library

/*! \file ads7828.h \brief TI ADS7828 12-bit 8ch A/D Converter Driver Library. */
//*****************************************************************************
//
// File Name    : 'ads7828.h'
// Title                : TI ADS7828 12-bit 8ch A/D Converter Driver Library
// Author               : Pascal Stang - Copyright (C) 2004
// Created              : 2004.02.10
// Revised              : 2004.02.19
// Version              : 0.1
// Target MCU   : Atmel AVR Series
// Editor Tabs  : 4
//
// NOTE: This code is currently below version 1.0, and therefore is considered
// to be lacking in some functionality or documentation, or may not be fully
// tested.  Nonetheless, you can expect most functions to work.
//
// This code is distributed under the GNU Public License
//              which can be found at http://www.gnu.org/licenses/gpl.txt
//
///     \ingroup driver_hw
/// \defgroup ads7828 TI ADS7828 I2C A/D Converter Driver (ads7828.c)
/// \code #include "ads7828.h" \endcode
/// \par Overview
///             This library provides high-level functions for accessing the Texas
///             Instruments ADS7828 I2C A/D Converter.
///
///             The basic specs of the ADS7828 are:
///             - 12-bit results
///             - 8 input channels
///             - up to 50KHz conversion rate
///             - External reference or internal 2.5V reference
//
//*****************************************************************************
//@{

#ifndef ADS7828_H
#define ADS7828_H

#include "global.h"

// constants/macros/typdefs
#define ADS7828_I2C_ADDR        0x90    ///< Base I2C address of ADS7828 devices

// command register bit defines
#define ADS7828_CMD_PD0         0x04    ///< ADS7828 Power-down bit 0
#define ADS7828_CMD_PD1         0x08    ///< ADS7828 Power-down bit 1
#define ADS7828_CMD_C0          0x10    ///< ADS7828 Channel Select bit 0
#define ADS7828_CMD_C1          0x20    ///< ADS7828 Channel Select bit 1
#define ADS7828_CMD_C2          0x40    ///< ADS7828 Channel Select bit 2
#define ADS7828_CMD_SD          0x80    ///< ADS7828 Single-ended/Differential Select bit

// single-ended channel order defines
#define ADS7828_CMD_CH0         0x00    ///< ADS7828 Convert Channel 0
#define ADS7828_CMD_CH1         0x04    ///< ADS7828 Convert Channel 1
#define ADS7828_CMD_CH2         0x01    ///< ADS7828 Convert Channel 2
#define ADS7828_CMD_CH3         0x05    ///< ADS7828 Convert Channel 3
#define ADS7828_CMD_CH4         0x02    ///< ADS7828 Convert Channel 4
#define ADS7828_CMD_CH5         0x06    ///< ADS7828 Convert Channel 5
#define ADS7828_CMD_CH6         0x03    ///< ADS7828 Convert Channel 6
#define ADS7828_CMD_CH7         0x07    ///< ADS7828 Convert Channel 7

// power-down mode defines
#define ADS7828_CMD_PDMODE0     0x00    ///< ADS7828 Power-down Mode 0
#define ADS7828_CMD_PDMODE1     0x04    ///< ADS7828 Power-down Mode 1
#define ADS7828_CMD_PDMODE2     0x08    ///< ADS7828 Power-down Mode 2
#define ADS7828_CMD_PDMODE3     0x0C    ///< ADS7828 Power-down Mode 3

// functions

//! Initialize the ADS7828 chip.
///     Returns:
///     TRUE if successful, 
///     FALSE if unsuccessful (chip not present).
u08 ads7828Init(u08 i2cAddr);

//! Set the voltage reference to use for A/D conversion.
///     - ref = 0  =>  External reference voltage on Ref pin.
///     - ref = 1  =>  Internal 2.5V reference voltage (Ref pin left open).
void ads7828SetReference(u08 ref);

//! Begin single-ended conversion on given logical channel#, and return result.
u16 ads7828Convert(u08 i2cAddr, u08 channel);

//! Begin differential conversion on given channel pair, and return result.
u16 ads7828ConvertDiff(u08 i2cAddr, u08 channel);

//! Begin conversion on given raw channel#, and return result.
u16 ads7828ConvertRaw(u08 i2cAddr, u08 channel);

#endif
//@}