Hello Alan, Thank you for your response. The arm_pminitialize function exists, but contains no logic Viewing implementations of that functions on other boards, they are mostly empty as well, with a couple also including led_pminitialize functions and/or pmbutton functions. As I am not (currently) using push buttons to wake from sleep nor am I using the LEDs to monitor the power manager, I do not think that logic is applicable.
Thank you for your help, Jesse Jensen (he, him, his) Geotab Embedded Engineer Direct Toll-free Visit +1 (702) 409-1041 +1 (800) 397-7102 www.geotab.com Twitter <https://twitter.com/geotab> | Facebook <https://www.facebook.com/Geotab> | YouTube <https://www.youtube.com/user/MyGeotab> | LinkedIn <https://www.linkedin.com/company/geotab/> On Tue, Jun 14, 2022 at 12:00 PM Jesse Jensen <jessejen...@geotab.com> wrote: > Hello, > > I am using the STM32L4 (nucleo-l476rg board) and am attempting to enter > the mcu's low-power modes (i.e. Stop1, Stop2, Standby). Within stm32_idle.c > under PM_IDLE, I send the "wfi" command to send the device into sleep. > However, when measuring the current draw of the mcu, I can see that the > device is drawing much more power than it should be from any of the > low-power modes. It appears that it is either not entering the low-power > modes or is quickly woken out of them. I have enabled Tickless OS using its > interval timer to prevent scheduler interrupts that would bring the device > out of lp modes. Is there something that I am missing? > > Below are my configurations that seemed relevant to the problem at hand. > > CONFIG_STM32L4_TIM2=y > CONFIG_STM32L4_TIM5=y > > # > # Timer Configuration > # > CONFIG_STM32L4_ONESHOT=y > CONFIG_STM32L4_FREERUN=y > CONFIG_STM32L4_TICKLESS_ONESHOT=2 > CONFIG_STM32L4_TICKLESS_FREERUN=5 > CONFIG_STM32L4_ONESHOT_MAXTIMERS=1 > > # > # Clocks and Timers > # > CONFIG_ARCH_HAVE_TICKLESS=y > CONFIG_SCHED_TICKLESS=y > # CONFIG_SCHED_TICKLESS_ALARM is not set > CONFIG_SCHED_TICKLESS_LIMIT_MAX_SLEEP=y > CONFIG_USEC_PER_TICK=10000 > # CONFIG_SYSTEM_TIME64 is not set > # CONFIG_ARCH_HAVE_TIMEKEEPING is not set > # CONFIG_JULIAN_TIME is not set > CONFIG_START_YEAR=2018 > CONFIG_START_MONTH=1 > CONFIG_START_DAY=1 > CONFIG_PREALLOC_TIMERS=4 > > # > # Buffering > # > # CONFIG_DRVR_WRITEBUFFER is not set > # CONFIG_DRVR_READAHEAD is not set > # CONFIG_ARCH_HAVE_SDIO is not set > # CONFIG_ARCH_HAVE_SDIOWAIT_WRCOMPLETE is not set > # CONFIG_ARCH_HAVE_SDIO_PREFLIGHT is not set > # CONFIG_MMCSD is not set > # CONFIG_MODEM is not set > # CONFIG_MTD is not set > # CONFIG_EEPROM is not set > # CONFIG_EFUSE is not set > # CONFIG_PIPES is not set > CONFIG_PM=y > CONFIG_PM_NDOMAINS=1 > CONFIG_PM_GOVERNOR_GREEDY=y > # CONFIG_PM_GOVERNOR_ACTIVITY is not set > > # > # Governor options > # > CONFIG_SERIAL_PM_ACTIVITY_DOMAIN=0 > CONFIG_SERIAL_PM_ACTIVITY_PRIORITY=6 > > As a side note, I noticed that the tickless OS interval and freerunning > timers for the nucleo-l476rg seems to only support TIM channels, and not > LPTIM. As the TIM channels are not operational during low-power modes, will > I be unable to use the tickless OS interval timer without rewriting the > code that is done to set up the tickless oneshot timer? > > Any support on this would be greatly appreciated, > > Jesse Jensen (he, him, his) > Geotab > > Embedded Engineer > > Direct > Toll-free > > Visit > > +1 (702) 409-1041 > +1 (800) 397-7102 > www.geotab.com > > Twitter <https://twitter.com/geotab> | Facebook > <https://www.facebook.com/Geotab> | YouTube > <https://www.youtube.com/user/MyGeotab> | LinkedIn > <https://www.linkedin.com/company/geotab/> >
