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    • Posted by sanketpatel2020@gmail.com on 2016-12-27 06:40

    Hi! Greetings!

    I am working with complex numbers on STM32L0 nucleo board using SW4STM32 eclipse.

    My abstract code:

    while()
    {
    ...other statements...which calculate the value of znext to be 2.76623654 + -0.352664977 * I
    volatile _Complex float znprev=zn;
    volatile _Complex float zn=znext; //I am not able to get the value of 'znext' to be transferred to 'zn'.
    }

    Meanwhile if I keep the cursor on 'zn' in run mode, I get following:

    Name : zn
    Details:2.76623654 + -0.352664977 * I
    Default:3.5 + 0 * I
    Decimal:3 + 0 * I
    Hex:0x3 + 0x0 * I
    Binary:11 + 0 * I
    Octal:03 + 0 * I

    Why the value displayed in "Default" does not get replaced by the value in "Details"?
    I also have tried using the syntax "complex volatile float" and "volatile complex float".
    Sometimes I get in the output. I tried setting different optimization levels and finally kept "Optimize for Debug (-Og)"

    Please provide your suggestions.
    Regards,
    Sanket

         Posted by Vetch on 2017-01-02 16:58

    Hi Sanket! Greetings!
    Please, note that this forum is mainly used for Eclipse/SW4STM32 related discussions.
    You may get more comments in using forum dedicated to C coding.

    Anyway, I made trials but didn't manage to reproduce this issue.
    In my test code, I included complex.h : the Standard Library of Complex Numbers
    The variables are declared with the following line :
    volatile float complex z0, z1, z, zprev, znext; // imaginary 32-bit number

    In the attached snapshot, you can see :
    - the code of the main function;
    - both parts of the complex variables updated;

    I hope it can help.

    Complex_Floats.png (163.39 Kb)