Arduino for STM32

OK, I think I know why.

You use the Pin Name instead of the pin number: Probably, the second constructor could be added to avoid this kind of issue.
Anyway I guess you should have a warning about argument type.

I think @stevestrong is the best member to answer this

My understanding is that his core is more advanced/maintains for STM32F4 compared to Roger's one.

Fine.

Anyway, one time if you need some support, we can meet few hours

Jblb Is it ok ? About your sketch, by default Wire use I2C1 with PB7 (SDA) / PB6 (SCL). So seems you want to use also I2C1 on PB9/PB8 which is fine using setSCL/SDA. For the Wire2 as you already instantiate it with the proper pins, you don't need to re-set the pins using: Wire2.setSCL(PB_10); Wire2...

See the wiki
https://github.com/stm32duino/wiki/wiki ... repository

Hi,
Some fixes have been made on I2C for this issue.
You should try the master.

About PIO, an official integration will be done soon.

So if this not works then this is probably an other issue.
Anyway, as said I could not reproduce so hard to help on this.

Thanks to @ABOSTM issue with ADC3 is solved.

See https://github.com/stm32duino/Arduino_C ... 2/pull/910

Hnestly, I don't know why this not work.
Maybe an issue with the reenumeration.
You can try to change the USBD_ENUM_DELAY value which is set to 10 ms by default.