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1 #ifndef ONEWIRE_H_ |
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2 #define ONEWIRE_H_ |
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3 |
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4 #ifdef __cplusplus |
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5 extern "C" { |
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6 #endif |
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7 |
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8 #include <stdint.h> |
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9 |
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10 /*******************************************/ |
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11 /* Hardware connection */ |
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12 /*******************************************/ |
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13 |
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14 /* Define OW_ONE_BUS if only one 1-Wire-Bus is used |
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15 in the application -> shorter code. |
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16 If not defined make sure to call ow_set_bus() before using |
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17 a bus. Runtime bus-select increases code size by around 300 |
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18 bytes so use OW_ONE_BUS if possible */ |
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19 #define OW_ONE_BUS |
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20 |
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21 #ifdef OW_ONE_BUS |
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22 |
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23 #define OW_PIN PB1 |
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24 #define OW_IN PINB |
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25 #define OW_OUT PORTB |
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26 #define OW_DDR DDRB |
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27 #define OW_CONF_DELAYOFFSET 0 |
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28 |
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29 #else |
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30 #if ( F_CPU < 1843200 ) |
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31 #warning | Experimental multi-bus-mode is not tested for |
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32 #warning | frequencies below 1,84MHz. Use OW_ONE_WIRE or |
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33 #warning | faster clock-source (i.e. internal 2MHz R/C-Osc.). |
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34 #endif |
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35 #define OW_CONF_CYCLESPERACCESS 13 |
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36 #define OW_CONF_DELAYOFFSET ( (uint16_t)( ((OW_CONF_CYCLESPERACCESS) * 1000000L) / F_CPU ) ) |
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37 #endif |
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38 |
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39 // Recovery time (T_Rec) minimum 1usec - increase for long lines |
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40 // 5 usecs is a value give in some Maxim AppNotes |
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41 // 30u secs seem to be reliable for longer lines |
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42 //#define OW_RECOVERY_TIME 5 /* usec */ |
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43 //#define OW_RECOVERY_TIME 300 /* usec */ |
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44 #define OW_RECOVERY_TIME 10 /* usec */ |
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45 |
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46 // Use AVR's internal pull-up resistor instead of external 4,7k resistor. |
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47 // Based on information from Sascha Schade. Experimental but worked in tests |
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48 // with one DS18B20 and one DS18S20 on a rather short bus (60cm), where both |
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49 // sensores have been parasite-powered. |
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50 #define OW_USE_INTERNAL_PULLUP 1 /* 0=external, 1=internal */ |
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51 |
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52 /*******************************************/ |
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53 |
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54 |
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55 #define OW_MATCH_ROM 0x55 |
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56 #define OW_SKIP_ROM 0xCC |
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57 #define OW_SEARCH_ROM 0xF0 |
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58 |
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59 #define OW_SEARCH_FIRST 0xFF // start new search |
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60 #define OW_PRESENCE_ERR 0xFF |
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61 #define OW_DATA_ERR 0xFE |
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62 #define OW_LAST_DEVICE 0x00 // last device found |
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63 |
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64 // rom-code size including CRC |
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65 #define OW_ROMCODE_SIZE 8 |
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66 |
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67 extern uint8_t ow_reset(void); |
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68 |
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69 extern uint8_t ow_bit_io( uint8_t b ); |
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70 extern uint8_t ow_byte_wr( uint8_t b ); |
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71 extern uint8_t ow_byte_rd( void ); |
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72 |
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73 extern uint8_t ow_rom_search( uint8_t diff, uint8_t *id ); |
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74 |
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75 extern void ow_command( uint8_t command, uint8_t *id ); |
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76 extern void ow_command_with_parasite_enable( uint8_t command, uint8_t *id ); |
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77 |
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78 extern void ow_parasite_enable( void ); |
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79 extern void ow_parasite_disable( void ); |
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80 extern uint8_t ow_input_pin_state( void ); |
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81 |
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82 #ifndef OW_ONE_BUS |
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83 extern void ow_set_bus( volatile uint8_t* in, |
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84 volatile uint8_t* out, |
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85 volatile uint8_t* ddr, |
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86 uint8_t pin ); |
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87 #endif |
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88 |
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89 #ifdef __cplusplus |
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90 } |
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91 #endif |
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92 |
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93 #endif |
