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nuttx/drivers/sensors/adxl345_i2c.c

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/****************************************************************************
* drivers/sensors/adxl345_i2c.c
*
* Copyright (C) 2014 Alan Carvalho de Assis. All rights reserved.
* Author: Alan Carvalho de Assis <acassis@gmail.com>
* Based on STME811 driver
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <unistd.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/sensors/adxl345.h>
#include "adxl345.h"
#if defined(CONFIG_SENSORS_ADXL345)
/****************************************************************************
* Name: adxl345_getreg8
*
* Description:
* Read from an 8-bit ADXL345 register
*
****************************************************************************/
#ifdef CONFIG_ADXL345_I2C
uint8_t adxl345_getreg8(FAR struct adxl345_dev_s *priv, uint8_t regaddr)
{
/* 8-bit data read sequence:
*
* Start - I2C_Write_Address - ADXL345_Reg_Address -
* Repeated_Start - I2C_Read_Address - ADXL345_Read_Data - STOP
*/
struct i2c_msg_s msg[2];
uint8_t regval;
int ret;
/* Setup 8-bit ADXL345 address write message */
msg[0].addr = priv->config->address; /* 7-bit address */
msg[0].flags = 0; /* Write transaction, beginning with START */
msg[0].buffer = &regaddr; /* Transfer from this address */
msg[0].length = 1; /* Send one byte following the address
* (no STOP) */
/* Set up the 8-bit ADXL345 data read message */
msg[1].addr = priv->config->address; /* 7-bit address */
msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
msg[1].buffer = &regval; /* Transfer to this address */
msg[1].length = 1; /* Receive one byte following the address
* (then STOP) */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
sndbg("I2C_TRANSFER failed: %d\n", ret);
return 0;
}
#ifdef CONFIG_ADXL345_REGDEBUG
dbg("%02x->%02x\n", regaddr, regval);
#endif
return regval;
}
#endif
/****************************************************************************
* Name: adxl345_putreg8
*
* Description:
* Write a value to an 8-bit ADXL345 register
*
****************************************************************************/
#ifdef CONFIG_ADXL345_I2C
void adxl345_putreg8(FAR struct adxl345_dev_s *priv,
uint8_t regaddr, uint8_t regval)
{
/* 8-bit data read sequence:
*
* Start - I2C_Write_Address - ADXL345_Reg_Address - ADXL345_Write_Data - STOP
*/
struct i2c_msg_s msg;
uint8_t txbuffer[2];
int ret;
#ifdef CONFIG_ADXL345_REGDEBUG
dbg("%02x<-%02x\n", regaddr, regval);
#endif
/* Setup to the data to be transferred. Two bytes: The ADXL345 register
* address followed by one byte of data.
*/
txbuffer[0] = regaddr;
txbuffer[1] = regval;
/* Setup 8-bit ADXL345 address write message */
msg.addr = priv->config->address; /* 7-bit address */
msg.flags = 0; /* Write transaction, beginning with START */
msg.buffer = txbuffer; /* Transfer from this address */
msg.length = 2; /* Send two byte following the address
* (then STOP) */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
sndbg("I2C_TRANSFER failed: %d\n", ret);
}
}
#endif
/****************************************************************************
* Name: adxl345_getreg16
*
* Description:
* Read 16-bits of data from an STMPE-11 register
*
****************************************************************************/
#ifdef CONFIG_ADXL345_I2C
uint16_t adxl345_getreg16(FAR struct adxl345_dev_s *priv, uint8_t regaddr)
{
/* 16-bit data read sequence:
*
* Start - I2C_Write_Address - ADXL345_Reg_Address -
* Repeated_Start - I2C_Read_Address - ADXL345_Read_Data_1 -
* ADXL345_Read_Data_2 - STOP
*/
struct i2c_msg_s msg[2];
uint8_t rxbuffer[2];
int ret;
/* Setup 8-bit ADXL345 address write message */
msg[0].addr = priv->config->address; /* 7-bit address */
msg[0].flags = 0; /* Write transaction, beginning with START */
msg[0].buffer = &regaddr; /* Transfer from this address */
msg[0].length = 1; /* Send one byte following the address
* (no STOP) */
/* Set up the 8-bit ADXL345 data read message */
msg[1].addr = priv->config->address; /* 7-bit address */
msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
msg[1].buffer = rxbuffer; /* Transfer to this address */
msg[1].length = 2; /* Receive two bytes following the address
* (then STOP) */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
sndbg("I2C_TRANSFER failed: %d\n", ret);
return 0;
}
#ifdef CONFIG_ADXL345_REGDEBUG
dbg("%02x->%02x%02x\n", regaddr, rxbuffer[0], rxbuffer[1]);
#endif
return (uint16_t)rxbuffer[0] << 8 | (uint16_t)rxbuffer[1];
}
#endif
#endif /* CONFIG_SENSORS_ADXL345 */
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