Can't print floats

[Lars Fagerbakke]

Hello,

I'm trying to print a float using my Thingy91 and Segger EDU Mini. 

It prints my printk statements (but not the values), but printf is completely ignored. Trying to use printk just outputs the value as *float*.

Code:

    float f1 = 1.23f;

    char buffer[4];
    snprintf(buffer, sizeof(buffer), "%f", f1);

    printk("START PRINT\n");
    printk("printk: %f\n", f1);
    printk("printk2: %f\n", buffer);
    printf("printf: %f\n", f1);
    printk("END PRINT\n");

Outputs:

START PRINT
printk: *float*
printk2: *float*
END PRINT

I've found an old post that might point to a issue with the RTT, but it did not get resolved.

[Mati]

Try to add to prj.conf:

CONFIG_FPU=y


If it will not work - try to use LOG_INF and check config settings below:
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n

[Lars Fagerbakke]

Thanks Mati  Adding CONFIG_FPU=y to proj.conf did the trick!