DS7505 C, C++ driver source code: The DS7505 low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9 to 12-bit digital temperature readings over a -55°C to +125°C range with +-0.5°C accuracy in the 0°C (32°F) to +70°C (158°F) range.
Dependents: DS7505_Temperature_Sensor_Low_Power
Diff: ds7505_c.cpp
- Revision:
- 25:93287f99d225
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ds7505_c.cpp Sat Apr 27 09:50:48 2019 +0000 @@ -0,0 +1,197 @@ +/******************************************************************************* +* 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 "ds7505.h" +#include "ds7505_c.h" +#include "mbed.h" +// #include "USBSerial.h" + + +/******************************************************************************/ +/* C version for DS7505 driver */ +/******************************************************************************/ + +/* @var ds7505_write_address, ds7505_read_address + * @brief I2C address + */ +uint8_t ds7505_write_address, ds7505_read_address; + +int ds7505_init(uint8_t slave_address) +{ + ds7505_write_address = (slave_address <<1); + ds7505_read_address = ((slave_address << 1) | 1); + return DS7505_NO_ERROR; +} + +/******************************************************************************/ +int ds7505_read_cfg_reg(uint8_t *value, I2C &i2c_bus) +{ + int32_t ret; + char data[1] = {0}; + char reg = DS7505_REG_CONFIGURATION; + + /* write to the Register Select, true is for repeated start */ + ret = i2c_bus.write(ds7505_write_address, ®, 1, true); + if (ret == 0) { + ret = i2c_bus.read(ds7505_read_address, data, 1, false); + if (ret == 0) { + *value = data[0]; + return DS7505_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); + } + return DS7505_ERROR; +} + + +/******************************************************************************/ +int ds7505_read_reg16(int16_t *value, char reg, I2C &i2c_bus) +{ + int32_t ret; + char data[2] = {0, 0}; + ds7505_raw_data tmp; + + if (reg == DS7505_REG_TEMPERATURE || + reg == DS7505_REG_THYST_LOW_TRIP || reg == DS7505_REG_TOS_HIGH_TRIP) { + /* write to the Register Select, true is for repeated start */ + ret = i2c_bus.write(ds7505_write_address, ®, 1, true); + /* read the two bytes of data */ + if (ret == 0) { + ret = i2c_bus.read(ds7505_read_address, data, 2, false); + if (ret == 0) { + tmp.msb = data[0]; + tmp.lsb = data[1]; + *value = tmp.swrd; + return DS7505_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 DS7505_ERROR; +} + +float ds7505_read_reg_as_temperature(uint8_t reg, I2C &i2c_bus) +{ + ds7505_raw_data tmp; + float temperature; + if (reg == DS7505_REG_TEMPERATURE || + reg == DS7505_REG_THYST_LOW_TRIP || reg == DS7505_REG_TOS_HIGH_TRIP) { + ds7505_read_reg16(&tmp.swrd, reg, i2c_bus); + temperature = (float)tmp.swrd; /* values are 2's complement */ + temperature *= DS7505_CF_LSB; + return temperature; + } else { + printf("%s: register is invalid, %d r\n", __func__, reg); + return 0; + } +} + + +/******************************************************************************/ +int ds7505_write_reg16(int16_t value, char reg, I2C &i2c_bus) +{ + int32_t ret; + char cmd[3]; + ds7505_raw_data tmp; + + if (reg >= DS7505_REG_THYST_LOW_TRIP && reg <= DS7505_REG_MAX) { + cmd[0] = reg; + tmp.swrd = value; + cmd[1] = tmp.msb; + cmd[2] = tmp.lsb; + ret = i2c_bus.write(ds7505_write_address, cmd, 3, false); + if (ret == 0) { + return DS7505_NO_ERROR; + } else { + printf("%s: I2C write error %d\r\n",__func__, ret); + return DS7505_ERROR; + } + } else { + printf("%s: register value invalid %x\r\n",__func__, reg); + return DS7505_ERROR; + } +} + + +int ds7505_write_cfg_reg(uint8_t cfg, I2C &i2c_bus) +{ + int32_t ret; + char cmd[2]; + + cmd[0] = DS7505_REG_CONFIGURATION; + cmd[1] = cfg; + ret = i2c_bus.write(ds7505_write_address, cmd, 2, false); + if (ret == 0) { + return DS7505_NO_ERROR; + } else { + printf("%s: I2C write error %d\r\n",__func__, ret); + return DS7505_ERROR; + } +} + + +int ds7505_write_trip_low_thyst(float temperature, I2C &i2c_bus) +{ + ds7505_raw_data raw; + temperature /= DS7505_CF_LSB; + raw.swrd = int16_t(temperature); + return ds7505_write_reg16(raw.swrd, DS7505_REG_THYST_LOW_TRIP, i2c_bus); +} + + +int ds7505_write_trip_high_tos(float temperature, I2C &i2c_bus) +{ + ds7505_raw_data raw; + temperature /= DS7505_CF_LSB; + raw.swrd = int16_t(temperature); + return ds7505_write_reg16(raw.swrd, DS7505_REG_TOS_HIGH_TRIP, i2c_bus); +} + + +float ds7505_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