mirror of https://github.com/ARMmbed/mbed-os.git
124 lines
3.0 KiB
C++
124 lines
3.0 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2017 ARM Limited
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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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#include "ExhaustibleBlockDevice.h"
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#include "mbed.h"
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ExhaustibleBlockDevice::ExhaustibleBlockDevice(BlockDevice *bd, uint32_t erase_cycles)
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: _bd(bd), _erase_array(NULL), _erase_cycles(erase_cycles)
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{
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}
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ExhaustibleBlockDevice::~ExhaustibleBlockDevice()
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{
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delete[] _erase_array;
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}
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int ExhaustibleBlockDevice::init()
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{
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int err = _bd->init();
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if (err) {
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return err;
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}
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if (!_erase_array) {
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// can only be allocated after initialization
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_erase_array = new uint32_t[_bd->size() / _bd->get_erase_size()];
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for (size_t i = 0; i < _bd->size() / _bd->get_erase_size(); i++) {
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_erase_array[i] = _erase_cycles;
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}
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}
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return 0;
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}
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int ExhaustibleBlockDevice::deinit()
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{
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// _erase_array is lazily cleaned up in destructor to allow
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// data to live across de/reinitialization
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return _bd->deinit();
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}
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int ExhaustibleBlockDevice::sync()
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{
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return _bd->sync();
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}
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int ExhaustibleBlockDevice::read(void *buffer, bd_addr_t addr, bd_size_t size)
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{
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return _bd->read(buffer, addr, size);
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}
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int ExhaustibleBlockDevice::program(const void *buffer, bd_addr_t addr, bd_size_t size)
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{
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MBED_ASSERT(is_valid_program(addr, size));
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if (_erase_array[addr / get_erase_size()] == 0) {
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// TODO possibly something more destructive here
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return 0;
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}
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return _bd->program(buffer, addr, size);
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}
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int ExhaustibleBlockDevice::erase(bd_addr_t addr, bd_size_t size)
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{
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MBED_ASSERT(is_valid_erase(addr, size));
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// use an erase cycle
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if (_erase_array[addr / get_erase_size()] > 0) {
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_erase_array[addr / get_erase_size()] -= 1;
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}
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if (_erase_array[addr / get_erase_size()] == 0) {
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// TODO possibly something more destructive here
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return 0;
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}
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return _bd->erase(addr, size);
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}
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bd_size_t ExhaustibleBlockDevice::get_read_size() const
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{
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return _bd->get_read_size();
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}
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bd_size_t ExhaustibleBlockDevice::get_program_size() const
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{
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return _bd->get_program_size();
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}
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bd_size_t ExhaustibleBlockDevice::get_erase_size() const
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{
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return _bd->get_erase_size();
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}
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bd_size_t ExhaustibleBlockDevice::get_erase_size(bd_addr_t addr) const
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{
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return _bd->get_erase_size(addr);
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}
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int ExhaustibleBlockDevice::get_erase_value() const
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{
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return _bd->get_erase_value();
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}
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bd_size_t ExhaustibleBlockDevice::size() const
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{
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return _bd->size();
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}
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