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    • sprinf conversion of float is not working for STM32F7

    Posted by sync1 on 2016-06-19 13:47

    Hi Tarek,

    I treid adding "-u _printf_float" to enable float printf. as you suggest but after build i get the following errors?


    Building target: EM34.elf
    Invoking: MCU GCC Linker
    arm-none-eabi-gcc -mcpu=cortex-m3 -mthumb -mfloat-abi=soft -specs=nosys.specs -specs=nano.specs -Xlinker -u _printf_float -T"../STM32F103CBTx_FLASH.ld" -Wl,-Map=output.map -Wl,--gc-sections -lm -o "EM34.elf" @"objects.list"
    arm-none-eabi-gcc.exe: error: _printf_float: No such file or directory
    make: *** EM34.elf Error 1

    I am using latest updates for STM32 CubeMX, and STM32 Workbench..... I recall this solution used to work on previuos version but not now?
    Any suggestions?

    Reads: 4006
    Posted by tang on 2016-06-20 11:13

    Hi,

    I think you put the "-u _printf_float" on the wrong place, it should be in the linker flags and not the -Xlinker area.

    Regards
    Kevin.

         Posted by sync1 on 2016-06-20 12:19

    Hi Tang,

    I am sure I put the options under the Linker Flags, as I said this option was working under previous versions (unsure which version it was) but I recently clicked "update" on both the STM32 CubeMX and the System32 Workbench programs and now for some unlknown reason The Linker throws the following errors:

    Building target: EM34.elf
    Invoking: MCU GCC Linker
    arm-none-eabi-gcc -mcpu=cortex-m3 -mthumb -mfloat-abi=soft -specs=nosys.specs -specs=nano.specs -Xlinker -u _sprintf_float -Xlinker -u _printf_float -T"../STM32F103CBTx_FLASH.ld" -Wl,-Map=output.map -Wl,--gc-sections -lm -o "EM34.elf" @"objects.list"
    arm-none-eabi-gcc.exe: error: _sprintf_float: No such file or directory
    arm-none-eabi-gcc.exe: error: _printf_float: No such file or directory
    make: *** EM34.elf Error 1

    (see attached image)

    LinkerSettings.png (42.06 Kb)