onewirei.h

Wind sensor for control speed air flow.

#ifndef _ONEWIREI_H
#define _ONEWIREI_H

#define     CPU_FREQUENCY   7.3728
#define     OWI_USE_INTERNAL_PULLUP
#define     OWI_PORT        PORTD   //!< 1-Wire PORT Data register.
#define     OWI_PIN         PIND    //!< 1-Wire Input pin register.
#define     OWI_DDR         DDRD    //!< 1-Wire Data direction register.
#define     OWI_PIN_0       0x01
#define     OWI_PIN_1       0x02
#define     OWI_PIN_2       0x04
#define     OWI_PIN_3       0x08
#define     OWI_PIN_4       0x10
#define     OWI_PIN_5       0x20
#define     OWI_PIN_6       0x40
#define     OWI_PIN_7       0x80
/****************************************************************************
 ROM commands
****************************************************************************/
#define     OWI_ROM_READ    0x33    //!< READ ROM command code.
#define     OWI_ROM_SKIP    0xcc    //!< SKIP ROM command code.
#define     OWI_ROM_MATCH   0x55    //!< MATCH ROM command code.
#define     OWI_ROM_SEARCH  0xf0    //!< SEARCH ROM command code.
/****************************************************************************
 Return codes
****************************************************************************/
#define     OWI_ROM_SEARCH_FINISHED     0x00    //!< Search finished return code.
#define     OWI_ROM_SEARCH_FAILED       0xff    //!< Search failed return code.
#define     OWI_CRC_OK      0x00    //!< CRC check succeded
#define     OWI_CRC_ERROR   0x01    //!< CRC check failed
/*****************************************************************************
 Timing parameters
*****************************************************************************/
#define     OWI_DELAY_OFFSET_CYCLES    13   //!< Timing delay when pulling bus low and releasing bus.
// Bit timing delays in clock cycles (= us*clock freq in MHz).
#define     OWI_DELAY_A_STD_MODE    ((6   * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_B_STD_MODE    ((64  * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_C_STD_MODE    ((60  * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_D_STD_MODE    ((10  * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_E_STD_MODE    ((9   * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_F_STD_MODE    ((55  * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
//#define     OWI_DELAY_G_STD_MODE    ((0   * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_H_STD_MODE    ((480 * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_I_STD_MODE    ((70  * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
#define     OWI_DELAY_J_STD_MODE    ((410 * CPU_FREQUENCY) - OWI_DELAY_OFFSET_CYCLES)
//======================================================================================
#define DS1820_FAMILY_ID                0x10 
#define DS1820_START_CONVERSION         0x44
#define DS1820_READ_SCRATCHPAD          0xbe
#define DS1820_ERROR                    -1000   // Return code. Outside temperature range.
#define DS2890_FAMILY_ID                0x2c
#define DS2890_WRITE_CONTROL_REGISTER   0X55
#define DS2890_RELEASE_CODE             0x96
#define DS2890_WRITE_POSITION           0x0f
#define SEARCH_SUCCESSFUL               0x00
#define SEARCH_CRC_ERROR                0x01
#define OWI_PULL_BUS_LOW(bitMask) \
        OWI_DDR |= bitMask; \
        OWI_PORT &= ~bitMask;
#ifdef OWI_USE_INTERNAL_PULLUP            
// Set 1-Wire pin(s) to input and enable internal pull-up resistor.
#define OWI_RELEASE_BUS(bitMask) \
        OWI_DDR &= ~bitMask; \
        OWI_PORT |= bitMask; 
#else
// Set 1-Wire pin(s) to input mode. No internal pull-up enabled.
#define OWI_RELEASE_BUS(bitMask) \
        OWI_DDR &= ~bitMask; \
        OWI_PORT &= ~bitMask;
#endif
//=========================================
void OWI_WriteBit1(unsigned char pins);
void OWI_WriteBit0(unsigned char pins);
unsigned char OWI_ReadBit(unsigned char pins);
unsigned char OWI_DetectPresence(unsigned char pins);
void OWI_SendByte(unsigned char data, unsigned char pins);
unsigned char OWI_ReceiveByte(unsigned char pin);
void OWI_SkipRom(unsigned char pins);
void OWI_ReadRom(unsigned char * romValue, unsigned char pin);
void OWI_MatchRom(unsigned char * romValue, unsigned char pins);
unsigned char OWI_SearchRom(unsigned char * bitPattern, unsigned char lastDeviation, unsigned char pin);
unsigned char OWI_ComputeCRC8(unsigned char inData, unsigned char seed);
unsigned int OWI_ComputeCRC16(unsigned char inData, unsigned int seed);
unsigned char OWI_CheckRomCRC(unsigned char * romValue);
extern void OWI_Init(unsigned char pins);
#endif