Design of STM32C011F6 board with external crystal

[cogentcoder]

Hi All,

I'm designing few boards based on STM32C011F6 and would use STM32duino for firmware and I think, STM32duino also support that MCU too.

However, I'm not sure about few things as I've never designed a board myself, these are:

• Do I need an external crystal to use STM32duino? If yes, what value of external crystal needed?
• Do STM32duino have some configuration file where we can define the clock for HSI/LSI or HSE/LSE?

Intended Applications: I want to use STM32C011F6 for variety of use cases, some variants require only ADC to measure analog voltage (0-3.3V) along with few button input and relay output but other need a timer circuit which should measure minutes for a timer and relay application.

I've asked this question on STM32 community where they told me to ask in this community what is actually supported by STM32duino.

Thanks for any input!

[fpistm]

Hi @cogentcoder

• Do I need an external crystal to use STM32duino? If yes, what value of external crystal needed?

No, it is not mandatory. Internal oscillato are less precise but it works.

• Do STM32duino have some configuration file where we can define the clock for HSI/LSI or HSE/LSE?

STM32C011F6 have already a generic variant defined:
https://github.com/stm32duino/Arduino_Core_STM32/tree/main/variants/STM32C0xx/C011D6Y_C011F(4-6)(P-U)_C031F(4-6)P

So default clock config is already defined here using HSI:

Arduino_Core_STM32/variants/STM32C0xx/C011D6Y_C011F(4-6)(P-U)_C031F(4-6)P/generic_clock.c

Line 25 in 5f34649

WEAK void SystemClock_Config(void)

So simply use the Generic C011F6 variant.

[cogentcoder]

Can this also accommodate an external crystal (8MHz) with generic variant clock codes by some modification or do I need to generate code (from stm32cube) for HSE/LSE which can be adopted to stm32duino codes to make it work?

[fpistm]

It is a weak function . You can redefine it at sketch level and generate it with cubeMX using LL.