I2C Sensor Not Working After Deep Sleep

PaulZC · November 25, 2025, 8:55am

You may find some useful clues in the OpenLog Artemis firmware. Link below.

While I was testing that part of the code, I wrote this note:

  //With v2.1 of the core, very bad things happen if the IOMs are disabled.
  //We must leave them enabled: https://github.com/sparkfun/Arduino_Apollo3/issues/412

I hope this helps,
Paul

github.com/sparkfun/OpenLog_Artemis

Firmware/OpenLog_Artemis/lowerPower.ino

75124bb21


      
          void goToSleep(uint32_t sysTicksToSleep)
          {
            printDebug("goToSleep: sysTicksToSleep = " + (String)sysTicksToSleep + "\r\n");
            
          #ifndef noPowerLossProtection // Probably redundant - included just in case detachInterrupt causes badness when it has not been attached
            //Prevent voltage supervisor from waking us from sleep
            detachInterrupt(PIN_POWER_LOSS);
          #endif
          
            //Prevent stop logging button from waking us from sleep
            if (settings.useGPIO32ForStopLogging == true)
            {
              detachInterrupt(PIN_STOP_LOGGING); // Disable the interrupt
              pinMode(PIN_STOP_LOGGING, INPUT); // Remove the pull-up
            }
          
            //Prevent trigger from waking us from sleep
            //(This should be redundant. We should not be going to sleep if triggering is enabled?)
            if (settings.useGPIO11ForTrigger == true)
            {

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I2C Sensor Not Working After Deep Sleep

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