# Sub-directories in this lesson:
```
|
+---CMSIS           - CMSIS (Cortex Microcontroller Software Interface Standard)
|
+---ek-tm4c123gxl   - support code for EK-TM4C123GXL (TivaC Launchpad) board 
|
\---tm4c123-ccs-gnu
        ...
        .project     - CCS project for TM4C123 (TivaC LaunchPad)
```