Maxim Integrated / DS1775_Digitial_Thermometer_Thermostat

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_c.cpp@12:3ca79cd71289, 2019-04-07 (annotated)

Committer:
phonemacro
Date:
Sun Apr 07 11:01:21 2019 +0000
Revision:
12:3ca79cd71289
Parent:
11:c3367936f4f2
Child:
14:c74a5b4d6715
updated c code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phonemacro 8:b2d4c71268aa 1 /*******************************************************************************
phonemacro 8:b2d4c71268aa 2 * Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved.
phonemacro 8:b2d4c71268aa 3 *
phonemacro 8:b2d4c71268aa 4 * Permission is hereby granted, free of charge, to any person obtaining a
phonemacro 8:b2d4c71268aa 5 * copy of this software and associated documentation files (the "Software"),
phonemacro 8:b2d4c71268aa 6 * to deal in the Software without restriction, including without limitation
phonemacro 8:b2d4c71268aa 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
phonemacro 8:b2d4c71268aa 8 * and/or sell copies of the Software, and to permit persons to whom the
phonemacro 8:b2d4c71268aa 9 * Software is furnished to do so, subject to the following conditions:
phonemacro 8:b2d4c71268aa 10 *
phonemacro 8:b2d4c71268aa 11 * The above copyright notice and this permission notice shall be included
phonemacro 8:b2d4c71268aa 12 * in all copies or substantial portions of the Software.
phonemacro 8:b2d4c71268aa 13 *
phonemacro 8:b2d4c71268aa 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
phonemacro 8:b2d4c71268aa 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
phonemacro 8:b2d4c71268aa 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
phonemacro 8:b2d4c71268aa 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
phonemacro 8:b2d4c71268aa 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
phonemacro 8:b2d4c71268aa 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
phonemacro 8:b2d4c71268aa 20 * OTHER DEALINGS IN THE SOFTWARE.
phonemacro 8:b2d4c71268aa 21 *
phonemacro 8:b2d4c71268aa 22 * Except as contained in this notice, the name of Maxim Integrated
phonemacro 8:b2d4c71268aa 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
phonemacro 8:b2d4c71268aa 24 * Products, Inc. Branding Policy.
phonemacro 8:b2d4c71268aa 25 *
phonemacro 8:b2d4c71268aa 26 * The mere transfer of this software does not imply any licenses
phonemacro 8:b2d4c71268aa 27 * of trade secrets, proprietary technology, copyrights, patents,
phonemacro 8:b2d4c71268aa 28 * trademarks, maskwork rights, or any other form of intellectual
phonemacro 8:b2d4c71268aa 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
phonemacro 8:b2d4c71268aa 30 * ownership rights.
phonemacro 8:b2d4c71268aa 31 *******************************************************************************
phonemacro 8:b2d4c71268aa 32 */
phonemacro 8:b2d4c71268aa 33 #include "ds1775.h"
phonemacro 8:b2d4c71268aa 34 #include "ds1775_c.h"
phonemacro 8:b2d4c71268aa 35 #include "mbed.h"
phonemacro 8:b2d4c71268aa 36 // #include "USBSerial.h"
phonemacro 8:b2d4c71268aa 37
phonemacro 8:b2d4c71268aa 38
phonemacro 8:b2d4c71268aa 39 /******************************************************************************/
phonemacro 8:b2d4c71268aa 40 /* C version for DS1775 driver */
phonemacro 8:b2d4c71268aa 41 /******************************************************************************/
phonemacro 8:b2d4c71268aa 42
phonemacro 8:b2d4c71268aa 43 /* @var ds1775_write_address, ds1775_read_address
phonemacro 8:b2d4c71268aa 44 * @brief I2C address
phonemacro 8:b2d4c71268aa 45 */
phonemacro 8:b2d4c71268aa 46 uint8_t ds1775_write_address, ds1775_read_address;
phonemacro 8:b2d4c71268aa 47
phonemacro 8:b2d4c71268aa 48 int ds1775_init(uint8_t slave_address)
phonemacro 8:b2d4c71268aa 49 {
phonemacro 8:b2d4c71268aa 50 ds1775_write_address = (slave_address <<1);
phonemacro 8:b2d4c71268aa 51 ds1775_read_address = ((slave_address << 1) | 1);
phonemacro 8:b2d4c71268aa 52 return DS1775_NO_ERROR;
phonemacro 8:b2d4c71268aa 53 }
phonemacro 8:b2d4c71268aa 54
phonemacro 9:315236fb3c6a 55 /******************************************************************************/
phonemacro 11:c3367936f4f2 56 int ds1775_read_cfg_reg(uint8_t *value, I2C &i2c_bus)
phonemacro 9:315236fb3c6a 57 {
phonemacro 9:315236fb3c6a 58 int32_t ret;
phonemacro 9:315236fb3c6a 59 char data[1] = {0};
phonemacro 9:315236fb3c6a 60 char reg = DS1775_REG_CONFIGURATION;
phonemacro 9:315236fb3c6a 61
phonemacro 9:315236fb3c6a 62 /* write to the Register Select, true is for repeated start */
phonemacro 9:315236fb3c6a 63 ret = i2c_bus.write(ds1775_write_address, &reg, 1, true);
phonemacro 9:315236fb3c6a 64 if (ret == 0) {
phonemacro 9:315236fb3c6a 65 ret = i2c_bus.read(ds1775_read_address, data, 1, false);
phonemacro 9:315236fb3c6a 66 if (ret == 0) {
phonemacro 9:315236fb3c6a 67 *value = data[0];
phonemacro 9:315236fb3c6a 68 return DS1775_NO_ERROR;
phonemacro 9:315236fb3c6a 69 } else {
phonemacro 9:315236fb3c6a 70 printf("%s: failed to read data: ret: %d\r\n", __func__, ret);
phonemacro 9:315236fb3c6a 71 }
phonemacro 9:315236fb3c6a 72 } else {
phonemacro 9:315236fb3c6a 73 printf("%s: failed to write to Register Select: ret: %d\r\n",
phonemacro 9:315236fb3c6a 74 __func__, ret);
phonemacro 9:315236fb3c6a 75 }
phonemacro 9:315236fb3c6a 76 return DS1775_ERROR;
phonemacro 9:315236fb3c6a 77 }
phonemacro 9:315236fb3c6a 78
phonemacro 8:b2d4c71268aa 79
phonemacro 8:b2d4c71268aa 80 /******************************************************************************/
phonemacro 10:03645de9c017 81 int ds1775_read_reg(int16_t *value, char reg, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 82 {
phonemacro 8:b2d4c71268aa 83 int32_t ret;
phonemacro 8:b2d4c71268aa 84 char data[2] = {0, 0};
phonemacro 8:b2d4c71268aa 85 ds1775_raw_data tmp;
phonemacro 8:b2d4c71268aa 86
phonemacro 11:c3367936f4f2 87 if (reg == DS1775_REG_TEMPERATURE ||
phonemacro 11:c3367936f4f2 88 (reg == DS1775_REG_THYST_LOW_TRIP ||
phonemacro 11:c3367936f4f2 89 reg == DS1775_REG_TOS_HIGH_TRIP)) {
phonemacro 9:315236fb3c6a 90 /* write to the Register Select, true is for repeated start */
phonemacro 8:b2d4c71268aa 91 ret = i2c_bus.write(ds1775_write_address, &reg, 1, true);
phonemacro 8:b2d4c71268aa 92 /* read the two bytes of data */
phonemacro 8:b2d4c71268aa 93 if (ret == 0) {
phonemacro 8:b2d4c71268aa 94 ret = i2c_bus.read(ds1775_read_address, data, 2, false);
phonemacro 8:b2d4c71268aa 95 if (ret == 0) {
phonemacro 8:b2d4c71268aa 96 tmp.msb = data[0];
phonemacro 8:b2d4c71268aa 97 tmp.lsb = data[1];
phonemacro 10:03645de9c017 98 *value = tmp.swrd;
phonemacro 8:b2d4c71268aa 99 return DS1775_NO_ERROR;
phonemacro 8:b2d4c71268aa 100 } else {
phonemacro 8:b2d4c71268aa 101 printf(
phonemacro 8:b2d4c71268aa 102 "%s: failed to read data: ret: %d\r\n", __func__, ret);
phonemacro 8:b2d4c71268aa 103 }
phonemacro 8:b2d4c71268aa 104 } else {
phonemacro 8:b2d4c71268aa 105 printf("%s: failed to write to Register Select: ret: %d\r\n",
phonemacro 8:b2d4c71268aa 106 __func__, ret);
phonemacro 8:b2d4c71268aa 107 }
phonemacro 8:b2d4c71268aa 108 } else {
phonemacro 8:b2d4c71268aa 109 printf("%s: register address is not correct: register: %d\r\n",
phonemacro 8:b2d4c71268aa 110 __func__, reg);
phonemacro 8:b2d4c71268aa 111 }
phonemacro 8:b2d4c71268aa 112 return DS1775_ERROR;
phonemacro 8:b2d4c71268aa 113 }
phonemacro 8:b2d4c71268aa 114
phonemacro 8:b2d4c71268aa 115 float ds1775_read_reg_as_temperature(uint8_t reg, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 116 {
phonemacro 8:b2d4c71268aa 117 ds1775_raw_data tmp;
phonemacro 8:b2d4c71268aa 118 float temperature;
phonemacro 8:b2d4c71268aa 119 if (reg == DS1775_REG_TEMPERATURE ||
phonemacro 8:b2d4c71268aa 120 reg == DS1775_REG_THYST_LOW_TRIP || reg == DS1775_REG_TOS_HIGH_TRIP) {
phonemacro 10:03645de9c017 121 ds1775_read_reg(&tmp.swrd, reg, i2c_bus);
phonemacro 10:03645de9c017 122 temperature = (float)tmp.swrd;
phonemacro 10:03645de9c017 123 temperature *= DS1775_CF_LSB;
phonemacro 8:b2d4c71268aa 124 return temperature;
phonemacro 8:b2d4c71268aa 125 } else {
phonemacro 8:b2d4c71268aa 126 printf("%s: register is invalid, %d r\n", __func__, reg);
phonemacro 8:b2d4c71268aa 127 return 0;
phonemacro 8:b2d4c71268aa 128 }
phonemacro 8:b2d4c71268aa 129 }
phonemacro 8:b2d4c71268aa 130
phonemacro 8:b2d4c71268aa 131
phonemacro 8:b2d4c71268aa 132 /******************************************************************************/
phonemacro 10:03645de9c017 133 int ds1775_write_reg(int16_t value, char reg, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 134 {
phonemacro 8:b2d4c71268aa 135 int32_t ret;
phonemacro 8:b2d4c71268aa 136 char cmd[3];
phonemacro 8:b2d4c71268aa 137 ds1775_raw_data tmp;
phonemacro 8:b2d4c71268aa 138
phonemacro 8:b2d4c71268aa 139 if (reg >= DS1775_REG_CONFIGURATION && reg <= DS1775_REG_MAX) {
phonemacro 8:b2d4c71268aa 140 cmd[0] = reg;
phonemacro 10:03645de9c017 141 tmp.swrd = value;
phonemacro 8:b2d4c71268aa 142 cmd[1] = tmp.msb;
phonemacro 8:b2d4c71268aa 143 cmd[2] = tmp.lsb;
phonemacro 8:b2d4c71268aa 144 ret = i2c_bus.write(ds1775_write_address, cmd, 3, false);
phonemacro 8:b2d4c71268aa 145 if (ret == 0) {
phonemacro 8:b2d4c71268aa 146 return DS1775_NO_ERROR;
phonemacro 8:b2d4c71268aa 147 } else {
phonemacro 8:b2d4c71268aa 148 printf("%s: I2C write error %d\r\n",__func__, ret);
phonemacro 8:b2d4c71268aa 149 return DS1775_ERROR;
phonemacro 8:b2d4c71268aa 150 }
phonemacro 8:b2d4c71268aa 151 } else {
phonemacro 8:b2d4c71268aa 152 printf("%s: register value invalid %x\r\n",__func__, reg);
phonemacro 8:b2d4c71268aa 153 return DS1775_ERROR;
phonemacro 8:b2d4c71268aa 154 }
phonemacro 8:b2d4c71268aa 155 }
phonemacro 8:b2d4c71268aa 156
phonemacro 9:315236fb3c6a 157 /******************************************************************************/
phonemacro 9:315236fb3c6a 158 int ds1775_write_reg_one_byte(uint8_t value, char reg, I2C &i2c_bus)
phonemacro 9:315236fb3c6a 159 {
phonemacro 9:315236fb3c6a 160 int32_t ret;
phonemacro 9:315236fb3c6a 161 char cmd[2];
phonemacro 8:b2d4c71268aa 162
phonemacro 9:315236fb3c6a 163 if (reg == DS1775_REG_CONFIGURATION) {
phonemacro 9:315236fb3c6a 164 cmd[0] = reg;
phonemacro 9:315236fb3c6a 165 cmd[1] = value;
phonemacro 9:315236fb3c6a 166 ret = i2c_bus.write(ds1775_write_address, cmd, 2, false);
phonemacro 9:315236fb3c6a 167 if (ret == 0) {
phonemacro 9:315236fb3c6a 168 return DS1775_NO_ERROR;
phonemacro 9:315236fb3c6a 169 } else {
phonemacro 9:315236fb3c6a 170 printf("%s: I2C write error %d\r\n",__func__, ret);
phonemacro 9:315236fb3c6a 171 return DS1775_ERROR;
phonemacro 9:315236fb3c6a 172 }
phonemacro 9:315236fb3c6a 173 } else {
phonemacro 9:315236fb3c6a 174 printf("%s: register value invalid %x\r\n",__func__, reg);
phonemacro 9:315236fb3c6a 175 return DS1775_ERROR;
phonemacro 9:315236fb3c6a 176 }
phonemacro 9:315236fb3c6a 177 }
phonemacro 9:315236fb3c6a 178
phonemacro 11:c3367936f4f2 179 int ds1775_write_cfg_reg(uint8_t cfg, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 180 {
phonemacro 10:03645de9c017 181 return ds1775_write_reg_one_byte(cfg, DS1775_REG_CONFIGURATION, i2c_bus);
phonemacro 8:b2d4c71268aa 182 }
phonemacro 8:b2d4c71268aa 183
phonemacro 8:b2d4c71268aa 184
phonemacro 8:b2d4c71268aa 185 int ds1775_write_trip_low(float temperature, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 186 {
phonemacro 8:b2d4c71268aa 187 ds1775_raw_data raw;
phonemacro 10:03645de9c017 188 temperature /= DS1775_CF_LSB;
phonemacro 10:03645de9c017 189 raw.swrd = int16_t(temperature);
phonemacro 10:03645de9c017 190 return ds1775_write_reg(raw.swrd, DS1775_REG_THYST_LOW_TRIP, i2c_bus);
phonemacro 8:b2d4c71268aa 191 }
phonemacro 8:b2d4c71268aa 192
phonemacro 8:b2d4c71268aa 193
phonemacro 8:b2d4c71268aa 194 int ds1775_write_trip_high(float temperature, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 195 {
phonemacro 8:b2d4c71268aa 196 ds1775_raw_data raw;
phonemacro 10:03645de9c017 197 temperature /= DS1775_CF_LSB;
phonemacro 10:03645de9c017 198 raw.swrd = int16_t(temperature);
phonemacro 10:03645de9c017 199 return ds1775_write_reg(raw.swrd, DS1775_REG_TOS_HIGH_TRIP, i2c_bus);
phonemacro 8:b2d4c71268aa 200 }
phonemacro 8:b2d4c71268aa 201
phonemacro 8:b2d4c71268aa 202
phonemacro 8:b2d4c71268aa 203 float ds1775_celsius_to_fahrenheit(float temp_c)
phonemacro 8:b2d4c71268aa 204 {
phonemacro 8:b2d4c71268aa 205 float temp_f;
phonemacro 8:b2d4c71268aa 206 temp_f = ((temp_c * 9)/5) + 32;
phonemacro 8:b2d4c71268aa 207 return temp_f;
phonemacro 8:b2d4c71268aa 208 }