Touchscreen

Touchscreen Interface of LCD Graphic displays. More...

Structures
struct	TOUCH_STATE
	Touchscreen state. More...

Functions
int32_t	Touch_Initialize (void)
	Initialize touchscreen. More...
int32_t	Touch_Uninitialize (void)
	De-initialize touchscreen. More...
int32_t	Touch_GetState (TOUCH_STATE *pState)
	Get touchscreen state. More...

Description

Touchscreen Interface of LCD Graphic displays.

Many LCD Graphic displays provide a touchscreen controller which enables the user to interact directly with what is displayed. The Touchscreen Interface supports single-touch operation only.

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Data Structure Documentation

TOUCH_STATE

struct TOUCH_STATE

Touchscreen state.

Data Fields
uint8_t	padding
uint8_t	pressed	Pressed flag.
int16_t	x	Position X.
int16_t	y	Position Y.

Function Documentation

Touch_GetState()

int32_t Touch_GetState

(

TOUCH_STATE *

pState

)

Get touchscreen state.

Parameters

[out]

pState

pointer to TOUCH_STATE structure

Returns

• 0: function succeeded
• -1: function failed

The function reads the touchscreen state (x/y coordinates and pressed value) and writes the data into the structure TOUCH_STATE. The parameter pState is a pointer to the structure TOUCH_STATE. The function returns an integer value of 0 on success, and -1 on error.

Touch_Initialize()

int32_t Touch_Initialize

(

void

)

Initialize touchscreen.

Returns

• 0: function succeeded
• -1: function failed

The function initializes the touchscreen controller. The function returns an integer value of 0 on success, and -1 on error.

Touch_Uninitialize()

int32_t Touch_Uninitialize

(

void

)

De-initialize touchscreen.

Returns

• 0: function succeeded
• -1: function failed

The function de-initializes the touchscreen controller. The function returns an integer value of 0 on success, and -1 on error.