A collection of Analog Devices drivers for the mbed platform
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AD7791.h
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00001 /** 00002 * @file AD7791.h 00003 * @brief Header file for AD7791 ADC 00004 * @author Analog Devices Inc. 00005 * 00006 * For support please go to: 00007 * Github: https://github.com/analogdevicesinc/mbed-adi 00008 * Support: https://ez.analog.com/community/linux-device-drivers/microcontroller-no-os-drivers 00009 * Product: http://www.analog.com/ad7791 00010 * More: https://wiki.analog.com/resources/tools-software/mbed-drivers-all 00011 00012 ******************************************************************************** 00013 * Copyright 2016(c) Analog Devices, Inc. 00014 * 00015 * All rights reserved. 00016 * 00017 * Redistribution and use in source and binary forms, with or without 00018 * modification, are permitted provided that the following conditions are met: 00019 * - Redistributions of source code must retain the above copyright 00020 * notice, this list of conditions and the following disclaimer. 00021 * - Redistributions in binary form must reproduce the above copyright 00022 * notice, this list of conditions and the following disclaimer in 00023 * the documentation and/or other materials provided with the 00024 * distribution. 00025 * - Neither the name of Analog Devices, Inc. nor the names of its 00026 * contributors may be used to endorse or promote products derived 00027 * from this software without specific prior written permission. 00028 * - The use of this software may or may not infringe the patent rights 00029 * of one or more patent holders. This license does not release you 00030 * from the requirement that you obtain separate licenses from these 00031 * patent holders to use this software. 00032 * - Use of the software either in source or binary form, must be run 00033 * on or directly connected to an Analog Devices Inc. component. 00034 * 00035 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR 00036 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, 00037 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 00038 * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, 00039 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00040 * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR 00041 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00042 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00043 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00044 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00045 * 00046 ********************************************************************************/ 00047 00048 #ifndef AD7791_H 00049 #define AD7791_H 00050 00051 #include "mbed.h" 00052 00053 /** 00054 * Comment this line if you want to turn off the debug mode. 00055 * The debug mode will send a message if an exception occurs within AD7791 driver 00056 */ 00057 00058 #define AD7791_DEBUG_MODE 00059 00060 /** 00061 * @brief Analog Devices AD7791 SPI 16-bit Buffered Sigma-Delta ADC 00062 */ 00063 class AD7791 00064 { 00065 public: 00066 /// AD7791 registers 00067 typedef enum { 00068 COMMUNICATION_REG = 0, ///< Communication register 00069 STATUS_REG = 0, ///< Status register 00070 MODE_REG, ///< Mode register 00071 FILTER_REG, ///< Filter Register 00072 DATA_REG ///< Data register 00073 } AD7791Register_t; 00074 00075 /// AD7791 channel configuration 00076 typedef enum { 00077 DIFFERENTIAL = 0, ///< AIN(+)-AIN(-) 00078 RESERVED, ///< reserved 00079 SHORT, ///< AIN(-)-AIN(-) 00080 VDDMONITOR ///< Monitor VDD 00081 } AD7791Channel_t; 00082 00083 typedef enum { 00084 CONTINOUS_CONVERSION_MODE = 0, 00085 SINGLE_CONVERSION_MODE = 0x80, 00086 SHUTDOWN_MODE = 0xC0 00087 } AD7791Mode_t; 00088 00089 typedef enum { 00090 MD1 = 0x80, ///< Mode Select Bit 1 00091 MD0 = 0x40, ///< Mode Select Bit 0 00092 // G1 = 0x20, ///< Range bit 1 00093 // G0 = 0x10, ///< Range bit 0 00094 BO = 0x08, ///< Burnout Current Enable bit 00095 UB = 0x04, ///< Unipolar/Bipolar bit 00096 BUF = 0x02, ///< Buffered mode bit 00097 } ModeRegisterBits_t ; 00098 00099 typedef enum { 00100 CLKDIV1 = 0x40, ///< Clock divider bit 1 00101 CLKDIV0 = 0x20, ///< Clock divider bit 0 00102 FS2 = 0x04, ///< Update rate bit 2 00103 FS1 = 0x02, ///< Update rate bit 1 00104 FS0 = 0x01, ///< Update rate bit 0 00105 } FilterRegisterBits_t ; 00106 00107 /* typedef enum { 00108 RANGE_VREF = 0, 00109 RANGE_VREF_DIV_2, 00110 RANGE_VREF_DIV_4, 00111 RANGE_VREF_DIV_8, 00112 } AnalogInputRange_t; 00113 */ 00114 /** SPI configuration & constructor */ 00115 AD7791( float reference_voltage, PinName CS = SPI_CS, PinName MOSI = SPI_MOSI, PinName MISO = SPI_MISO, PinName SCK = SPI_SCK); 00116 void frequency(int hz); 00117 00118 /** Low level SPI bus comm methods */ 00119 void reset(void); 00120 00121 /** Register access methods*/ 00122 void set_channel(AD7791Channel_t channel); 00123 void set_conversion_mode(AD7791Mode_t mode); 00124 uint32_t read_data_reg(); 00125 uint8_t read_status_reg(void); 00126 void write_filter_reg(uint8_t regVal); 00127 uint8_t read_filter_reg(void); 00128 void write_mode_reg(uint8_t regVal); 00129 uint8_t read_mode_reg(void); 00130 // void set_range(AnalogInputRange_t range); 00131 // AnalogInputRange_t get_range(void); 00132 00133 /** Reference voltage methods */ 00134 void set_reference_voltage(float ref); 00135 float get_reference_voltage(void); 00136 00137 /** Voltage read methods */ 00138 float read_voltage(void); 00139 float data_to_voltage(uint32_t data); 00140 uint32_t voltage_to_data(float voltage); 00141 00142 /** AnalogIn API */ 00143 float read(void); 00144 uint32_t read_u32(void); 00145 uint16_t read_u16(void); 00146 00147 #ifdef MBED_OPERATORS 00148 operator float(); 00149 #endif 00150 00151 private: 00152 DigitalIn miso; 00153 SPI ad7791; ///< SPI instance of the AD7791 00154 DigitalOut cs; ///< DigitalOut instance for the chipselect of the AD7791 00155 00156 float _vref; 00157 // uint8_t _PGA_gain; 00158 bool _continous_conversion; 00159 AD7791Channel_t _channel; 00160 00161 void write_reg(AD7791Register_t regAddress, uint8_t regValue); 00162 uint16_t write_spi(uint16_t data); 00163 uint16_t read_reg (AD7791Register_t regAddress); 00164 00165 const static uint16_t _SINGLE_CONVERSION_TIMEOUT = 0xFFFF; // in 10us = 100ms 00166 const static uint16_t _CONTINOUS_CONVERSION_TIMEOUT = 0xFFFF; 00167 const static uint32_t _RESOLUTION = 0xFFFFFF; 00168 const static uint8_t _RESET = 0xFF; 00169 const static uint8_t _DUMMY_BYTE = 0xFF; 00170 const static uint16_t _READ_FLAG = 0x0800; 00171 const static uint8_t _DATA_READ = 0x38; // Read from the Data Register 00172 const static uint8_t _DELAY_TIMING = 0x02; 00173 const static uint8_t _SPI_MODE = 3; 00174 }; 00175 00176 #endif
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