HAL_ChibiOS: add EventSource HAL

libraries/AP_HAL_ChibiOS/EventSource.cpp

@@ -0,0 +1,34 @@
+#include "EventSource.h"
+#include <AP_HAL/AP_HAL.h>
+
+using namespace ChibiOS;
+
+#if CH_CFG_USE_EVENTS == TRUE
+
+bool EventSource::wait(uint64_t duration, AP_HAL::EventHandle *evt_handle)
+{
+    chibios_rt::EventListener evt_listener;
+    eventmask_t evt_mask = evt_handle->get_evt_mask();
+    msg_t ret = msg_t();
+    ch_evt_src_.registerMask(&evt_listener, evt_mask);
+    if (duration == 0) {
+        ret = chEvtWaitAnyTimeout(evt_mask, TIME_IMMEDIATE);
+    } else {
+        ret = chEvtWaitAnyTimeout(evt_mask, chTimeUS2I(duration));
+    }
+    ch_evt_src_.unregister(&evt_listener);
+    return ret == MSG_OK;
+}
+
+void EventSource::signal(uint32_t evt_mask)
+{
+    ch_evt_src_.broadcastFlags(evt_mask);
+}
+
+void EventSource::signalI(uint32_t evt_mask)
+{
+    chSysLockFromISR();
+    ch_evt_src_.broadcastFlagsI(evt_mask);
+    chSysUnlockFromISR();
+}
+#endif