Filter
Top Products
1FC000
16
+ (40 * 64)
16
1FC000
16
+ A00
16
= 1FCA00
16
or decimal
2,080,768 + (40 * 64)
2,080,768 + 2560 = 2,083,328
Given the A16 base address and the "offset" of the Offset register (06
from Figure 3-12), the digitizer’s A24 base address can be
determined as shown in the program A24_READ.C.
/* A24_READ.C - This program reads the digitizer’s A24 base address. */
/* Include the following header files */
#include <stdio.h>
#include <cfunc.h> /* This file is from the HP-IB Command Library */
#define CMD_MOD 70900L /* I/O path between the digitizer and the Command Module */
/* Function prototypes */
long get_base_addr(void);
/****************************************************************************/
void main(void)
{
long base_addr;/* variable for digitizer A24 base address */
base_addr = get_base_addr();/* function call to calculate and */
/* return digitizer A24 base address */
printf("\nA24 base address = %ld", base_addr);
}
/****************************************************************************/
long get_base_addr(void)
{
/* base address of (A24) offset register in A16 address space */
long base_addr = (0x1FC000 + (40 * 64)) + 6; /* digitizer logical address is 40 */
Continued on Next Page
Chapter 3 Understandin
g
the HP E1429 Di
g
itizer 149