Analog Devices Accelerometer Utilities

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Detailed Description

Functions for measuring acceleration using Analog Devices ADXL202.

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Files

• file adxl.h

Data Structures

• struct ADXL_CalibrationInfo_t

Defines

• #define ADXL_TIMERTICKS_MAX
• #define ADXL_CALIBRATION_INITIAL_VALUE

Typedefs

• typedef uint16_t ADXL_TimerTicks_t
• typedef int16_t ADXL_g_t

Functions

• void ADXL_SetCalibrationInfo (const ADXL_CalibrationInfo_t *const info_p)
• void ADXL_ResetMeasuredCalibrationInfo (void)
• const ADXL_CalibrationInfo_t * ADXL_GetMeasuredCalibrationInfo (void)
• void ADXL_PowerOn (void)
• unsigned char ADXL_MeasurementAvailable (void)
• ADXL_g_t ADXL_GetX (void)
• ADXL_g_t ADXL_GetY (void)
• ADXL_TimerTicks_t ADXL_GetAverage (void)
• void ADXL_PowerOff (void)

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Define Documentation

#define ADXL_TIMERTICKS_MAX

Max ticks.

#define ADXL_CALIBRATION_INITIAL_VALUE

Uncalibrated EEPROM ADXL_CalibrationInfo_t settings.

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Typedef Documentation

typedef uint16_t ADXL_TimerTicks_t

Timer ticks counter from ADXL202.

typedef int16_t ADXL_g_t

deci milli g. +10000dmg = +1g

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Function Documentation

void ADXL_SetCalibrationInfo (  const ADXL_CalibrationInfo_t *const  info_p  )

Set new calibration info Use this function to set calibration info read from EEPROM

void ADXL_ResetMeasuredCalibrationInfo (  void   )

Resets calibration info. Call this function before user start 360 degree +-1g calibration. Use ADXL_GetMeasuredCalibrationInfo to get calibration info when calibration is done. This resets the measured calibration info. When calibration is done ADXL_SetCalibrationInfo must be called for the new calibration to take affect. For example: ADXL_SetCalibrationInfo(ADXL_GetMeasuredCalibrationInfo());

const ADXL_CalibrationInfo_t* ADXL_GetMeasuredCalibrationInfo (  void   )

Get measure calibration info from ADXL library. Call this when user has subjected the accelerotmeter to +-1g on both axis. ADXL_ResetMeasuredCalibrationInfo must be called before calibration is started. Returns: The measured calibration info. Store this to NV memory (EEPROM).

void ADXL_PowerOn (  void   )

Start measuring acceleration See also: ADXL_MeasurementAvailable

unsigned char ADXL_MeasurementAvailable (  void   )

Returns != 0 if measurement is available

ADXL_g_t ADXL_GetX (  void   )

Get X-Axis value Returns: X-axis g-force in deci-milli-g. +1g is output as +10000. Note: ADXL must have correct calibration info

ADXL_g_t ADXL_GetY (  void   )

Get Y-axis value Returns: X-axis g-force in deci-milli-g. +1g is output as +10000. Note: ADXL must have correct calibration info

void ADXL_PowerOff (  void   )

Stop measure and power down all resources (ADXL, Timer1, Analog Compartor)

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