Adding definitions to Keil UVision4 toolchains

To add a new definition to a Keil project, open the project's option dialog by right-clicking on the project title in the Project browser and selecting Options.

In the settings dialog, select the C/C++ tab. In the Define section of the dialog, type in unvalued definitions separated by a space. Definitions that have a value should have the value assigned with an '=' statement after the definition.