FXLS8471Q datasheet(10/75 Pages) FREESCALE

10 / 75 page

FXLS8471Q

Sensors

Freescale Semiconductor, Inc.

3.4

FXLS8471Q Configuration function

This function configures the FXLS8471Q for a 200-Hz ODR

. The code is self-explanatory and can be easily customized for

different settings.

Example 5.

// function configures FXLS8471Q accelerometer sensor

static _mqx_int s_FXLS8471Q_start(MQX_FILE_PTR aFP)

{

uint8_t databyte;

// read and check the FXLS8471Q WHOAMI register

if (s_i2c_read_regs(aFP, FXLS8471Q_SLAVE_ADDR, FXLS8471Q_WHOAMI, &databyte,

(uint8_t) 1) != 1)

{

return (I2C_ERROR);

}

if (databyte != FXLS8471Q_WHOAMI_VAL)

{

return (I2C_ERROR);

}

// write 0000 0000 = 0x00 to accelerometer control register 1 to place FXLS8471Q into

// standby

// [7-1] = 0000 000

// [0]: active=0

databyte = 0x00;

if (s_i2c_write_regs(aFP, FXLS8471Q_SLAVE_ADDR, FXLS8471Q_CTRL_REG1, &databyte,

(uint8_t) 1) != 1)

{

return (I2C_ERROR);

}

// write 0000 0001= 0x01 to XYZ_DATA_CFG register

// [7]: reserved

// [6]: reserved

// [5]: reserved

// [4]: hpf_out=0

// [3]: reserved

// [2]: reserved

// [1-0]: fs=01 for accelerometer range of +/-4g with 0.488mg/LSB

databyte = 0x01;

if (s_i2c_write_regs(aFP, FXLS8471Q_SLAVE_ADDR, FXLS8471Q_XYZ_DATA_CFG,

&databyte, (uint8_t) 1) != 1)

{

return (I2C_ERROR);

}

// write 0001 0101b = 0x15 to accelerometer control register 1

// [7-6]: aslp_rate=00

// [5-3]: dr=010 for 200Hz data rate

// [2]: lnoise=1 for low noise mode

// [1]: f_read=0 for normal 16 bit reads

// [0]: active=1 to take the part out of standby and enable sampling

databyte = 0x15;

if (s_i2c_write_regs(aFP, FXLS8471Q_SLAVE_ADDR, FXLS8471Q_CTRL_REG1, &databyte,

(uint8_t) 1) != 1)

FXLS8471Q Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc

FXLS8471Q Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc

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