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:
- 2:07da4deb7135
- Parent:
- 0:b9cd1d4dcc1f
- Child:
- 3:7bd102cb73e0
File content as of revision 2:07da4deb7135:
#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