794 lines
23 KiB
C
794 lines
23 KiB
C
/****************************************************************************
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* drivers/analog/pga11x.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* References:
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* "PGA112, PGA113, PGA116, PGA117: Zerø-Drift PROGRAMMABLE GAIN AMPLIFIER
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* with MUX", SBOS424B, March 2008, Revised September 2008, Texas
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* Instruments Incorporated"
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/analog/pga11x.h>
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#if defined(CONFIG_ADC) && defined(CONFIG_ADC_PGA11X)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The PGA112/PGA113 have a three-wire SPI digital interface; the
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* PGA116/PGA117 have a four-wire SPI digital interface. The PGA116/117 also
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* have daisy-chain capability (The PGA112/PGA113 can be used as the last device
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* in a daisy-chain as shown if write-only communication is acceptable).
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*/
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/* PGA11x commands (PGA112/PGA113) */
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#define PGA11X_CMD_READ 0x6a00
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#define PGA11X_CMD_WRITE 0x2a00
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#define PGA11X_CMD_NOOP 0x0000
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#define PGA11X_CMD_SDN_DIS 0xe100
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#define PGA11X_CMD_SDN_EN 0xe1f1
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/* SPI Daisy-Chain Commands (PGA116/PGA117) */
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#define PGA11X_DCCMD_SELECTOR 0x8000
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#define PGA11X_DCCMD_NOOP (PGA11X_DCCMD_SELECTOR | PGA11X_CMD_NOOP)
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#define PGA11X_DCCMD_SDN_DIS (PGA11X_DCCMD_SELECTOR | PGA11X_CMD_SDN_DIS)
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#define PGA11X_DCCMD_SDN_EN (PGA11X_DCCMD_SELECTOR | PGA11X_CMD_SDN_EN)
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#define PGA11X_DCCMD_READ (PGA11X_DCCMD_SELECTOR | PGA11X_CMD_READ)
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#define PGA11X_DCCMD_WRITE (PGA11X_DCCMD_SELECTOR | PGA11X_CMD_WRITE)
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/* Write command Gain Selection Bits (PGA112/PGA113)
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*
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* the PGA112 and PGA116 provide binary gain selections (1, 2, 4, 8, 16, 32,
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* 64, 128); the PGA113 and PGA117 provide scope gain selections (1, 2, 5, 10,
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* 20, 50, 100, 200).
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*/
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#define PGA11X_GAIN_SHIFT (4) /* Bits 4-7: Gain Selection Bits */
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#define PGA11X_GAIN_MASK (15 << PGA11X_GAIN_SHIFT)
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/* Write command Mux Channel Selection Bits
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*
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* The PGA112/PGA113 have a two-channel input MUX; the PGA116/PGA117 have a
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* 10-channel input MUX.
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*/
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#define PGA11X_CHAN_SHIFT (0) /* Bits 0-3: Channel Selection Bits */
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#define PGA11X_CHAN_MASK (15 << PGA11X_CHAN_SHIFT)
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/* Other definitions ********************************************************/
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#define SPI_DUMMY 0xff
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/* Debug ********************************************************************/
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/* Check if (non-standard) SPI debug is enabled */
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#ifndef CONFIG_DEBUG
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# undef CONFIG_DEBUG_VERBOSE
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# undef CONFIG_DEBUG_SPI
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#endif
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#ifdef CONFIG_DEBUG_SPI
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# define spidbg dbg
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# ifdef CONFIG_DEBUG_VERBOSE
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# define spivdbg dbg
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# else
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# define spivdbg(x...)
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# endif
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#else
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# define spidbg(x...)
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# define spivdbg(x...)
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pga11x_configure
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*
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* Description:
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* Configure the SPI bus as needed for the PGA11x device.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void pga11x_configure(FAR struct spi_dev_s *spi)
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{
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spivdbg("MODE: %d BITS: 8 Frequency: %d\n",
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CONFIG_PGA11X_SPIMODE, CONFIG_PGA11X_SPIFREQUENCY);
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/* Call the setfrequency, setbits, and setmode methods to make sure that
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* the SPI is properly configured for the device.
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*/
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SPI_SETMODE(spi, CONFIG_PGA11X_SPIMODE);
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SPI_SETBITS(spi, 8);
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(void)SPI_SETFREQUENCY(spi, CONFIG_PGA11X_SPIFREQUENCY);
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}
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/****************************************************************************
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* Name: pga11x_lock
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*
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* Description:
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* Lock the SPI bus and configure it as needed for the PGA11x device.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifndef CONFIG_SPI_OWNBUS
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static void pga11x_lock(FAR struct spi_dev_s *spi)
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{
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spivdbg("Locking\n");
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/* On SPI busses where there are multiple devices, it will be necessary to
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* lock SPI to have exclusive access to the busses for a sequence of
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* transfers. The bus should be locked before the chip is selected.
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*
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* This is a blocking call and will not return until we have exclusiv access to
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* the SPI buss. We will retain that exclusive access until the bus is unlocked.
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*/
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SPI_LOCK(spi, true);
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/* After locking the SPI bus, the we also need call the setfrequency, setbits, and
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* setmode methods to make sure that the SPI is properly configured for the device.
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* If the SPI buss is being shared, then it may have been left in an incompatible
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* state.
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*/
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pga11x_configure(spi);
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}
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#else
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# define pga11x_lock(spi)
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#endif
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/****************************************************************************
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* Name: pga11x_unlock
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*
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* Description:
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* Lock the SPI bus and configure it as needed for the PGA11x device.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifndef CONFIG_SPI_OWNBUS
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static inline void pga11x_unlock(FAR struct spi_dev_s *spi)
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{
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spivdbg("Unlocking\n");
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SPI_LOCK(spi, false);
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}
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#else
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# define pga11x_unlock(spi)
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#endif
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/****************************************************************************
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* Name: pga11x_send16
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*
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* Description:
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* Send 16 bits of data, ignoring any returned data
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*
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* Input Parameters:
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* spi - PGA11X driver instance
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* word - The data to send
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The bus is locked and the device is selected
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*
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****************************************************************************/
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static void pga11x_send16(FAR struct spi_dev_s *spi, uint16_t word)
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{
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spivdbg("Send %04x\n", word);
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/* The logical interface is 16-bits wide. However, this driver uses a
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* 8-bit configuration for greaer portability.
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*
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* Send the MS byte first. Then the LS byte.
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*/
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SPI_SEND(spi, word >> 8);
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SPI_SEND(spi, word & 0xff);
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}
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/****************************************************************************
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* Name: pga11x_recv16
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*
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* Description:
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* Receive 16 bits of data.
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*
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* Input Parameters:
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* spi - PGA11X driver instance
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*
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* Returned Value:
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* The received 16-bit value
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*
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* Assumptions:
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* The bus is locked and the device is selected
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*
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****************************************************************************/
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static uint16_t pga11x_recv16(FAR struct spi_dev_s *spi)
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{
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uint8_t msb;
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uint8_t lsb;
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/* The logical interface is 16-bits wide. However, this driver uses a
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* 8-bit configuration for greaer portability.
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*
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* Send a dummy byte and receive MS byte first. Then the LS byte.
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*/
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msb = SPI_SEND(spi, SPI_DUMMY);
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lsb = SPI_SEND(spi, SPI_DUMMY);
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spivdbg("Received %02x %02x\n", msb, lsb);
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return ((uint16_t)msb << 8) | (uint16_t)lsb;
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}
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/****************************************************************************
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* Name: pga11x_write
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*
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* Description:
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* Send a 16-bit command.
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*
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* Input Parameters:
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* spi - PGA11X driver instance
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* cmd - PGA11X command (non-daisy chained)
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* u1cmd - PGA11X U1 command (daisy chained)
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* u2cmd - PGA11X U2 command (daisy chained)
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*
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* Returned Value:
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* The received 16-bit value
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*
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* Assumptions:
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* The device is NOT selected and the NOT bus is locked.
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*
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****************************************************************************/
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#ifndef CONFIG_PGA11X_DAISYCHAIN
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static void pga11x_write(FAR struct spi_dev_s *spi, uint16_t cmd)
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{
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spivdbg("cmd %04x\n", cmd);
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/* Lock, select, send the 16-bit command, de-select, and un-lock. */
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pga11x_lock(spi);
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SPI_SELECT(spi, SPIDEV_MUX, true);
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pga11x_send16(spi, cmd);
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SPI_SELECT(spi, SPIDEV_MUX, false);
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pga11x_unlock(spi);
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}
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#else
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static void pga11x_write(FAR struct spi_dev_s *spi, uint16_t u1cmd, uint16_t u2cmd)
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{
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spivdbg("U1 cmd: %04x U2 cmd: %04x\n", u1cmd, u2cmd);
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/* Lock, select, send the U2 16-bit command, the U1 16-bit command, de-select,
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* and un-lock.
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*/
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pga11x_lock(spi);
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SPI_SELECT(spi, SPIDEV_MUX, true);
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pga11x_send16(spi, u2cmd);
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pga11x_send16(spi, u1cmd);
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SPI_SELECT(spi, SPIDEV_MUX, false);
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pga11x_unlock(spi);
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pga11x_initialize
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*
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* Description:
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* Initialize the PGA117 amplifier/multiplexer(s).
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*
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* Input Parameters:
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* spi - An SPI "bottom half" device driver instance
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*
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* Returned Value:
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* On success, a non-NULL opaque handle is returned; a NULL is returned
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* on any failure. This handle may be used with the other PGA117 interface
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* functions to control the multiplexer
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*
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****************************************************************************/
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PGA11X_HANDLE pga11x_initialize(FAR struct spi_dev_s *spi)
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{
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spivdbg("Entry\n");
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/* Configure the SPI us for the device. Do this now only if the PGA11X is
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* the only device on the bus.
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*/
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#ifdef CONFIG_SPI_OWNBUS
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pga11x_configure(spi);
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#endif
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/* No other special state is required, just return the SPI driver instance
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* as the handle. This gives us a place to extend functionality in the
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* future if neccessary.
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*/
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return (PGA11X_HANDLE)spi;
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}
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/****************************************************************************
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* Name: pga11x_select
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*
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* Description:
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* Select an input channel and gain for all PGA11xs.
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*
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* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_select() configures
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* both chips in the daisy-chain. pga11x_uselect() is provided to support
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* configuring the parts in the daisychain independently.
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*
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* Input Parameters:
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* spi - An SPI "bottom half" device driver instance
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* settings - New channel and gain settings
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*
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* Returned Value:
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* Zero on sucess; a negated errno value on failure.
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*
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****************************************************************************/
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int pga11x_select(PGA11X_HANDLE handle,
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FAR const struct pga11x_settings_s *settings)
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{
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#ifndef CONFIG_PGA11X_DAISYCHAIN
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FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
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uint16_t cmd;
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DEBUGASSERT(handle && settings);
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spivdbg("channel: %d gain: %d\n", settings->channel, settings->gain);
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/* Format the command */
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cmd = PGA11X_CMD_WRITE |
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((uint16_t)settings->channel << PGA11X_CHAN_SHIFT) |
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((uint16_t)settings->gain << PGA11X_GAIN_SHIFT);
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/* Send the command */
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pga11x_write(spi, cmd);
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return OK;
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#else
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FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
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uint16_t u1cmd;
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uint16_t u2cmd;
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DEBUGASSERT(handle && settings);
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spivdbg("U1 channel: %d gain: %d\n", settings->u1.channel, settings->u1.gain);
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spivdbg("U1 channel: %d gain: %d\n", settings->u1.channel, settings->u1.gain);
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/* Format the commands */
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u1cmd = PGA11X_CMD_WRITE |
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((uint16_t)settings->u1.channel << PGA11X_CHAN_SHIFT) |
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((uint16_t)settings->u1.gain << PGA11X_GAIN_SHIFT);
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u2cmd = PGA11X_DCCMD_WRITE |
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((uint16_t)settings->u2.channel << PGA11X_CHAN_SHIFT) |
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((uint16_t)settings->u2.gain << PGA11X_GAIN_SHIFT);
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/* Send the command */
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pga11x_write(spi, u1cmd, u2cmd);
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return OK;
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#endif
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}
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/****************************************************************************
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* Name: pga11x_uselect
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*
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* Description:
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* Select an input channel and gain for one PGA11x.
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*
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* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_uselect() configures
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* one chips in the daisy-chain.
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*
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* Input Parameters:
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* spi - An SPI "bottom half" device driver instance
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* pos - Position of the chip in the daisy chain (0 or 1)
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* settings - New channel and gain settings
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*
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* Returned Value:
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* Zero on sucess; a negated errno value on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_PGA11X_DAISYCHAIN
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int pga11x_uselect(PGA11X_HANDLE handle, int pos,
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FAR const struct pga11x_usettings_s *settings)
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{
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FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
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uint16_t u1cmd;
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uint16_t u2cmd;
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spivdbg("channel: %d gain: %d\n", settings->channel, settings->gain);
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DEBUGASSERT(handle);
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/* Format the commands */
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if (pos == 0)
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{
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u1cmd = PGA11X_CMD_WRITE |
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((uint16_t)settings->channel << PGA11X_CHAN_SHIFT) |
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((uint16_t)settings->gain << PGA11X_GAIN_SHIFT);
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u2cmd = PGA11X_DCCMD_NOOP;
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}
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else /* if (pos == 1) */
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{
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u1cmd = PGA11X_CMD_NOOP;
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u2cmd = PGA11X_DCCMD_WRITE |
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((uint16_t)settings->channel << PGA11X_CHAN_SHIFT) |
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((uint16_t)settings->gain << PGA11X_GAIN_SHIFT);
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}
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/* Send the command */
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pga11x_write(spi, u1cmd, u2cmd);
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return OK;
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}
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#endif
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/****************************************************************************
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* Name: pga11x_read
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*
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* Description:
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* Read from all PGA117 amplifier/multiplexers.
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*
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* If CONFIG_PGA11X_DAISYCHAIN is defined, then pga11x_read() reads from
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* both chips in the daisy-chain. pga11x_uread() is provided to support
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* accessing the parts independently.
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*
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* Input Parameters:
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* spi - An SPI "bottom half" device driver instance
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* settings - Returned channel and gain settings
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*
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* Returned Value:
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* Zero on sucess; a negated errno value on failure.
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*
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****************************************************************************/
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int pga11x_read(PGA11X_HANDLE handle, FAR struct pga11x_settings_s *settings)
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{
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#ifdef CONFIG_PGA11X_DAISYCHAIN
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FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
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uint16_t u1value;
|
|
uint16_t u2value;
|
|
|
|
spivdbg("Entry\n");
|
|
DEBUGASSERT(handle && settings);
|
|
|
|
/* Lock the bus and read the configuration */
|
|
|
|
pga11x_lock(spi);
|
|
|
|
/* Select, send the 16-bit command, the 16-bit daisy-chain command, and
|
|
* then de-select the part. I do not know if de-selection between word
|
|
* transfers is required. However, it is shown in the timing diagrams
|
|
* for the part.
|
|
*/
|
|
|
|
SPI_SELECT(spi, SPIDEV_MUX, true);
|
|
pga11x_send16(spi, PGA11X_CMD_READ);
|
|
pga11x_send16(spi, PGA11X_DCCMD_READ);
|
|
SPI_SELECT(spi, SPIDEV_MUX, false);
|
|
|
|
/* Re-select, get the returned values, de-select, and unlock */
|
|
|
|
SPI_SELECT(spi, SPIDEV_MUX, true);
|
|
u2value = pga11x_recv16(spi);
|
|
u1value = pga11x_recv16(spi);
|
|
SPI_SELECT(spi, SPIDEV_MUX, false);
|
|
pga11x_unlock(spi);
|
|
|
|
/* Decode the returned value */
|
|
|
|
spivdbg("Returning %04x %04x\n", u2value, u1value);
|
|
settings->u1.channel = (uint8_t)((u1value & PGA11X_CHAN_MASK) >> PGA11X_CHAN_SHIFT);
|
|
settings->u1.gain = (uint8_t)((u1value & PGA11X_GAIN_MASK) >> PGA11X_GAIN_SHIFT);
|
|
settings->u2.channel = (uint8_t)((u2value & PGA11X_CHAN_MASK) >> PGA11X_CHAN_SHIFT);
|
|
settings->u2.gain = (uint8_t)((u2value & PGA11X_GAIN_MASK) >> PGA11X_GAIN_SHIFT);
|
|
return OK;
|
|
#else
|
|
FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
|
|
uint16_t value;
|
|
|
|
spivdbg("Entry\n");
|
|
DEBUGASSERT(handle);
|
|
|
|
/* Lock the bus and read the configuration */
|
|
|
|
pga11x_lock(spi);
|
|
|
|
/* Select, send the 16-bit PGA11X_CMD_READ command, and de-select. I do
|
|
* not know if de-selection between word transfers is required. However,
|
|
* it is shown in the timing diagrams for the part.
|
|
*/
|
|
|
|
SPI_SELECT(spi, SPIDEV_MUX, true);
|
|
pga11x_send16(spi, PGA11X_CMD_READ);
|
|
SPI_SELECT(spi, SPIDEV_MUX, false);
|
|
|
|
/* Re-select, get the returned value, de-select, and unlock */
|
|
|
|
SPI_SELECT(spi, SPIDEV_MUX, true);
|
|
value = pga11x_recv16(spi);
|
|
SPI_SELECT(spi, SPIDEV_MUX, false);
|
|
pga11x_unlock(spi);
|
|
|
|
/* Decode the returned value */
|
|
|
|
spivdbg("Returning: %04x\n", value);
|
|
settings->channel = (uint8_t)((value & PGA11X_CHAN_MASK) >> PGA11X_CHAN_SHIFT);
|
|
settings->gain = (uint8_t)((value & PGA11X_GAIN_MASK) >> PGA11X_GAIN_SHIFT);
|
|
return OK;
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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
|
|
int pga11x_uread(PGA11X_HANDLE handle, int pos,
|
|
FAR struct pga11x_usettings_s *settings)
|
|
{
|
|
struct pga11x_settings_s both;
|
|
int ret = pga11x_read(handle, &both);
|
|
if (ret == OK)
|
|
{
|
|
if (pos == 0)
|
|
{
|
|
settings->channel = both.u1.channel;
|
|
settings->gain = both.u1.gain;
|
|
}
|
|
else /* if (pos == 1) */
|
|
{
|
|
settings->channel = both.u2.channel;
|
|
settings->gain = both.u2.gain;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int pga11x_shutdown(PGA11X_HANDLE handle)
|
|
{
|
|
FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
|
|
|
|
spivdbg("Entry\n");
|
|
DEBUGASSERT(handle);
|
|
|
|
/* Enter shutdown mode by issuing an SDN_EN command */
|
|
|
|
#ifdef CONFIG_PGA11X_DAISYCHAIN
|
|
pga11x_write(spi, PGA11X_CMD_SDN_EN, PGA11X_DCCMD_SDN_EN);
|
|
#else
|
|
pga11x_write(spi, PGA11X_CMD_SDN_EN);
|
|
#endif
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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
|
|
int pga11x_ushutdown(PGA11X_HANDLE handle, int pos)
|
|
{
|
|
FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
|
|
|
|
spivdbg("Entry\n");
|
|
DEBUGASSERT(handle);
|
|
|
|
/* Enter shutdown mode by issuing an SDN_EN command */
|
|
|
|
if (pos == 0)
|
|
{
|
|
pga11x_write(spi, PGA11X_CMD_SDN_EN, PGA11X_DCCMD_NOOP);
|
|
}
|
|
else
|
|
{
|
|
pga11x_write(spi, PGA11X_CMD_NOOP, PGA11X_DCCMD_SDN_EN);
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
#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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int pga11x_enable(PGA11X_HANDLE handle)
|
|
{
|
|
FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
|
|
|
|
spivdbg("Entry\n");
|
|
DEBUGASSERT(handle);
|
|
|
|
/* Lock the bus and send the shutdown disable command. Shutdown mode is
|
|
* cleared (returned to the last valid write configuration) by the SDN_DIS
|
|
* command or by any valid Write command
|
|
*/
|
|
|
|
#ifdef CONFIG_PGA11X_DAISYCHAIN
|
|
pga11x_write(spi, PGA11X_CMD_SDN_DIS, PGA11X_DCCMD_SDN_DIS);
|
|
#else
|
|
pga11x_write(spi, PGA11X_CMD_SDN_DIS);
|
|
#endif
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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
|
|
int pga11x_uenable(PGA11X_HANDLE handle, int pos)
|
|
{
|
|
FAR struct spi_dev_s *spi = (FAR struct spi_dev_s *)handle;
|
|
|
|
spivdbg("Entry\n");
|
|
DEBUGASSERT(handle);
|
|
|
|
/* Enter shutdown mode by issuing an SDN_EN command */
|
|
|
|
if (pos == 0)
|
|
{
|
|
pga11x_write(spi, PGA11X_CMD_SDN_DIS, PGA11X_DCCMD_NOOP);
|
|
}
|
|
else
|
|
{
|
|
pga11x_write(spi, PGA11X_CMD_NOOP, PGA11X_DCCMD_SDN_DIS);
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_ADC && CONFIG_ADC_PGA11X */
|
|
|