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
Diff: ds1775_cpp.cpp
- Revision:
- 8:b2d4c71268aa
- Child:
- 9:315236fb3c6a
diff -r 3312665c8c4b -r b2d4c71268aa ds1775_cpp.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ds1775_cpp.cpp Sun Apr 07 07:43:11 2019 +0000 @@ -0,0 +1,190 @@ +/******************************************************************************* +* 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; +} \ No newline at end of file