Arduino for STM32

I *think* SD Fat requires more sram than do the 'low end' chips offer. I've tried an implementation running on stm32f103c8 20k sram, libmaple (roger's) core. It works well for a pretty long time, then as the number of files accumulate, the directory list become more verbose. Then one day I had a 'cr...

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've got a defective chip for one, but that for a normal working stm32f103c8 chip, the RTC keeps time for a long time > 1 year on a single cr2032 lithium b...

stm32f103 can be programmed either by: - st-link (SWD) - uart boot mode (need to set boot0) what is strange on the original schematic is that boot0 is pulled up to 3v3 i.e. it is set. which means that the chip will always be in programming mode on reset. I think there'd be a jumper to pull that boot...

for DAPlink, you may need to explore things like openocd https://openocd.org/ I heard about it. It's a CLI-program right? Can ArduinoIDE call it instead of STM32CubeProgrammer CLI? WeActStudio tells me " You can use another ST link to brush the daplink into ST link ". I only find in inter...

for DAPlink, you may need to explore things like openocd https://openocd.org/ STM32Cubeprogrammer is generally made for st-link v2 ++. the main thing about STM32Cubeprogrammer is that it is from ST, and that if one are working in MS Windows, it saves one struggling with driver stacks issues. as othe...

'level shifting' is a nuisance as there are too many cases of needing to interface 3.3v to 5v and vice versa. while looking around for 'solutions' I found this little rather interesting logic gate 74lvc1g17 https://www.ti.com/lit/ds/symlink/sn74lvc1g17.pdf https://assets.nexperia.com/documents/data-...

STM32WB55CE supports USB DFU bootloader, review the relevant specs and docs
https://www.st.com/en/microcontrollers- ... b55ce.html
it doesn't need a separate bootloader.

Alternatively, get a st-link v2 and newer and program away

all the pins are normally GPIO, the alternate functions column are the alternate functions available at those particular pins, so for the gpio pin mux, you actually need to configure the pin mux so that it select the correct alternate function at the pin. If you do not know how to do that, this is d...

STM32ardui in Arduino, it defines a default SPI port. Hence, selection of SPI device is not defined in the API https://www.arduino.cc/reference/en/language/functions/communication/spi/ hence, to an extent this is 'beyond Arduino' to put things in perspective. you need to consider the hardware on st...

for this board, you are trying to 'fit an elephant in a small box'. :lol: If I have to mess with this board/chip, I'd resort to cmake https://github.com/stm32duino/CMake_workspace it may take leaving out lots of components to fit things in there, especially the *sram* usage. it takes *a lot more* th...