FT800Q-R datasheet(25/46 Pages) BRIDGETEK

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FT800 Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000039 Clearance No.: BRT#001

Figure 4-7 Touch screen connection

The host controls the TOUCH SCREEN ENGINE operation mode by writing the REG_TOUCH_MODE.

REG_TOUCH_MODE

Mode

Description

OFF

Acquisition stopped, only touch detection interrupt is still valid.

ONE-SHOT

Perform acquisition once every time MPU write '1' to

REG_TOUCH_MODE.

FRAME-SYNC

Perform acquisition for every frame sync (~60 data

acquisition/second.

CONTINUOUS

Perform acquisition continuously at approximately 1000 data

acquisition / second.

Table 4-14 Touch Controller Operating Mode

The Touch Screen Engine captures the raw X and Y coordinate and writes to register REG_TOUCH_RAW

XY. The range of these values is 0-1023. If the touch screen is not being pressed, both registers read

65535 (FFFFh).

These touch values are transformed into screen coordinates using the matrix in registers

REG_TOUCH_TRANSFORM_A-F.

The

post-transform

coordinates

are

available

REG_TOUCH_SCREEN_XY. If the touch screen is not being pressed, both registers read -32768 (8000h).

The values for REG TOUCH TRANSFORM A-F may be computed using an on-screen calibration process.

If the screen is being touched, the screen coordinates are looked up in the screen's tag buffer, delivering

a final 8-bit tag value, in REG TOUCH TAG. Because the tag lookup takes a full frame, and touch

coordinates change continuously, the original (x; y) used for the tag lookup is also available in

REG_TOUCH_TAG_XY.

Screen touch pressure is available in REG_TOUCH_RZ. The value is relative to the resistance of the touch

contact, a lower value indicates more pressure. The register defaults to 32767 when touch is not

detected. The REG_TOUCH_THRESHOLD can be set to accept a touch only when the force threshold is

exceeded.

Y+

Y-

X-

X+

FT800

X+

Y+

X-

Y-

LCD Touch Screen

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