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| author | Joel Bodenmann <joel@unormal.org> | 2012-12-18 23:15:47 +0100 |
|---|---|---|
| committer | Joel Bodenmann <joel@unormal.org> | 2012-12-18 23:15:47 +0100 |
| commit | a520a32209cc6057b985bde5d0ad21a8f4186bf2 (patch) | |
| tree | ea0aad71d6370c9ef1840607ed69680dd7f6a159 /include/gtimer | |
| parent | a75653f7a1dbe7fc8317fcc3d8d2331855d3a036 (diff) | |
| download | uGFX-a520a32209cc6057b985bde5d0ad21a8f4186bf2.tar.gz uGFX-a520a32209cc6057b985bde5d0ad21a8f4186bf2.tar.bz2 uGFX-a520a32209cc6057b985bde5d0ad21a8f4186bf2.zip | |
more doxygen
Diffstat (limited to 'include/gtimer')
| -rw-r--r-- | include/gtimer/gtimer.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/gtimer/gtimer.h b/include/gtimer/gtimer.h index 623120dc..b286d84e 100644 --- a/include/gtimer/gtimer.h +++ b/include/gtimer/gtimer.h @@ -22,6 +22,18 @@ * @brief GTIMER GFX User Timer subsystem header file.
*
* @addtogroup GTIMER
+ *
+ * @details The reason why ChibiOS/GFX has it's own timer abstraction is because
+ * virtual timers provided by ChibiOS/RT are interrupt context only.
+ * While great for what they are designed for, they make coding of the input
+ * drivers much more complex.
+ * For non-performance critical drivers like these input drivers, it would also
+ * hog an in-ordinate amount of critical (interrupt locked) system time.
+ * This contrary to the goals of a real-time operating system. So a user-land
+ * (thread based) timer mechanism is also required.
+ *
+ * @pre GFX_USE_GTIMER must be set to TRUE in your gfxconf.h
+ *
* @{
*/
#ifndef _GTIMER_H
|