Carrol Touch Modular Flat Panel Specifications download pdf (Page 38)

CARROLL TOUCH Chapter 3 - General Programming Issues

Touch System Programmer’s Guide 3-9

HBC I/O Registers

Overview

The HBC communicates with the PC through the PC bus via three

consecutive I/O registers. The base address of these I/O registers is set

by the I/O address jumpers on the HBC board, and may be set in

increments of 16 to any I/O address between 200H and 3F0H inclusive.

The three I/O registers are defined in Table 3-1.

The touch controller may be used in polling mode or in interrupt mode.

In polling mode, the application software must check the Status

application software must check the Status Register when sending data

to the touch controller, but may install an interrupt handler to receive

data from the touch controller. The interrupt number used is set by the

interrupt number jumpers on the HBC board, as described in the HBC

installation instructions. When using polling mode, set these jumpers to

none to prevent the HBC from generating any interrupts.

Sending a Touch Command to the HBC

The procedure used to send a touch command to the HBC is the same

for both interrupt mode and polling mode.

Before sending a command to the touch controller, you must first

perform an I/O read of the Status Register (Base Address + 1). Bit 0 of

the Status Register indicates whether the touch controller is ready to

Table 3-1. HBC I/O Registers

I/O Address Name

Read/

Write

Description

I/O Base

Address

Data Register R/W Used to send commands to

and receive reports from

the touch controller.

I/O Base

Address + 1

Status

R Used to check the touch

controller communications

status (i.e. ready to receive

commands, reports

available).

I/O Base

Address +2

Hardware

Reset Register

W Used to reset the touch

controller.

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Carrol Touch Modular Flat Panel Specifications Page 38

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