C code and C++ library, driver software for Maxim Integrated DS1775, DS75 thermometer and thermostat temperature sensor. Code supports continuous or shut-down/standby, hysteresis, alarm limits, comparator or interrupt mode, fault filtering, and active low/high. Compact 5-pin SOT23 packaging
Dependents: DS1775_Digital_Thermostat_Temperature
ds1775_cpp.cpp
- Committer:
- phonemacro
- Date:
- 2019-04-07
- Revision:
- 8:b2d4c71268aa
- Child:
- 9:315236fb3c6a
File content as of revision 8:b2d4c71268aa:
/******************************************************************************* * Copyright (C) 2019 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 "ds1775.h" #include "ds1775_cpp.h" #include "mbed.h" // #include "USBSerial.h" /****************************************************************************** * C++ version for DS1775 driver * ****************************************************************************** */ /******************************************************************************/ DS1775::DS1775(I2C &i2c_bus, uint8_t slave_address): m_i2c(i2c_bus), m_write_address(slave_address <<1), m_read_address ((slave_address << 1) | 1) { m_extended_format = 0; } /******************************************************************************/ DS1775::~DS1775(void) { /** empty block */ } /******************************************************************************/ int DS1775::read_reg(uint16_t *value, char reg) { int32_t ret; char data[2] = {0, 0}; ds1775_raw_data tmp; if (reg <= DS1775_REG_MAX) { /* write to the Register Select */ ret = m_i2c.write(m_write_address, ®, 1, true); /* read the two bytes of data */ if (ret == 0) { ret = m_i2c.read(m_read_address, data, 2, false); if (ret == 0) { tmp.msb = data[0]; tmp.lsb = data[1]; *value = tmp.uwrd; return DS1775_NO_ERROR; } else { printf( "%s: failed to read data: ret: %d\r\n", __func__, ret); } } else { printf("%s: failed to write to Register Select: ret: %d\r\n", __func__, ret); } } else { printf("%s: register address is not correct: register: %d\r\n", __func__, reg); } return DS1775_ERROR; } /******************************************************************************/ float DS1775::read_reg_as_temperature(uint8_t reg) { ds1775_raw_data tmp; float temperature; if (reg == DS1775_REG_TEMPERATURE || reg == DS1775_REG_THYST_LOW_TRIP || reg == DS1775_REG_TOS_HIGH_TRIP) { read_reg(&tmp.uwrd, reg); temperature = (float)tmp.magnitude_bits; if (m_extended_format) temperature *= DS1775_CF_EXTENDED_FORMAT; else temperature *= DS1775_CF_NORMAL_FORMAT; if (tmp.sign_bit) temperature = -temperature; return temperature; } else { printf("%s: register is invalid, %d r\n", __func__, reg); return 0; } } /******************************************************************************/ int DS1775::write_reg(uint16_t value, char reg) { int32_t ret; char cmd[3]; ds1775_raw_data tmp; if (reg >= DS1775_REG_CONFIGURATION && reg <= DS1775_REG_MAX) { cmd[0] = reg; tmp.uwrd = value; cmd[1] = tmp.msb; cmd[2] = tmp.lsb; ret = m_i2c.write(m_write_address, cmd, 3, false); if (ret == 0) { if (DS1775_REG_CONFIGURATION == reg) { m_extended_format = 0; if (tmp.uwrd & DS1775_CFG_EXTENDED_FORMAT) m_extended_format = 1; } return DS1775_NO_ERROR; } else { printf("%s: I2C write error %d\r\n",__func__, ret); return DS1775_ERROR; } } else { printf("%s: register value invalid %x\r\n",__func__, reg); return DS1775_ERROR; } } /******************************************************************************/ int DS1775::write_cfg(uint16_t cfg) { return write_reg(cfg, DS1775_REG_CONFIGURATION); } /******************************************************************************/ int DS1775::write_trip_low(float temperature) { ds1775_raw_data raw; raw.uwrd = 0; if (temperature < 0) { raw.sign_bit = 1; temperature = -temperature; } if (m_extended_format) temperature /= DS1775_CF_EXTENDED_FORMAT; else temperature /= DS1775_CF_NORMAL_FORMAT; raw.magnitude_bits = uint16_t(temperature); return write_reg(raw.uwrd, DS1775_REG_THYST_LOW_TRIP); } /******************************************************************************/ int DS1775::write_trip_high(float temperature) { ds1775_raw_data raw; raw.uwrd = 0; if (temperature < 0) { raw.sign_bit = 1; temperature = -temperature; } if (m_extended_format) temperature /= DS1775_CF_EXTENDED_FORMAT; else temperature /= DS1775_CF_NORMAL_FORMAT; raw.magnitude_bits = uint16_t(temperature); return write_reg(raw.uwrd, DS1775_REG_TOS_HIGH_TRIP); } /******************************************************************************/ float DS1775::celsius_to_fahrenheit(float temp_c) { float temp_f; temp_f = ((temp_c * 9)/5) + 32; return temp_f; }