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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2012-01-09 18:28:29 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2012-01-09 18:28:29 +0000 |
| commit | 7041c5b167918def8ad906cbd9a46d73acc73c56 (patch) | |
| tree | 3ce109d0f20448364fbb908fcbe6ed413c3454e6 /os/hal/src/tm.c | |
| parent | da38ec03db0391378811e0214bf039feea6d79f3 (diff) | |
| download | ChibiOS-7041c5b167918def8ad906cbd9a46d73acc73c56.tar.gz ChibiOS-7041c5b167918def8ad906cbd9a46d73acc73c56.tar.bz2 ChibiOS-7041c5b167918def8ad906cbd9a46d73acc73c56.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3775 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/src/tm.c')
| -rw-r--r-- | os/hal/src/tm.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/os/hal/src/tm.c b/os/hal/src/tm.c new file mode 100644 index 000000000..4d1eb57b8 --- /dev/null +++ b/os/hal/src/tm.c @@ -0,0 +1,105 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file tm.c
+ * @brief Time Measurement unit code.
+ *
+ * @addtogroup TM
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if HAL_USE_TM
+
+/**
+ * @brief Subsystem calibration value.
+ */
+static halrtcnt_t measurement_offset;
+
+
+/**
+ * @brief Starts a measurement.
+ *
+ * @param[in,out] tmp pointer to a @p TimeMeasurement structure
+ *
+ * @notapi
+ */
+static void tm_start(TimeMeasurement *tmp) {
+
+ tmp->last = halGetCounterValue();
+}
+
+/**
+ * @brief Stops a measurement.
+ *
+ * @param[in,out] tmp pointer to a @p TimeMeasurement structure
+ *
+ * @notapi
+ */
+static void tm_stop(TimeMeasurement *tmp) {
+
+ halrtcnt_t now = halGetCounterValue();
+ tmp->last = now - tmp->last - measurement_offset;
+ if (tmp->last > tmp->worst)
+ tmp->worst = tmp->last;
+ else if (tmp->last < tmp->best)
+ tmp->best = tmp->last;
+}
+
+/**
+ * @brief Initializes the Time Measurement unit.
+ *
+ * @init
+ */
+void tmInit(void) {
+ TimeMeasurement tm;
+
+ /* Time Measurement subsystem calibration, it does a null measurement
+ and calculates the call overhead which is subtracted to real
+ measurements.*/
+ measurement_offset = 0;
+ tmObjectInit(&tm);
+ tmStartMeasurement(&tm);
+ tmStopMeasurement(&tm);
+ measurement_offset = tm.last;
+}
+
+/**
+ * @brief Initializes a @p TimeMeasurement object.
+ *
+ * @param[out] tmp pointer to a @p TimeMeasurement structure
+ *
+ * @init
+ */
+void tmObjectInit(TimeMeasurement *tmp) {
+
+ tmp->start = tm_start;
+ tmp->stop = tm_stop;
+ tmp->last = (halrtcnt_t)0;
+ tmp->worst = (halrtcnt_t)0;
+ tmp->best = (halrtcnt_t)-1;
+}
+
+#endif /* HAL_USE_TM */
+
+/** @} */
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