Diff: drivers/Timer.cpp

Revision:

0:b74591d5ab33

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/Timer.cpp	Mon Dec 11 17:54:04 2017 +0000
@@ -0,0 +1,110 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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 "hal/ticker_api.h"
+#include "hal/us_ticker_api.h"
+#include "platform/mbed_critical.h"
+#include "hal/lp_ticker_api.h"
+
+namespace mbed {
+
+Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()), _lock_deepsleep(true) {
+    reset();
+}
+
+Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data), _lock_deepsleep(true) {
+    reset();
+#if DEVICE_LOWPOWERTIMER
+    _lock_deepsleep = (data != get_lp_ticker_data());
+#endif
+}
+
+Timer::~Timer() {
+    core_util_critical_section_enter();
+    if (_running) {
+        if(_lock_deepsleep) {
+            sleep_manager_unlock_deep_sleep();
+        }
+    }
+    _running = 0;
+    core_util_critical_section_exit();
+}
+
+void Timer::start() {
+    core_util_critical_section_enter();
+    if (!_running) {
+        if(_lock_deepsleep) {
+            sleep_manager_lock_deep_sleep();
+        }
+        _start = ticker_read_us(_ticker_data);
+        _running = 1;
+    }
+    core_util_critical_section_exit();
+}
+
+void Timer::stop() {
+    core_util_critical_section_enter();
+    _time += slicetime();
+    if (_running) {
+        if(_lock_deepsleep) {
+            sleep_manager_unlock_deep_sleep();
+        }
+    }
+    _running = 0;
+    core_util_critical_section_exit();
+}
+
+int Timer::read_us() {
+    return read_high_resolution_us();
+}
+
+float Timer::read() {
+    return (float)read_us() / 1000000.0f;
+}
+
+int Timer::read_ms() {
+    return read_high_resolution_us() / 1000;
+}
+
+us_timestamp_t Timer::read_high_resolution_us() {
+    core_util_critical_section_enter();
+    us_timestamp_t time = _time + slicetime();
+    core_util_critical_section_exit();
+    return time;
+}
+
+us_timestamp_t Timer::slicetime() {
+    us_timestamp_t ret = 0;
+    core_util_critical_section_enter();
+    if (_running) {
+        ret = ticker_read_us(_ticker_data) - _start;
+    }
+    core_util_critical_section_exit();
+    return ret;
+}
+
+void Timer::reset() {
+    core_util_critical_section_enter();
+    _start = ticker_read_us(_ticker_data);
+    _time = 0;
+    core_util_critical_section_exit();
+}
+
+Timer::operator float() {
+    return read();
+}
+
+} // namespace mbed