Diff: libraries/ad5270/AD5270.cpp

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24:dae7123d432a

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23:174dd32fa661

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--- a/libraries/ad5270/AD5270.cpp	Tue May 17 18:37:29 2016 +0300
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,283 +0,0 @@
-/**
-*   @file     AD5270.cpp
-*   @brief    Source file for AD5270 rheostat
-*   @author   Analog Devices Inc.
-*
-* For support please go to:
-* Github: https://github.com/analogdevicesinc/mbed-adi
-* Support: https://ez.analog.com/community/linux-device-drivers/microcontroller-no-os-drivers
-* Product: http://www.analog.com/ad5270
-* More: https://wiki.analog.com/resources/tools-software/mbed-drivers-all
-
-********************************************************************************
-* Copyright 2016(c) Analog Devices, Inc.
-*
-* All rights reserved.
-*
-* Redistribution and use in source and binary forms, with or without
-* modification, are permitted provided that the following conditions are met:
-*  - Redistributions of source code must retain the above copyright
-*    notice, this list of conditions and the following disclaimer.
-*  - Redistributions in binary form must reproduce the above copyright
-*    notice, this list of conditions and the following disclaimer in
-*    the documentation and/or other materials provided with the
-*    distribution.
-*  - Neither the name of Analog Devices, Inc. nor the names of its
-*    contributors may be used to endorse or promote products derived
-*    from this software without specific prior written permission.
-*  - The use of this software may or may not infringe the patent rights
-*    of one or more patent holders.  This license does not release you
-*    from the requirement that you obtain separate licenses from these
-*    patent holders to use this software.
-*  - Use of the software either in source or binary form, must be run
-*    on or directly connected to an Analog Devices Inc. component.
-*
-* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
-* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
-* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-* IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
-* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-* LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
-* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*
-********************************************************************************/
-
-
-#include "mbed.h"
-#include "AD5270.h"
-
-/**
- * @brief AD5270 constructor, sets CS pin and SPI format
- * @param CS - (optional)chip select of the AD5270
- * @param max_resistance - (optional) nominal resistance of the AD5270 chip in ohms
- * @param MOSI - (optional)pin of the SPI interface
- * @param MISO - (optional)pin of the SPI interface
- * @param SCK  - (optional)pin of the SPI interface
- */
-AD5270::AD5270(PinName CS, float max_resistance, PinName MOSI, PinName MISO, PinName SCK):
-    ad5270(MOSI, MISO, SCK), cs(CS), _max_resistance(max_resistance)
-{
-    cs = true;
-    ad5270.format(8, _SPI_MODE);
-}
-
-/**
- * @brief Compute for the nearest RDAC value from given resistance
- * @param resistance - resistor
- * @return RDAC value - closest possible to given resistance
- */
-uint16_t AD5270::calc_RDAC(float resistance)
-{
-    return static_cast<uint16_t>( (resistance / _max_resistance) * 1024.0 );
-}
-
-/**
- * @brief sets a new value for the RDAC
- * @param resistance new value for the resistance
- * @return actual value of the resistance in the RDAC
- */
-float AD5270::write_RDAC(float resistance)
-{
-    // Compute for the RDAC code nearest to the required feedback resistance
-    uint16_t RDAC_val = calc_RDAC(resistance);
-    float RDAC_Value = ((static_cast<float> (RDAC_val) * _max_resistance) / 1024.0); // inverse operation to get actual resistance in the RDAC
-    write_wiper_reg(RDAC_val);
-    return RDAC_Value;
-}
-
-/**
- * Reads the RDAC register
- * @return RDAC resistor value
- */
-float AD5270::read_RDAC()
-{
-    uint16_t RDAC_val = read_wiper_reg();
-    return ((static_cast<float> (RDAC_val) * _max_resistance) / 1024.0);
-}
-
-/**
- *	@brief Puts the AD5270 SDO line in to Hi-Z mode
- *	@return none
- */
-void AD5270::set_SDO_HiZ(void)
-{
-    write_reg(HI_Z_Cmd);
-    wait_us(2);
-    write_reg(NO_OP_cmd);
-}
-
-/**
- * @brief Set AD5270 SPI frequency
- * @param hz - SPI bus frequency in hz
- * @return none
- */
-void AD5270::frequency(int hz)
-{
-    ad5270.frequency(hz);
-}
-
-/**
- * @brief Issues AD5270 a command
- * @param command - command to be sent
- * @param data - (optional)value for the requested command
- * @return response form the AD5270
- */
-uint16_t AD5270::write_cmd(uint8_t command, uint16_t data)
-{
-    /* build 16 bit data to be written - Command + Value */
-    uint16_t ui16Command = ((command & 0x3C) << 8) | (data & 0x3FF);
-    return write_reg(ui16Command);
-}
-
-/**
- *  Enables the 50TP memory programming
- */
-void AD5270::enable_50TP_programming()
-{
-    uint8_t regVal = read_ctrl_reg();
-    write_cmd(WRITE_CTRL_REG, regVal | PROGRAM_50TP_ENABLE); // RDAC register write protect -  allow update of wiper position through digital interface
-}
-
-/**
- *  Stores current RDAC content to the 50TP memory
- */
-void AD5270::store_50TP()
-{
-    write_cmd(STORE_50TP);
-    wait_ms(_WRITE_OPERATION_50TP_TIMEOUT);
-}
-
-/**
- * Disables the 50TP memory programming
- */
-void AD5270::disable_50TP_programming()
-{
-    uint8_t regVal = read_ctrl_reg();
-    write_cmd(WRITE_CTRL_REG, regVal & (~PROGRAM_50TP_ENABLE));
-}
-
-/**
- * @brief Writes 16bit data to the AD5270 SPI interface
- * @param data to be written
- * @return data returned by the AD5270
- */
-uint16_t AD5270::write_reg(uint16_t data)
-{
-    uint16_t result;
-    uint8_t upper_byte = (data >> 8) & 0xFF;
-    uint8_t lower_byte =  data & 0xFF;
-    ad5270.format(8, _SPI_MODE);
-    cs = false;
-    result  = ((ad5270.write(upper_byte)) << 8);
-    result |=   ad5270.write(lower_byte);
-    cs = true;
-    return result;
-}
-
-/**
- * @brief Gets maximum resistance of the AD5270 digital rheostat
- * @return maximum resistance in ohms
- */
-float AD5270::get_max_resistance()
-{
-    return _max_resistance;
-}
-
-/**
- * Writes the wiper register. This includes reading the control register,
- * setting write protect off, writing the wiper, and reverting the settings
- * to the control reg.
- * @param data to be written
- */
-void AD5270::write_wiper_reg(uint16_t data)
-{
-    uint8_t reg_val = read_ctrl_reg();
-    write_cmd(WRITE_CTRL_REG, reg_val | RDAC_WRITE_PROTECT); // RDAC register write protect -  allow update of wiper position through digital interface
-    write_cmd(WRITE_RDAC, data); // write data to the RDAC register
-    write_cmd(WRITE_CTRL_REG, reg_val); // RDAC register write protect -  allow update of wiper position through digital interface
-}
-
-/**
- * Reads the wiper register value
- * @return value of the wiper register
- */
-uint16_t AD5270::read_wiper_reg(void)
-{
-    uint16_t RDAC_val;
-    write_cmd(READ_RDAC);
-    wait_us(_REG_OPERATION_TIMEOUT);
-    RDAC_val = write_cmd(NO_OP);
-    return RDAC_val;
-}
-
-/**
- * Reads the last programmed value of the 50TP memory
- * @return last programmed value
- */
-uint8_t AD5270::read_50TP_last_address(void)
-{
-    uint8_t ret_val;
-    write_cmd(READ_50TP_ADDRESS);
-    wait_us(_MEMORY_OPERATION_TIMEOUT);
-    ret_val = write_cmd(NO_OP);
-    return ret_val;
-}
-
-/**
- * Reads the content of a 50TP memory address
- * @param address memory to be read
- * @return value stored in the 50TP address
- */
-uint16_t AD5270::read_50TP_memory(uint8_t address)
-{
-    uint16_t ret_val;
-    write_cmd(READ_50TP_CONTENTS, address);
-    wait_us(_MEMORY_OPERATION_TIMEOUT);
-    ret_val = write_cmd(NO_OP);
-    return ret_val;
-}
-
-/**
- * Writes the control register
- * @param data to be written
- */
-void AD5270::write_ctrl_reg(uint8_t data)
-{
-    write_cmd(WRITE_CTRL_REG, data);
-}
-
-/**
- * Reads the control register
- * @return value of the control register
- */
-uint8_t AD5270::read_ctrl_reg(void)
-{
-    uint8_t ret_val;
-    write_cmd(READ_CTRL_REG);
-    wait_us(_REG_OPERATION_TIMEOUT);
-    ret_val = write_cmd(NO_OP);
-    return ret_val;
-}
-
-/**
- * Resets the wiper register value to the data last written in the 50TP
- */
-void AD5270::reset_RDAC(void)
-{
-    write_cmd(SW_RST);
-}
-
-/**
- * Changes the device mode, enabled or shutdown
- * @param mode - new mode of the device
- */
-void AD5270::change_mode(AD5270Modes_t mode)
-{
-    write_cmd(SW_SHUTDOWN, static_cast<uint8_t>(mode));
-}
-
-
-