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Zephyr project on STM32

   Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
  • Install host dependencies.
  • Import toolchain and SDK.
  • Create, configure, build and manage apps.
  • Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench

System Workbench for STM32

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snprintf() Outputs Empty String

Posted by spflanze on 2016-04-11 05:42

The code: 

char *pstrResp;
pstrResp = pvPortMalloc( 23 );
snprintf( pstrResp, 23, "%8.6g", .0123 );

Produces an empty string in pstrResp. In it there is only the NULL terminator in the first character position. I expected .0123 to be converted to characters and placed in pstrRes. What is wrong here?

The pstrResp points to a RAM location so it is known that pvPortMalloc() succeded.
If I include a string using %s specifier the string does show up in pstrResp.

Processor is STM32F373VCT
This is an STM32CubeMX generated project with the FREERTOS option enabled.
The compiler is GNU.

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Posted by tarek bouchkati on 2016-04-11 11:12 Tunisia

check if you are using nanolib (-specs=nano.specs in Project properties > C/C++ Build > Settings > Tool Settings (TAB) > MCU GCC Linker > Miscellaneous > Linker flags)
If it is the case, you need to enable float printf :
-specs=nano.specs -u _printf_float

Regards,
Tarek

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