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77 lines
3.0 KiB
C
77 lines
3.0 KiB
C
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/*! \file ads7828.h \brief TI ADS7828 12-bit 8ch A/D Converter Driver Library. */
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//*****************************************************************************
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//
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// File Name : 'ads7828.h'
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// Title : TI ADS7828 12-bit 8ch A/D Converter Driver Library
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// Author : Pascal Stang - Copyright (C) 2004
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// Created : 2004.02.10
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// Revised : 2004.02.19
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// Version : 0.1
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// Target MCU : Atmel AVR Series
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// Editor Tabs : 4
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//
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// NOTE: This code is currently below version 1.0, and therefore is considered
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// to be lacking in some functionality or documentation, or may not be fully
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// tested. Nonetheless, you can expect most functions to work.
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//
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// This code is distributed under the GNU Public License
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// which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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#ifndef ADS7828_H
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#define ADS7828_H
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#include "global.h"
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// constants/macros/typdefs
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#define ADS7828_I2C_ADDR 0x90 //< Base I2C address of ADS7828 devices
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// command register bit defines
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#define ADS7828_CMD_PD0 0x04 //< ADS7828 Power-down bit 0
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#define ADS7828_CMD_PD1 0x08 //< ADS7828 Power-down bit 1
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#define ADS7828_CMD_C0 0x10 //< ADS7828 Channel Select bit 0
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#define ADS7828_CMD_C1 0x20 //< ADS7828 Channel Select bit 1
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#define ADS7828_CMD_C2 0x40 //< ADS7828 Channel Select bit 2
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#define ADS7828_CMD_SD 0x80 //< ADS7828 Single-ended/Differential Select bit
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// single-ended channel order defines
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#define ADS7828_CMD_CH0 0x00 //< ADS7828 Convert Channel 0
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#define ADS7828_CMD_CH1 0x04 //< ADS7828 Convert Channel 1
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#define ADS7828_CMD_CH2 0x01 //< ADS7828 Convert Channel 2
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#define ADS7828_CMD_CH3 0x05 //< ADS7828 Convert Channel 3
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#define ADS7828_CMD_CH4 0x02 //< ADS7828 Convert Channel 4
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#define ADS7828_CMD_CH5 0x06 //< ADS7828 Convert Channel 5
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#define ADS7828_CMD_CH6 0x03 //< ADS7828 Convert Channel 6
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#define ADS7828_CMD_CH7 0x07 //< ADS7828 Convert Channel 7
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// power-down mode defines
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#define ADS7828_CMD_PDMODE0 0x00 //< ADS7828 Power-down Mode 0
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#define ADS7828_CMD_PDMODE1 0x04 //< ADS7828 Power-down Mode 1
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#define ADS7828_CMD_PDMODE2 0x08 //< ADS7828 Power-down Mode 2
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#define ADS7828_CMD_PDMODE3 0x0C //< ADS7828 Power-down Mode 3
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// functions
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//! Initialize the ADS7828 chip
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// returns:
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// TRUE if successful
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// FALSE if unsuccessful (chip not present)
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u08 ads7828Init(u08 i2cAddr);
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//! Set the voltage reference to use for A/D conversion
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// ref = 0 => External reference voltage on Ref pin
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// ref = 1 => Internal 2.5V reference voltage (Ref pin left open)
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void ads7828SetReference(u08 ref);
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//! Begin single-ended conversion on given logical channel#, and return result
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u16 ads7828Convert(u08 i2cAddr, u08 channel);
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//! Begin differential conversion on given channel pair, and return result
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u16 ads7828ConvertDiff(u08 i2cAddr, u08 channel);
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//! Begin conversion on given raw channel#, and return result
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u16 ads7828ConvertRaw(u08 i2cAddr, u08 channel);
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#endif
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