Hi, i’m using the STM32L152 DiscoveryIAR example and freeRTOS V9.0 as base for my Projekt on an STM32L4. especially the File STM32Llowpowertickmanagement.c is interrested for our low power handling. ( https://sourceforge.net/p/freertos/code/HEAD/tree/trunk/FreeRTOS/Demo/CORTEXSTM32L152DiscoveryIAR/STM32Llowpowertickmanagement.c). Now my problem: In “normal” operation everything works fine. I measure the time with a osDelay(500ms) and a toggling pin. But when having a lot of interrups i see a sporadic negavtive jitter of the osDelay down to ~400ms. If the timer input clock is bigger (#define lpCLOCKINPUT_FREQUENCY ( 1000UL )) than the negative jitter happens more times. With moving the interrupt enable aftervTaskStepTick( ulCompleteTickPeriods ); (Line 366) i can reduce/compensate the negative jitter. But what i not understand is why this negativ jitter can happen, because in the “critical” sections the timer is disabled? Thanks

Can you please confirm: 1) This only happens when tickless idle is turned on. 2) The tickless implementation is exactly as per the link you posted above, with no modifications.