![]() Nearly everything in my program is being driven by interrupts (its a hard, real-time application), and the sleep logic was in a cpp file (which had #include "Arduino") in a routine that was triggered by a button-click interrupt. Basically, sleep_cpu() needs to be inside loop(), otherwise nothing about it works properly. It's taken a bit of tracking-down, but I've found the answer. There are probably better ways than the delay to ensure the buffer is clean before the sleep. RTC.CLKSEL = RTC_CLKSEL_INT1K_gc // Run low power oscillator (OSCULP32K) at 1024Hz The Serial buffer does not survive a sleep. Sleep_cpu() // Sleep the device and wait for an interrupt to continue Sleep_enable() // Enable sleep mode, but not going to sleep yetÄigitalWrite(LED_BUILTIN, HIGH) // turn the LED on (HIGH is the voltage level)ÄigitalWrite(LED_BUILTIN, LOW) // turn the LED off by making the voltage LOW ![]() Set_sleep_mode(SLEEP_MODE_PWR_DOWN) // Set sleep mode to POWER DOWN mode RTC.PITINTFLAGS = RTC_PI_bm // Clear interrupt flag by writing '1' (required) RTC.PITCTRLA = RTC_PERIOD_CYC8192_gc | RTC_PITEN_bm // Set period 8 seconds (see data sheet) and enable PIC RTC.PITINTCTRL = RTC_PI_bm // PIT Interrupt: enabled */ RTC.CLKSEL = RTC_CLKSEL_INT1K_gc // Run low power oscillator (OSCULP32K) at 1024Hz for long term sleep While (RTC.STATUS > 0) /* Wait for all register to be synchronized */ Nano Every: Cycle of Blink 5 times then Sleep for 8 secondsĬonfiguration option: No ATmega328P Register emulation It performs a cycle of blinking 5 times, then sleeping for 8 seconds. If not, put together a very simple sketch for the old Nano which simply demonstrates forcing it to sleep and waking afterwards and I (or someone else) may give you some pointers to convert it for the Nano Every. Probably, the PIT (periodic Interrupt timer) is the best in your case if you need the Power Down sleep mode. This chip has an RTC peripheral and you have to configure this by register entries. Sleep mode handling is completely different, and much more flexible, with the ATmega4809 on which the new Nano Every is based. This last link talks about turning off various timers and interrupts, but doesn't tell one if they get turned back on after returning from sleep. The documentation I have found has a lot of "if you screw this up you can brick your device" and a lot of language referring to CPU registers, a place the inexperienced should avoid. The information on that page is inadequate and makes the useless reference "Refer to the datasheet for the details relating to the device you are using" The closed topic " Arduino Nano Every" links to " avr-libc: : Power Management and Sleep Modes". The "LowPower.h" library doesn't work on the Every. Granted the max sleep time is 8s, but you can string those 8s together with only being powered up for a few uSecs between them. LowPower.h provides a simple way to power down the non-mega CPUs. My question is pretty much the same closed question at Sleep Mode Atmega4809 Arduino Nano Every I have this running on an older Nano and radio. My project is a soil moisture sensor, powered by a battery, that is charged with a solar panel, sending data over ethernet-over-nRF24l01 radio (parts under $25, without housing $?) to an MQTT broker (RPi).
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