Hi,

I’m seeing an issue whereby I am unable to log strings using LOG_DBG() and %s format, for a quick example I modified the hello world sample to enable logging and change the code to this:

#define LOG_DOMAIN test_domain

#include <logging/log.h>

LOG_MODULE_REGISTER(LOG_DOMAIN);

 

void main(void)

{

                char baTmpBuf[12];

                sprintf(baTmpBuf, "ffffffff");

                LOG_DBG("Test : %s", baTmpBuf);

 

                printk("Hello World! %s\n", CONFIG_BOARD);

}

I expect to see “Test : ffffffff” but instead I am getting “Test : %*”, if I change the code to inefficiently log each character, e.g.:

                LOG_DBG("Test : %c%c%c%c%c%c%c%c", baTmpBuf[0], baTmpBuf[1], baTmpBuf[2], baTmpBuf[3], baTmpBuf[4], baTmpBuf[5], baTmpBuf[6], baTmpBuf[7]);

Then I get the expected output: “Test : ffffffff”

 

So why is %s not outputting a string? If there a configuration option I have missed? I have tried toggling “Format strings with libc” option but it doesn’t change anything. I’m testing on an nRF52840 using the nrf52840_pca10056 board file.

Thanks,
Jamie

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