SW4STM32C datasheet(68/99 Pages) STMICROELECTRONICS

68 / 99 page

Printf debugging

AN4989

68/99

DocID030181 Rev 2

printf()

and scanf(). It can also allow to use the screen and keyboard of the host

instead of having a screen and keyboard on the target system.

This is useful because development hardware often does not have all the input and output

facilities of the final system. Semihosting enables the host computer to provide these

facilities.

However, the user has to be aware of the following drawbacks:

•

Semihosting only works during a debug session. Otherwise, the program gets stuck in

the first printf() routine reached.

•

Since semihosting uses breakpoint instruction and host dependent code, it has

significant and unpredictable impact on performance.

Semihosting depends on the library provided by the IDE. The next sections present how to

set semihosting using the three main IDEs covered in this application note.

7.4.1

IAR™ EWARM

IAR™ EWARM provides a highly integrated semihosting feature, enabled by default.

Figure 48 shows how to check if it is the case for the project in Options -> General options

-> Library Configuration Pane.

Figure 48. Semihosting configuration in IAR™

SW4STM32C Datasheet(PDF) 68 Page - STMicroelectronics