Diff: Devices/DS18B20.hpp

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0:f77ad7f72d04

Child:

6:a8c83a2e6fa4

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+++ b/Devices/DS18B20.hpp	Mon Nov 06 14:39:18 2017 -0600
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+/*******************************************************************************
+* 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.
+*******************************************************************************/
+
+#ifndef MaximInterface_DS18B20
+#define MaximInterface_DS18B20
+
+#include <MaximInterface/Links/SelectRom.hpp>
+#include <MaximInterface/Links/Sleep.hpp>
+#include <MaximInterface/Utilities/Export.h>
+
+namespace MaximInterface {
+
+/// DS18B20 Programmable Resolution 1-Wire Digital Thermometer
+/// @details The DS18B20 digital thermometer provides 9-bit to 12-bit
+/// Celsius temperature measurements and has an alarm function with
+/// nonvolatile user-programmable upper and lower trigger points. The
+/// DS18B20 communicates over a 1-Wire bus that by definition requires
+/// only one data line (and ground) for communication with a central
+/// microprocessor. In addition, the DS18B20 can derive power directly
+/// from the data line ("parasite power"), eliminating the need for an
+/// external power supply.
+class DS18B20 {
+public:
+  enum ErrorValue { CrcError = 1, DataError };
+
+  static const uint_least8_t nineBitResolution = 0x1F;
+  static const uint_least8_t tenBitResolution = 0x3F;
+  static const uint_least8_t elevenBitResolution = 0x5F;
+  static const uint_least8_t twelveBitResolution = 0x7F;
+
+  /// Holds the contents of the device scratchpad.
+  typedef array<uint_least8_t, 8> Scratchpad;
+
+  DS18B20(const Sleep & sleep, OneWireMaster & master,
+          const SelectRom & selectRom)
+      : selectRom(selectRom), master(&master), sleep(&sleep), resolution(0) {}
+
+  void setSleep(const Sleep & sleep) { this->sleep = &sleep; }
+  void setMaster(OneWireMaster & master) { this->master = &master; }
+  void setSelectRom(const SelectRom & selectRom) {
+    this->selectRom = selectRom;
+  }
+
+  /// Initializes the device for first time use.
+  MaximInterface_EXPORT error_code initialize();
+
+  /// Write Scratchpad Command
+  /// @details If the result of a temperature measurement is higher
+  /// than TH or lower than TL, an alarm flag inside the device is
+  /// set. This flag is updated with every temperature measurement.
+  /// As long as the alarm flag is set, the DS1920 will respond to
+  /// the alarm search command.
+  /// @param[in] th 8-bit upper temperature threshold, MSB indicates sign.
+  /// @param[in] tl 8-bit lower temperature threshold, LSB indicates sign.
+  /// @param[in] res Resolution of the DS18B20.
+  MaximInterface_EXPORT error_code writeScratchpad(uint_least8_t th,
+                                                   uint_least8_t tl,
+                                                   uint_least8_t res);
+
+  /// Read Scratchpad Command
+  /// @param[out] scratchpad Contents of scratchpad.
+  MaximInterface_EXPORT error_code readScratchpad(Scratchpad & scratchpad);
+
+  /// Copy Scratchpad Command
+  /// @details This command copies from the scratchpad into the
+  /// EEPROM of the DS18B20, storing the temperature trigger bytes
+  /// and resolution in nonvolatile memory.
+  MaximInterface_EXPORT error_code copyScratchpad();
+
+  /// Read Power Supply command
+  /// @details This command determines if the DS18B20 is parasite
+  /// powered or has a local supply
+  /// @param[out] localPower
+  /// True if the device is powered by a local power supply, or false if the
+  /// device is parasitically powered.
+  MaximInterface_EXPORT error_code readPowerSupply(bool & localPower);
+
+  /// Convert Temperature Command
+  /// @details This command begins a temperature conversion.
+  MaximInterface_EXPORT error_code convertTemperature();
+
+  /// Recall Command
+  /// @details This command recalls the temperature trigger values
+  /// and resolution stored in EEPROM to the scratchpad.
+  MaximInterface_EXPORT error_code recallEeprom();
+
+  MaximInterface_EXPORT static const error_category & errorCategory();
+
+private:
+  SelectRom selectRom;
+  OneWireMaster * master;
+  const Sleep * sleep;
+  uint_least8_t resolution;
+};
+
+/// Reads the current temperature as an integer value with decimal.
+/// @param[out] temperature Temperature in degrees Celsius multiplied by 2.
+MaximInterface_EXPORT error_code readTemperature(DS18B20 & ds18b20,
+                                                 int & temperature);
+
+inline error_code make_error_code(DS18B20::ErrorValue e) {
+  return error_code(e, DS18B20::errorCategory());
+}
+
+} // namespace MaximInterface
+
+#endif