clang: cast to 'GPIO_TypeDef *' from smaller integer type 'unsigned int' Topic is solved

[wurstnase]

Hi,

I've got ctags with my vim working. But now I get an error:

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cast to 'GPIO_TypeDef *' from smaller integer type 'unsigned int'

In hall_pal_lld.h (in my case for STM32F103) I found

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 /**
  * @brief   Decodes a port identifier from a line identifier.
  */
 #define PAL_PORT(line)                                                      \
   ((GPIO_TypeDef *)(((uint32_t)(line)) & 0xFFFFFFF0U))

a simple

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 #define PAL_PORT(line)                                                      \
   ((GPIO_TypeDef *)((size_t)((uint32_t)(line)) & 0xFFFFFFF0U))

will hide this.

Would this be the right way?

[Giovanni]

I don't see problems with the original code, probably you are just hiding some other problem there.

Giovanni

[steved]

Should it be (GPIO_TypeDef) rather than (GPIO_TypeDef *)?

[wurstnase]

It's simple a palSetLine where this happened.

Just have an idea. Probably clang uses the stdint from my OS instead of the arm cross compiler.

I will check it later.

Btw.: It's not a problem while compiling. Just ctags/clang showing me an error.

[Giovanni]

It is like it is assuming 64 bits pointers, size_t would be 64 bits too.

Giovanni

[wurstnase]

Yes, Right. That's my guess also (stdint from 64bit OS). I will check it tomorrow.


Ah no. Thanks. Pointer related. Not stdint...

[wurstnase]

Well...
After some hours of searching.

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UINTPTR_MAX == UINT64_MAX

I don't have currently an idea how to tell clang that I have 32bit pointer.

As a sidenote: For now I replaced uint32_t with uintptr_t.

[wurstnase]

Finally. The clang needs an extra flag.

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-target arm-none-eabi

[tfAteba]

Hello All,

Nice topic, well investigated, thanks for sharing that with us .

[wurstnase]

I'm using you-complete-me with the YCM-Generator plugin for vim.
I modified the YCM-Generator to be able to use the target flag. https://github.com/Wurstnase/YCM-Generator/tree/develop
In the makefile I add a YCMG-flag for generating the ycm xml file.

Makefile:

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    ifeq($(YCMG), 1)
        CFLAGS += -target arm-none-eabi
    endif

and then start the generator in vim with:
YCMGeneratConfig -M=YCMG=1 -f