Logging with char array

[corbin]

Environment details:

• Board: Custom
• Chip: nRF52840
• PCA Number: PCA10056
• SoftDevice: S140, v7.0.1
• nRF5 SDK: Version 16.0.0
• mdk version: 8.46.0
• nrfjprog version: 10.15.4 external
• JLinkARM.dll version: 7.64d

Issue:

I'd expect the following log lines to all result in the same thing, but only the first one works as expected, the others result in either no output or mangled output.

Do you have any suggestions? I'd like to be able to log dynamically created character arrays.

// works as expected
NRF_LOG_INFO("some string");

// viewable in debugger, doesn't print (or prints empty string)
static char s[] = "some string";
NRF_LOG_INFO(s);

// debugger displays 'Memory read failure', mangled string printed,
// switch debugger to display array and we see the correct value.
char s[] = "some string";
NRF_LOG_INFO(s);

For the 3rd case, This is what it looks like in the debugger initially:

And if I change it to be of type `array`:

[ovrebekk]

Hi

What if you do it like this instead? 

NRF_LOG_INFO("%s", s);

Then I believe the string will be copied internally, and you don't have to worry about the original memory being overwritten. 

Best regards
Torbjørn

[corbin]

This does work, thank you.