OneWire Library lets you access 1-wire devices made by Maxim/Dallas, such as temperature sensors
Dependents: OneWireTest mbed_blinky Affich_Lum_Moist Projetv0 ... more
#include "mbed.h" #include "OneWire.h" OneWire owBus(p21); int main() { char _id[16]; DeviceAddresses* devAddresses = owBus.getFoundDevAddresses(); uint8_t foundNum = owBus.getFoundDevNum(); printf("OneWire: found %d devices\r\n", foundNum); while(1) { OneWireDeviceTemperature::startConversationForAll(&owBus, OWTEMP_11_BIT); for (uint8_t i = 0; i < foundNum; i++) { OneWireDevice* owDevice = OneWireDeviceFactory::init(&owBus, (*devAddresses)[i]); if (owDevice->getFamily() != ONEWIRE_DS18B20_FAMILY) // currently only DS18B20 supports continue; owDevice->generateId(_id); printf("OneWire: device #%s = %.4f*C\r\n", _id, (float) owDevice->sendGetCommand(GET_TEMPERATURE)); delete owDevice; } wait(5); } }
_headers/OneWire.h@3:7bd102cb73e0, 2012-12-18 (annotated)
- Committer:
- ivank
- Date:
- Tue Dec 18 12:12:21 2012 +0000
- Revision:
- 3:7bd102cb73e0
- Parent:
- OneWire.h@2:07da4deb7135
- moved .h files to '_headers' folders; - added MIT License to all files
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ivank | 3:7bd102cb73e0 | 1 | /* Copyright (c) 2012, Ivan Kravets <me@ikravets.com>, www.ikravets.com. MIT License |
ivank | 3:7bd102cb73e0 | 2 | * |
ivank | 3:7bd102cb73e0 | 3 | * Permission is hereby granted, free of charge, to any person obtaining a copy of this software |
ivank | 3:7bd102cb73e0 | 4 | * and associated documentation files (the "Software"), to deal in the Software without restriction, |
ivank | 3:7bd102cb73e0 | 5 | * including without limitation the rights to use, copy, modify, merge, publish, distribute, |
ivank | 3:7bd102cb73e0 | 6 | * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is |
ivank | 3:7bd102cb73e0 | 7 | * furnished to do so, subject to the following conditions: |
ivank | 3:7bd102cb73e0 | 8 | * |
ivank | 3:7bd102cb73e0 | 9 | * The above copyright notice and this permission notice shall be included in all copies or |
ivank | 3:7bd102cb73e0 | 10 | * substantial portions of the Software. |
ivank | 3:7bd102cb73e0 | 11 | * |
ivank | 3:7bd102cb73e0 | 12 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
ivank | 3:7bd102cb73e0 | 13 | * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
ivank | 3:7bd102cb73e0 | 14 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
ivank | 3:7bd102cb73e0 | 15 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
ivank | 3:7bd102cb73e0 | 16 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
ivank | 3:7bd102cb73e0 | 17 | */ |
ivank | 3:7bd102cb73e0 | 18 | |
ivank | 0:b9cd1d4dcc1f | 19 | #ifndef ONEWIRE_H |
ivank | 0:b9cd1d4dcc1f | 20 | #define ONEWIRE_H |
ivank | 0:b9cd1d4dcc1f | 21 | |
ivank | 0:b9cd1d4dcc1f | 22 | #include "mbed.h" |
ivank | 0:b9cd1d4dcc1f | 23 | |
ivank | 0:b9cd1d4dcc1f | 24 | #define FALSE 0 |
ivank | 0:b9cd1d4dcc1f | 25 | #define TRUE 1 |
ivank | 0:b9cd1d4dcc1f | 26 | |
ivank | 0:b9cd1d4dcc1f | 27 | #define ONEWIRE_DS18B20_FAMILY 0x28 |
ivank | 0:b9cd1d4dcc1f | 28 | |
ivank | 0:b9cd1d4dcc1f | 29 | enum OneWireDeviceCmd { |
ivank | 0:b9cd1d4dcc1f | 30 | SET_TEMPERATURE_RESOLUTION = 0, |
ivank | 0:b9cd1d4dcc1f | 31 | GET_TEMPERATURE |
ivank | 0:b9cd1d4dcc1f | 32 | }; |
ivank | 0:b9cd1d4dcc1f | 33 | |
ivank | 0:b9cd1d4dcc1f | 34 | typedef uint8_t DeviceAddress[8]; |
ivank | 0:b9cd1d4dcc1f | 35 | typedef DeviceAddress* DeviceAddresses; |
ivank | 0:b9cd1d4dcc1f | 36 | |
ivank | 0:b9cd1d4dcc1f | 37 | class OneWire { |
ivank | 0:b9cd1d4dcc1f | 38 | public: |
ivank | 0:b9cd1d4dcc1f | 39 | OneWire(PinName pin); |
ivank | 0:b9cd1d4dcc1f | 40 | |
ivank | 0:b9cd1d4dcc1f | 41 | uint8_t reset(void); |
ivank | 0:b9cd1d4dcc1f | 42 | uint8_t readByte(void); |
ivank | 0:b9cd1d4dcc1f | 43 | void writeByte(uint8_t val); |
ivank | 0:b9cd1d4dcc1f | 44 | void select(uint8_t* devAddr); |
ivank | 0:b9cd1d4dcc1f | 45 | void resetSearch(void); |
ivank | 0:b9cd1d4dcc1f | 46 | |
ivank | 0:b9cd1d4dcc1f | 47 | uint8_t search(uint8_t* devAddr); |
ivank | 0:b9cd1d4dcc1f | 48 | void sendGlobalCommand(uint8_t); |
ivank | 0:b9cd1d4dcc1f | 49 | DeviceAddresses* getFoundDevAddresses(); |
ivank | 0:b9cd1d4dcc1f | 50 | uint8_t getFoundDevNum(); |
ivank | 0:b9cd1d4dcc1f | 51 | |
ivank | 0:b9cd1d4dcc1f | 52 | private: |
ivank | 0:b9cd1d4dcc1f | 53 | DigitalInOut DIO; |
ivank | 0:b9cd1d4dcc1f | 54 | static const uint8_t dscrc_table[]; |
ivank | 0:b9cd1d4dcc1f | 55 | |
ivank | 0:b9cd1d4dcc1f | 56 | DeviceAddresses* foundDevAdresses; |
ivank | 0:b9cd1d4dcc1f | 57 | uint8_t foundDevNum; |
ivank | 0:b9cd1d4dcc1f | 58 | |
ivank | 0:b9cd1d4dcc1f | 59 | uint8_t lastDiscrep; |
ivank | 0:b9cd1d4dcc1f | 60 | uint8_t doneFlag; |
ivank | 0:b9cd1d4dcc1f | 61 | uint8_t dowcrc; |
ivank | 0:b9cd1d4dcc1f | 62 | |
ivank | 0:b9cd1d4dcc1f | 63 | uint8_t readBit(void); |
ivank | 0:b9cd1d4dcc1f | 64 | void writeBit(uint8_t bitval); |
ivank | 0:b9cd1d4dcc1f | 65 | |
ivank | 0:b9cd1d4dcc1f | 66 | void skip(); |
ivank | 0:b9cd1d4dcc1f | 67 | uint8_t calcCRC(uint8_t x); |
ivank | 0:b9cd1d4dcc1f | 68 | void findDevAddresses(void); |
ivank | 0:b9cd1d4dcc1f | 69 | }; |
ivank | 0:b9cd1d4dcc1f | 70 | |
ivank | 2:07da4deb7135 | 71 | #include "OneWireDevice.h" |
ivank | 0:b9cd1d4dcc1f | 72 | |
ivank | 0:b9cd1d4dcc1f | 73 | #endif |