From d6d799ed48f8193bee286187132221f831726a07 Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Sat, 6 Oct 2007 08:58:52 +0000
Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@39
 35acf78f-673a-0410-8e92-d51de3d6d3f4

---
 src/lib/evtimer.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/lib/evtimer.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+)
 create mode 100644 src/lib/evtimer.c
 create mode 100644 src/lib/evtimer.h

(limited to 'src/lib')

diff --git a/src/lib/evtimer.c b/src/lib/evtimer.c
new file mode 100644
index 000000000..212c8f124
--- /dev/null
+++ b/src/lib/evtimer.c
@@ -0,0 +1,68 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 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 evtimer.c
+ * @{
+ * Event Timer, this timer generates an event at regular intervals. The
+ * listening threads can use the event to perform time related activities.
+ * Multiple threads can listen to the same timer.
+ */
+
+#include <ch.h>
+
+#include "evtimer.h"
+
+static void tmrcb(void *p) {
+  EvTimer *etp = p;
+
+  chVTSetI(&etp->et_vt, etp->et_interval, tmrcb, etp);
+}
+
+/**
+ * Starts the timer, if the timer was already running then the function has
+ * no effect.
+ * @param etp pointer to an initialized \p EvTimer structure.
+ */
+void evtStart(EvTimer *etp) {
+
+  chSysLock();
+
+  if (!etp->et_vt.vt_func)
+    chVTSetI(&etp->et_vt, etp->et_interval, tmrcb, etp);
+
+  chSysUnlock();
+}
+
+/**
+ * Stops the timer, if the timer was already stopped then the function has
+ * no effect.
+ * @param etp pointer to an initialized \p EvTimer structure.
+ */
+void evtStop(EvTimer *etp) {
+
+  chSysLock();
+
+  if (etp->et_vt.vt_func)
+    chVTResetI(&etp->et_vt);
+
+  chSysUnlock();
+}
+
+/** @} */
diff --git a/src/lib/evtimer.h b/src/lib/evtimer.h
new file mode 100644
index 000000000..43b0374ee
--- /dev/null
+++ b/src/lib/evtimer.h
@@ -0,0 +1,65 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 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 evtimer.h
+ * @{
+ * Event Timer definitions.
+ * @see evtimer.c
+ */
+
+#ifndef _EVTIMER_H_
+#define _EVTIMER_H_
+
+
+typedef struct {
+  VirtualTimer  et_vt;
+  EventSource   et_es;
+  t_time        et_interval;
+} EvTimer;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void evtStart(EvTimer *etp);
+  void evtStop(EvTimer *etp);
+#ifdef __cplusplus
+}
+#endif
+
+/**
+ * Initializes an \p EvTimer structure.
+ */
+#define evtInit(et, i) (chEvtInit(&(etp)->et_es), \
+                       (etp)->et_vt.vt_func = NULL, \
+                       (etp)->et_interval = (i))
+
+/**
+ * Registers the invoking thread as listener on the timer event.
+ */
+#define evtRegister(etp, el, eid) chEvtRegister(&(etp)->et_es, el, eid)
+
+/**
+ * Unregisters the invoking thread as listener on the timer event.
+ */
+#define evtUnregister(etp, el) chEvtUnregister(&(etp)->et_es, el)
+
+#endif /* _EVTIMER_H_ */
+
+/** @} */
-- 
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