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Macros | Functions
ad5449.c File Reference

Implementation of AD5449 Driver. More...

#include <stdlib.h>
#include "ad5449.h"
Include dependency graph for ad5449.c:

Macros

#define MAX_RESOLUTION   12 /* Maximum resolution of the supported devices */
 
#define DATA_MASK   0xFFF /* Mask for 16 data bits */
 
#define CMD_MASK   0xFF /* Mask for Command bits */
 
#define CMD_OFFSET   12 /* Offset for Command */
 
#define MSB_MASK   0xFF00 /* Most significant byte of the data word */
 
#define MSB_OFFSET   8
 
#define LSB_MASK   0x00FF /* Least significant byte of the data word */
 
#define LSB_OFFSET   0
 
#define PKT_LENGTH   2 /* SPI packet length in byte */
 
#define TWO_BIT_MASK   0x3
 

Functions

int8_t ad5449_init (struct ad5449_dev **device, struct ad5449_init_param init_param)
 Initialize SPI and Initial Values for AD5449 Board. More...
 
int32_t ad5449_remove (struct ad5449_dev *dev)
 Free the resources allocated by ad5449_init(). More...
 
uint16_t ad5449_set_input_shift_reg (struct ad5449_dev *dev, uint16_t command, uint16_t data)
 Write to input register and read from output register via SPI. More...
 
void ad5449_load_update_channel (struct ad5449_dev *dev, uint8_t channel, uint16_t dac_value)
 Loads and updates the selected DAC with a given value. More...
 
void ad5449_load_channel (struct ad5449_dev *dev, uint8_t channel, uint16_t dac_value)
 Load selected DAC input register with a given value. More...
 
uint16_t ad5449_readback_channel (struct ad5449_dev *dev, uint8_t channel)
 Read from the selected DAC register. More...
 
void ad5449_update_all (struct ad5449_dev *dev)
 Update the DAC outputs. This function has a physical result just with devices with two channels. More...
 
void ad5449_load_all (struct ad5449_dev *dev, int16_t dac_value)
 Load the DAC input registers. This function has a physical result just with devices with two channels. More...
 
void ad5449_clear_scale_setup (struct ad5449_dev *dev, int8_t type)
 Set up the scale where to the output will be cleared on active CLR signal. More...
 
void ad5449_daisy_chain_setup (struct ad5449_dev *dev, int8_t value)
 Enable/disable the Daisy-Chain mode. More...
 
void ad5449_sdocontrol (struct ad5449_dev *dev, int8_t control_bits)
 Control the SDO output driver strength. This function is supported by the devices : AD5415, AD5429, AD5439, AD5449. More...
 
void ad5449_sclksetup (struct ad5449_dev *dev, int8_t value)
 Set up the active clock edge of the SPI interface. More...
 

Detailed Description

Implementation of AD5449 Driver.

Author
Istvan Csomortani (istva.nosp@m.n.cs.nosp@m.omort.nosp@m.ani@.nosp@m.analo.nosp@m.g.co.nosp@m.m)

Copyright 2013(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:

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

Macro Definition Documentation

◆ CMD_MASK

#define CMD_MASK   0xFF /* Mask for Command bits */

◆ CMD_OFFSET

#define CMD_OFFSET   12 /* Offset for Command */

◆ DATA_MASK

#define DATA_MASK   0xFFF /* Mask for 16 data bits */

◆ LSB_MASK

#define LSB_MASK   0x00FF /* Least significant byte of the data word */

◆ LSB_OFFSET

#define LSB_OFFSET   0

◆ MAX_RESOLUTION

#define MAX_RESOLUTION   12 /* Maximum resolution of the supported devices */

◆ MSB_MASK

#define MSB_MASK   0xFF00 /* Most significant byte of the data word */

◆ MSB_OFFSET

#define MSB_OFFSET   8

◆ PKT_LENGTH

#define PKT_LENGTH   2 /* SPI packet length in byte */

◆ TWO_BIT_MASK

#define TWO_BIT_MASK   0x3

Function Documentation

◆ ad5449_clear_scale_setup()

void ad5449_clear_scale_setup ( struct ad5449_dev dev,
int8_t  type 
)

Set up the scale where to the output will be cleared on active CLR signal.

Parameters
dev- The device structure.
type- target scale when making a clear command Example: ZERO_SCALE = zero scale. MIDSCALE = midscale.
Returns
None.

◆ ad5449_daisy_chain_setup()

void ad5449_daisy_chain_setup ( struct ad5449_dev dev,
int8_t  value 
)

Enable/disable the Daisy-Chain mode.

Parameters
dev- The device structure.
value- target scale when making a clear command Example: ZERO_SCALE = zero scale. MIDSCALE = midscale.
Returns
None.

◆ ad5449_init()

int8_t ad5449_init ( struct ad5449_dev **  device,
struct ad5449_init_param  init_param 
)

Initialize SPI and Initial Values for AD5449 Board.

Parameters
device- The device structure.
init_param- The structure that contains the device initial parameters.
Returns
retValue - Result of the initialization. Example: 0 - if initialization was successful; -1 - if initialization was unsuccessful.

◆ ad5449_load_all()

void ad5449_load_all ( struct ad5449_dev dev,
int16_t  dac_value 
)

Load the DAC input registers. This function has a physical result just with devices with two channels.

Parameters
dev- The device structure.
dac_value- desired value to be written in register.
Returns
None.

◆ ad5449_load_channel()

void ad5449_load_channel ( struct ad5449_dev dev,
uint8_t  channel,
uint16_t  dac_value 
)

Load selected DAC input register with a given value.

Parameters
dev- The device structure.
channel- the chosen channel to write to. Example: AD5449_CH_A = 0; AD5449_CH_B = 1.
dac_value- desired value to be written in register.
Returns
None.

◆ ad5449_load_update_channel()

void ad5449_load_update_channel ( struct ad5449_dev dev,
uint8_t  channel,
uint16_t  dac_value 
)

Loads and updates the selected DAC with a given value.

Parameters
dev- The device structure.
channel- the chosen channel to write to. Example: AD5449_CH_A = 0; AD5449_CH_B = 1.
dac_value- desired value to be written in register.
Returns
None.

◆ ad5449_readback_channel()

uint16_t ad5449_readback_channel ( struct ad5449_dev dev,
uint8_t  channel 
)

Read from the selected DAC register.

Parameters
dev- The device structure.
channel- the chosen channel to read from. Example: AD5449_CH_A = 0; AD5449_CH_B = 1.
Returns
dac_value - value read from the register.

◆ ad5449_remove()

int32_t ad5449_remove ( struct ad5449_dev dev)

Free the resources allocated by ad5449_init().

Parameters
dev- The device structure.
Returns
0 in case of success, negative error code otherwise.

◆ ad5449_sclksetup()

void ad5449_sclksetup ( struct ad5449_dev dev,
int8_t  value 
)

Set up the active clock edge of the SPI interface.

Parameters
dev- The device structure.
value- target scale when making a clear command Example: AD5449_CLOCK_NEGEDGE = Falling edge. (Default) AD5449_CLOCK_POSEDGE = Rising edge.
Returns
None.

◆ ad5449_sdocontrol()

void ad5449_sdocontrol ( struct ad5449_dev dev,
int8_t  control_bits 
)

Control the SDO output driver strength. This function is supported by the devices : AD5415, AD5429, AD5439, AD5449.

Parameters
dev- The device structure.
control_bits- target scale when making a clear command Example: AD5449_SDO_FULL = Full SDO driver. AD5449_SDO_WEAK = Weak SDO driver. AD5449_SDO_OPEN_DRAIN = SDO configured as open drain AD5449_SDO_DISABLE = Disable SDO output
Returns
None.

◆ ad5449_set_input_shift_reg()

uint16_t ad5449_set_input_shift_reg ( struct ad5449_dev dev,
uint16_t  command,
uint16_t  data 
)

Write to input register and read from output register via SPI.

Parameters
dev- The device structure.
command- command control bits.
data- data to be written in input register.
Returns
readBack - value read from register.

◆ ad5449_update_all()

void ad5449_update_all ( struct ad5449_dev dev)

Update the DAC outputs. This function has a physical result just with devices with two channels.

Parameters
dev- The device structure.
Returns
None.