ds2480b.h

DS2480芯片是实现1-wire协议的芯片。本驱动使用C8051F206单片机与DS2480芯片进行交互

// definitions

// Mode Commands
#define MODE_DATA                      0xE1
#define MODE_COMMAND                   0xE3
#define MODE_STOP_PULSE                0xF1

// Return byte value
#define RB_CHIPID_MASK                 0x1C
#define RB_RESET_MASK                  0x03
#define RB_1WIRESHORT                  0x00
#define RB_PRESENCE                    0x01
#define RB_ALARMPRESENCE               0x02
#define RB_NOPRESENCE                  0x03

#define RB_BIT_MASK                    0x03
#define RB_BIT_ONE                     0x03
#define RB_BIT_ZERO                    0x00

// Masks for all bit ranges
#define CMD_MASK                       0x80
#define FUNCTSEL_MASK                  0x60
#define BITPOL_MASK                    0x10
#define SPEEDSEL_MASK                  0x0C
#define MODSEL_MASK                    0x02
#define PARMSEL_MASK                   0x70
#define PARMSET_MASK                   0x0E

// Command or config bit
#define CMD_COMM                       0x81
#define CMD_CONFIG                     0x01

// Function select bits
#define FUNCTSEL_BIT                   0x00
#define FUNCTSEL_SEARCHON              0x30
#define FUNCTSEL_SEARCHOFF             0x20
#define FUNCTSEL_RESET                 0x40
#define FUNCTSEL_CHMOD                 0x60

// Bit polarity/Pulse voltage bits
#define BITPOL_ONE                     0x10
#define BITPOL_ZERO                    0x00
#define BITPOL_5V                      0x00
#define BITPOL_12V                     0x10

// One Wire speed bits
#define SPEEDSEL_STD                   0x00
#define SPEEDSEL_FLEX                  0x04
#define SPEEDSEL_OD                    0x08
#define SPEEDSEL_PULSE                 0x0C

// Data/Command mode select bits
#define MODSEL_DATA                    0x00
#define MODSEL_COMMAND                 0x02

// 5V Follow Pulse select bits 
#define PRIME5V_TRUE                   0x02
#define PRIME5V_FALSE                  0x00

// Parameter select bits
#define PARMSEL_PARMREAD               0x00
#define PARMSEL_SLEW                   0x10
#define PARMSEL_12VPULSE               0x20
#define PARMSEL_5VPULSE                0x30
#define PARMSEL_WRITE1LOW              0x40
#define PARMSEL_SAMPLEOFFSET           0x50
#define PARMSEL_ACTIVEPULLUPTIME       0x60
#define PARMSEL_BAUDRATE               0x70

// Pull down slew rate.
#define PARMSET_Slew15Vus              0x00
#define PARMSET_Slew2p2Vus             0x02
#define PARMSET_Slew1p65Vus            0x04
#define PARMSET_Slew1p37Vus            0x06
#define PARMSET_Slew1p1Vus             0x08
#define PARMSET_Slew0p83Vus            0x0A
#define PARMSET_Slew0p7Vus             0x0C
#define PARMSET_Slew0p55Vus            0x0E

// 12V programming pulse time table
#define PARMSET_32us                   0x00
#define PARMSET_64us                   0x02
#define PARMSET_128us                  0x04
#define PARMSET_256us                  0x06
#define PARMSET_512us                  0x08
#define PARMSET_1024us                 0x0A
#define PARMSET_2048us                 0x0C
#define PARMSET_infinite               0x0E

// 5V strong pull up pulse time table
#define PARMSET_16p4ms                 0x00
#define PARMSET_65p5ms                 0x02
#define PARMSET_131ms                  0x04
#define PARMSET_262ms                  0x06
#define PARMSET_524ms                  0x08
#define PARMSET_1p05s                  0x0A
#define PARMSET_dynamic                0x0C
#define PARMSET_infinite               0x0E

// Write 1 low time
#define PARMSET_Write8us               0x00
#define PARMSET_Write9us               0x02
#define PARMSET_Write10us              0x04
#define PARMSET_Write11us              0x06
#define PARMSET_Write12us              0x08
#define PARMSET_Write13us              0x0A
#define PARMSET_Write14us              0x0C
#define PARMSET_Write15us              0x0E

// Data sample offset and Write 0 recovery time
#define PARMSET_SampOff3us             0x00
#define PARMSET_SampOff4us             0x02
#define PARMSET_SampOff5us             0x04
#define PARMSET_SampOff6us             0x06
#define PARMSET_SampOff7us             0x08
#define PARMSET_SampOff8us             0x0A
#define PARMSET_SampOff9us             0x0C
#define PARMSET_SampOff10us            0x0E

// Active pull up on time
#define PARMSET_PullUp0p0us            0x00
#define PARMSET_PullUp0p5us            0x02
#define PARMSET_PullUp1p0us            0x04
#define PARMSET_PullUp1p5us            0x06
#define PARMSET_PullUp2p0us            0x08
#define PARMSET_PullUp2p5us            0x0A
#define PARMSET_PullUp3p0us            0x0C
#define PARMSET_PullUp3p5us            0x0E

// Baud rate bits
#define PARMSET_9600                   0x00
#define PARMSET_19200                  0x02
#define PARMSET_57600                  0x04
#define PARMSET_115200                 0x06

// DS2480B program voltage available
#define DS2480BPROG_MASK                0x20

// mode bit flags
#define MODE_NORMAL                    0x00
#define MODE_OVERDRIVE                 0x01
#define MODE_STRONG5                   0x02
#define MODE_PROGRAM                   0x04
#define MODE_BREAK                     0x08

#define MAX_BAUD                       PARMSET_115200