TCCR2B & CS20) clockSource |= (1 << CS20);
// Remove the clock source to shutdown Timer2
TCCR2B &= ~(1 << CS22);
TCCR2B &= ~(1 << CS21);
TCCR2B &= ~(1 << CS20);
power_timer2_disable();
}
if (adc == ADC_OFF)
{
ADCSRA &= ~(1 << ADEN);
power_adc_disable();
}
if (timer1 == TIMER1_OFF) power_timer1_disable();
if (timer0 == TIMER0_OFF) power_timer0_disable();
if (spi == SPI_OFF) power_spi_disable();
if (usart0 == USART0_OFF) power_usart0_disable();
if (twi == TWI_OFF) power_twi_disable();
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
lowPowerBodOn(SLEEP_MODE_IDLE);
if (adc == ADC_OFF)
{
power_adc_enable();
ADCSRA |= (1 << ADEN);
}
if (timer2 == TIMER2_OFF)
{
if (clockSource & CS22) TCCR2B |= (1 << CS22);
if (clockSource & CS21) TCCR2B |= (1 << CS21);
if (clockSource & CS20) TCCR2B |= (1 << CS20);
power_timer2_enable();
}
if (timer1 == TIMER1_OFF) power_timer1_enable();
if (timer0 == TIMER0_OFF) power_timer0_enable();
if (spi == SPI_OFF) power_spi_enable();
if (usart0 == USART0_OFF) power_usart0_enable();
if (twi == TWI_OFF) power_twi_enable();
}
#endif
/*******************************************************************************
* Name: idle
* Description: Putting ATmega32U4 into idle state. Please make sure you
* understand the implication and result of disabling module.
* Take note that Timer 2 is not available and USART0
* is replaced with USART1 on ATmega32U4.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control:
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. timer4 Timer 4 module disable control:
* (a) TIMER4_OFF - Turn off Timer 4 module
* (b) TIMER4_ON - Leave Timer 4 module in its default state
*
* 4. timer3 Timer 3 module disable control:
* (a) TIMER3_OFF - Turn off Timer 3 module
* (b) TIMER3_ON - Leave Timer 3 module in its default state
*
* 5. timer1 Timer 1 module disable control:
* (a) TIMER1_OFF - Turn off Timer 1 module
* (b) TIMER1_ON - Leave Timer 1 module in its default state
*
* 6. timer0 Timer 0 module disable control:
* (a) TIMER0_OFF - Turn off Timer 0 module
* (b) TIMER0_ON - Leave Timer 0 module in its default state
*
* 7. spi SPI module disable control:
* (a) SPI_OFF - Turn off SPI module
* (b) SPI_ON - Leave SPI module in its default state
*
* 8. usart1 USART1 module disable control:
* (a) USART1_OFF - Turn off USART1 module
* (b) USART1_ON - Leave USART1 module in its default state
*
* 9. twi TWI module disable control:
* (a) TWI_OFF - Turn off TWI module
* (b) TWI_ON - Leave TWI module in its default state
*
* 10.usb USB module disable control:
* (a) USB_OFF - Turn off USB module
* (b) USB_ON - Leave USB module in its default state
*******************************************************************************/
#if defined __AVR_ATmega32U4__
void LowPowerClass::idle(period_t period, adc_t adc,
timer4_t timer4, timer3_t timer3,
timer1_t timer1, timer0_t timer0,
spi_t spi, usart1_t usart1, twi_t twi, usb_t usb)
{
if (adc == ADC_OFF)
{
ADCSRA &= ~(1 << ADEN);
power_adc_disable();
}
if (timer4 == TIMER4_OFF) power_timer4_disable();
if (timer3 == TIMER3_OFF) power_timer3_disable();
if (timer1 == TIMER1_OFF) power_timer1_disable();
if (timer0 == TIMER0_OFF) power_timer0_disable();
if (spi == SPI_OFF) power_spi_disable();
if (usart1 == USART1_OFF) power_usart1_disable();
if (twi == TWI_OFF) power_twi_disable();
if (usb == USB_OFF) power_usb_disable();
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
lowPowerBodOn(SLEEP_MODE_IDLE);
if (adc == ADC_OFF)
{
power_adc_enable();
ADCSRA |= (1 << ADEN);
}
if (timer4 == TIMER4_OFF) power_timer4_enable();
if (timer3 == TIMER3_OFF) power_timer3_enable();
if (timer1 == TIMER1_OFF) power_timer1_enable();
if (timer0 == TIMER0_OFF) power_timer0_enable();
if (spi == SPI_OFF) power_spi_enable();
if (usart1 == USART1_OFF) power_usart1_enable();
if (twi == TWI_OFF) power_twi_enable();
if (usb == USB_OFF) power_usb_enable();
}
#endif
/*******************************************************************************
* Name: idle
* Description: Putting ATmega2560 & ATmega1280 into idle state. Please make sure
* you understand the implication and result of disabling module.
* Take note that extra Timer 5, 4, 3 compared to an ATmega328P/168.
* Also take note that extra USART 3, 2, 1 compared to an
* ATmega328P/168.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control:
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. timer5 Timer 5 module disable control:
* (a) TIMER5_OFF - Turn off Timer 5 module
* (b) TIMER5_ON - Leave Timer 5 module in its default state
*
* 4. timer4 Timer 4 module disable control:
* (a) TIMER4_OFF - Turn off Timer 4 module
* (b) TIMER4_ON - Leave Timer 4 module in its default state
*
* 5. timer3 Timer 3 module disable control:
* (a) TIMER3_OFF - Turn off Timer 3 module
* (b) TIMER3_ON - Leave Timer 3 module in its default state
*
* 6. timer2 Timer 2 module disable control:
* (a) TIMER2_OFF - Turn off Timer 2 module
* (b) TIMER2_ON - Leave Timer 2 module in its default state
*
* 7. timer1 Timer 1 module disable control:
* (a) TIMER1_OFF - Turn off Timer 1 module
* (b) TIMER1_ON - Leave Timer 1 module in its default state
*
* 8. timer0 Timer 0 module disable control:
* (a) TIMER0_OFF - Turn off Timer 0 module
* (b) TIMER0_ON - Leave Timer 0 module in its default state
*
* 9. spi SPI module disable control:
* (a) SPI_OFF - Turn off SPI module
* (b) SPI_ON - Leave SPI module in its default state
*
* 10.usart3 USART3 module disable control:
* (a) USART3_OFF - Turn off USART3 module
* (b) USART3_ON - Leave USART3 module in its default state
*
* 11.usart2 USART2 module disable control:
* (a) USART2_OFF - Turn off USART2 module
* (b) USART2_ON - Leave USART2 module in its default state
*
* 12.usart1 USART1 module disable control:
* (a) USART1_OFF - Turn off USART1 module
* (b) USART1_ON - Leave USART1 module in its default state
*
* 13.usart0 USART0 module disable control:
* (a) USART0_OFF - Turn off USART0 module
* (b) USART0_ON - Leave USART0 module in its default state
*
* 14.twi TWI module disable control:
* (a) TWI_OFF - Turn off TWI module
* (b) TWI_ON - Leave TWI module in its default state
*
*******************************************************************************/
#if defined (__AVR_ATmega2560__) || defined (__AVR_ATmega1280__)
void LowPowerClass::idle(period_t period, adc_t adc, timer5_t timer5,
timer4_t timer4, timer3_t timer3, timer2_t timer2,
timer1_t timer1, timer0_t timer0, spi_t spi,
usart3_t usart3, usart2_t usart2, usart1_t usart1,
usart0_t usart0, twi_t twi)
{
// Temporary clock source variable
unsigned char clockSource = 0;
if (timer2 == TIMER2_OFF)
{
if (TCCR2B & CS22) clockSource |= (1 << CS22);
if (TCCR2B & CS21) clockSource |= (1 << CS21);
if (TCCR2B & CS20) clockSource |= (1 << CS20);
// Remove the clock source to shutdown Timer2
TCCR2B &= ~(1 << CS22);
TCCR2B &= ~(1 << CS21);
TCCR2B &= ~(1 << CS20);
power_timer2_disable();
}
if (adc == ADC_OFF)
{
ADCSRA &= ~(1 << ADEN);
power_adc_disable();
}
if (timer5 == TIMER5_OFF) power_timer5_disable();
if (timer4 == TIMER4_OFF) power_timer4_disable();
if (timer3 == TIMER3_OFF) power_timer3_disable();
if (timer1 == TIMER1_OFF) power_timer1_disable();
if (timer0 == TIMER0_OFF) power_timer0_disable();
if (spi == SPI_OFF) power_spi_disable();
if (usart3 == USART3_OFF) power_usart3_disable();
if (usart2 == USART2_OFF) power_usart2_disable();
if (usart1 == USART1_OFF) power_usart1_disable();
if (usart0 == USART0_OFF) power_usart0_disable();
if (twi == TWI_OFF) power_twi_disable();
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
lowPowerBodOn(SLEEP_MODE_IDLE);
if (adc == ADC_OFF)
{
power_adc_enable();
ADCSRA |= (1 << ADEN);
}
if (timer2 == TIMER2_OFF)
{
if (clockSource & CS22) TCCR2B |= (1 << CS22);
if (clockSource & CS21) TCCR2B |= (1 << CS21);
if (clockSource & CS20) TCCR2B |= (1 << CS20);
power_timer2_enable();
}
if (timer5 == TIMER5_OFF) power_timer5_enable();
if (timer4 == TIMER4_OFF) power_timer4_enable();
if (timer3 == TIMER3_OFF) power_timer3_enable();
if (timer1 == TIMER1_OFF) power_timer1_enable();
if (timer0 == TIMER0_OFF) power_timer0_enable();
if (spi == SPI_OFF) power_spi_enable();
if (usart3 == USART3_OFF) power_usart3_enable();
if (usart2 == USART2_OFF) power_usart2_enable();
if (usart1 == USART1_OFF) power_usart1_enable();
if (usart0 == USART0_OFF) power_usart0_enable();
if (twi == TWI_OFF) power_twi_enable();
}
#endif
/*******************************************************************************
* Name: adcNoiseReduction
* Description: Putting microcontroller into ADC noise reduction state. This is
* a very useful state when using the ADC to achieve best and low
* noise signal.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control. Turning off the ADC module is
* basically removing the purpose of this low power mode.
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. timer2 Timer 2 module disable control:
* (a) TIMER2_OFF - Turn off Timer 2 module
* (b) TIMER2_ON - Leave Timer 2 module in its default state
*
*******************************************************************************/
void LowPowerClass::adcNoiseReduction(period_t period, adc_t adc,
timer2_t timer2)
{
// Temporary clock source variable
unsigned char clockSource = 0;
#if !defined(__AVR_ATmega32U4__)
if (timer2 == TIMER2_OFF)
{
if (TCCR2B & CS22) clockSource |= (1 << CS22);
if (TCCR2B & CS21) clockSource |= (1 << CS21);
if (TCCR2B & CS20) clockSource |= (1 << CS20);
// Remove the clock source to shutdown Timer2
TCCR2B &= ~(1 << CS22);
TCCR2B &= ~(1 << CS21);
TCCR2B &= ~(1 << CS20);
}
#endif
if (adc == ADC_OFF) ADCSRA &= ~(1 << ADEN);
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
lowPowerBodOn(SLEEP_MODE_ADC);
if (adc == ADC_OFF) ADCSRA |= (1 << ADEN);
#if !defined(__AVR_ATmega32U4__)
if (timer2 == TIMER2_OFF)
{
if (clockSource & CS22) TCCR2B |= (1 << CS22);
if (clockSource & CS21) TCCR2B |= (1 << CS21);
if (clockSource & CS20) TCCR2B |= (1 << CS20);
}
#endif
}
/*******************************************************************************
* Name: powerDown
* Description: Putting microcontroller into power down state. This is
* the lowest current consumption state. Use this together with
* external pin interrupt to wake up through external event
* triggering (example: RTC clockout pin, SD card detect pin).
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control. Turning off the ADC module is
* basically removing the purpose of this low power mode.
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. bod Brown Out Detector (BOD) module disable control:
* (a) BOD_OFF - Turn off BOD module
* (b) BOD_ON - Leave BOD module in its default state
*
*******************************************************************************/
void LowPowerClass::powerDown(period_t period, adc_t adc, bod_t bod)
{
if (adc == ADC_OFF) ADCSRA &= ~(1 << ADEN);
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
if (bod == BOD_OFF)
{
#if defined __AVR_ATmega328P__
lowPowerBodOff(SLEEP_MODE_PWR_DOWN);
#else
lowPowerBodOn(SLEEP_MODE_PWR_DOWN);
#endif
}
else
{
lowPowerBodOn(SLEEP_MODE_PWR_DOWN);
}
if (adc == ADC_OFF) ADCSRA |= (1 << ADEN);
}
/*******************************************************************************
* Name: powerSave
* Description: Putting microcontroller into power save state. This is
* the lowest current consumption state after power down.
* Use this state together with an external 32.768 kHz crystal (but
* 8/16 MHz crystal/resonator need to be removed) to provide an
* asynchronous clock source to Timer 2. Please take note that
* Timer 2 is also used by the Arduino core for PWM operation.
* Please refer to wiring.c for explanation. Removal of the external
* 8/16 MHz crystal/resonator requires the microcontroller to run
* on its internal RC oscillator which is not so accurate for time
* critical operation.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control. Turning off the ADC module is
* basically removing the purpose of this low power mode.
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. bod Brown Out Detector (BOD) module disable control:
* (a) BOD_OFF - Turn off BOD module
* (b) BOD_ON - Leave BOD module in its default state
*
* 4. timer2 Timer 2 module disable control:
* (a) TIMER2_OFF - Turn off Timer 2 module
* (b) TIMER2_ON - Leave Timer 2 module in its default state
*
*******************************************************************************/
void LowPowerClass::powerSave(period_t period, adc_t adc, bod_t bod,
timer2_t timer2)
{
// Temporary clock source variable
unsigned char clockSource = 0;
#if !defined(__AVR_ATmega32U4__)
if (timer2 == TIMER2_OFF)
{
if (TCCR2B & CS22) clockSource |= (1 << CS22);
if (TCCR2B & CS21) clockSource |= (1 << CS21);
if (TCCR2B & CS20) clockSource |= (1 << CS20);
// Remove the clock source to shutdown Timer2
TCCR2B &= ~(1 << CS22);
TCCR2B &= ~(1 << CS21);
TCCR2B &= ~(1 << CS20);
}
#endif
if (adc == ADC_OFF) ADCSRA &= ~(1 << ADEN);
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
if (bod == BOD_OFF)
{
#if defined __AVR_ATmega328P__
lowPowerBodOff(SLEEP_MODE_PWR_SAVE);
#else
lowPowerBodOn(SLEEP_MODE_PWR_SAVE);
#endif
}
else
{
lowPowerBodOn(SLEEP_MODE_PWR_SAVE);
}
if (adc == ADC_OFF) ADCSRA |= (1 << ADEN);
#if !defined(__AVR_ATmega32U4__)
if (timer2 == TIMER2_OFF)
{
if (clockSource & CS22) TCCR2B |= (1 << CS22);
if (clockSource & CS21) TCCR2B |= (1 << CS21);
if (clockSource & CS20) TCCR2B |= (1 << CS20);
}
#endif
}
/*******************************************************************************
* Name: powerStandby
* Description: Putting microcontroller into power standby state.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control. Turning off the ADC module is
* basically removing the purpose of this low power mode.
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. bod Brown Out Detector (BOD) module disable control:
* (a) BOD_OFF - Turn off BOD module
* (b) BOD_ON - Leave BOD module in its default state
*
*******************************************************************************/
void LowPowerClass::powerStandby(period_t period, adc_t adc, bod_t bod)
{
if (adc == ADC_OFF) ADCSRA &= ~(1 << ADEN);
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
if (bod == BOD_OFF)
{
#if defined __AVR_ATmega328P__
lowPowerBodOff(SLEEP_MODE_STANDBY);
#else
lowPowerBodOn(SLEEP_MODE_STANDBY);
#endif
}
else
{
lowPowerBodOn(SLEEP_MODE_STANDBY);
}
if (adc == ADC_OFF) ADCSRA |= (1 << ADEN);
}
/*******************************************************************************
* Name: powerExtStandby
* Description: Putting microcontroller into power extended standby state. This
* is different from the power standby state as it has the
* capability to run Timer 2 asynchronously.
*
* Argument Description
* ========= ===========
* 1. period Duration of low power mode. Use SLEEP_FOREVER to use other wake
* up resource:
* (a) SLEEP_15MS - 15 ms sleep
* (b) SLEEP_30MS - 30 ms sleep
* (c) SLEEP_60MS - 60 ms sleep
* (d) SLEEP_120MS - 120 ms sleep
* (e) SLEEP_250MS - 250 ms sleep
* (f) SLEEP_500MS - 500 ms sleep
* (g) SLEEP_1S - 1 s sleep
* (h) SLEEP_2S - 2 s sleep
* (i) SLEEP_4S - 4 s sleep
* (j) SLEEP_8S - 8 s sleep
* (k) SLEEP_FOREVER - Sleep without waking up through WDT
*
* 2. adc ADC module disable control.
* (a) ADC_OFF - Turn off ADC module
* (b) ADC_ON - Leave ADC module in its default state
*
* 3. bod Brown Out Detector (BOD) module disable control:
* (a) BOD_OFF - Turn off BOD module
* (b) BOD_ON - Leave BOD module in its default state
*
* 4. timer2 Timer 2 module disable control:
* (a) TIMER2_OFF - Turn off Timer 2 module
* (b) TIMER2_ON - Leave Timer 2 module in its default state
*
*******************************************************************************/
void LowPowerClass::powerExtStandby(period_t period, adc_t adc, bod_t bod,
timer2_t timer2)
{
// Temporary clock source variable
unsigned char clockSource = 0;
#if !defined(__AVR_ATmega32U4__)
if (timer2 == TIMER2_OFF)
{
if (TCCR2B & CS22) clockSource |= (1 << CS22);
if (TCCR2B & CS21) clockSource |= (1 << CS21);
if (TCCR2B & CS20) clockSource |= (1 << CS20);
// Remove the clock source to shutdown Timer2
TCCR2B &= ~(1 << CS22);
TCCR2B &= ~(1 << CS21);
TCCR2B &= ~(1 << CS20);
}
#endif
if (adc == ADC_OFF) ADCSRA &= ~(1 << ADEN);
if (period != SLEEP_FOREVER)
{
wdt_enable(period);
WDTCSR |= (1 << WDIE);
}
if (bod == BOD_OFF)
{
#if defined __AVR_ATmega328P__
lowPowerBodOff(SLEEP_MODE_EXT_STANDBY);
#else
lowPowerBodOn(SLEEP_MODE_EXT_STANDBY);
#endif
}
else
{
lowPowerBodOn(SLEEP_MODE_EXT_STANDBY);
}
if (adc == ADC_OFF) ADCSRA |= (1 << ADEN);
#if !defined(__AVR_ATmega32U4__)
if (timer2 == TIMER2_OFF)
{
if (clockSource & CS22) TCCR2B |= (1 << CS22);
if (clockSource & CS21) TCCR2B |= (1 << CS21);
if (clockSource & CS20) TCCR2B |= (1 << CS20);
}
#endif
}
/*******************************************************************************
* Name: ISR (WDT_vect)
* Description: Watchdog Timer interrupt service routine. This routine is
* required to allow automatic WDIF and WDIE bit clearance in
* hardware.
*
*******************************************************************************/
ISR (WDT_vect)
{
// WDIE & WDIF is cleared in hardware upon entering this ISR
wdt_disable();
}
LowPowerClass LowPower;
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