Ticker.cpp

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