Arduino for STM32

Again I like to suggest to measure latency by a way, that is independent from software on STM32L432KC.
Can you please show your program?

1) I setup a timer to try to measure external interrupt latency. I measured over 600 clock ticks! Is that right? That's an eternity. I definitly no expert in interrupts on a STM32 ... Are you sure, you can measure interrupt latency with a timer? I would use an oscilloscope in single shot mode trigg...

As preparation for something like a GPS sport logger I tested a round TFT-display. Diameter is 1.28 inch and resolution 240 x 240 pixel, controller GC9A01. I want to know, which font size I need for good readability. Is it ok, to show my sketch here? TFT_eSPI library knows this display-controller, s...

3. ‘Crystal related’ 1) If there are crystals, the unit price increases. Are you planning a production of 1000 boards or more? Or are you talking about a hobby project = one board? A genuine crystal with ±5 ppm or ±10 ppm from distributor costs about 0.50 € A STM32L151 starts at 4.32 €. Why should ...

Q1) Can you recommend a low-power ‘SMPS’? Q2) Is it possible to make 3.3VDC with low power other than 'SMPS'? OK, you are talking about a step-down or buck-converter ... Is it a good idea to use such a part, if you want to read values of an ADC??? From switching there is a noise on power line. Go t...

STM32L is for low power ...
Link to your board?
Is external hardware (sensors, display etc) connected?

the RTC matters if you are using SD-Fat and want to timestamp the files accordingly, e.g. for loggers etc. but that SD-Fat makes for a complex, large development. flash and sram matters, I managed to get that running just well on stm32f103c8 on 'roger's (libmaple) core' At the moment a temperature ...

oh and for stm32f103 the rtc and 'bluepill' (or 'maple mini') type boards, I've used the RTC running on VBAT with the on board external crystal. I used the SimpleRTC.ino on STM32C011. With LSI it's absolutely worse! With LSE I got 4 seconds less in 24 hours (at 24 ~ 25 °C). Schematic of WeActStudio...

Can STM32CubeProgrammer be used to program the Arduino giga that has the STM32H747XI processor. May be you misunderstand something? "Arduino for STM32" means, that you copy link to JSON-file into ArduinoIDE and then install "STM32 MCU based boards" by the board manager of IDE. S...

You had similar question about crystal-less usage before: https://www.stm32duino.com/viewtopic.php?p=13242#p13242 At the beginnig of a project it is a good strategy to define your requirements. To say " I want to make a low-power-board " is not enough! 1. Should the board run by a (recharg...