Diff: Devices/DS2431.cpp

Revision:

0:f77ad7f72d04

Child:

6:a8c83a2e6fa4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Devices/DS2431.cpp	Mon Nov 06 14:39:18 2017 -0600
@@ -0,0 +1,187 @@
+/*******************************************************************************
+* 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 <MaximInterface/Links/OneWireMaster.hpp>
+#include <MaximInterface/Utilities/Error.hpp>
+#include "DS2431.hpp"
+
+namespace MaximInterface {
+
+enum Command {
+  WriteScratchpad = 0x0F,
+  ReadScratchpad = 0xAA,
+  CopyScratchpad = 0x55,
+  ReadMemory = 0xF0
+};
+
+error_code writeMemory(DS2431 & device, DS2431::Address targetAddress,
+                       const DS2431::Scratchpad & data) {
+  error_code result = device.writeScratchpad(targetAddress, data);
+  if (result) {
+    return result;
+  }
+  DS2431::Scratchpad 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, uint_least8_t * data,
+                              size_t dataLen) const {
+  error_code owmResult = selectRom(*master);
+  if (owmResult) {
+    return owmResult;
+  }
+  const uint_least8_t sendBlock[] = {ReadMemory, beginAddress, 0x00};
+  owmResult =
+      master->writeBlock(sendBlock, sizeof(sendBlock) / sizeof(sendBlock[0]));
+  if (owmResult) {
+    return owmResult;
+  }
+  owmResult = master->readBlock(data, dataLen);
+  return owmResult;
+}
+
+error_code DS2431::writeScratchpad(Address targetAddress,
+                                   const Scratchpad & data) {
+  error_code owmResult = selectRom(*master);
+  if (owmResult) {
+    return owmResult;
+  }
+  array<uint_least8_t, 3 + Scratchpad::csize> block = {WriteScratchpad,
+                                                       targetAddress, 0x00};
+  std::copy(data.begin(), data.end(), block.begin() + 3);
+  owmResult = master->writeBlock(block.data(), block.size());
+  if (owmResult) {
+    return owmResult;
+  }
+  const uint_fast16_t calculatedCrc =
+      calculateCrc16(block.data(), block.size()) ^ 0xFFFFU;
+  owmResult = master->readBlock(block.data(), 2);
+  if (owmResult) {
+    return owmResult;
+  }
+  if (calculatedCrc !=
+      ((static_cast<uint_fast16_t>(block[1]) << 8) | block[0])) {
+    owmResult = make_error_code(CrcError);
+  }
+  return owmResult;
+}
+
+error_code DS2431::readScratchpad(Scratchpad & data, uint_least8_t & esByte) {
+  typedef array<uint_least8_t, 6 + Scratchpad::csize> Block;
+
+  error_code owmResult = selectRom(*master);
+  if (owmResult) {
+    return owmResult;
+  }
+  Block block = {ReadScratchpad};
+  owmResult = master->writeByte(block.front());
+  if (owmResult) {
+    return owmResult;
+  }
+  owmResult = master->readBlock(block.data() + 1, block.size() - 1);
+  if (owmResult) {
+    return owmResult;
+  }
+  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(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 {
+    owmResult = make_error_code(CrcError);
+  }
+  return owmResult;
+}
+
+error_code DS2431::copyScratchpad(Address targetAddress, uint_least8_t esByte) {
+  error_code owmResult = selectRom(*master);
+  if (owmResult) {
+    return owmResult;
+  }
+  uint_least8_t block[] = {CopyScratchpad, targetAddress, 0x00};
+  owmResult = master->writeBlock(block, sizeof(block) / sizeof(block[0]));
+  if (owmResult) {
+    return owmResult;
+  }
+  owmResult = master->writeByteSetLevel(esByte, OneWireMaster::StrongLevel);
+  if (owmResult) {
+    return owmResult;
+  }
+  (*sleep)(10);
+  owmResult = master->setLevel(OneWireMaster::NormalLevel);
+  if (owmResult) {
+    return owmResult;
+  }
+  owmResult = master->readByte(block[0]);
+  if (owmResult) {
+    return owmResult;
+  }
+  if (block[0] != 0xAA) {
+    owmResult = make_error_code(OperationFailure);
+  }
+  return owmResult;
+}
+
+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";
+
+      default:
+        return defaultErrorMessage(condition);
+      }
+    }
+  } instance;
+  return instance;
+}
+
+} // namespace MaximInterface