Carrol Touch Modular Flat Panel Specifications download pdf (Page 39)

Chapter 3 - General Programming Issues CARROLL TOUCH

3-10 Touch System Programmer’s Guide

receive a command or whether it is busy. Table 3-2 shows the values of

Bit 0 of the Status Register.

If Bit 0 of the Status Register is 0, you may send a command to the touch

controller by performing an I/O write to the Data Register (Base

Address). If Bit 0 of the Status Register is 1, do not send a touch

command to the touch controller.

Receiving Touch Data from the HBC

The procedure used to receive data from the HBC differs depending on

which communication mode you are using.

Polling Mode

When using polling mode, the application software polls the Status

Data Register (Base Address).

Before reading the Data Register, you must first perform an I/O read of

the Status Register. Bit 1 of the Status Register indicates whether there

is touch data available in the Data Register. Table 3-3 shows the values

of Bit 1 of the Status Register.

If Bit 1 of the Status Register is 0, you may receive a byte of touch data

by performing an I/O read of the Data Register. If Bit 1 of the Status

Table 3-2. Status Register Bit 0 Values

Bit 0 Description

0 Touch controller ready to receive command.

1 Touch controller busy.

Table 3-3. Status Register Bit 1 Values

Bit 1 Description

0 Touch data available.

1 No touch data available.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 273 274

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Carrol Touch Modular Flat Panel Specifications Page 39