Agilent Technologies E1465A Manual do Utilizador descarregar pdf (Página 91)

Example: Reading

the Registers

(C/HP-UX)

This C/HP-UX programming example reads the Manufacturer ID Register,

Device Type Register and Status Register on the E1466A matrix module.

/***************************************************/

/****** readreg.c ******/

/**************************************************/

#include <sys/vxi.h> /*source file for controller VXI drivers*/

#include <fcntl.h>

#include <stdio.h>

#define logical_address 120 /*logical address of the matrix module*/

int fd;

typedef unsigned short word;

typedef struct dev_regs{ /*set up pointers*/

unsigned short id_reg;

unsigned short device_type;

unsigned short status_reg;

unsigned short bank0_channels;

} DEV_REGS;

main( )

{

/*open the controller VXI interface*/

fd=open("/dev/vxi/primary",O_RDWR);

if (fd){

perror("open");

exit(1);

}

/*retrieve the A16 pointers*/

dev=(struct dev_regs *)vxi_get_a16_addr(fd,logical_address);

/*sub to read the registers*/

read_reg(dev);

/*END of main program*/

}

/*SUB READ_REG*/

int read_reg(reg_ptr)

DEV_REGS *reg_ptr;

{

/*read the ID register*/

printf("\n ID Register = 0x%x\n",reg_ptr->id_reg);

/*read the Device Type register*/

printf("\n Device Type Register = 0x%x\n",reg_ptr->device_type);

/*read the Status register*/

printf("\n Status Register = 0x%x\n",reg_ptr->status_reg);

return;

}

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