AR1010-ISLASHML datasheet(36/70 Pages) MICROCHIP

36 / 70 page

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

DS41393B-page 36

Preliminary

 2009-2012 Microchip Technology Inc.

9.1.3

DISABLE TOUCH BEFORE

SENDING SUBSEQUENT

COMMANDS

The

AR1000

does

not

support

full

duplex

communications. It cannot send touch reports to the

host simultaneously with receiving commands from the

host.

Disable AR1000 touch reporting prior to sending any

other command(s), then re-enable touch reporting

when complete with executing other commands.

Send the DISABLE_TOUCH command.

Check for expected command response.

Send a desired command.

Check for expected command response.

Repeat at step 2 if another command is to be

sent.

Send the ENABLE_TOUCH command.

Check for expected command response.

9.1.4

CONFIRM COMMAND IS SENT

Confirm each command sent to the AR1000, prior to

issuing another command, to ensure it is executed.

This is accomplished by evaluating the AR1000

response to a command that has been sent to it.

Check for each of the following five conditions to be

met (See Table 9-4).

0x<> represents a value that is dependent on the com-

mand.

An error has occurred if no response is received at all

or if any of the above conditions are not met in the

response from the AR1000. If an error condition

occurs, delay for a period of ~50 ms then send the

same command again.

TABLE 9-4:

COMMAND RESPONSE ERROR CONDITIONS

Condition

Response Byte

Description

Header

Header 0x55 value is expected

Size

Size 0x<> value to match what is expected for command sent

Status

Status 0x00 “success” value is expected

Command ID 0x<> value to match what is expected (ID of sent command)

Data

5 to end

Data byte count to match what is expected for command sent

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