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@18:69436cb7b19e, 2019-04-08 (annotated)

Committer:
phonemacro
Date:
Mon Apr 08 17:02:40 2019 +0000
Revision:
18:69436cb7b19e
Parent:
17:ca86c0b37244 
rename write thys, tos procedures. make ds1775_write_reg16 local in the 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 15:449134e4b43f 81 int ds1775_read_reg16(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 14:c74a5b4d6715 88 reg == DS1775_REG_THYST_LOW_TRIP || reg == DS1775_REG_TOS_HIGH_TRIP) {
phonemacro 9:315236fb3c6a 89 /* write to the Register Select, true is for repeated start */
phonemacro 8:b2d4c71268aa 90 ret = i2c_bus.write(ds1775_write_address, &reg, 1, true);
phonemacro 8:b2d4c71268aa 91 /* read the two bytes of data */
phonemacro 8:b2d4c71268aa 92 if (ret == 0) {
phonemacro 8:b2d4c71268aa 93 ret = i2c_bus.read(ds1775_read_address, data, 2, false);
phonemacro 8:b2d4c71268aa 94 if (ret == 0) {
phonemacro 8:b2d4c71268aa 95 tmp.msb = data[0];
phonemacro 8:b2d4c71268aa 96 tmp.lsb = data[1];
phonemacro 10:03645de9c017 97 *value = tmp.swrd;
phonemacro 8:b2d4c71268aa 98 return DS1775_NO_ERROR;
phonemacro 8:b2d4c71268aa 99 } else {
phonemacro 8:b2d4c71268aa 100 printf(
phonemacro 8:b2d4c71268aa 101 "%s: failed to read data: ret: %d\r\n", __func__, ret);
phonemacro 8:b2d4c71268aa 102 }
phonemacro 8:b2d4c71268aa 103 } else {
phonemacro 8:b2d4c71268aa 104 printf("%s: failed to write to Register Select: ret: %d\r\n",
phonemacro 8:b2d4c71268aa 105 __func__, ret);
phonemacro 8:b2d4c71268aa 106 }
phonemacro 8:b2d4c71268aa 107 } else {
phonemacro 8:b2d4c71268aa 108 printf("%s: register address is not correct: register: %d\r\n",
phonemacro 8:b2d4c71268aa 109 __func__, reg);
phonemacro 8:b2d4c71268aa 110 }
phonemacro 8:b2d4c71268aa 111 return DS1775_ERROR;
phonemacro 8:b2d4c71268aa 112 }
phonemacro 8:b2d4c71268aa 113
phonemacro 8:b2d4c71268aa 114 float ds1775_read_reg_as_temperature(uint8_t reg, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 115 {
phonemacro 8:b2d4c71268aa 116 ds1775_raw_data tmp;
phonemacro 8:b2d4c71268aa 117 float temperature;
phonemacro 8:b2d4c71268aa 118 if (reg == DS1775_REG_TEMPERATURE ||
phonemacro 8:b2d4c71268aa 119 reg == DS1775_REG_THYST_LOW_TRIP || reg == DS1775_REG_TOS_HIGH_TRIP) {
phonemacro 15:449134e4b43f 120 ds1775_read_reg16(&tmp.swrd, reg, i2c_bus);
phonemacro 14:c74a5b4d6715 121 temperature = (float)tmp.swrd; /* values are 2's complement */
phonemacro 10:03645de9c017 122 temperature *= DS1775_CF_LSB;
phonemacro 8:b2d4c71268aa 123 return temperature;
phonemacro 8:b2d4c71268aa 124 } else {
phonemacro 8:b2d4c71268aa 125 printf("%s: register is invalid, %d r\n", __func__, reg);
phonemacro 8:b2d4c71268aa 126 return 0;
phonemacro 8:b2d4c71268aa 127 }
phonemacro 8:b2d4c71268aa 128 }
phonemacro 8:b2d4c71268aa 129
phonemacro 8:b2d4c71268aa 130
phonemacro 8:b2d4c71268aa 131 /******************************************************************************/
phonemacro 15:449134e4b43f 132 int ds1775_write_reg16(int16_t value, char reg, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 133 {
phonemacro 8:b2d4c71268aa 134 int32_t ret;
phonemacro 8:b2d4c71268aa 135 char cmd[3];
phonemacro 8:b2d4c71268aa 136 ds1775_raw_data tmp;
phonemacro 8:b2d4c71268aa 137
phonemacro 14:c74a5b4d6715 138 if (reg >= DS1775_REG_THYST_LOW_TRIP && reg <= DS1775_REG_MAX) {
phonemacro 8:b2d4c71268aa 139 cmd[0] = reg;
phonemacro 10:03645de9c017 140 tmp.swrd = value;
phonemacro 8:b2d4c71268aa 141 cmd[1] = tmp.msb;
phonemacro 8:b2d4c71268aa 142 cmd[2] = tmp.lsb;
phonemacro 8:b2d4c71268aa 143 ret = i2c_bus.write(ds1775_write_address, cmd, 3, false);
phonemacro 8:b2d4c71268aa 144 if (ret == 0) {
phonemacro 8:b2d4c71268aa 145 return DS1775_NO_ERROR;
phonemacro 8:b2d4c71268aa 146 } else {
phonemacro 8:b2d4c71268aa 147 printf("%s: I2C write error %d\r\n",__func__, ret);
phonemacro 8:b2d4c71268aa 148 return DS1775_ERROR;
phonemacro 8:b2d4c71268aa 149 }
phonemacro 8:b2d4c71268aa 150 } else {
phonemacro 8:b2d4c71268aa 151 printf("%s: register value invalid %x\r\n",__func__, reg);
phonemacro 8:b2d4c71268aa 152 return DS1775_ERROR;
phonemacro 8:b2d4c71268aa 153 }
phonemacro 8:b2d4c71268aa 154 }
phonemacro 8:b2d4c71268aa 155
phonemacro 17:ca86c0b37244 156
phonemacro 17:ca86c0b37244 157 int ds1775_write_cfg_reg(uint8_t cfg, I2C &i2c_bus)
phonemacro 9:315236fb3c6a 158 {
phonemacro 9:315236fb3c6a 159 int32_t ret;
phonemacro 9:315236fb3c6a 160 char cmd[2];
phonemacro 8:b2d4c71268aa 161
phonemacro 17:ca86c0b37244 162 cmd[0] = DS1775_REG_CONFIGURATION;
phonemacro 17:ca86c0b37244 163 cmd[1] = cfg;
phonemacro 17:ca86c0b37244 164 ret = i2c_bus.write(ds1775_write_address, cmd, 2, false);
phonemacro 17:ca86c0b37244 165 if (ret == 0) {
phonemacro 17:ca86c0b37244 166 return DS1775_NO_ERROR;
phonemacro 9:315236fb3c6a 167 } else {
phonemacro 17:ca86c0b37244 168 printf("%s: I2C write error %d\r\n",__func__, ret);
phonemacro 9:315236fb3c6a 169 return DS1775_ERROR;
phonemacro 9:315236fb3c6a 170 }
phonemacro 9:315236fb3c6a 171 }
phonemacro 9:315236fb3c6a 172
phonemacro 8:b2d4c71268aa 173
phonemacro 18:69436cb7b19e 174 int ds1775_write_trip_low_thyst(float temperature, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 175 {
phonemacro 8:b2d4c71268aa 176 ds1775_raw_data raw;
phonemacro 10:03645de9c017 177 temperature /= DS1775_CF_LSB;
phonemacro 10:03645de9c017 178 raw.swrd = int16_t(temperature);
phonemacro 15:449134e4b43f 179 return ds1775_write_reg16(raw.swrd, DS1775_REG_THYST_LOW_TRIP, i2c_bus);
phonemacro 8:b2d4c71268aa 180 }
phonemacro 8:b2d4c71268aa 181
phonemacro 8:b2d4c71268aa 182
phonemacro 18:69436cb7b19e 183 int ds1775_write_trip_high_tos(float temperature, I2C &i2c_bus)
phonemacro 8:b2d4c71268aa 184 {
phonemacro 8:b2d4c71268aa 185 ds1775_raw_data raw;
phonemacro 10:03645de9c017 186 temperature /= DS1775_CF_LSB;
phonemacro 10:03645de9c017 187 raw.swrd = int16_t(temperature);
phonemacro 15:449134e4b43f 188 return ds1775_write_reg16(raw.swrd, DS1775_REG_TOS_HIGH_TRIP, i2c_bus);
phonemacro 8:b2d4c71268aa 189 }
phonemacro 8:b2d4c71268aa 190
phonemacro 8:b2d4c71268aa 191
phonemacro 8:b2d4c71268aa 192 float ds1775_celsius_to_fahrenheit(float temp_c)
phonemacro 8:b2d4c71268aa 193 {
phonemacro 8:b2d4c71268aa 194 float temp_f;
phonemacro 8:b2d4c71268aa 195 temp_f = ((temp_c * 9)/5) + 32;
phonemacro 8:b2d4c71268aa 196 return temp_f;
phonemacro 8:b2d4c71268aa 197 }