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libraries/ad7790/AD7790.cpp@3:1a8c14043a4e, 2016-04-01 (annotated)

Committer:
Suciu
Date:
Fri Apr 01 10:53:41 2016 +0300
Revision:
3:1a8c14043a4e
Parent:
1:c1f0670bb370
Child:
4:5c1b28aff7e1
Added license, file headers and fixed missing whitespaces

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Suciu 1:c1f0670bb370 1 /**
Suciu 1:c1f0670bb370 2 * @file AD7790.cpp
Suciu 1:c1f0670bb370 3 * @brief Source file for AD7790 ADC
Suciu 3:1a8c14043a4e 4 * @author Analog Devices Inc.
Suciu 3:1a8c14043a4e 5 *
Suciu 3:1a8c14043a4e 6 * For support please go to:
Suciu 3:1a8c14043a4e 7 * Github: https://github.com/analogdevicesinc/mbed-adi
Suciu 3:1a8c14043a4e 8 * Support: https://ez.analog.com/community/linux-device-drivers/microcontroller-no-os-drivers
Suciu 3:1a8c14043a4e 9 * Product: http://www.analog.com/ad7790
Suciu 3:1a8c14043a4e 10 * More: https://wiki.analog.com/resources/tools-software/mbed-drivers-all
Suciu 3:1a8c14043a4e 11
Suciu 3:1a8c14043a4e 12 ********************************************************************************
Suciu 3:1a8c14043a4e 13 * Copyright 2016(c) Analog Devices, Inc.
Suciu 3:1a8c14043a4e 14 *
Suciu 3:1a8c14043a4e 15 * All rights reserved.
Suciu 3:1a8c14043a4e 16 *
Suciu 3:1a8c14043a4e 17 * Redistribution and use in source and binary forms, with or without
Suciu 3:1a8c14043a4e 18 * modification, are permitted provided that the following conditions are met:
Suciu 3:1a8c14043a4e 19 * - Redistributions of source code must retain the above copyright
Suciu 3:1a8c14043a4e 20 * notice, this list of conditions and the following disclaimer.
Suciu 3:1a8c14043a4e 21 * - Redistributions in binary form must reproduce the above copyright
Suciu 3:1a8c14043a4e 22 * notice, this list of conditions and the following disclaimer in
Suciu 3:1a8c14043a4e 23 * the documentation and/or other materials provided with the
Suciu 3:1a8c14043a4e 24 * distribution.
Suciu 3:1a8c14043a4e 25 * - Neither the name of Analog Devices, Inc. nor the names of its
Suciu 3:1a8c14043a4e 26 * contributors may be used to endorse or promote products derived
Suciu 3:1a8c14043a4e 27 * from this software without specific prior written permission.
Suciu 3:1a8c14043a4e 28 * - The use of this software may or may not infringe the patent rights
Suciu 3:1a8c14043a4e 29 * of one or more patent holders. This license does not release you
Suciu 3:1a8c14043a4e 30 * from the requirement that you obtain separate licenses from these
Suciu 3:1a8c14043a4e 31 * patent holders to use this software.
Suciu 3:1a8c14043a4e 32 * - Use of the software either in source or binary form, must be run
Suciu 3:1a8c14043a4e 33 * on or directly connected to an Analog Devices Inc. component.
Suciu 3:1a8c14043a4e 34 *
Suciu 3:1a8c14043a4e 35 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
Suciu 3:1a8c14043a4e 36 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
Suciu 3:1a8c14043a4e 37 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
Suciu 3:1a8c14043a4e 38 * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
Suciu 3:1a8c14043a4e 39 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
Suciu 3:1a8c14043a4e 40 * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
Suciu 3:1a8c14043a4e 41 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Suciu 3:1a8c14043a4e 42 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Suciu 3:1a8c14043a4e 43 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Suciu 3:1a8c14043a4e 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Suciu 3:1a8c14043a4e 45 *
Suciu 3:1a8c14043a4e 46 ********************************************************************************/
Suciu 1:c1f0670bb370 47
Suciu 1:c1f0670bb370 48 #include <stdint.h>
Suciu 1:c1f0670bb370 49 #include "mbed.h"
Suciu 1:c1f0670bb370 50 #include "ad7790.h"
Suciu 1:c1f0670bb370 51
Suciu 1:c1f0670bb370 52
Suciu 1:c1f0670bb370 53 /**
Suciu 1:c1f0670bb370 54 * @brief AD7790 constructor, sets CS pin and SPI format
Suciu 1:c1f0670bb370 55 * @param CS - (optional)chip select of the AD7790
Suciu 1:c1f0670bb370 56 * @param MOSI - (optional)pin of the SPI interface
Suciu 1:c1f0670bb370 57 * @param MISO - (optional)pin of the SPI interface
Suciu 1:c1f0670bb370 58 * @param SCK - (optional)pin of the SPI interface
Suciu 1:c1f0670bb370 59 */
Suciu 1:c1f0670bb370 60 AD7790::AD7790(PinName CS,
Suciu 1:c1f0670bb370 61 PinName MOSI,
Suciu 1:c1f0670bb370 62 PinName MISO,
Suciu 1:c1f0670bb370 63 PinName SCK) :
Suciu 3:1a8c14043a4e 64 ad7790(MOSI, MISO, SCK), cs(CS)
Suciu 1:c1f0670bb370 65 {
Suciu 3:1a8c14043a4e 66 ad7790.format(8, 3);
Suciu 1:c1f0670bb370 67 cs = true; // cs is active low
Suciu 1:c1f0670bb370 68 }
Suciu 1:c1f0670bb370 69
Suciu 1:c1f0670bb370 70 /**
Suciu 1:c1f0670bb370 71 * @brief Set AD7790 SPI frequency
Suciu 1:c1f0670bb370 72 * @param hz - SPI bus frequency in hz
Suciu 1:c1f0670bb370 73 * @return none
Suciu 1:c1f0670bb370 74 */
Suciu 1:c1f0670bb370 75 void AD7790::frequency(int hz)
Suciu 1:c1f0670bb370 76 {
Suciu 1:c1f0670bb370 77 ad7790.frequency(hz);
Suciu 1:c1f0670bb370 78 }
Suciu 1:c1f0670bb370 79
Suciu 1:c1f0670bb370 80 /**
Suciu 1:c1f0670bb370 81 * @brief Resets the AD7790
Suciu 1:c1f0670bb370 82 * @return none
Suciu 1:c1f0670bb370 83 */
Suciu 1:c1f0670bb370 84 void AD7790::reset()
Suciu 1:c1f0670bb370 85 {
Suciu 1:c1f0670bb370 86 cs = false;
Suciu 1:c1f0670bb370 87 ad7790.write(_RESET);
Suciu 1:c1f0670bb370 88 ad7790.write(_RESET);
Suciu 1:c1f0670bb370 89 ad7790.write(_RESET);
Suciu 1:c1f0670bb370 90 ad7790.write(_RESET);
Suciu 1:c1f0670bb370 91 cs = true;
Suciu 1:c1f0670bb370 92 }
Suciu 1:c1f0670bb370 93
Suciu 1:c1f0670bb370 94 /**
Suciu 1:c1f0670bb370 95 * @brief Reads the data register of the AD7790
Suciu 1:c1f0670bb370 96 * @return value of the register
Suciu 1:c1f0670bb370 97 */
Suciu 1:c1f0670bb370 98 uint16_t AD7790::read_data(void)
Suciu 1:c1f0670bb370 99 {
Suciu 1:c1f0670bb370 100 uint16_t dataResult = 0;
Suciu 1:c1f0670bb370 101
Suciu 1:c1f0670bb370 102 cs = false;
Suciu 1:c1f0670bb370 103 ad7790.write(_DATA_READ);
Suciu 1:c1f0670bb370 104 dataResult = ((ad7790.write(_DUMMY_BYTE)) << 8);
Suciu 1:c1f0670bb370 105 dataResult |= (ad7790.write(_DUMMY_BYTE));
Suciu 1:c1f0670bb370 106 cs = true;
Suciu 1:c1f0670bb370 107
Suciu 1:c1f0670bb370 108 return dataResult;
Suciu 1:c1f0670bb370 109 }
Suciu 1:c1f0670bb370 110
Suciu 1:c1f0670bb370 111 /**
Suciu 1:c1f0670bb370 112 * @brief Reads a register of the AD7790
Suciu 1:c1f0670bb370 113 * @param regAddress - address of the register
Suciu 1:c1f0670bb370 114 * @return value of the register
Suciu 1:c1f0670bb370 115 */
Suciu 1:c1f0670bb370 116 uint16_t AD7790::read_reg(AD7790Registers_t regAddress)
Suciu 1:c1f0670bb370 117 {
Suciu 1:c1f0670bb370 118 uint16_t data = regAddress << 12;
Suciu 1:c1f0670bb370 119 data |= _DUMMY_BYTE;
Suciu 1:c1f0670bb370 120 data |= _READ_FLAG;
Suciu 1:c1f0670bb370 121 return write_spi(data);
Suciu 1:c1f0670bb370 122 }
Suciu 1:c1f0670bb370 123
Suciu 1:c1f0670bb370 124 /**
Suciu 1:c1f0670bb370 125 * @brief Writes a register of the AD7790
Suciu 1:c1f0670bb370 126 * @param regAddress - address of the register
Suciu 1:c1f0670bb370 127 * @param regValue - value to be written
Suciu 1:c1f0670bb370 128 * @return none
Suciu 1:c1f0670bb370 129 *
Suciu 1:c1f0670bb370 130 */
Suciu 3:1a8c14043a4e 131 void AD7790::write_reg(AD7790Registers_t regAddress, uint8_t regValue)
Suciu 1:c1f0670bb370 132 {
Suciu 1:c1f0670bb370 133 uint16_t data = regAddress << 12;
Suciu 1:c1f0670bb370 134 data |= regValue;
Suciu 1:c1f0670bb370 135 write_spi(data);
Suciu 1:c1f0670bb370 136 }
Suciu 1:c1f0670bb370 137
Suciu 1:c1f0670bb370 138 /**
Suciu 1:c1f0670bb370 139 * @brief Writes 16bit data to the AD7790 SPI interface
Suciu 1:c1f0670bb370 140 * @param data to be written
Suciu 1:c1f0670bb370 141 * @return data returned by the AD7790
Suciu 1:c1f0670bb370 142 */
Suciu 1:c1f0670bb370 143 uint16_t AD7790::write_spi(uint16_t data)
Suciu 1:c1f0670bb370 144 {
Suciu 1:c1f0670bb370 145 uint16_t result;
Suciu 1:c1f0670bb370 146 uint8_t upper_byte = (data >> 8) & 0xFF;
Suciu 1:c1f0670bb370 147 uint8_t lower_byte = data & 0xFF;
Suciu 1:c1f0670bb370 148 cs = false;
Suciu 1:c1f0670bb370 149 result = (ad7790.write(upper_byte) << 8);
Suciu 1:c1f0670bb370 150 result |= ad7790.write(lower_byte);
Suciu 1:c1f0670bb370 151 cs = true;
Suciu 1:c1f0670bb370 152 return result;
Suciu 1:c1f0670bb370 153 }
Suciu 1:c1f0670bb370 154
Suciu 1:c1f0670bb370 155
Suciu 1:c1f0670bb370 156