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Procyon AVRlib: ads7870.h Source File Main Page | Modules | Data Structures | Directories | File List | Data Fields | Globals ads7870.hGo to the documentation of this file.00001 /*! \file ads7870.h \brief TI ADS7870 12-bit 8ch A/D Converter Driver Library. */ 00002 //***************************************************************************** 00003 // 00004 // File Name : 'ads7870.h' 00005 // Title : TI ADS7870 12-bit 8ch A/D Converter Driver Library 00006 // Author : Pascal Stang - Copyright (C) 2005 00007 // Created : 2005.07.19 00008 // Revised : 2005.07.21 00009 // Version : 0.1 00010 // Target MCU : Atmel AVR Series 00011 // Editor Tabs : 4 00012 // 00013 // NOTE: This code is currently below version 1.0, and therefore is considered 00014 // to be lacking in some functionality or documentation, or may not be fully 00015 // tested. Nonetheless, you can expect most functions to work. 00016 // 00017 // This code is distributed under the GNU Public License 00018 // which can be found at http://www.gnu.org/licenses/gpl.txt 00019 // 00020 /// \ingroup driver_hw 00021 /// \defgroup ads7870 TI ADS7870 SPI A/D Converter Driver (ads7870.c) 00022 /// \code #include "ads7870.h" \endcode 00023 /// \par Overview 00024 /// This library provides high-level functions for accessing the Texas 00025 /// Instruments ADS7870 I2C A/D Converter. 00026 /// 00027 /// The basic specs of the ADS7870 are: 00028 /// - Fast SPI interface (up to 20MHz) 00029 /// - 12-bit results 00030 /// - 8 single-ended or 4 differential input channels 00031 /// - Programmable gain stage (1,2,4,5,8,10,16,20x gains) 00032 /// - Software or hardware triggered conversion 00033 /// - 4-bit auxiliary digital I/O lines (controlled via serial interface) 00034 /// - Up to 50KHz conversion rate 00035 /// - External reference or internal 2.5V, 2.048V, 1.15V reference 00036 /// - NOTE: use pin-compatible ADS7871 for 14-bit results 00037 // 00038 //***************************************************************************** 00039 //@{ 00040 00041 #ifndef ADS7870_H 00042 #define ADS7870_H 00043 00044 #include "global.h" 00045 00046 // constants/macros/typdefs 00047 #define ADS7870_CS_PORT PORTB 00048 #define ADS7870_CS_DDR DDRB 00049 #define ADS7870_CS_PIN PB0 00050 00051 // instruction bit defines 00052 #define ADS7870_CONVERT 0x80 00053 00054 #define ADS7870_REG_READ 0x40 00055 #define ADS7870_REG_WRITE 0x00 00056 #define ADS7870_REG_16BIT 0x20 00057 00058 // register addresses 00059 #define ADS7870_RESULTLO 0x00 00060 #define ADS7870_RESULTHI 0x01 00061 #define ADS7870_PGAVALID 0x02 00062 #define ADS7870_ADCTRL 0x03 00063 #define ADS7870_GAINMUX 0x04 00064 #define ADS7870_DIGIOSTATE 0x05 00065 #define ADS7870_DIGIOCTRL 0x06 00066 #define ADS7870_REFOSC 0x07 00067 #define ADS7870_SERIFCTRL 0x18 00068 #define ADS7870_ID 0x1F 00069 00070 // register bit defines 00071 #define ADS7870_RESULTLO_OVR 0x01 00072 00073 #define ADS7870_ADCTRL_BIN 0x20 00074 #define ADS7870_ADCTRL_RMB1 0x08 00075 #define ADS7870_ADCTRL_RMB0 0x04 00076 #define ADS7870_ADCTRL_CFD1 0x02 00077 #define ADS7870_ADCTRL_CFD0 0x01 00078 00079 #define ADS7870_GAINMUX_CNVBSY 0x80 00080 00081 #define ADS7870_REFOSC_OSCR 0x20 00082 #define ADS7870_REFOSC_OSCE 0x10 00083 #define ADS7870_REFOSC_REFE 0x08 00084 #define ADS7870_REFOSC_BUFE 0x04 00085 #define ADS7870_REFOSC_R2V 0x02 00086 #define ADS7870_REFOSC_RBG 0x01 00087 00088 #define ADS7870_SERIFCTRL_LSB 0x01 00089 #define ADS7870_SERIFCTRL_2W3W 0x02 00090 #define ADS7870_SERIFCTRL_8051 0x04 00091 00092 #define ADS7870_ID_VALUE 0x01 00093 00094 // gain defines 00095 #define ADS7870_GAIN_1X 0x00 00096 #define ADS7870_GAIN_2X 0x10 00097 #define ADS7870_GAIN_4X 0x20 00098 #define ADS7870_GAIN_5X 0x30 00099 #define ADS7870_GAIN_8X 0x40 00100 #define ADS7870_GAIN_10X 0x50 00101 #define ADS7870_GAIN_16X 0x60 00102 #define ADS7870_GAIN_20X 0x70 00103 // channel defines 00104 #define ADS7870_CH_0_1_DIFF 0x00 00105 #define ADS7870_CH_2_3_DIFF 0x01 00106 #define ADS7870_CH_4_5_DIFF 0x02 00107 #define ADS7870_CH_6_7_DIFF 0x03 00108 #define ADS7870_CH_1_0_DIFF 0x04 00109 #define ADS7870_CH_3_2_DIFF 0x05 00110 #define ADS7870_CH_5_4_DIFF 0x06 00111 #define ADS7870_CH_7_6_DIFF 0x07 00112 #define ADS7870_CH_SINGLE_ENDED 0x08 00113 #define ADS7870_CH_0 0x08 00114 #define ADS7870_CH_1 0x09 00115 #define ADS7870_CH_2 0x0A 00116 #define ADS7870_CH_3 0x0B 00117 #define ADS7870_CH_4 0x0C 00118 #define ADS7870_CH_5 0x0D 00119 #define ADS7870_CH_6 0x0E 00120 #define ADS7870_CH_7 0x0F 00121 00122 // functions 00123 00124 //! Initialize the ADS7870 chip. 00125 /// Returns: 00126 /// TRUE if successful, 00127 /// FALSE if unsuccessful (chip not responding). 00128 u08 ads7870Init(void); 00129 00130 //! Begin single-ended conversion on given logical channel#0-7, and return result. 00131 /// \note Result is returned left-justified. 00132 s16 ads7870Convert(u08 channel); 00133 00134 //! Begin differential conversion on given channel pair, and return result. 00135 /// \note Result is returned left-justified. 00136 s16 ads7870ConvertDiff(u08 channel); 00137 00138 //! Begin conversion on given raw channel#, and return result. 00139 /// \note Result is returned left-justified. 00140 s16 ads7870ConvertRaw(u08 channel); 00141 00142 //! Read value from ADS7870 register. 00143 /// 00144 u08 ads7870ReadReg(u08 reg); 00145 00146 //! Write value into ADS7870 register. 00147 /// 00148 void ads7870WriteReg(u08 reg, u08 value); 00149 00150 00151 00152 #endif 00153 //@} Generated on Mon Aug 22 04:29:27 2005 for Procyon AVRlib by 1.4.2
