stsw-bnrg-mesh package printf means transferring the data through uart. How can we print message in IAR terminal i/o using semi hosting?

[Anitha]

Hi Sir/Madam

While opening lightning demo application with IAR, in the target option->general option

->library low level interface implementation->stdout\stderr is disabled. Why it is disabled?

How to enable the stdout\stderr option(via semihosting)? How can we print message in IAR terminal i/o using semi hosting? what are the things need to done to enable ?