STM32L071CB ISRPENDING from disabled SysTick?
Dear All,
some context first:
- STM32L071CB
- Running RTOS (tickless mode)
- SYS Mode - Timebase Source TIM2
- RTOS timebase - LPTIM1
- Execution paused by Breakpoint in a task with highest priority
which is attempting to put the MCPU into STANDBY
In ICSR register I see ISRPENDING 1 and VECTPENDING 0x1F (31 dec)
According to PM0223 when subtracting 16 from VECTPENDING I get
the source of the exception/interrupt; 31 - 16 = 15 -> SysTick | Reserved
(Table 5). But PENDSTSET which should indicate SysTick exception
pending is zero meaning that there is no SysTick exception.
EXTI -> PR register indicates no pending interrupt (all '0').
NVIC -> NVIC_ICPR0 indicates pending interrupt from both TIM2
and LPTIM1.
Am I getting a SysTick exception even though the SysTick is
disabled or am I overlooking / not understanding something?
(We are investigating an issue where putting the MCPU into
STANDBY intermittently fails - program continues after _WFI();)
Thank you