Owner's manual

KTD-S0003-C Page 33 Tri-Axis Accelerometer Example

pITX-SP Software Guide

7 Tri-Axis Accelerometer Example

The accelerometer is not available before hardware revision 3.0 (only the Plus variant). The sensor chip

ML8953 (OKI) based on a piezo-resistive sensing principle. Acceleration measurement range: ±3g.

#include <dos.h>

#include <stdio.h>

#include <conio.h>

#include <stdlib.h>

#define ESC_CHAR 27

#define FALSE 0

#define TRUE 1

#define SMBUS_ENTRY 0xF8

#define DEVICE_ADDR 0x6E

#define SMBUS_READ_BYTE 0x00

#define SMBUS_WRITE_BYTE 0x01

#define INT_SERVICE 0x15

#define PAGE_REG 0x1E

#define OP_MODE_REG 0x03

#define STATUS_REG 0x01

#define XAXIS_REG 0x0A

#define YAXIS_REG 0x0C

#define ZAXIS_REG 0x0E

#define COMPOSITE_REG 0x10

#define PAGE0 0x00

#define PAGE1 0x01

#define START_MEASURE 0x08

typedef unsigned char byte;

typedef unsigned int word;

typedef unsigned long dword;

void WriteReg (byte reg, byte val)

{

union REGS regs;

regs.h.ah = SMBUS_ENTRY;

regs.h.al = SMBUS_WRITE_BYTE;

regs.h.bh = DEVICE_ADDR;

regs.h.bl = reg;

regs.h.cl = val;

int86 (INT_SERVICE, &regs, &regs);

}