HP 9000 Series 300 Istruzioni operative

Device

I/O

and User Interfacing

HP-UX Concepts and Tutorials

HP 9000 Series 300/800 Computers

Part

Number 97089-90057

FliOW

HEWLETT

a!e.

PACKARD

Hewlett-Packard Company

3404 East Harmony Road, Fort Collins, Colorado 80525

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This

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the

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September 1989

...

Edition

This edition supersedes manual

part

number

97089-90054.

The

current

edition contains all information previously contained

the

Device

I/O

and

the

Curses

and

Terminfo tutorials.

addition,

the

manual reflects

the

following changes:

• Examples in

the

Device

I/O

tutorial

have been

updated

reflect

changes for

the

7.0 release.

•

The

Curses

and

Terminfo

tutorial

now includes 16-bit

character

support.

•

The

NLS t.utorial has been removed

and

placed in a

separate

manual,

HP-UX

Native Language Support (97089-90058).

iii

Contents

Interfacing Concepts

Variation Between

Computer

Systems .

1-1

Manual Organization 1-2

DIL Interfacing Subroutines 1-3

Linking DIL

Routines.

1-3

Calling DIL Routines from Pascal 1-3

Calling DIL Routines from

FORTRAN

1-4

General Interface Concepts 1-5

Definition 1-5

Interface Functions 1-6

Handshake

I/O

. 1-7

Handshake

Output

1-7

Handshake

Input

1-7

HP-IB Protocol 1-8

The

-IB Interface 1-9

General

Structure

1-9

Handshake Lines 1-10

Bus Management Control Lines 1-13

ATN:

The

Attention Line 1-14

IFC:

The

Interface Clear Line 1-14

REN:

The

Remote Enable Line 1-14

EOI:

The

End

Identify

Line.

1-14

SRQ:

The

Service Request Line 1-15

The

GPIO

Interface 1-15

General-

Purpose

Routines

Background Basics 2-2

Interface Special Files . 2-2

Entity

Identifiers (eid) 2-2

Contents-1

Programming Model . . . . .

General-

Purpose

Routines . . .

Additional Series 300 Routines

Opening Interface Special

Files.

Closing Interface Special Files . .

Low-Level

Read/Write

Operations

Example

.........

Designing

Error

Checking Routines

The

errno Variable . . .

Using errno . . . . . .

The

errno.h Header File

Displaying

err

Error

Handlers .

Resetting Interfaces .

Locking

Interface

Controlling

I/O

Parameters

Setting

I/O

Timeout . .

Setting

Data

Path

Width

Setting Minimum

Data

Transfer

Rate

Setting

the

Read Termination

Pattern

Termination on

Byte

Count . . . .

Termination on Hardware Condition

Termination on

Data

Pattern

Disabling a Read Termination

Pattern

Determining Why a

Read

Terminated.

Example

...........

Interrupts

. . . . . . . . . . . . .

Series 300

and

800

Interrupt

Support

HP-IB

Interrupts

GPIO

Interrupts

io_on_interru

io_interrupt_ctl

Controlling the HP-IB Interface

Overview of HP-IB Commands

UNLISTEN

UNTALK

...

DEVICE

CLEAR

Contents-2

2-2

2-3

2-4

2-6

2-7

2-9

2-10

2-11

2-12

2-13

2-14

2-15

2-16

2-17

2-19

2-20

2-23

2-24

2-25

2-27

2-28

2-31

3-2

3-4

3-5

LOCAL LOCKOUT

SERIAL POLL ENABLE 3-5

SERIAL POLL DISABLE 3-5

TRIGGER

(Group Execute Trigger) 3-5

SELECTED DEVICE

CLEAR.

. 3-6

LOCAL . . . . . . . . 3-6

PARALLEL POLL CONFIGURE 3-6

PARALLEL POLL ENABLE 3-6

PARALLEL

POLL

DISABLE . 3-6

Overview of HP-IB DIL

Routines.

3-7

Standard

DIL Routines . . . 3-7

HP-IB:

The

Computer's Role 3-9

Ground Rules . . . . . . 3-9

Available Subroutines versus Controller Role . 3-9

Bus Citizenship: Surviving Multi-Device/Multi-Process

HP-IB . . . . . 3-11

io_lock

and

io_

unlock 3-12

io_burst . . . . . . 3-12

hpib_io . . . . . . 3-12

Opening

the

HP-IB Interface

File.

3-13

Sending HP-IB Commands 3-13

Errors While Sending Commands . 3-16

Changing

Parity

on Commands 3-17

Active Controller Role

.....

3-17

Determining Active Controller . 3-18

Setting Up Talkers

and

Listeners 3-19

Auto-Addressing . . . . . . 3-19

Using hpib_send_cmnd . . . 3-22

Calculating Talk

and

Listen Addresses 3-23

An Example Configuration 3-24

Remote Control of Devices 3-

Locking

Out

Local Control 3-25

Enabling Local Control 3-26

Triggering Devices

Transferring

Data

3-27

Data

Output.

. 3-27

Data

Input

3-29

Clearing

-IB Devices 3-30

Contents-3

Responding

Service Requests

Monitoring

the

SRQ Line . .

Processing

the

Service Request

Parallel

Polling.

. . . . . . .

Configuring Parallel Poll Responses

Disabling Parallel Poll Responses

Conducting a Parallel Poll . . . .

Errors During Parallel Polls . . .

Waiting For a Parallel Poll Response

Calculating

the

mask

Calculating

the

sense

Example

....

Serial Polling

...

Conducting a Serial Poll .

Errors During Serial Poll

Passing Control . . . . .

What

Control Is Not Accepted?

Errors While Passing Control

Controlling

the

ATN Line . . . . .

Changing

the

Interface Bus Address

System Controller Role . . . . .

Determining System Controller .

System Controller's Duties

hpib_abort

.......

hpib_ren_ctl . . . . . . . .

Errors During

hpib_abort

and

hpib_ren_ctl

The

Computer

As a Non-Active Controller

Checking Controller

Status

Requesting Service . . . . . . .

Errors While Requesting Service

Responding

Parallel Polls . . .

Calculating

the

Response . . .

Limitations of hpib_card_ppolLresp

Error

Conditions . . . . . .

hpib_ppolLresp_ctl.

. . . .

Disabling Parallel-Poll Response

Accepting Active Control . . .

Errors While Waiting on

Status

Contents-4

3-31

3-33

3-34

3-35

3-39

3-41

3-42

3-43

3-44

3-46

3-48

3-49

3-50

3-51

3-52

3-54

3-55

3-57

3-58

3-60

3-61

3-62

3-63

3-64

3-65

3-66

Determining When You Are Addressed . . . . . . .

Combining

I/O

Operations into a Single Subroutine Call

Iodetail:

The

I/O

Operation Template

The

Mode Component

The

Terminator Component

The

Count Component

The

Buf

Component

Allocating Space . . . .

Example

......

Locating

Errors

in Buffered

I/O

Operations

4. Controlling

the

GPIO Interface

Interface Configuration . . .

Creating

the

GPIO

Interface File

Interface Control Limitations

Using DIL Subroutines . . .

Resetting

the

Interface

Performing

Data

Transfers.

Using

Status

and

Control Lines

Driving CTLO

and

CTLI

Reading STIO

and

STll

. .

Controlling

Data

Path

Width

Controlling Transfer Speed

GPIO

Timeouts

Burst

Transfers

Read

Terminations . . . .

Determining Why a Read Operation Terminated

Specifying a Read Termination

Pattern

Interrupts

. . . . . . . . . . . . . . . . . .

A. Series 300 Dependencies

Location of

the

DIL Subroutines

Linking DIL Subroutines

The

GPIO

Interface

Data

Lines

...

Handshake Lines . . .

Special-

Purpose

Lines .

Data

Handshake Methods

3-67

3-72

3-73

3-75

3-76

3-77

3-79

4-1

4-2

4-3

4-4

4-5

4-6

4-7

4-8

4-9

A-I

A-2

A-3

Contents-5

Data-

Clock Source . . . . .

Creating

the

Interface Special File

Creating

the

Special File

pathname

major_number . . . .

minor_number . . . .

Creating

HP-IB Interface File

Creating a

GPIO

Interface

File.

Effects of Resetting (via io_reset) . .

Entity Identifiers . . . . . . . . .

Restrictions Using

the

DIL Subroutines

hpib_send_cmnd

hpib_status

io_reset . . .

io_speed_ctl .

io_timeout_ctl

Performance Tips

B. Series 800 Dependencies

Compiling Programs

That

Use DIL

Accessing

the

Interface Special Files

Major Numbers . . . . . . . .

Minor Numbers

and

Logical Unit Numbers

Listing Special Files

.........

Naming Conventions for Interface Special Files

Creating Interface Special

Files.

Hardware Effects on DIL Routines

hpib_rqst_srvce . . . . . . .

hpib_io

..........

hpib_atn_ctl, hpib-address_ctl, hpih_parity_ctl .

io_eoLctl .

io_reset . . .

io_speed_ctl .

io_timeout_ctl

io_width_ctl .

Return

Values for Special

Error

Conditions

DIL

Support

of HP-IB Auto-Addressed

Files.

hpib_card_ppolLresp . . . . . . . . . .

Contents-6

A-3

A-4

A-5

A-6

A-7

A-8

A-9

B-1

B-2

B-3

B-4

B-5

B-6

B-7

B-8

B-10

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