Import Mbed OS hard-float snapshot

drivers/source/Timer.cpp

@@ -0,0 +1,152 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2019 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+#include "drivers/Timer.h"
+#include "drivers/LowPowerTimer.h"
+#include "hal/ticker_api.h"
+#include "hal/us_ticker_api.h"
+#include "hal/lp_ticker_api.h"
+#include "platform/CriticalSectionLock.h"
+#include "platform/mbed_critical.h"
+#include "platform/mbed_power_mgmt.h"
+
+using std::milli;
+using std::micro;
+using namespace std::chrono;
+
+namespace mbed {
+
+TimerBase::TimerBase(const ticker_data_t *data) : TimerBase(data, !data->interface->runs_in_deep_sleep)
+{
+}
+
+TimerBase::TimerBase(const ticker_data_t *data, bool lock_deepsleep) : _ticker_data(data), _lock_deepsleep(lock_deepsleep)
+{
+    reset();
+}
+
+// This creates a temporary CriticalSectionLock while we delegate to the
+// constructor that does the copy, thus holding critical section during the copy,
+// ensuring locking on the source. Then continue our own initialization
+// outside the critical section
+TimerBase::TimerBase(const TimerBase &t) : TimerBase(t, CriticalSectionLock{})
+{
+    // If running, new copy needs an extra lock
+    if (_running && _lock_deepsleep) {
+        sleep_manager_lock_deep_sleep();
+    }
+}
+
+// Unlike copy constructor, no need for lock on move - we must be only person
+// accessing source.
+TimerBase::TimerBase(TimerBase &&t) : TimerBase(t, false)
+{
+    // Original is marked as no longer running - we adopt any lock it had
+    t._running = false;
+}
+
+TimerBase::~TimerBase()
+{
+    if (_running) {
+        if (_lock_deepsleep) {
+            sleep_manager_unlock_deep_sleep();
+        }
+    }
+}
+
+void TimerBase::start()
+{
+    CriticalSectionLock lock;
+    if (!_running) {
+        if (_lock_deepsleep) {
+            sleep_manager_lock_deep_sleep();
+        }
+        _start = _ticker_data.now();
+        _running = true;
+    }
+}
+
+void TimerBase::stop()
+{
+    CriticalSectionLock lock;
+    _time += slicetime();
+    if (_running) {
+        if (_lock_deepsleep) {
+            sleep_manager_unlock_deep_sleep();
+        }
+    }
+    _running = false;
+}
+
+int TimerBase::read_us() const
+{
+    return duration<int, micro>(elapsed_time()).count();
+}
+
+float TimerBase::read() const
+{
+    return duration<float>(elapsed_time()).count();
+}
+
+int TimerBase::read_ms() const
+{
+    return duration_cast<duration<int, milli>>(elapsed_time()).count();
+}
+
+us_timestamp_t TimerBase::read_high_resolution_us() const
+{
+    return duration_cast<duration<us_timestamp_t, micro>>(elapsed_time()).count();
+}
+
+microseconds TimerBase::elapsed_time() const
+{
+    CriticalSectionLock lock;
+    return _time + slicetime();
+}
+
+microseconds TimerBase::slicetime() const
+{
+    CriticalSectionLock lock;
+    microseconds ret = 0us;
+    if (_running) {
+        ret = _ticker_data.now() - _start;
+    }
+    return ret;
+}
+
+void TimerBase::reset()
+{
+    CriticalSectionLock lock;
+    _start = _ticker_data.now();
+    _time = 0s;
+}
+
+TimerBase::operator float() const
+{
+    return duration<float>(elapsed_time()).count();
+}
+
+Timer::Timer() : TimerBase(get_us_ticker_data(), true)
+{
+}
+
+#if DEVICE_LPTICKER
+LowPowerTimer::LowPowerTimer() : TimerBase(get_lp_ticker_data(), false)
+{
+}
+#endif
+
+} // namespace mbed