I am trying to set the Arduino MEGA 2560 R3 into sleep mode and wake it up with an RTC DS3231 via interrupt. I was following this tutorial: Tutorial
One of the libraries included is the "LowPower" library, you can find it here on GitHub. It produces the following error while compiling:
C:\XX\Arduino\libraries\Low-Power-master\LowPower.cpp: In member function 'void LowPowerClass::idle(period_t, adc_t, timer5_t, timer4_t, timer3_t, timer2_t, timer1_t, timer0_t, spi_t, usart3_t, usart2_t, usart1_t, usart0_t, twi_t)': C:\XX\Arduino\libraries\Low-Power-master\LowPower.cpp:562:49: error: 'power_usart3_disable' was not declared in this scope if (usart3 == USART3_OFF) power_usart3_disable(); ^ C:\XX\Arduino\libraries\Low-Power-master\LowPower.cpp:597:48: error: 'power_usart3_enable' was not declared in this scope if (usart3 == USART3_OFF) power_usart3_enable(); ^ exit status 1 Error while compiling for Arduino/Genuino Mega or Mega 2560.
I dont understand why there should be any functions in the library, which are not declared...This would mean noone could use it?! I am not an expert in C++ so maybe one of you could tell me what the issue could be. I am glad for any help.