Arduino for STM32

technically it shouldn't be done, but that it still works having both of them connected as both of them are 5v

in Linux run dmesg look for the vid/pid when your stm32duino or libmaple (roger's core) device is connected. That same vid/pid needs to be in the udev config file. you can have multiple different definitions for different vid/pids. restart udev or restart your pc and make sure you have selected USB ...

in stm32 VREFINT is a fixed voltage measured off a constant voltage source. if that is what you want to read, you may be able to read that using analogRead(). https://github.com/stm32duino/wiki/wiki/API#adc-internal-channels stm32 ADCs don't have a feature that set a vref as like a comparator. Check...

just 2 cents, i'm somewhat got used to an idiom with timers void setup() { Timer->pause(); Timer->setOverflow( dur); Timer->setCaptureCompare(ch, ticks); Timer->attachInterrupt(fn); Timer->refresh(); Timer->resume(); } If a missed period isn't all that important e.g. in a PWM situation or timer call...

take a look in the ref manual RM0008 and some app notes https://www.st.com/resource/en/reference_manual/cd00171190-stm32f101xx-stm32f102xx-stm32f103xx-stm32f105xx-and-stm32f107xx-advanced-arm-based-32-bit-mcus-stmicroelectronics.pdf https://www.st.com/resource/en/programming_manual/pm0075-stm32f10xx...

it is in the Wiki in the FAQ https://github.com/stm32duino/wiki/wiki/FAQ#linux https://github.com/stm32duino/wiki/wiki/FAQ#usb-serial-cdc-stalls-initially-and-connecting-using-a-serial-monitor-fails create a udev rules file e.g. /etc/udev/rules.d/45-stm32duino.rules add a line like ATTRS{idProduct}=...

just 2 cents, if you are changing all the bits in one go, you may as well use ODR.
for BSRR, to do the same, it may be 2 transactions, first reset all bits, then set the bits again separately.

the alternate would be to do things like

among the things you can try, you can look at this https://www.stm32duino.com/viewtopic.php?p=9868#p9868 post in the thread or alternatively, you can try the FYSETC_S6 variant https://github.com/stm32duino/Arduino_Core_STM32/blob/main/variants/STM32F4xx/F446V%28C-E%29T/variant_FYSETC_S6.cpp the main...

the FPU is normally already enabled, in both official STM and libmaple based cores.
Accordingly, it helps to put that enable_fpu code in its own .cpp file, then include the definition and include it from a #include

my apologies, i'm off tracked. out of curiosity i took a look at the schematics https://github.com/bigtreetech/BIGTREETECH-OCTOPUS-V1.0/blob/master/Hardware/BIGTREETECH%20Octopus.pdf it is using the stm32f446zet6 if you used the F446Z(C-E)(H-J-T) variant https://github.com/stm32duino/Arduino_Core_ST...