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Aurelian Lazarut
Aurelian Lazarut
Associate II
August 22, 2018
Question

SigFox stack for B-l072Z-LRWAN1 - warnings when compiling cubeMX examples

  • August 22, 2018
  • 3 replies
  • 802 views

I'm using the examples for SigFox stack for B-l072Z-LRWAN1 - with Atollic Studio as IDE

After converting the project from SW4STM32 to Atollic (there is a project import built in) - when compiling the code for the push_button application I'm getting a dozen warnings like

/../../../../../../../Drivers/STM32L0xx_HAL_Driver/Inc/stm32l0xx_ll_spi.h:1133:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

  *((__IO uint16_t *)&SPIx->DR) = TxData;

Are these these warnings harmless? They look pretty serious to me.

Thanks,

Aurelian

PS- the board hangs when trying to transmit.

    This topic has been closed for replies.

    3 replies

    Aurelian Lazarut
    Aurelian LazarutAuthor
    Associate II
    August 22, 2018

    Just to add more info

    The examples for LoraWan are compiling and working out of the box (same IDE same procedure for importing the project from SW4STM32 int Atollic TrueStudio IDE) - the B-I0072Z-LRAN1 works no problem, hardware is ok, but the Sigfox examples are not. Maybe someone from ST/Murata wants to look into this one.

    How to reproduce -

    Download stock STM32CubeExpansion_SFOX_V1.1.0

    Import the Sigfox_pushbutton example into Atollic TrueStudio for STM32 (V9.0)

    Chose the STM32L072 as target

    Compile

    Aurelian

    Tesla DeLorean
    Tesla DeLorean
    Guru
    August 22, 2018

    >>Are these these warnings harmless? They look pretty serious to me.

    This one is just the stupid GNU/GCC compiler. The explicit casting is to force a 16-bit access to the register.

    #FashionPolice​ 

    Tips, Buy me a coffee, or three.. PayPal VenmoUp vote any posts that you find helpful, it shows what's working..
    Aurelian Lazarut
    Aurelian LazarutAuthor
    Associate II
    August 22, 2018

    maybe you're right - but the examples are hanging when trying to transmit a Sigfox packet (and I'm not willing to touch /STM32L0xx_HAL_Driver/Inc/stm32l0xx_ll_spi.h just to keep GCC happy.

    It could be unrelated and the Sigfox transmission is hanging for a different reason.

    More info -

    I switched the IDE to the SW4STM32 (the example provided is for this IDE) - and the warnings are still there.

    The good news is the warnings are harmless.

    The problem was hardware - the B-L072zlrwan1 has some hardware links to be soldered in order for the Sigfox example to work (it in the docs on the bottom)

    these links are

    SB26 (requires soldering)

    SB13 (requires soldering)

    Jumper J9 to be on 1-2 position closed

    This is clarified on the following doc at page 26

    https://my.st.com/content/ccc/resource/technical/document/user_manual/group0/d6/6e/d3/e4/72/90/49/bf/DM00406670/files/DM00406670.pdf/jcr:content/translations/en.DM00406670.pdf

    Have Fun,

    Aurelian

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