Arduino for STM32

Is it possible without STM32F103 'crystal'?

hello. Nice to meet you.
Looking at the circuit diagram, we confirmed that it was implemented without a 'crystal' or 'oscillator'.

Q1) Is it possible to operate without ‘crystal’?
Q2) Is there a way to code in 'Arduino IDE'?

I wonder. help me~.

yes, that is running on HSI (internal RC oscillator), system clock may drift but for some apps it is ok.
I think if you want to do that you can try one of the 'generic' variants in stm core
https://github.com/stm32duino/Arduino_Core_STM32

if you are new to this
it would help to check out the wiki
https://github.com/stm32duino/Arduino_Core_STM32/wiki

@ag123

Thank you for quick response.