After setting everything  in .dts and defconfig, Hello world finally started working.

Thanks for assistance. Do you think its worth creating pull request fwith my changes?

- Aleksandr

21 сент. 2018 г. 11:11 ПП | От: Erwan Gouriou <erwan.gouriou@...> | Сообщение:

Le ven. 21 sept. 2018 à 10:45, <seems.deviant@...> a écrit :

В Чтв, 20/09/2018 в 23:43 +0200, Erwan Gouriou пишет:
> Hi,
>
> Looking to B-L072Z-LRWAN1 user manual, it seems that you can get ST-
> Link VCP using USART2,
> Did you changed the console settings to match this configuration ?
>

In order to answer your question I've inspected the
boards/arm/nucleo_l073rz/nucleo_l073rz_defconfig which has a Virtual
COM Port. And I didn't find any UART-specific configuration
options except for CONFIG_SERIAL, CONFIG_CONSOLE and
CONFIG_UART_CONSOLE that should be specified for a VCP to work
correctly.

You don't have to care about VCP, this is internal to ST-Link chip, just make sure that console is set to uart2(.DTS) and enabled (_defconfig).

Could you point out which options do I need to change/specify?

> Then, fortunately, both boards share the same pin mapping on this
> UART,
> so on this point you should be fine.
>
> Last, one point to check would be the clock settings;
> Dragino uses HSI driven PLL, does this fit with B-L072Z-LRWAN1?
>

Yes, the B-L072Z-LRWAN1 uses the same HSI 16M clock source, that's what
datasheet says.

Great, you should be fine then!

> Cheers
>
>
>
> On Thu, 20 Sep 2018 at 22:16, Aleksandr Makarov <seems.deviant@gmail.
> com> wrote:
> > Hello,
> >
> > I am trying to run Hello World application built for Dragino-LSN50
> > on a
> > B-L072Z-LRWAN1 Dicovery Board. Those two boards both are SM32L0-
> > based
> > and share exactly the same MCU model - SMT32L072CZY.
> >
> > The build process and device flashing work fine, however I can't
> > see a
> > "Hello World!" print on a COM terminal after a reset.
> >
> > A working USART port is the only peripheral I care for now. The
> > USART
> > pin configuration for Dragino LSN50 board should be suitable for
> > L072Z-
> > LRWAN1 as well, though it is not working.
> >
> > Please advice.
> >
> >
> >