94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
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#ifndef ONEWIRE_H_
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#define ONEWIRE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/*******************************************/
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/* Hardware connection */
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/*******************************************/
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/* Define OW_ONE_BUS if only one 1-Wire-Bus is used
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in the application -> shorter code.
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If not defined make sure to call ow_set_bus() before using
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a bus. Runtime bus-select increases code size by around 300
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bytes so use OW_ONE_BUS if possible */
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// #define OW_ONE_BUS
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#ifdef OW_ONE_BUS
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#define OW_PIN PD6
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#define OW_IN PIND
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#define OW_OUT PORTD
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#define OW_DDR DDRD
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#define OW_CONF_DELAYOFFSET 0
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#else
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#if ( F_CPU < 1843200 )
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#warning | Experimental multi-bus-mode is not tested for
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#warning | frequencies below 1,84MHz. Use OW_ONE_WIRE or
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#warning | faster clock-source (i.e. internal 2MHz R/C-Osc.).
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#endif
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#define OW_CONF_CYCLESPERACCESS 13
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#define OW_CONF_DELAYOFFSET ( (uint16_t)( ((OW_CONF_CYCLESPERACCESS) * 1000000L) / F_CPU ) )
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#endif
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// Recovery time (T_Rec) minimum 1usec - increase for long lines
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// 5 usecs is a value give in some Maxim AppNotes
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// 30u secs seem to be reliable for longer lines
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//#define OW_RECOVERY_TIME 5 /* usec */
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//#define OW_RECOVERY_TIME 300 /* usec */
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#define OW_RECOVERY_TIME 10 /* usec */
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// Use AVR's internal pull-up resistor instead of external 4,7k resistor.
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// Based on information from Sascha Schade. Experimental but worked in tests
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// with one DS18B20 and one DS18S20 on a rather short bus (60cm), where both
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// sensores have been parasite-powered.
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#define OW_USE_INTERNAL_PULLUP 1 /* 0=external, 1=internal */
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/*******************************************/
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#define OW_MATCH_ROM 0x55
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#define OW_SKIP_ROM 0xCC
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#define OW_SEARCH_ROM 0xF0
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#define OW_SEARCH_FIRST 0xFF // start new search
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#define OW_PRESENCE_ERR 0xFF
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#define OW_DATA_ERR 0xFE
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#define OW_LAST_DEVICE 0x00 // last device found
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// rom-code size including CRC
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#define OW_ROMCODE_SIZE 8
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extern uint8_t ow_reset(void);
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extern uint8_t ow_bit_io( uint8_t b );
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extern uint8_t ow_byte_wr( uint8_t b );
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extern uint8_t ow_byte_rd( void );
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extern uint8_t ow_rom_search( uint8_t diff, uint8_t *id );
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extern void ow_command( uint8_t command, uint8_t *id );
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extern void ow_command_with_parasite_enable( uint8_t command, uint8_t *id );
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extern void ow_parasite_enable( void );
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extern void ow_parasite_disable( void );
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extern uint8_t ow_input_pin_state( void );
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#ifndef OW_ONE_BUS
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extern void ow_set_bus( volatile uint8_t* in,
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volatile uint8_t* out,
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volatile uint8_t* ddr,
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uint8_t pin );
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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