Hello
Currently having issues while trying to wake-up the part with RTC wake-up timer from deep sleep.
If this occurs first after cold start (i.e. entering sleep first time after power on), the delay before wakeup is abnormally long (around 1.5-2s) regardless of time set to wakeup (in my case i try to set wakeup after 100mS). However if i try to enter sleep first time after brief reset (reset pin held for ~0.5s), without disabling VCC, wakeup occurs at relatively expected time. But if reset pin is held for longer times - sleep time also skews and becomes longer.
When issue occurs it's regardless of RTC clock source - neither XTAL32K, nor FRO32K make any difference and issue can be reproduced on custom board as well as on LPCXpresso55S28 rev A2.
Using SDK 2.11.0
power_manager_lpc.c example only uses RTC alarm which i assume only allows 1 second precision for wakeup, while i need subsecond precision for wakeup. OS Event timer wakeup has similar issue where sleep time occurs the same way. Trying to monitor this issue via debugger only makes sleep work as intended so it's difficult to point out at which stage of POWER_EnterDeepSleep occurs.
In my test project i set up one pin (TEST) to be set high on start, set low before entering sleep and set high after exiting sleep. Other pin is set as CLKOUT and outputs expected 1MHz (FRO12/12) during active mode.
Am i missing something obvious?
