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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o 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.
*
* o Neither the name of Freescale Semiconductor, Inc. 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 HOLDER 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.
*/
#include <stdint.h>
#include <stdbool.h>
#include "board.h"
#include "i2c_xfer.h"
#include "mpl3115.h"
#define MPL3115_MPERCOUNT 0.0000152587890625F // 1/65536 fixed range for MPL3115
#define MPL3115_CPERCPOUNT 0.00390625F // 1/256 fixed range for MPL3115
/*FUNCTION****************************************************************
*
* Function Name : mpl3115_init
* Returned Value : result
* Comments : Initialize MPL3115 pressure and temperature sensor.
*
*END*********************************************************************/
bool mpl3115_init(pressure_sensor_t* pThisPressure)
{
uint8_t txBuffer;
uint8_t cmdBuffer[2];
pThisPressure->fmPerCount = MPL3115_MPERCOUNT;
pThisPressure->fCPerCount = MPL3115_CPERCPOUNT;
/* Place the MPL3115 in Standby */
cmdBuffer[0] = MPL3115_ADDRESS << 1;
cmdBuffer[1] = MPL3115_CTRL_REG1;
txBuffer = 0x00;
if (!I2C_XFER_SendDataBlocking(cmdBuffer, 2, &txBuffer, 1))
return false;
/* Enable Data Flags in PT_DATA_CFG */
cmdBuffer[0] = MPL3115_ADDRESS << 1;
cmdBuffer[1] = MPL3115_PT_DATA_CFG;
txBuffer = 0x07;
if (!I2C_XFER_SendDataBlocking(cmdBuffer, 2, &txBuffer, 1))
return false;
// write 1011 1001 = 0xB9 to configure MPL3115 and enter Active mode
// [7]: ALT=1 for altitude measurements
// [6]: RAW=0 to disable raw measurements
// [5-3]: OS=111 for OS ratio=128 for maximum internal averaging with 512ms output interval
// [2]: RST=0 do not enter reset
// [1]: OST=0 do not initiate a reading
// [0]: SBYB=1 to enter active mode
cmdBuffer[0] = MPL3115_ADDRESS << 1;
cmdBuffer[1] = MPL3115_CTRL_REG1;
txBuffer = 0xB9;
if (!I2C_XFER_SendDataBlocking(cmdBuffer, 2, &txBuffer, 1))
return false;
return true;
}
/*FUNCTION****************************************************************
*
* Function Name : mpl3115_read_data
* Returned Value : result
* Comments : Get current height and temperature from mpl3115.
*
*END*********************************************************************/
bool mpl3115_read_data(pressure_sensor_t* pThisPressure)
{
uint8_t rxBuffer[5];
uint8_t cmdBuffer[3];
cmdBuffer[0] = MPL3115_ADDRESS << 1;
cmdBuffer[1] = MPL3115_OUT_P_MSB;
cmdBuffer[2] = (MPL3115_ADDRESS << 1) + 1;
if (!I2C_XFER_ReceiveDataBlocking(cmdBuffer, 3, rxBuffer, 5))
return false;
// place the read buffer into the 32 bit altitude and 16 bit temperature
pThisPressure->iHpFast = (rxBuffer[0] << 24) | (rxBuffer[1] << 16) | (rxBuffer[2] << 8);
pThisPressure->iTpFast = (rxBuffer[3] << 8) | rxBuffer[4];
return true;
}
/*******************************************************************************
* EOF
******************************************************************************/
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