# Sub-directories in this lesson:
```
|
+---CMSIS           - CMSIS (Cortex Microcontroller Software Interface Standard)
|
+---ek-tm4c123gxl   - support code for EK-TM4C123GXL (TivaC Launchpad) board
|
+---nucleo-c031c6   - support code for STM32 NUCLEO-C031C6 board
|
+---stm32c031-keil
|        ...
|       lesson.uvprojx - KEIL project for STM32 NUCLEO-C031C6
|
\---tm4c123-keil
        ...
        lesson.uvprojx - KEIL project for TM4C123 (TivaC LaunchPad)
```