Kontron pITX-SP - Manual (Page 37)

KTD-S0003-C Page 33 Tri-Axis Accelerometer Example
p ITX-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
#include
#include
#include
#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, ®s, ®s);
}