About EC.3

EC.3 · 2023-09-22

Hello,I ran the STM32CubeU5\Projects\NUCLEO-U575ZI-Q\Examples_LL\RTC\RTC_ExitStandbyWithWakeUpTimer_Init application, which worked as described in its README.md. After changing the low power mode from STANDBY to STOP0, the RTC interrupt no longer fir...

EC.3 · 2023-09-11

Hello,Is there any specific guidance regarding how to improve wakeup time from the various STOP modes? The U5 Reference Manual mentions that configuring STOPWUCK = 0 will use the MSIS up to 24 MHz, which would be faster than HSI16. I've used that alr...

EC.3 · 2023-09-05

Hello,I have a test app that starts in wake for 5s (with "high" current and GPIO output high) then enters STOP Mode 2 (with "low" current and GPIO output low). It remains in that mode until the EXTI 1 interrupt is triggered by a button press, which w...

EC.3 · 2023-09-01

Hi,I have a test app for the U5, which is intended to sleep for a short period of time and wake for a short period time, not unlike the default PCC Sequence you can see in the CubeIDE IOC. It will toggle an output line when entering STOP3 mode and al...

EC.3 · 2023-08-29

Hello,In a chip like STM32U585CIU6Q, where the VDDUSB is internally connected to the VDD, what is the behavior of the USB circuitry if the VDD is below 3.3V (e.g., at 2V)? Will the USB just stop working without affecting other non-USB functions, or i...

EC.3 · 2023-09-22

Hello @Issamos Here's the code. My STOP0-related changes are associated with the USE_STOP0 macro. Other changes against the original example were just using a U585 *.s and *.ld file, along with LED1 pin mapping and disabling use of SMPS.

EC.3 · 2023-09-19

Thanks @MikaelM I'm now measuring 31us for the button-to-post-__WFE() wakeup time using this code:LL_PWR_SetPowerMode(LL_PWR_STOP0_MODE);LL_LPM_EnableDeepSleep();LL_GPIO_ResetOutputPin(GPIOA, LL_GPIO_PIN_5);__WFE();LL_GPIO_SetOutputPin(GPIOA, LL_GPIO...

EC.3 · 2023-09-18

Hello @MikaelM So I have the PWR_EnterStopMode example using a user button for wakeup, along with __WFE(). I'm using a logic analyzer @ 100MS/s to observe the "LED" toggle output (not an actual LED on my board, just an output), the button used for wa...

EC.3 · 2023-09-14

...it's because STANDBY comes back up from a brownout reset so it's reinitializing - making my interpretation of GPIO behavior incorrect. Yeah, I'll need to spend some more time modifying the example...

EC.3 · 2023-09-14

I found a PWR_EnterStandbyMode project in the same folder as the PWR_EnterStopMode project you mentioned. I got that one running - it happens to use a button to wakeup out of STANDBY. However, when I change LL_PWR_SetPowerMode( LL_PWR_STANDBY_MODE ) ...

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RTC timed wakeup from STANDBY v STOP0

How to shorten wakeup time from STOP mode

EXTI only exits STOP Mode 2 the first time

Run-STOP3 test app only works when running debugger

USB behavior when VDD below 3.3V

Re: RTC timed wakeup from STANDBY v STOP0

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Re: How to shorten wakeup time from STOP mode

Re: How to shorten wakeup time from STOP mode

Re: How to shorten wakeup time from STOP mode