Runtime library configuration

The Library Configuration tab provides an interface for configuring the runtime library options such as locale support, multibytes in printf(), low-level interface implementation for stdout/stderr, etc.

• Open the project’s options with Project → Options (ALT+F7).
• Navigate to the General Options category → Library Configuration tab.
• Select a library type according to the requirement.

IAR Embedded Workbench for Arm

Specifically for Arm targets,

• Select Semihosted for Library low-level interface implementation.
• If the device has the SWO pin, set stdout/stderr type to Via SWO. This will redirect the low-level output (from printf(), for example) to the Terminal I/O window.

Note

The default option is stdout/stderr: Via semihosting. Only devices with the SWO pin can use SWO to redirect output messages to the Terminal I/O window.

• Check the Use CMSIS option to enable CMSIS support.

Note

CMSIS is a standard firmware library infrastructure has been created by Arm Ltd. along with semiconductor and toolchain vendors. The Cortex® Microcontroller Software Interface Standard (CMSIS) defines a hardware abstraction layer which is available as a firmware library integrated into the IAR Embedded Workbench for Arm.