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     core_util_critical_section_enter();
00027     remove();
00028     // unlocked only if we were attached (we locked it) and this is not low power ticker
00029     if(_function && _lock_deepsleep) {
00030         sleep_manager_unlock_deep_sleep();
00031     }
00032 
00033     _function = 0;
00034     core_util_critical_section_exit();
00035 }
00036 
00037 void Ticker::setup(us_timestamp_t t) {
00038     core_util_critical_section_enter();
00039     remove();
00040     _delay = t;
00041     insert_absolute(_delay + ticker_read_us(_ticker_data));
00042     core_util_critical_section_exit();
00043 }
00044 
00045 void Ticker::handler() {
00046     insert_absolute(event.timestamp + _delay);
00047     if (_function) {
00048         _function();
00049     }
00050 }
00051 
00052 } // namespace mbed