Rob Dobson / Onewire

Library to communicate with Maxim OneWire protocol devices Modified timings and IRQ overrides

Dependents:   RdGasUseMonitor

Fork of Onewire by Simon Barker

Onewire.h@8:5d0bd95b586f, 2015-10-16 (annotated)

Committer:
Bobty
Date:
Fri Oct 16 06:25:11 2015 +0000
Revision:
8:5d0bd95b586f
Parent:
7:0a87f8c2d9e6 
Changed timings to be consistent with Arduino onewire library https://github.com/PaulStoffregen/OneWire

Who changed what in which revision?

UserRevisionLine numberNew contents of line
simonbarker 0:d961f715d82b 1 #ifndef Onewire_h
simonbarker 0:d961f715d82b 2 #define Onewire_h
simonbarker 0:d961f715d82b 3
simonbarker 0:d961f715d82b 4 #include "mbed.h"
simonbarker 0:d961f715d82b 5
Bobty 4:b678c7c8203c 6 #define ONEWIRE_ADDR_BYTES 8
Bobty 4:b678c7c8203c 7
Bobty 6:d2452e9b169b 8 const int ONEWIRE_OK = 0;
Bobty 8:5d0bd95b586f 9 const int ONEWIRE_FAIL_STUCK_LOW = 1;
Bobty 8:5d0bd95b586f 10 const int ONEWIRE_SEARCH_ALL_DONE = 2;
Bobty 8:5d0bd95b586f 11 const int ONEWIRE_SEARCH_INIT_FAIL = 3;
Bobty 8:5d0bd95b586f 12 const int ONEWIRE_SEARCH_NOT_FOUND = 4;
Bobty 7:0a87f8c2d9e6 13 const int ONEWIRE_SEARCH_COMP_BIT_ERR = 5;
simonbarker 0:d961f715d82b 14
Bobty 6:d2452e9b169b 15 class Onewire
Bobty 6:d2452e9b169b 16 {
Bobty 6:d2452e9b169b 17
Bobty 6:d2452e9b169b 18 public:
Bobty 1:8e9464e05ddf 19 Onewire(PinName oneBus);
Bobty 1:8e9464e05ddf 20 void writeBit(int bit);
simonbarker 0:d961f715d82b 21 int readBit();
simonbarker 0:d961f715d82b 22 int init();
simonbarker 0:d961f715d82b 23 int readByte();
simonbarker 0:d961f715d82b 24 void writeByte(char data);
simonbarker 0:d961f715d82b 25 unsigned char CRC(unsigned char* addr, unsigned char len);
Bobty 7:0a87f8c2d9e6 26 char* GetErrorStr(int errCode);
simonbarker 0:d961f715d82b 27
Bobty 1:8e9464e05ddf 28 // Clear the search state so that if will start from the beginning again.
Bobty 1:8e9464e05ddf 29 void reset_search();
Bobty 6:d2452e9b169b 30 // Look for the next device.
Bobty 6:d2452e9b169b 31 // Returns
Bobty 6:d2452e9b169b 32 // ONEWIRE_OK if a new address has been returned.
Bobty 6:d2452e9b169b 33 // ONEWIRE_SEARCH_ALL_DONE = all devices found
Bobty 6:d2452e9b169b 34 // ONEWIRE_SEARCH_INIT_FAIL = failed to init
Bobty 6:d2452e9b169b 35 // ONEWIRE_SEARCH_NOT_FOUND = no devices found
Bobty 6:d2452e9b169b 36 // It might be a good idea to check the CRC to make sure you didn't
Bobty 1:8e9464e05ddf 37 // get garbage. The order is deterministic. You will always get
Bobty 1:8e9464e05ddf 38 // the same devices in the same order.
Bobty 1:8e9464e05ddf 39 uint8_t search(uint8_t *newAddr);
Bobty 1:8e9464e05ddf 40
simonbarker 0:d961f715d82b 41 private:
Bobty 1:8e9464e05ddf 42 DigitalInOut oneBus_;
Bobty 1:8e9464e05ddf 43
Bobty 1:8e9464e05ddf 44 // search state
Bobty 1:8e9464e05ddf 45 unsigned char _search_ROM_NO[8];
Bobty 1:8e9464e05ddf 46 uint8_t _search_LastDiscrepancy;
Bobty 1:8e9464e05ddf 47 uint8_t _search_LastFamilyDiscrepancy;
Bobty 1:8e9464e05ddf 48 uint8_t _search_LastDeviceFlag;
simonbarker 0:d961f715d82b 49 };
simonbarker 0:d961f715d82b 50 #endif