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Geoffrey1 · 2022-02-16

I want to wake up from standby for each transition on a wkup pin. For example, on waking, read the wakup pin and set/reset the bit in pwr_cr4. (pin high -> bit high, pin low -> bit low). Is there a race condition ? The reference manual is vague on...

Geoffrey1 · 2020-05-10

Geoffrey1 · 2019-12-13

I have a similar issue to : https://community.st.com/s/question/0D50X00009XkgerSAB/stlinkv2-vcp-115200?t=1576249391369When writing to the virtual com port from OS X Mojave, if I send too much data, the USB port hangs to the point that the one cannot ...

Geoffrey1 · 2018-08-19

I'm using STOP2 with ChibIOS in an extremely low-power device. ChibiOS uses the DWT counter in a few places to have a predictable delay -- a relatively common "trick". The issue is that when entering STOP2 the debug unit is powered down which, if ...

Geoffrey1 · 2018-07-10

Posted on July 10, 2018 at 14:37I've been designing sub-gram boards for data logging on songbirds using the stm32l432. Although mostly I use ultra-low power external RTCs, I recently built a test board using a 4pf 32768 crystal. The question was t...

Geoffrey1 · 2020-01-29

It's not obvious, from your schematic, but you're going to want to bring the reset signal to the stlink connector as well.

Geoffrey1 · 2019-12-30

The stm32l4 can easily do 0.1hz wakeup at under 2 uA (stop 2) and with a bit more effort under 1uA (standby). But, if you don't have experience in writing embedded software and designing low-power hardware getting to those targets will take some r...

Geoffrey1 · 2019-12-28

Without some idea of the pulse rate, it's impossible to give you a reasonable answer. The STM32L4 is a great part -- I've designed data loggers that average 1uA over months -- but you need to define the problem better.

Geoffrey1 · 2019-09-16

I think you might be making this more complicated that it needs to be. The Wakeup pin functionality is for Shutdown/Standby modes. For Stop mode you can just configure the Pin as an interrupt (or event) source. Here was some code I've used for ST...

Geoffrey1 · 2019-05-02

Either your processor is not entering stop mode or something else is using current (e.g. by driving through the pins). It's a lot of work to eliminate all the current "vampires", but this processor is certainly capable of extremely low power operatio...

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