| .. _module-pw_chrono_threadx: |
| |
| ----------------- |
| pw_chrono_threadx |
| ----------------- |
| ``pw_chrono_threadx`` is a collection of ``pw_chrono`` backends that are |
| implemented using ThreadX. |
| |
| .. warning:: |
| This module is under construction, not ready for use, and the documentation |
| is incomplete. |
| |
| SystemClock backend |
| ------------------- |
| The ThreadX based ``system_clock`` backend implements the |
| ``pw_chrono:system_clock`` facade by using ``tx_time_get()``. An |
| InterruptSpinLock is used to manage overflows in a thread and interrupt safe |
| manner to produce a signed 64 bit timestamp. |
| |
| The ``SystemClock::now()`` must be used more than once per overflow of the |
| native ThreadX ``tx_time_get()`` overflow. Note that this duration may vary if |
| ``tx_time_set()`` is used. |
| |
| .. warning:: |
| Note that this is not compatible with TX_NO_TIMER as this disables |
| ``tx_time_get()``. |
| |
| Build targets |
| ------------- |
| The GN build for ``pw_chrono_threadx`` has one target: ``system_clock``. |
| The ``system_clock`` target provides the |
| ``pw_chrono_backend/system_clock_config.h`` and ``pw_chrono_threadx/config.h`` |
| headers and the backend for the ``pw_chrono:system_clock``. |
