Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

RE: Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

masterLee — Fri, 26 Jul 2019 15:04:41 GMT

I would suggest to take a fresh example from the SDK. You may have changed something in your code and you can to remember it. Next do the following

1) Modify the printf/scanf options as mentioned before

2) Create a character array (i.e. char my_array[50] = {'\0'} ) and a float variable(i.e. x=3.14).

2) use sprintf since it is the most straight forward choice (in my opinion)

  sprintf(str, "Value of Pi = %f", x);

3)Open the CMSIS Configuration wizard. Under nrf_log enable NRF_LOG_ENABLED and BACKEND_RTT

4) Write something on the segger serial port. Also enable RTT J-link view

RE: Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

awneil — Fri, 26 Jul 2019 13:39:12 GMT

[quote userid="74601" url="~/f/nordic-q-a/38703/cannot-print-more-than-two-values-in-a-single-command-line-using-nrf_log_float_marker/176578"] I checked Jørgen's solution and it works fine Here is an example[/quote]

Actually, that is not an example of what Jørgen Holmefjord said at all!

The whole point of the NRF_LOG_FLOAT_MARKER is that it lets you print floats without using %f - and the extra library code which that requires.

[quote userid="78088" url="~/f/nordic-q-a/38703/cannot-print-more-than-two-values-in-a-single-command-line-using-nrf_log_float_marker/200711"]Thanks for the solution[/quote]

Unfortunately, it was wrong!

[quote userid="78088" url="~/f/nordic-q-a/38703/cannot-print-more-than-two-values-in-a-single-command-line-using-nrf_log_float_marker/200711"] "%f" does not work[/quote]

Indeed - as masterLee says, you need additional library support to use %f.

RE: Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

masterLee — Fri, 26 Jul 2019 12:40:50 GMT

This sounds to me like you have not enabled the float option in the project printf/scanf options.

RE: Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

GT — Fri, 26 Jul 2019 09:55:20 GMT

Thanks for the solution. Unfortunately "%f" does not work. Nothing gets updated on the array pointer. Do you know what needs to be done to enable %f output? Though NRF_LOG_FLOAT_MARKER works but that doesn't use %f.

RE: Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

masterLee — Sun, 17 Mar 2019 20:07:14 GMT

Hi, I checked Jørgen's solution and it works fine Here is an example

          
main(){
    char array[100] = {0};
    ...
    ... // whatever your code is
    ...
    sprintf(array,"%.2f %.2f %.2f %.2f", floatVal_A, floatVal_B, floatVal_C, floatVal_D);
    NRF_LOG_INFO( " Float Values are: %s", array);
}

Regards

RE: Cannot print more than two values in a single command line using NRF_LOG_FLOAT_MARKER

Jørgen Holmefjord — Thu, 20 Sep 2018 08:37:55 GMT

Hi,

Unfortunately, nRF Logger is only implemented for 0 to 6 arguments. NRF_LOG_FLOAT_MARKER use 3 arguments to print one float ("%s%d.%02d"). You can use sprintf to print more floats to a string, and pass this string to NRF_LOG afterwards.

Best regards,
Jørgen