Diff: Devices/DS1920.cpp

Revision:

0:f77ad7f72d04

Child:

5:a8c83a2e6fa4

diff -r 000000000000 -r f77ad7f72d04 Devices/DS1920.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Devices/DS1920.cpp	Mon Nov 06 14:39:18 2017 -0600
@@ -0,0 +1,157 @@
+/*******************************************************************************
+* 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 <MaximInterface/Links/OneWireMaster.hpp>
+#include <MaximInterface/Utilities/Error.hpp>
+#include "DS1920.hpp"
+
+namespace MaximInterface {
+
+enum DS1920_CMDS {
+  WRITE_SCRATCHPAD = 0x4E,
+  READ_SCRATCHPAD = 0xBE,
+  COPY_SCRATCHPAD = 0x48,
+  CONV_TEMPERATURE = 0x44,
+  RECALL = 0xB8
+};
+
+error_code DS1920::writeScratchpad(uint_least8_t th, uint_least8_t tl) {
+  error_code result = selectRom(*master);
+  if (!result) {
+    const uint_least8_t sendBlock[] = {WRITE_SCRATCHPAD, th, tl};
+    result =
+        master->writeBlock(sendBlock, sizeof(sendBlock) / sizeof(sendBlock[0]));
+  }
+  return result;
+}
+
+error_code DS1920::readScratchpad(Scratchpad & scratchpad) {
+  error_code result = selectRom(*master);
+  if (!result) {
+    result = master->writeByte(READ_SCRATCHPAD);
+    if (!result) {
+      result = master->readBlock(scratchpad.data(), scratchpad.size());
+      if (!result) {
+        uint_least8_t receivedCrc;
+        result = master->readByte(receivedCrc);
+        if (!result && (receivedCrc !=
+                        calculateCrc8(scratchpad.data(), scratchpad.size()))) {
+          result = make_error_code(CrcError);
+        }
+      }
+    }
+  }
+  return result;
+}
+
+error_code DS1920::copyScratchpad() {
+  error_code result = selectRom(*master);
+  if (!result) {
+    result =
+        master->writeByteSetLevel(COPY_SCRATCHPAD, OneWireMaster::StrongLevel);
+    if (!result) {
+      (*sleep)(10);
+      result = master->setLevel(OneWireMaster::NormalLevel);
+    }
+  }
+  return result;
+}
+
+error_code DS1920::convertTemperature() {
+  error_code result = selectRom(*master);
+  if (!result) {
+    result =
+        master->writeByteSetLevel(CONV_TEMPERATURE, OneWireMaster::StrongLevel);
+    if (!result) {
+      (*sleep)(750);
+      result = master->setLevel(OneWireMaster::NormalLevel);
+    }
+  }
+  return result;
+}
+
+error_code DS1920::recallEeprom() {
+  error_code result = selectRom(*master);
+  if (!result) {
+    result = master->writeByte(RECALL);
+  }
+  return result;
+}
+
+const error_category & DS1920::errorCategory() {
+  static class : public error_category {
+  public:
+    virtual const char * name() const { return "DS1920"; }
+
+    virtual std::string message(int condition) const {
+      switch (condition) {
+      case CrcError:
+        return "CRC Error";
+
+      case DataError:
+        return "Data Error";
+
+      default:
+        return defaultErrorMessage(condition);
+      }
+    }
+  } instance;
+  return instance;
+}
+
+error_code readTemperature(DS1920 & ds1920, int & temperature) {
+  error_code result = ds1920.convertTemperature();
+  if (result) {
+    return result;
+  }
+  DS1920::Scratchpad scratchpad;
+  result = ds1920.readScratchpad(scratchpad);
+  if (result) {
+    return result;
+  }
+
+  unsigned int tempData =
+      (static_cast<unsigned int>(scratchpad[1]) << 8) | scratchpad[0];
+  const unsigned int signMask = 0xFF00;
+  if ((tempData & signMask) == signMask) {
+    temperature = -0x100;
+    tempData &= ~signMask;
+  } else if ((tempData & signMask) == 0) {
+    temperature = 0;
+  } else {
+    return make_error_code(DS1920::DataError);
+  }
+  temperature += static_cast<int>(tempData);
+  return error_code();
+}
+
+} // namespace MaximInterface