223 lines
7.7 KiB
C
223 lines
7.7 KiB
C
/****************************************************************************
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* drivers/sensors/adxl345_i2c.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/i2c/i2c_master.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)
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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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#ifdef CONFIG_ADXL345_I2C
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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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/* 8-bit data read sequence:
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*
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* Start - I2C_Write_Address - ADXL345_Reg_Address -
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* Repeated_Start - I2C_Read_Address - ADXL345_Read_Data - STOP
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*/
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struct i2c_msg_s msg[2];
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uint8_t regval;
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int ret;
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/* Setup 8-bit ADXL345 address write message */
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msg[0].frequency = priv->config->frequency; /* I2C frequency */
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msg[0].addr = priv->config->address; /* 7-bit address */
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msg[0].flags = 0; /* Write transaction, beginning with START */
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msg[0].buffer = ®addr; /* Transfer from this address */
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msg[0].length = 1; /* Send one byte following the address
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* (no STOP) */
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/* Set up the 8-bit ADXL345 data read message */
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msg[1].frequency = priv->config->frequency; /* I2C frequency */
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msg[1].addr = priv->config->address; /* 7-bit address */
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msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
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msg[1].buffer = ®val; /* Transfer to this address */
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msg[1].length = 1; /* Receive one byte following the address
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* (then STOP) */
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/* Perform the transfer */
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ret = I2C_TRANSFER(priv->i2c, msg, 2);
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if (ret < 0)
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{
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snerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return 0;
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}
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#ifdef CONFIG_ADXL345_REGDEBUG
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_err("%02x->%02x\n", regaddr, regval);
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#endif
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return regval;
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}
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#endif
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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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#ifdef CONFIG_ADXL345_I2C
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void adxl345_putreg8(FAR struct adxl345_dev_s *priv,
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uint8_t regaddr, uint8_t regval)
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{
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/* 8-bit data read sequence:
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*
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* Start - I2C_Write_Address - ADXL345_Reg_Address - ADXL345_Write_Data - STOP
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*/
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struct i2c_msg_s msg;
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uint8_t txbuffer[2];
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int ret;
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#ifdef CONFIG_ADXL345_REGDEBUG
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_err("%02x<-%02x\n", regaddr, regval);
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#endif
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/* Setup to the data to be transferred. Two bytes: The ADXL345 register
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* address followed by one byte of data.
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*/
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txbuffer[0] = regaddr;
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txbuffer[1] = regval;
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/* Setup 8-bit ADXL345 address write message */
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msg.frequency = priv->config->frequency; /* I2C frequency */
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msg.addr = priv->config->address; /* 7-bit address */
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msg.flags = 0; /* Write transaction, beginning with START */
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msg.buffer = txbuffer; /* Transfer from this address */
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msg.length = 2; /* Send two byte following the address
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* (then STOP) */
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/* Perform the transfer */
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ret = I2C_TRANSFER(priv->i2c, &msg, 1);
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if (ret < 0)
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{
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snerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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}
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}
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#endif
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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 STMPE-11 register
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*
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****************************************************************************/
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#ifdef CONFIG_ADXL345_I2C
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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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/* 16-bit data read sequence:
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*
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* Start - I2C_Write_Address - ADXL345_Reg_Address -
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* Repeated_Start - I2C_Read_Address - ADXL345_Read_Data_1 -
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* ADXL345_Read_Data_2 - STOP
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*/
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struct i2c_msg_s msg[2];
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uint8_t rxbuffer[2];
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int ret;
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/* Setup 8-bit ADXL345 address write message */
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msg[0].frequency = priv->config->frequency; /* I2C frequency */
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msg[0].addr = priv->config->address; /* 7-bit address */
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msg[0].flags = 0; /* Write transaction, beginning with START */
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msg[0].buffer = ®addr; /* Transfer from this address */
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msg[0].length = 1; /* Send one byte following the address
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* (no STOP) */
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/* Set up the 8-bit ADXL345 data read message */
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msg[1].frequency = priv->config->frequency; /* I2C frequency */
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msg[1].addr = priv->config->address; /* 7-bit address */
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msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
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msg[1].buffer = rxbuffer; /* Transfer to this address */
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msg[1].length = 2; /* Receive two bytes following the address
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* (then STOP) */
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/* Perform the transfer */
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ret = I2C_TRANSFER(priv->i2c, msg, 2);
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if (ret < 0)
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{
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snerr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return 0;
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}
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#ifdef CONFIG_ADXL345_REGDEBUG
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_err("%02x->%02x%02x\n", regaddr, rxbuffer[0], rxbuffer[1]);
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#endif
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return (uint16_t)rxbuffer[0] << 8 | (uint16_t)rxbuffer[1];
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}
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#endif
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#endif /* CONFIG_SENSORS_ADXL345 */
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