/**************************************************************************** * drivers/sensors/adxl345_spi.c * * Copyright (C) 2014 Alan Carvalho de Assis. All rights reserved. * Author: Alan Carvalho de Assis * Based on STME811 driver * Author: Gregory Nutt * * 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include "adxl345.h" #if defined(CONFIG_SENSORS_ADXL345) && defined(CONFIG_ADXL345_SPI) /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: adxl345_configspi * * Description: * ****************************************************************************/ static inline void adxl345_configspi(FAR struct spi_dev_s *spi) { /* Configure SPI for the ADXL345 */ SPI_SETMODE(spi, SPIDEV_MODE3); SPI_SETBITS(spi, 8); SPI_HWFEATURES(spi, 0); SPI_SETFREQUENCY(spi, ADXL345_SPI_MAXFREQUENCY); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: adxl345_getreg8 * * Description: * Read from an 8-bit ADXL345 register * ****************************************************************************/ uint8_t adxl345_getreg8(FAR struct adxl345_dev_s *priv, uint8_t regaddr) { uint8_t regval; /* If SPI bus is shared then lock and configure it */ SPI_LOCK(priv->spi, true); adxl345_configspi(priv->spi); /* Select the ADXL345 */ SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), true); /* Send register to read and get the next byte */ SPI_SEND(priv->spi, regaddr); SPI_RECVBLOCK(priv->spi, ®val, 1); /* Deselect the ADXL345 */ SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), false); /* Unlock bus */ SPI_LOCK(priv->spi, false); #ifdef CONFIG_ADXL345_REGDEBUG _err("%02x->%02x\n", regaddr, regval); #endif return regval; } /**************************************************************************** * Name: adxl345_putreg8 * * Description: * Write a value to an 8-bit ADXL345 register * ****************************************************************************/ void adxl345_putreg8(FAR struct adxl345_dev_s *priv, uint8_t regaddr, uint8_t regval) { #ifdef CONFIG_ADXL345_REGDEBUG _err("%02x<-%02x\n", regaddr, regval); #endif /* If SPI bus is shared then lock and configure it */ SPI_LOCK(priv->spi, true); adxl345_configspi(priv->spi); /* Select the ADXL345 */ SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), true); /* Send register address and set the value */ SPI_SEND(priv->spi, regaddr); SPI_SEND(priv->spi, regval); /* Deselect the ADXL345 */ SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), false); /* Unlock bus */ SPI_LOCK(priv->spi, false); } /**************************************************************************** * Name: adxl345_getreg16 * * Description: * Read 16-bits of data from an ADXL345 register * ****************************************************************************/ uint16_t adxl345_getreg16(FAR struct adxl345_dev_s *priv, uint8_t regaddr) { uint16_t regval; /* If SPI bus is shared then lock and configure it */ SPI_LOCK(priv->spi, true); adxl345_configspi(priv->spi); /* Select the ADXL345 */ SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), true); /* Send register to read and get the next 2 bytes */ SPI_SEND(priv->spi, regaddr); SPI_RECVBLOCK(priv->spi, ®val, 2); /* Deselect the ADXL345 */ SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), false); /* Unlock bus */ SPI_LOCK(priv->spi, false); #ifdef CONFIG_ADXL345_REGDEBUG _err("%02x->%04x\n", regaddr, regval); #endif return regval; } #endif /* CONFIG_SENSORS_ADXL345 && CONFIG_ADXL345_SPI*/