onewire.c File Reference

1 wire protocol functions. Target: PIC16F876 More...

#include <app.h>

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Macros
#define	PWR_ON_PIN   RA1
	RA.1 - power to DS2401. More...
#define	PWR_ON_DIR   TRISA1
#define	ID_DQ_PIN   RB0
	RB.0 - DQ for DS2401. More...
#define	ID_DQ_DIR   TRISB0
#define	OneWire_PinHI()   TRISB0 = DIR_IN
#define	OneWire_PinLO()   { RB0 = 0x00; TRISB0 = DIR_OUT; }
#define	W_CELL   4
#define	W_INIT   50
#define	W_WAIT   2000

Functions
BYTE	OneWire_GetID (BYTE *buff)
BYTE	OneWire_Init (void)
BYTE	OneWire_Read (void)
void	OneWire_Write (BYTE d)
BYTE	OneWire_Crc8 (BYTE Data, BYTE Accum)

Detailed Description

1 wire protocol functions. Target: PIC16F876

This file is part of JADEKU Portable ADQ device for Routines Control.

Copyright (C) 2002-2009, Hernan Monserrat hemonserrat<at>gmail<dot>com

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file onewire.c.

Macro Definition Documentation

ID_DQ_DIR

#define ID_DQ_DIR   TRISB0

Definition at line 29 of file onewire.c.

ID_DQ_PIN

#define ID_DQ_PIN   RB0

RB.0 - DQ for DS2401.

Definition at line 28 of file onewire.c.

OneWire_PinHI

#define OneWire_PinHI

(

)

TRISB0 = DIR_IN

Definition at line 31 of file onewire.c.

OneWire_PinLO

#define OneWire_PinLO

(

)

{ RB0 = 0x00; TRISB0 = DIR_OUT; }

Definition at line 32 of file onewire.c.

PWR_ON_DIR

#define PWR_ON_DIR   TRISA1

Definition at line 26 of file onewire.c.

PWR_ON_PIN

#define PWR_ON_PIN   RA1

RA.1 - power to DS2401.

Definition at line 25 of file onewire.c.

W_CELL

#define W_CELL   4

Definition at line 33 of file onewire.c.

W_INIT

#define W_INIT   50

Definition at line 34 of file onewire.c.

W_WAIT

#define W_WAIT   2000

Definition at line 35 of file onewire.c.

Function Documentation

OneWire_Crc8()

BYTE OneWire_Crc8	(	BYTE	Data,
		BYTE	Accum
	)

Computes CRC8.

Parameters

Data	- data byte to compute.
Accum	- accumulated result.

Returns

the CRC8 accumulated result based on the params.

Definition at line 154 of file onewire.c.

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OneWire_GetID()

BYTE OneWire_GetID

(

BYTE *

buff

)

Test for the 1 wire device presence, read ROM code and calculates crc.

Parameters

buff	- buffer to store read data.

Returns

TRUE on packet received, FALSE timeout.

Remarks

note that 8-byte ID is returned in array buff.

Definition at line 43 of file onewire.c.

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OneWire_Init()

BYTE OneWire_Init

(

void

)

Send initialization flags to the 1 wire network.

Returns

TRUE on device presence.

Definition at line 69 of file onewire.c.

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OneWire_Read()

BYTE OneWire_Read

(

void

)

Read a byte from the 1 wire network.

Returns

byte read.

Definition at line 93 of file onewire.c.

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OneWire_Write()

void OneWire_Write

(

BYTE

d

)

Send a byte to the 1 wire network.

Parameters

d	- data byte to send.

Returns

none.

Definition at line 124 of file onewire.c.

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