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nrf logging api

user115812

hi, 

sdk 17.1.0

Can I call "NRF_LOG_INFO" API back to back ? Does it copy the contents of the buffer (var) to an internal buffer ?

For example, in the below code, does the second call "NRF_LOG_INFO" corrupt the buffer 'var' ?

uint8_t var[31];

//fill var[]

NRF_LOG_INFO("%s", var);

//changing var[] array

NRF_LOG_INFO("%s", var);

  • +1

    Hi,

    If you do not use deferred logging, then this would be OK as logging happens immediately. With deferred logging this will not be OK though, as data is not copied to a dedicated buffer by default. So for volatile data like stack variables or variables that are overwritten (both is the case here), no should explicitly use NRF_LOG_PUSH to copy the string to an internal logger buffer. For instance like this:

    NRF_LOG_INFO("Message: \"%s\"", NRF_LOG_PUSH(my_volatile_string));

  • 0 in reply to user7377

    Hi Einar,

    Thank you for your reply.

    I am calling "NRF_LOG_INFO" from an ISR, and hence my Deferred logging is enabled as given below. 

    #define NRF_LOG_DEFERRED 1

    So, I think I should keep extra buffer in my application.

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