ds2450.h

avr cpu 库源代码 对avr单片机编程很有帮助

//*****************************************************************************
// File Name	: ds2450.c
// Title		: Dallas 1-Wire DS2450 A2D Sensor Library
// Revision		: 5
// Notes		: 
// Target MCU	: Atmel AVR series
// Editor Tabs	: 4
// 
// Revision History:
// When			Who			Rev		Description of change
// -----------	-----------	-------	-----------------------
// 07-Aug-2006	pwilliams	6		Fixed Error in strupr usage causing stack corruption
// 01-Oct-2003	rwatson		5		Fixed result error with MSB
// 30-Sep-2003	rwatson		4		CreatedDigitalOut
// 30-Sep-2003	rwatson		3		Created SetupAlll, StartAll, ResultAll, StartAndResultAll
// 29-Sep-2003	rwatson		2		Created Setup, Start, Result, StartAndResult
// 29-Sep-2003	rwatson		1		Created the program structure
//*****************************************************************************

#ifndef ds2450_h
#define ds2450_h

//----- Include Files ---------------------------------------------------------
#include "global.h"

//----- Defines ---------------------------------------------------------------
#define ds2450_rev					6

// the two voltage ranges
#define DS2450_RANGE_2V				0x00    // 0-2.55V
#define DS2450_RANGE_5V				0x01    // 0-5.10V

// the family code
#define DS2450_FAMILY				0x20

// the starting addresses
// of the pages in RAM
#define DS2450_DATA_PAGE			0x00
#define DS2450_SETUP_PAGE			0x08
#define DS2450_ALARM_PAGE			0x10

#define DS2450_VCC_FLAG				0x40
#define DS2450_VCC_ADDR				0x1C

// maximum allowable resolution
#define DS2450_RES_MAX				16

// function commands
#define DS2450_READ_MEMORY			0xAA
#define DS2450_WRITE_MEMORY			0x55
#define DS2450_CONVERT				0x3C
#define DS2450_CONVERT_ALL4_MASK	0x0F
#define DS2450_CLEAR_ALL4_MASK		0x55

//----- Typedefs --------------------------------------------------------------

// enumerated constant for configuring
// and controlling an A2D channel as a digital output
typedef enum {DIGOUT_LOW=0x80, DIGOUT_OC=0xC0, DIGOUT_DISABLE=0x00} dallas_a2d_out_T;

//----- Functions ---------------------------------------------------------------

// ds2450Init()
//     initializes the dallas 1-wire bus
void ds2450Init(void);

//----- Single Channel Functions ----------------------------------------------
// The following 4 functions are used for controlling a single channel on the
// a2d converter.  If you are only using 1 channel, then these functions are
// faster.  If you are using 2 or more channel, it is faster to use the All
// Channel Functions.  This is because to convert all the channel only requires
// one command to the device, and then a read of the all the channel.  To read
// two channel individually requires two commands to the device, and two reads.
// Therefore using the All Channel Functions for even just 2 channels is faster
// and more effificient.

// ds2450Setup()
//     Sets up the given device, for the given channel [A-D],
//     the given resolution [1-16] and the given range 0-2.55 or 0-5.10
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450Setup(dallas_rom_id_T* rom_id, u08 channel, u08 resolution, u08 range);

// ds2450Start()
//     Starts the a2d conversion for the given device and the given channel [A-D]
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450Start(dallas_rom_id_T* rom_id, u08 channel);

// ds2450Result()
//     Gets the result from the a2d conversion
//     for the given device and the given channel [A-D]
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450Result(dallas_rom_id_T* rom_id, u08 channel, u16* result);

// ds2450StartAndResult()
//     Starts the conversion of the given device and the given channel [A-D]
//     Stores the result in the variable result
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450StartAndResult(dallas_rom_id_T* rom_id, u08 channel, u16 *result);

//----- All Channel Functions -------------------------------------------------
// The following 4 commands are used to access data from all 4 channels on the
// a2d converter.  These commands should be used if you are using more than one
// channel on the device.  See the Single Channel Functions description for
// more information

// ds2450SetupAll()
//     Sets up the given device for all channels for the given resultion
//     and the given range [0-2.55 or 0-5.10]
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450SetupAll(dallas_rom_id_T* rom_id, u08 resolution, u08 range);

// ds2450StartAll()
//     Starts the conversion for all 4 channels on the given a2d converter
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450StartAll(dallas_rom_id_T* rom_id);

// ds2450ResultAll
//     Gets the results from the given device
//     and stores the result in the given array
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450ResultAll(dallas_rom_id_T* rom_id, u16 result[4]);

// ds2450StartAndResultAll()
//     1-Step command to start the conversion for the given device,
//     and store the results in the given array
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450StartAndResultAll(dallas_rom_id_T* rom_id, u16 result[4]);

// ds2450Print()
//     Does a formatted print on the given result for the given range
void ds2450Print(u16 result, u08 range);

//----- Digital Out Functions -------------------------------------------------
// ds2450DigitalOut
//     Use the given channel of the given device as a digital out
//     Returns either the corresponding error or DALLAS_NO_ERROR
u08  ds2450DigitalOut(dallas_rom_id_T* rom_id, u08 channel, dallas_a2d_out_T state);

#endif