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@8:b2d4c71268aa, 2019-04-07 (annotated)
- Committer:
- phonemacro
- Date:
- Sun Apr 07 07:43:11 2019 +0000
- Revision:
- 8:b2d4c71268aa
- Child:
- 9:315236fb3c6a
update
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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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 | /* @var ds1775_write_address, ds1775_read_address |
phonemacro | 8:b2d4c71268aa | 48 | * @brief ds1775_extended_format |
phonemacro | 8:b2d4c71268aa | 49 | */ |
phonemacro | 8:b2d4c71268aa | 50 | uint32_t ds1775_extended_format; |
phonemacro | 8:b2d4c71268aa | 51 | |
phonemacro | 8:b2d4c71268aa | 52 | int ds1775_init(uint8_t slave_address) |
phonemacro | 8:b2d4c71268aa | 53 | { |
phonemacro | 8:b2d4c71268aa | 54 | ds1775_write_address = (slave_address <<1); |
phonemacro | 8:b2d4c71268aa | 55 | ds1775_read_address = ((slave_address << 1) | 1); |
phonemacro | 8:b2d4c71268aa | 56 | ds1775_extended_format = 0; |
phonemacro | 8:b2d4c71268aa | 57 | return DS1775_NO_ERROR; |
phonemacro | 8:b2d4c71268aa | 58 | } |
phonemacro | 8:b2d4c71268aa | 59 | |
phonemacro | 8:b2d4c71268aa | 60 | |
phonemacro | 8:b2d4c71268aa | 61 | /******************************************************************************/ |
phonemacro | 8:b2d4c71268aa | 62 | int ds1775_read_reg(uint16_t *value, char reg, I2C &i2c_bus) |
phonemacro | 8:b2d4c71268aa | 63 | { |
phonemacro | 8:b2d4c71268aa | 64 | int32_t ret; |
phonemacro | 8:b2d4c71268aa | 65 | char data[2] = {0, 0}; |
phonemacro | 8:b2d4c71268aa | 66 | ds1775_raw_data tmp; |
phonemacro | 8:b2d4c71268aa | 67 | |
phonemacro | 8:b2d4c71268aa | 68 | if (reg <= DS1775_REG_MAX) { |
phonemacro | 8:b2d4c71268aa | 69 | /* write to the Register Select */ |
phonemacro | 8:b2d4c71268aa | 70 | ret = i2c_bus.write(ds1775_write_address, ®, 1, true); |
phonemacro | 8:b2d4c71268aa | 71 | /* read the two bytes of data */ |
phonemacro | 8:b2d4c71268aa | 72 | if (ret == 0) { |
phonemacro | 8:b2d4c71268aa | 73 | ret = i2c_bus.read(ds1775_read_address, data, 2, false); |
phonemacro | 8:b2d4c71268aa | 74 | printf( |
phonemacro | 8:b2d4c71268aa | 75 | "%s: msb lsb %x %x \r\n", __func__, tmp.msb, tmp.lsb); |
phonemacro | 8:b2d4c71268aa | 76 | if (ret == 0) { |
phonemacro | 8:b2d4c71268aa | 77 | tmp.msb = data[0]; |
phonemacro | 8:b2d4c71268aa | 78 | tmp.lsb = data[1]; |
phonemacro | 8:b2d4c71268aa | 79 | *value = tmp.uwrd; |
phonemacro | 8:b2d4c71268aa | 80 | return DS1775_NO_ERROR; |
phonemacro | 8:b2d4c71268aa | 81 | } else { |
phonemacro | 8:b2d4c71268aa | 82 | printf( |
phonemacro | 8:b2d4c71268aa | 83 | "%s: failed to read data: ret: %d\r\n", __func__, ret); |
phonemacro | 8:b2d4c71268aa | 84 | } |
phonemacro | 8:b2d4c71268aa | 85 | } else { |
phonemacro | 8:b2d4c71268aa | 86 | printf("%s: failed to write to Register Select: ret: %d\r\n", |
phonemacro | 8:b2d4c71268aa | 87 | __func__, ret); |
phonemacro | 8:b2d4c71268aa | 88 | } |
phonemacro | 8:b2d4c71268aa | 89 | } else { |
phonemacro | 8:b2d4c71268aa | 90 | printf("%s: register address is not correct: register: %d\r\n", |
phonemacro | 8:b2d4c71268aa | 91 | __func__, reg); |
phonemacro | 8:b2d4c71268aa | 92 | } |
phonemacro | 8:b2d4c71268aa | 93 | return DS1775_ERROR; |
phonemacro | 8:b2d4c71268aa | 94 | } |
phonemacro | 8:b2d4c71268aa | 95 | |
phonemacro | 8:b2d4c71268aa | 96 | float ds1775_read_reg_as_temperature(uint8_t reg, I2C &i2c_bus) |
phonemacro | 8:b2d4c71268aa | 97 | { |
phonemacro | 8:b2d4c71268aa | 98 | ds1775_raw_data tmp; |
phonemacro | 8:b2d4c71268aa | 99 | float temperature; |
phonemacro | 8:b2d4c71268aa | 100 | if (reg == DS1775_REG_TEMPERATURE || |
phonemacro | 8:b2d4c71268aa | 101 | reg == DS1775_REG_THYST_LOW_TRIP || reg == DS1775_REG_TOS_HIGH_TRIP) { |
phonemacro | 8:b2d4c71268aa | 102 | ds1775_read_reg(&tmp.uwrd, reg, i2c_bus); |
phonemacro | 8:b2d4c71268aa | 103 | temperature = (float)tmp.magnitude_bits; |
phonemacro | 8:b2d4c71268aa | 104 | if (ds1775_extended_format) |
phonemacro | 8:b2d4c71268aa | 105 | temperature *= DS1775_CF_EXTENDED_FORMAT; |
phonemacro | 8:b2d4c71268aa | 106 | else |
phonemacro | 8:b2d4c71268aa | 107 | temperature *= DS1775_CF_NORMAL_FORMAT; |
phonemacro | 8:b2d4c71268aa | 108 | if (tmp.sign_bit) |
phonemacro | 8:b2d4c71268aa | 109 | temperature = -temperature; |
phonemacro | 8:b2d4c71268aa | 110 | return temperature; |
phonemacro | 8:b2d4c71268aa | 111 | |
phonemacro | 8:b2d4c71268aa | 112 | return temperature; |
phonemacro | 8:b2d4c71268aa | 113 | } else { |
phonemacro | 8:b2d4c71268aa | 114 | printf("%s: register is invalid, %d r\n", __func__, reg); |
phonemacro | 8:b2d4c71268aa | 115 | return 0; |
phonemacro | 8:b2d4c71268aa | 116 | } |
phonemacro | 8:b2d4c71268aa | 117 | } |
phonemacro | 8:b2d4c71268aa | 118 | |
phonemacro | 8:b2d4c71268aa | 119 | |
phonemacro | 8:b2d4c71268aa | 120 | /******************************************************************************/ |
phonemacro | 8:b2d4c71268aa | 121 | int ds1775_write_reg(uint16_t value, char reg, I2C &i2c_bus) |
phonemacro | 8:b2d4c71268aa | 122 | { |
phonemacro | 8:b2d4c71268aa | 123 | int32_t ret; |
phonemacro | 8:b2d4c71268aa | 124 | char cmd[3]; |
phonemacro | 8:b2d4c71268aa | 125 | ds1775_raw_data tmp; |
phonemacro | 8:b2d4c71268aa | 126 | |
phonemacro | 8:b2d4c71268aa | 127 | if (reg >= DS1775_REG_CONFIGURATION && reg <= DS1775_REG_MAX) { |
phonemacro | 8:b2d4c71268aa | 128 | cmd[0] = reg; |
phonemacro | 8:b2d4c71268aa | 129 | tmp.uwrd = value; |
phonemacro | 8:b2d4c71268aa | 130 | cmd[1] = tmp.msb; |
phonemacro | 8:b2d4c71268aa | 131 | cmd[2] = tmp.lsb; |
phonemacro | 8:b2d4c71268aa | 132 | ret = i2c_bus.write(ds1775_write_address, cmd, 3, false); |
phonemacro | 8:b2d4c71268aa | 133 | if (ret == 0) { |
phonemacro | 8:b2d4c71268aa | 134 | if (DS1775_REG_CONFIGURATION == reg) { |
phonemacro | 8:b2d4c71268aa | 135 | ds1775_extended_format = 0; |
phonemacro | 8:b2d4c71268aa | 136 | if (tmp.uwrd & DS1775_CFG_EXTENDED_FORMAT) |
phonemacro | 8:b2d4c71268aa | 137 | ds1775_extended_format = 1; |
phonemacro | 8:b2d4c71268aa | 138 | } |
phonemacro | 8:b2d4c71268aa | 139 | return DS1775_NO_ERROR; |
phonemacro | 8:b2d4c71268aa | 140 | } else { |
phonemacro | 8:b2d4c71268aa | 141 | printf("%s: I2C write error %d\r\n",__func__, ret); |
phonemacro | 8:b2d4c71268aa | 142 | return DS1775_ERROR; |
phonemacro | 8:b2d4c71268aa | 143 | } |
phonemacro | 8:b2d4c71268aa | 144 | } else { |
phonemacro | 8:b2d4c71268aa | 145 | printf("%s: register value invalid %x\r\n",__func__, reg); |
phonemacro | 8:b2d4c71268aa | 146 | return DS1775_ERROR; |
phonemacro | 8:b2d4c71268aa | 147 | } |
phonemacro | 8:b2d4c71268aa | 148 | } |
phonemacro | 8:b2d4c71268aa | 149 | |
phonemacro | 8:b2d4c71268aa | 150 | |
phonemacro | 8:b2d4c71268aa | 151 | int ds1775_write_cfg(uint16_t cfg, I2C &i2c_bus) |
phonemacro | 8:b2d4c71268aa | 152 | { |
phonemacro | 8:b2d4c71268aa | 153 | return ds1775_write_reg(cfg, DS1775_REG_CONFIGURATION, i2c_bus); |
phonemacro | 8:b2d4c71268aa | 154 | } |
phonemacro | 8:b2d4c71268aa | 155 | |
phonemacro | 8:b2d4c71268aa | 156 | |
phonemacro | 8:b2d4c71268aa | 157 | int ds1775_write_trip_low(float temperature, I2C &i2c_bus) |
phonemacro | 8:b2d4c71268aa | 158 | { |
phonemacro | 8:b2d4c71268aa | 159 | ds1775_raw_data raw; |
phonemacro | 8:b2d4c71268aa | 160 | raw.uwrd = 0; |
phonemacro | 8:b2d4c71268aa | 161 | if (temperature < 0) { |
phonemacro | 8:b2d4c71268aa | 162 | raw.sign_bit = 1; |
phonemacro | 8:b2d4c71268aa | 163 | temperature = -temperature; |
phonemacro | 8:b2d4c71268aa | 164 | } |
phonemacro | 8:b2d4c71268aa | 165 | if (ds1775_extended_format) |
phonemacro | 8:b2d4c71268aa | 166 | temperature /= DS1775_CF_EXTENDED_FORMAT; |
phonemacro | 8:b2d4c71268aa | 167 | else |
phonemacro | 8:b2d4c71268aa | 168 | temperature /= DS1775_CF_NORMAL_FORMAT; |
phonemacro | 8:b2d4c71268aa | 169 | raw.magnitude_bits = uint16_t(temperature); |
phonemacro | 8:b2d4c71268aa | 170 | return ds1775_write_reg(raw.uwrd, DS1775_REG_THYST_LOW_TRIP, i2c_bus); |
phonemacro | 8:b2d4c71268aa | 171 | } |
phonemacro | 8:b2d4c71268aa | 172 | |
phonemacro | 8:b2d4c71268aa | 173 | |
phonemacro | 8:b2d4c71268aa | 174 | int ds1775_write_trip_high(float temperature, I2C &i2c_bus) |
phonemacro | 8:b2d4c71268aa | 175 | { |
phonemacro | 8:b2d4c71268aa | 176 | ds1775_raw_data raw; |
phonemacro | 8:b2d4c71268aa | 177 | raw.uwrd = 0; |
phonemacro | 8:b2d4c71268aa | 178 | if (temperature < 0) { |
phonemacro | 8:b2d4c71268aa | 179 | raw.sign_bit = 1; |
phonemacro | 8:b2d4c71268aa | 180 | temperature = -temperature; |
phonemacro | 8:b2d4c71268aa | 181 | } |
phonemacro | 8:b2d4c71268aa | 182 | if (ds1775_extended_format) |
phonemacro | 8:b2d4c71268aa | 183 | temperature /= DS1775_CF_EXTENDED_FORMAT; |
phonemacro | 8:b2d4c71268aa | 184 | else |
phonemacro | 8:b2d4c71268aa | 185 | temperature /= DS1775_CF_NORMAL_FORMAT; |
phonemacro | 8:b2d4c71268aa | 186 | raw.magnitude_bits = uint16_t(temperature); |
phonemacro | 8:b2d4c71268aa | 187 | return ds1775_write_reg(raw.uwrd, DS1775_REG_TOS_HIGH_TRIP, i2c_bus); |
phonemacro | 8:b2d4c71268aa | 188 | } |
phonemacro | 8:b2d4c71268aa | 189 | |
phonemacro | 8:b2d4c71268aa | 190 | |
phonemacro | 8:b2d4c71268aa | 191 | float ds1775_celsius_to_fahrenheit(float temp_c) |
phonemacro | 8:b2d4c71268aa | 192 | { |
phonemacro | 8:b2d4c71268aa | 193 | float temp_f; |
phonemacro | 8:b2d4c71268aa | 194 | temp_f = ((temp_c * 9)/5) + 32; |
phonemacro | 8:b2d4c71268aa | 195 | return temp_f; |
phonemacro | 8:b2d4c71268aa | 196 | } |