212 lines
6.0 KiB
C
212 lines
6.0 KiB
C
/****************************************************************************
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* drivers/sensors/adxl345_spi.c
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*
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* Copyright (C) 2014 Alan Carvalho de Assis. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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* Based on STME811 driver
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <unistd.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/sensors/adxl345.h>
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#include "adxl345.h"
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#if defined(CONFIG_SENSORS_ADXL345) && defined(CONFIG_ADXL345_SPI)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: adxl345_configspi
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*
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* Description:
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*
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****************************************************************************/
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#ifndef CONFIG_SPI_OWNBUS
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static inline void adxl345_configspi(FAR struct spi_dev_s *spi)
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{
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/* Configure SPI for the ADXL345 */
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SPI_SETMODE(spi, SPIDEV_MODE3);
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SPI_SETBITS(spi, 8);
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SPI_SETFREQUENCY(spi, ADXL345_SPI_MAXFREQUENCY);
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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: adxl345_getreg8
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*
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* Description:
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* Read from an 8-bit ADXL345 register
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*
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****************************************************************************/
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uint8_t adxl345_getreg8(FAR struct adxl345_dev_s *priv, uint8_t regaddr)
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{
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uint8_t regval;
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/* If SPI bus is shared then lock and configure it */
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#ifndef CONFIG_SPI_OWNBUS
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(void)SPI_LOCK(priv->spi, true);
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adxl345_configspi(priv->spi);
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#endif
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/* Select the ADXL345 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER, true);
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/* Send register to read and get the next byte */
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(void)SPI_SEND(priv->spi, regaddr);
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SPI_RECVBLOCK(priv->spi, ®val, 1);
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/* Deselect the ADXL345 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER, false);
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/* Unlock bus */
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#ifndef CONFIG_SPI_OWNBUS
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(void)SPI_LOCK(priv->spi, false);
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#endif
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#ifdef CONFIG_ADXL345_REGDEBUG
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dbg("%02x->%02x\n", regaddr, regval);
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#endif
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return regval;
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}
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/****************************************************************************
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* Name: adxl345_putreg8
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*
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* Description:
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* Write a value to an 8-bit ADXL345 register
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*
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****************************************************************************/
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void adxl345_putreg8(FAR struct adxl345_dev_s *priv, uint8_t regaddr,
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uint8_t regval)
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{
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#ifdef CONFIG_ADXL345_REGDEBUG
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dbg("%02x<-%02x\n", regaddr, regval);
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#endif
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/* If SPI bus is shared then lock and configure it */
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#ifndef CONFIG_SPI_OWNBUS
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(void)SPI_LOCK(priv->spi, true);
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adxl345_configspi(priv->spi);
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#endif
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/* Select the ADXL345 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER, true);
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/* Send register address and set the value */
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(void)SPI_SEND(priv->spi, regaddr);
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(void)SPI_SEND(priv->spi, regval);
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/* Deselect the ADXL345 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER, false);
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/* Unlock bus */
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#ifndef CONFIG_SPI_OWNBUS
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(void)SPI_LOCK(priv->spi, false);
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#endif
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}
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/****************************************************************************
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* Name: adxl345_getreg16
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*
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* Description:
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* Read 16-bits of data from an ADXL345 register
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*
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****************************************************************************/
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uint16_t adxl345_getreg16(FAR struct adxl345_dev_s *priv, uint8_t regaddr)
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{
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uint16_t regval;
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/* If SPI bus is shared then lock and configure it */
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#ifndef CONFIG_SPI_OWNBUS
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(void)SPI_LOCK(priv->spi, true);
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adxl345_configspi(priv->spi);
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#endif
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/* Select the ADXL345 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER, true);
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/* Send register to read and get the next 2 bytes */
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(void)SPI_SEND(priv->spi, regaddr);
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SPI_RECVBLOCK(priv->spi, ®val, 2);
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/* Deselect the ADXL345 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER, false);
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/* Unlock bus */
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#ifndef CONFIG_SPI_OWNBUS
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(void)SPI_LOCK(priv->spi, false);
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#endif
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#ifdef CONFIG_ADXL345_REGDEBUG
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dbg("%02x->%04x\n", regaddr, regval);
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#endif
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return regval;
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}
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#endif /* CONFIG_SENSORS_ADXL345 && CONFIG_ADXL345_SPI*/
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