Reducing power consumption

AloyseTech · October 14, 2016, 10:45am

Try to remove the pin initialization in wiring.c

arduino/ArduinoCore-samd/blob/master/cores/arduino/wiring.c#L85


      
            PM->APBCMASK.reg |= PM_APBCMASK_SERCOM0 | PM_APBCMASK_SERCOM1 | PM_APBCMASK_SERCOM2 | PM_APBCMASK_SERCOM3 | PM_APBCMASK_SERCOM4 | PM_APBCMASK_SERCOM5 ;
          
          
  // Clock TC/TCC for Pulse and Analog
            PM->APBCMASK.reg |= PM_APBCMASK_TCC0 | PM_APBCMASK_TCC1 | PM_APBCMASK_TCC2 | PM_APBCMASK_TC3 | PM_APBCMASK_TC4 | PM_APBCMASK_TC5 ;
          
          
  // Clock ADC/DAC for Analog
            PM->APBCMASK.reg |= PM_APBCMASK_ADC | PM_APBCMASK_DAC ;
          
          
// Defining VERY_LOW_POWER breaks Arduino APIs since all pins are considered INPUT at startup
          // However, it really lowers the power consumption by a factor of 20 in low power mode (0.03mA vs 0.6mA)
          #ifndef VERY_LOW_POWER
            // Setup all pins (digital and analog) in INPUT mode (default is nothing)
            for (uint32_t ul = 0 ; ul < NUM_DIGITAL_PINS ; ul++ )
            {
              pinMode( ul, INPUT ) ;
            }
          #endif
          
          
  // Initialize Analog Controller
            // Setting clock
            while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);

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Reducing power consumption

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