Lanner LVC-5000(N4) Manual de usuario descargar pdf (Pagina 34)

Accessing the Digital Accelerometer

Appendix C

Embedded and Industrial Computing

Appendix C:

Accessing the Digital

Accelerometer Data from

the LVC-5000

The system employs Analog Devices’s ADXL345 Digital

Accelerometer which is a small, thin, ultralow power, 3-axis

accelerometer with high resolution (13-bit) measurement

at up to ±16 g. It interfaces with the LVC-5000 through a

SPI interface.

To access the Gsensor data, locate the adxl345_v001 folder

and execute the executable file adxl345 and it will show G

value of 3 axes.

Driver Installation

To access the G-Sensor data, use the following

instructions:

Make sure you already installed the Lanner GPIO 1.

driver on your LVC-5000 as instructed in Appendix B.

To access the Gsensor data, locate the adxl345_v001 2.

folder and execute the executable file adxl345 and it

will show G value of 3 axes.

A sample program in C:++

// main.cpp

// The adxl345.exe utility shows the 3 axis G value.

// History:

// 07/15/2011: Initial version

#include <winsock2.h>

#include <windows.h>

#include <stdio.h>

#include “ich7.h”

#include “adxl345.h”

void adxl345_init()

{

ich7_SM_WriteByte (0x1D, POWER_CTL, ACT_INACT_

SERIAL | MEASURE) ; // Power CTL:

Measure mode, Activity and Inactivity Serial

ich7_SM_WriteByte (0x1d, BW_RATE, RATE_100);

/ /

Output Data Rate: 100Hz

ich7_SM_WriteByte (0x1d, DATA_FORMAT, FULL_

RESOLUTION | DATA_JUST_LEFT | RANGE_16G);

/ /

Data Format: 16g range, right justified, 256->1g

}

int main(int argc, char* argv[])

{

adxl345_init () ;

while (1)

{

short x = (short) ich7_SM_ReadByte

(0x1d, DATAX1) << 8 | ich7_SM_ReadByte (0x1d,

DATAX0)<<0 ;

short y = (short) ich7_SM_ReadByte

(0x1d, DATAY1) << 8 | ich7_SM_ReadByte (0x1d,

DATAY0)<<0 ;

short z = (short) ich7_SM_ReadByte

(0x1d, DATAZ1) << 8 | ich7_SM_ReadByte (0x1d,

DATAZ0)<<0 ;

printf (“\rX=%.2f Y=%.2f Z=%.2f”, ((float)

x)/2048,((float)y)/2048,((float)z)/2048) ;

}

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Lanner LVC-5000(N4) Manual de usuario Pagina 34

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