Ticker.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 #include "drivers/Ticker.h"
00018 
00019 #include "drivers/TimerEvent.h"
00020 #include "platform/FunctionPointer.h"
00021 #include "hal/ticker_api.h"
00022 #include "platform/mbed_critical.h"
00023 
00024 namespace mbed {
00025 
00026 void Ticker::detach()
00027 {
00028     core_util_critical_section_enter();
00029     remove();
00030     // unlocked only if we were attached (we locked it) and this is not low power ticker
00031     if (_function && _lock_deepsleep) {
00032         sleep_manager_unlock_deep_sleep();
00033     }
00034 
00035     _function = 0;
00036     core_util_critical_section_exit();
00037 }
00038 
00039 void Ticker::setup(us_timestamp_t t)
00040 {
00041     core_util_critical_section_enter();
00042     remove();
00043     _delay = t;
00044     insert_absolute(_delay + ticker_read_us(_ticker_data));
00045     core_util_critical_section_exit();
00046 }
00047 
00048 void Ticker::handler()
00049 {
00050     insert_absolute(event.timestamp + _delay);
00051     if (_function) {
00052         _function();
00053     }
00054 }
00055 
00056 void Ticker::attach_us(Callback<void()> func, us_timestamp_t t)
00057 {
00058     core_util_critical_section_enter();
00059     // lock only for the initial callback setup and this is not low power ticker
00060     if (!_function && _lock_deepsleep) {
00061         sleep_manager_lock_deep_sleep();
00062     }
00063     _function = func;
00064     setup(t);
00065     core_util_critical_section_exit();
00066 }
00067 
00068 } // namespace mbed