Arduino for STM32

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a few things normally https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout si5351 is a clock generator, after you have set the frequency, u won't need to set it again soon right? mcus (including stm32) runs the firmware from flash, this is one of the main limits, not just the cpu cloc...

use an st-lilnk, you need to connect wires (the SWD) pins, you can leave it connected if you prefer.

another way is to use a usb-uart dongle, the DTR/CTS signal can be 'abused' to toggle boot0 and reset. in the same way you could leave the pins connected if you prefer.

for '3rd party' boot loaders i.e. not there in a bare stm32 some of them are like those discussed e.g. in this sub https://www.stm32duino.com/viewforum.php?f=58 https://github.com/Serasidis/STM32_HID_Bootloader Some of these are personal developments in which the authors contributed them as open sou...

based on the schematics https://github.com/FYSETC/FYSETC-SPIDER/blob/main/hardware/Spider%20V2.2%20SCH.pdf it uses the on-chip usb and the boot0 pin is on a header. so all you need is set boot0 reset and you can upload firmware using the on-chip usb over DFU no additional boot loader is needed. you ...

the codes are in your sources, in stm32 it is only the binaries.

What you are doing isn't very 'different' from apps such as Marlin firmware (for 3d printing). Marlin firmware runs the steppers on hardware timer interrupts. A reason is that if millis() came late for some reasons, perhaps there'd be a blob of molten plastic deposited on the print. So hardware time...

you'd need to look in the specs sheet and ref manual for your chip. normally the APB runs at something like 40 mhz or 80 mhz (max). This could either mean that is about max 'countable' clocks or it may in fact be 1/2 that or lower, e.g. like 20 Mhz. Check in the manuals. Then the gpio ports has max ...

if you write an arduino sketch that jumps to the on-chip DFU rom address it may work. I've never tried and not sure how. but this means in effect, your sketch needs to start the DFU boot loader. There may be other complications as well, e.g. in principle you need to send a "usb reset", i.e...

here you go
https://github.com/stm32duino/STM32Exam ... rement.ino