Device interface library for multiple platforms including Mbed.
Dependents: DeepCover Embedded Security in IoT MaximInterface MAXREFDES155#
Maxim Interface is a library framework focused on providing flexible and expressive hardware interfaces. Both communication interfaces such as I2C and 1-Wire and device interfaces such as DS18B20 are supported. Modern C++ concepts are used extensively while keeping compatibility with C++98/C++03 and requiring no external dependencies. The embedded-friendly design does not depend on exceptions or RTTI.
The full version of the project is hosted on GitLab: https://gitlab.com/iabenz/MaximInterface
Diff: MaximInterfaceDevices/DS2431.cpp
- Revision:
- 7:9cd16581b578
- Child:
- 8:5ea891c7d1a1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MaximInterfaceDevices/DS2431.cpp Mon Jul 22 11:44:07 2019 -0500 @@ -0,0 +1,178 @@ +/******************************************************************************* +* Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved. +* +* Permission is hereby granted, free of charge, to any person obtaining a +* copy of this software and associated documentation files (the "Software"), +* to deal in the Software without restriction, including without limitation +* the rights to use, copy, modify, merge, publish, distribute, sublicense, +* and/or sell copies of the Software, and to permit persons to whom the +* Software is furnished to do so, subject to the following conditions: +* +* The above copyright notice and this permission notice shall be included +* in all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES +* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +* OTHER DEALINGS IN THE SOFTWARE. +* +* Except as contained in this notice, the name of Maxim Integrated +* Products, Inc. shall not be used except as stated in the Maxim Integrated +* Products, Inc. Branding Policy. +* +* The mere transfer of this software does not imply any licenses +* of trade secrets, proprietary technology, copyrights, patents, +* trademarks, maskwork rights, or any other form of intellectual +* property whatsoever. Maxim Integrated Products, Inc. retains all +* ownership rights. +*******************************************************************************/ + +#include <algorithm> +#include <MaximInterfaceCore/Error.hpp> +#include <MaximInterfaceCore/OneWireMaster.hpp> +#include "DS2431.hpp" + +namespace MaximInterfaceDevices { + +using namespace Core; + +error_code writeMemory(DS2431 & device, DS2431::Address targetAddress, + DS2431::Scratchpad::const_span data) { + error_code result = device.writeScratchpad(targetAddress, data); + if (result) { + return result; + } + DS2431::Scratchpad::array readData; + uint_least8_t esByte; + result = device.readScratchpad(readData, esByte); + if (result) { + return result; + } + result = device.copyScratchpad(targetAddress, esByte); + return result; +} + +error_code DS2431::readMemory(Address beginAddress, + span<uint_least8_t> data) const { + error_code result = selectRom(*master); + if (result) { + return result; + } + const uint_least8_t sendBlock[] = {0xF0, beginAddress, 0x00}; + result = master->writeBlock(sendBlock); + if (result) { + return result; + } + result = master->readBlock(data); + return result; +} + +error_code DS2431::writeScratchpad(Address targetAddress, + Scratchpad::const_span data) { + error_code result = selectRom(*master); + if (result) { + return result; + } + uint_least8_t block[3 + Scratchpad::size] = {0x0F, targetAddress, 0x00}; + std::copy(data.begin(), data.end(), block + 3); + result = master->writeBlock(block); + if (result) { + return result; + } + const uint_fast16_t calculatedCrc = calculateCrc16(block) ^ 0xFFFFu; + result = master->readBlock(make_span(block, 2)); + if (result) { + return result; + } + if (calculatedCrc != + ((static_cast<uint_fast16_t>(block[1]) << 8) | block[0])) { + result = make_error_code(CrcError); + } + return result; +} + +error_code DS2431::readScratchpad(Scratchpad::span data, + uint_least8_t & esByte) { + typedef array<uint_least8_t, 6 + Scratchpad::size> Block; + + error_code result = selectRom(*master); + if (result) { + return result; + } + Block block = {0xAA}; + result = master->writeByte(block.front()); + if (result) { + return result; + } + result = master->readBlock(make_span(block).subspan(1)); + if (result) { + return result; + } + Block::const_iterator blockIt = block.end(); + uint_fast16_t receivedCrc = static_cast<uint_fast16_t>(*(--blockIt)) << 8; + receivedCrc |= *(--blockIt); + const uint_fast16_t expectedCrc = + calculateCrc16(make_span(block.data(), block.size() - 2)) ^ 0xFFFFu; + if (expectedCrc == receivedCrc) { + Block::const_iterator blockItEnd = blockIt; + blockIt -= data.size(); + std::copy(blockIt, blockItEnd, data.begin()); + esByte = *(--blockIt); + } else { + result = make_error_code(CrcError); + } + return result; +} + +error_code DS2431::copyScratchpad(Address targetAddress, uint_least8_t esByte) { + error_code result = selectRom(*master); + if (result) { + return result; + } + uint_least8_t block[] = {0x55, targetAddress, 0x00}; + result = master->writeBlock(block); + if (result) { + return result; + } + result = master->writeByteSetLevel(esByte, OneWireMaster::StrongLevel); + if (result) { + return result; + } + sleep->invoke(10); + result = master->setLevel(OneWireMaster::NormalLevel); + if (result) { + return result; + } + result = master->readByte(block[0]); + if (result) { + return result; + } + if (block[0] != 0xAA) { + result = make_error_code(OperationFailure); + } + return result; +} + +const error_category & DS2431::errorCategory() { + static class : public error_category { + public: + virtual const char * name() const { return "DS2431"; } + + virtual std::string message(int condition) const { + switch (condition) { + case CrcError: + return "CRC Error"; + + case OperationFailure: + return "Operation Failure"; + } + return defaultErrorMessage(condition); + } + } instance; + return instance; +} + +} // namespace MaximInterfaceDevices