AR1100 datasheet(21/58 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS41606B-page 21

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

5.0

COMMANDS

In normal operation, the AR1100 automatically returns

‘touch reports’ in response to a touch – no ‘prompting’

is required from the host. The following command set

can be used to configure the parameters used to

‘fine-tune’ the operation. To prevent touch reports from

interfering with these commands, it is recommended

that TOUCH_DISABLE be executed prior to any other

command(s) and the TOUCH_ENABLE command be

used as the last step to return the AR1100 to normal

operation.

5.1

Summary

Table 5-1 summarizes the standard command set.

Table 5-2 summarizes the STATUS byte in the

RESPONSE packet.

TABLE 5-1:

COMMAND SUMMARY

CMND

NAME

DESCRIPTION

0x12

TOUCH_ENABLE

Enable TOUCH reporting

0x13

TOUCH_DISABLE

Disable TOUCH reporting

0x14

CALIBRATE

Execute Calibrate routine

0x20

REG_READ

Read register(s)

0x21

REG_WRITE

Write register(s)

0x28

EE_READ

Read EE location(s)

0x29

EE_WRITE

Write EE location(s)

0x2B

EE_READ_PARAMS

Read parameter set (from EE to RAM)

0x23

EE_WRITE_PARAMS

Write parameter set (from RAM to EE)

TABLE 5-2:

STATUS SUMMARY

STATUS

NAME

DESCRIPTION

0x00

No error

0x01

UNRECOGNIZED

Unrecognized command

0x04

TIMEOUT

Packet time out

0x05

EEPARAMS_ERR

Error reading EEPROM parameters

0xFC

CAL_CANCEL

Calibration sequence cancelled

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