ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/os/various/evtimer.c

@@ -0,0 +1,64 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    evtimer.c
+ * @brief   Events Generator Timer code.
+ *
+ * @addtogroup event_timer
+ * @{
+ */
+
+#include "ch.h"
+#include "evtimer.h"
+
+static void tmrcb(void *p) {
+  EvTimer *etp = p;
+
+  chSysLockFromIsr();
+  chEvtBroadcastI(&etp->et_es);
+  chVTSetI(&etp->et_vt, etp->et_interval, tmrcb, etp);
+  chSysUnlockFromIsr();
+}
+
+/**
+ * @brief Starts the timer
+ * @details 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 (!chVTIsArmedI(&etp->et_vt))
+    chVTSetI(&etp->et_vt, etp->et_interval, tmrcb, etp);
+
+  chSysUnlock();
+}
+
+/**
+ * @brief Stops the timer.
+ * @details 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) {
+
+  chVTReset(&etp->et_vt);
+}
+
+/** @} */