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); } }
devices/ds18b20.h
- Committer:
- ivank
- Date:
- 2012-12-18
- Revision:
- 3:7bd102cb73e0
- Parent:
- 2:07da4deb7135
File content as of revision 3:7bd102cb73e0:
/* Copyright (c) 2012, Ivan Kravets <me@ikravets.com>, www.ikravets.com. MIT License * * 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 THE AUTHORS OR COPYRIGHT HOLDERS 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. */ #ifndef DS18B20_H #define DS18B20_H #include "OneWireDeviceTemperature.h" // Device resolution #define OWTEMP_9_BIT 0x1F // 9 bit #define OWTEMP_10_BIT 0x3F // 10 bit #define OWTEMP_11_BIT 0x5F // 11 bit #define OWTEMP_12_BIT 0x7F // 12 bit class OneWireDeviceDS18B20 : public OneWireDeviceTemperature { public: OneWireDeviceDS18B20(OneWire* ow, DeviceAddress address) : OneWireDeviceTemperature(ow, address) {}; virtual void sendSetCommand(OneWireDeviceCmd cmd, uint8_t data); virtual float sendGetCommand(OneWireDeviceCmd cmd); private: typedef uint8_t ScratchPad[9]; ScratchPad scratchPad; void setResolution(uint8_t res); void readScratchPad(); void writeScratchPad(); float getTemperature(void); }; #endif