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incubator-nuttx/include/nuttx/analog/pga11x.h

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/****************************************************************************
* include/nuttx/analog/pga11x.h
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* "PGA112, PGA113, PGA116, PGA117: Zerø-Drift PROGRAMMABLE GAIN AMPLIFIER
* with MUX", SBOS424B, March 2008, Revised September 2008, Texas
* Instruments Incorporated"
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, 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.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_ANALOG_PGA11X_H
#define __INCLUDE_NUTTX_ANALOG_PGA11X_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/spi/spi.h>
#if defined(CONFIG_ADC) && defined(CONFIG_ADC_PGA11X)
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Prerequisites:
* CONFIG_ADC=y is needed to enable support for analog input devices
*
* CONFIG_ADC_PGA11X
* Enables support for the PGA11X driver (Needs CONFIG_ADC)
* CONFIG_PGA11X_SPIFREQUENCY
* SPI frequency. Default 1MHz
* CONFIG_PGA11X_DAISYCHAIN
* Use two PGA116/7's in Daisy Chain commands.
* CONFIG_PGA11X_SPIMODE
* SPI Mode. The specification says that the device operates in Mode 0 or
* Mode 3. But sometimes you need to tinker with this to get things to
* work correctly. Default: Mode 0
* CONFIG_PGA11X_MULTIPLE
* Can be defined to support multiple PGA11X devices on board. Each
* device will require a customized SPI interface to distinguish them
* When SPI_SELECT is called with devid=SPIDEV_MUX.
*
* Other settings that effect the driver:
* CONFIG_SPI_OWNBUS -- If the PGA117 is enabled, this must be set to 'y'
* if the PGA117 is the only device on the SPI bus;
* CONFIG_DEBUG_SPI -- With CONFIG_DEBUG and CONFIG_DEBUG_VERBOSE,
* this will enable debug output from the PGA117 driver.
*/
#ifndef CONFIG_PGA11X_SPIFREQUENCY
# define CONFIG_PGA11X_SPIFREQUENCY 1000000
#endif
#ifndef CONFIG_PGA11X_SPIMODE
# define CONFIG_PGA11X_SPIMODE SPIDEV_MODE0
#endif
/* PGA11x Commands **********************************************************/
/* Write command Gain Selection Bits (PGA112/PGA113)
*
* the PGA112 and PGA116 provide binary gain selections (1, 2, 4, 8, 16, 32,
* 64, 128); the PGA113 and PGA117 provide scope gain selections (1, 2, 5, 10,
* 20, 50, 100, 200).
*/
#define PGA11X_GAIN_1 (0) /* Gain=1: Scope Gain=1 */
#define PGA11X_GAIN_2 (1) /* Gain=2: Scope Gain=2 */
#define PGA11X_GAIN_4 (2) /* Gain=4: Scope Gain=5 */
#define PGA11X_GAIN_5 (2) /* Gain=4: Scope Gain=5 */
#define PGA11X_GAIN_8 (3) /* Gain=8: Scope Gain=10 */
#define PGA11X_GAIN_10 (3) /* Gain=8: Scope Gain=10 */
#define PGA11X_GAIN_16 (4) /* Gain=16: Scope Gain=20 */
#define PGA11X_GAIN_20 (4) /* Gain=16: Scope Gain=20 */
#define PGA11X_GAIN_32 (5) /* Gain=32: Scope Gain=50 */
#define PGA11X_GAIN_50 (5) /* Gain=32: Scope Gain=50 */
#define PGA11X_GAIN_64 (6) /* Gain=64: Scope Gain=100 */
#define PGA11X_GAIN_100 (6) /* Gain=64: Scope Gain=100 */
#define PGA11X_GAIN_128 (7) /* Gain=128: Scope Gain=200 */
#define PGA11X_GAIN_200 (7) /* Gain=128: Scope Gain=200 */
/* Write command Mux Channel Selection Bits
*
* The PGA112/PGA113 have a two-channel input MUX; the PGA116/PGA117 have a
* 10-channel input MUX.
*/
#define PGA11X_CHAN_VCAL (0) /* VCAL/CH0 */
#define PGA11X_CHAN_CH0 (0) /* VCAL/CH0 */
#define PGA11X_CHAN_CH1 (1) /* CH1 */
#define PGA11X_CHAN_CH2 (2) /* CH2 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH3 (3) /* CH3 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH4 (4) /* CH4 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH5 (5) /* CH5 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH6 (6) /* CH6 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH7 (7) /* CH7 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH8 (8) /* CH8 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CH9 (9) /* CH9 (PGA116/PGA117 only) */
#define PGA11X_CHAN_CAL1 (12) /* CAL1: connects to GND */
#define PGA11X_CHAN_CAL2 (13) /* CAL2: connects to 0.9VCAL */
#define PGA11X_CHAN_CAL3 (14) /* CAL3: connects to 0.1VCAL */
#define PGA11X_CHAN_CAL4 (15) /* CAL4: connects to VREF */
/****************************************************************************
* Public Types
****************************************************************************/
/* Handle used to reference the particular PGA11X instance */
typedef FAR void *PGA11X_HANDLE;
/* Settings for one device in a daisy-chain */
#ifdef CONFIG_PGA11X_DAISYCHAIN
struct pga11x_usettings_s
{
uint8_t channel; /* See PGA11X_CHAN_* definitions */
uint8_t gain; /* See PGA11X_GAIN_* definitions */
};
#endif
/* These structures are used to encode gain and channel settings. This
* includes both devices in the case of a daisy-chained configuration.
* NOTE: This this logic is currently limited to only 2 devices in the
* daisy-chain.
*/
struct pga11x_settings_s
{
#ifndef CONFIG_PGA11X_DAISYCHAIN
uint8_t channel; /* See PGA11X_CHAN_* definitions */
uint8_t gain; /* See PGA11X_GAIN_* definitions */
#else
struct
{
uint8_t channel; /* See PGA11X_CHAN_* definitions */
uint8_t gain; /* See PGA11X_GAIN_* definitions */
} u1;
struct
{
uint8_t channel; /* See PGA11X_CHAN_* definitions */
uint8_t gain; /* See PGA11X_GAIN_* definitions */
} u2;
#endif
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: pga11x_initialize
*
* Description:
* Initialize the PGA117 amplifier/multiplexer(s).
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
*
* Returned Value:
* On success, a non-NULL opaque handle is returned; a NULL is returned
* on any failure. This handle may be used with the other PGA117 interface
* functions to control the multiplexer
*
****************************************************************************/
EXTERN PGA11X_HANDLE pga11x_initialize(FAR struct spi_dev_s *spi);
/****************************************************************************
* Name: pga11x_select
*
* Description:
* Select an input channel and gain for all PGA11xs.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_select() configures
* both chips in the daisy-chain. pga11x_uselect() is provided to support
* configuring the parts in the daisychain independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
* settings - New channel and gain settings
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
EXTERN int pga11x_select(PGA11X_HANDLE handle,
FAR const struct pga11x_settings_s *settings);
/****************************************************************************
* Name: pga11x_uselect
*
* Description:
* Select an input channel and gain for one PGA11x.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_uselect() configures
* one chips in the daisy-chain.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
* pos - Position of the chip in the daisy chain (0 or 1)
* settings - New channel and gain settings
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
#ifdef CONFIG_PGA11X_DAISYCHAIN
EXTERN int pga11x_uselect(PGA11X_HANDLE handle, int pos,
FAR const struct pga11x_usettings_s *settings);
#endif
/****************************************************************************
* Name: pga11x_read
*
* Description:
* Read from all PGA117 amplifier/multiplexers.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_read() reads from
* both chips in the daisy-chain. pga11x_uread() is provided to support
* accessing the parts independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
* settings - Returned channel and gain settings
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
EXTERN int pga11x_read(PGA11X_HANDLE handle,
FAR struct pga11x_settings_s *settings);
/****************************************************************************
* Name: pga11x_uread
*
* Description:
* Read from one PGA117 amplifier/multiplexer.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_read() reads
* the parts independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
* pos - Position of the chip in the daisy chain (0 or 1)
* settings - Returned channel and gain settings
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
#ifdef CONFIG_PGA11X_DAISYCHAIN
EXTERN int pga11x_uread(PGA11X_HANDLE handle, int pos,
FAR struct pga11x_usettings_s *settings);
#endif
/****************************************************************************
* Name: pga11x_shutdown
*
* Description:
* Put all PGA11x;'s in shutdown down mode.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_shutdown() controls
* both chips in the daisy-chain. pga11x_ushutdown() is provided to
* control the parts independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
EXTERN int pga11x_shutdown(PGA11X_HANDLE handle);
/****************************************************************************
* Name: pga11x_ushutdown
*
* Description:
* Put one PGA11x in shutdown down mode.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_ushutdown() is
* provided to shutdown the parts independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
* pos - Position of the chip in the daisy chain (0 or 1)
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
#ifdef CONFIG_PGA11X_DAISYCHAIN
EXTERN int pga11x_ushutdown(PGA11X_HANDLE handle, int pos);
#endif
/****************************************************************************
* Name: pga11x_enable
*
* Description:
* Take all PGA11x's out of shutdown down mode.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_enable() controls
* both chips in the daisy-chain. pga11x_uenable() is provided to
* control the parts independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
EXTERN int pga11x_enable(PGA11X_HANDLE handle);
/****************************************************************************
* Name: pga11x_uenable
*
* Description:
* Take one PGA11x out of shutdown down mode.
*
* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_uenable() is
* provided to enable the parts independently.
*
* Input Parameters:
* spi - An SPI "bottom half" device driver instance
* pos - Position of the chip in the daisy chain (0 or 1)
*
* Returned Value:
* Zero on sucess; a negated errno value on failure.
*
****************************************************************************/
#ifdef CONFIG_PGA11X_DAISYCHAIN
EXTERN int pga11x_uenable(PGA11X_HANDLE handle, int pos);
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_ADC && CONFIG_ADC_PGA11X */
#endif /* __INCLUDE_NUTTX_ANALOG_PGA11X_H */
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