mirror of https://github.com/ARMmbed/mbed-os.git
117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
/*
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* Copyright (c) 2019 Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef DEVICE_VIRTUAL_WATCHDOG
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#include "VirtualWatchdog.h"
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#include "Watchdog.h"
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namespace mbed {
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VirtualWatchdog *VirtualWatchdog::_first = NULL;
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VirtualWatchdog::VirtualWatchdog(uint32_t timeout, const char *const str): _name(str)
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{
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_current_count = 0;
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_is_initialized = false;
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_next = NULL;
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_max_timeout = timeout;
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// start watchdog
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Watchdog& watchdog = Watchdog::get_instance();
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watchdog.start();
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}
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VirtualWatchdog::~VirtualWatchdog()
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{
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if (_is_initialized) {
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stop();
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// we do not need to stop hw watchdog, it's ticking by itself
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}
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}
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void VirtualWatchdog::start()
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{
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MBED_ASSERT(!_is_initialized);
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core_util_critical_section_enter();
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add_to_list();
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core_util_critical_section_exit();
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}
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void VirtualWatchdog::kick()
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{
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MBED_ASSERT(_is_initialized);
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core_util_critical_section_enter();
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_current_count = 0;
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core_util_critical_section_exit();
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}
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void VirtualWatchdog::stop()
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{
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MBED_ASSERT(_is_initialized);
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core_util_critical_section_enter();
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remove_from_list();
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core_util_critical_section_exit();
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}
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void VirtualWatchdog::add_to_list()
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{
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this->_next = _first;
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_first = this;
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_is_initialized = true;
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}
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void VirtualWatchdog::remove_from_list()
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{
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VirtualWatchdog *cur_ptr = _first,
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*prev_ptr = NULL;
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while (cur_ptr != NULL) {
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if (cur_ptr == this) {
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if (cur_ptr == _first) {
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prev_ptr = _first;
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_first = cur_ptr->_next;
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prev_ptr->_next = NULL;
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} else {
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prev_ptr->_next = cur_ptr->_next;
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cur_ptr->_next = NULL;
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}
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_is_initialized = false;
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break;
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} else {
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prev_ptr = cur_ptr;
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cur_ptr = cur_ptr->_next;
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}
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}
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}
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void VirtualWatchdog::process(uint32_t elapsed_ms)
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{
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VirtualWatchdog *cur_ptr = _first;
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while (cur_ptr != NULL) {
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if (cur_ptr->_current_count > cur_ptr->_max_timeout) {
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system_reset();
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} else {
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cur_ptr->_current_count += elapsed_ms;
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}
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cur_ptr = cur_ptr->_next;
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}
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}
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} // namespace mbed
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#endif // DEVICE_VIRTUAL_WATCHDOG
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