| RTC Drivers |
| =========== |
| |
| NuttX supports a low-level, two-part RealTime Clock (RTC) driver. |
| |
| #. An "upper half", generic driver that provides the common RTC |
| interface to application level code, and |
| #. A "lower half", platform-specific driver that implements the |
| low-level timer controls to implement the RTC functionality. |
| |
| Files supporting the RTC driver can be found in the following |
| locations: |
| |
| - **Interface Definition**. The header file for the NuttX RTC |
| driver reside at ``include/nuttx/timers/rtc.h``. This header |
| file includes both the application level interface to the RTC |
| driver as well as the interface between the "upper half" and |
| "lower half" drivers. The RTC driver uses a standard character |
| driver framework. |
| - **"Upper Half" Driver**. The generic, "upper half" RTC driver |
| resides at ``drivers/timers/rtc.c``. |
| - **"Lower Half" Drivers**. Platform-specific RTC drivers reside |
| in ``arch/``\ *<architecture>*\ ``/src/``\ *<hardware>* |
| directory for the specific processor *<architecture>* and for |
| the specific *<chip>* RTC peripheral devices. |
